AS2578B

AS2578 AMSCO | Alldatasheet

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Rev. 3 1 AS2578 /B March 1997 TELEPHONE CONTROLLER WITH

13 MEMORIES AND 2-WIRE BUS

❑ Low operating voltage ❑ Low current consumption, standby ≤ 0.1 µA ❑ Oscillator using Xtal or ceramic resonator (3.58 MHz) ❑ Serial interface to external EEPROM ❑ Consistent, simple and usable procedures ❑ The settings are programmed via the keyboard and stored in EEPROM or set by pin options Dialler: ❑ Data protection with 20 digit FIFO ❑ Sliding cursor protocol with comparison ❑ Automatic pause generation ❑ Temporary MF select via keyboard ❑ 30 digit LNR (Last Number Redial) ❑ 13 x 20 digit memory (RAM) on chip Tone Ringer: ❑ Ring frequency discrimination ❑ 3 tone melody with 4 different repetition rates ❑ Volume of melodies can be set in 4 steps Block Diagramme General Description The AS2578 /B are a versatile repertory LD/MF diallers with a melody generator, a ring frequency discriminator and a 2-wire interface to EEPROM. Together with the AS2520/1, the AS2578 /B form a coherent basis for a fully electronic telephone with a wide range of options. The AS2578 /B are especially designed to adapt to different PTT specifications. A RAM is on chip for last number redial, 3 direct dial and 10 numbers with abbreviated dialling. To allow easy use under a PABX, the device incorporates automatic pause insertion and sliding cursor procedure as selectable options (AS2578) or centrex keys (AS2578B). The device can be used with or without EEPROM as appropriate. When an EEPROM is connected, all RAM content is stored in the EEPROM by power loss. The circuit provides the possibility to set different modes of operation (LM codes) via the keyboard or via pin options, e.g. default signalling mode, automatic pause insertion, flash or ground loop and settings of volume and melodies. Austria Mikro Systeme International KEYSCAN HOOK STATE CONTROL DIAL DTMF MELODY SERIAL INTERFACE RING FREQUENCY DETECTOR POR OSCILLATOR REDIAL

13 X 20

1 X 30

• 0 1 3 R MUTE SET LNR

3.58 MHz

AP (AS2578 only) MV RR AS2578 /B Vss V DD MEM D C B A (AS2578B) Package Available in 28 pin DIP and PLCC.

Rev. 3 2 AS2578 /B March 1997 Pin Description Pin # Symbol Function 1C 4 Keyboard Columns 2C 3 3C 2 4C 1 5H S Hook Switch Input This input is active high with internal pull-down resistor.

6 MODE Signalling (LD/MF) Default Mode Select Input

High LD default mode, make/break pulse 33/66 ms Open MF only Low LD default mode, make/break pulse 40/60 ms 7C E Chip Enable Input This input is active high with internal pull-down resistor and is used to initiate setup procedures.

8 OSC2 Oscillator Input

9 OSC1 Oscillator Output

Oscillator pins for Xtal or ceramic resonator (3.58 MHz). When a ceramic resonator is used a capacitor (10 - 22 pF) must be connected from each of the oscillator pins to V SS .

10 Vss Negative Power Supply

11 TONE DTMF Tone Output

The dual tones provided at this output have a level independent of the supply voltage in the operating range from 2.5 to 5.5V.

13 SDA Serial Data I/O

SDA is a bidirectional pin with an open drain with internal pull-up resistor and is used to transfer data into and out of a compatible EEPROM.

14 SCL Serial Clock Line Output

The SCL output is an open drain with internal pull-up resistor and is used to clock data into and out of a compatible EEPROM.

15 FCI Frequency Comparator Input

Schmitt trigger input for ring frequency discrimination.

12 MO Melody Generator Output

Melodies for tone ringing are generated on this output. The output signal is PDM.

16 MUTE Mute Output

This push-pull output is high during dialling and when mute key has been activated, otherwise low.

17 MASK Mask Output

This push-pull output is high during pulsing (make and break periods). Continues…

Rev. 3 3 AS2578 /B March 1997 Pin Description cont´d Pin # Symbol Function

18 DPN Dial Pulse Output

This is the push-pull output for controlling the hook-switch transistor. It is low during on- hook and break periods and high during off-hook (see timing diagrammes).

19 GL Ground Loop Output

This push-pull output is high during ground loop 20 V DD Positive Power Supply

21 R4 Keyboard Rows

25 C5 Keyboard Column (AS2578)

This column is for the memory keys C6 Keyboard Column (AS2578B) This column is for centrex keys (A - D keys). Automatic pause insertion and Temporary MF select 1 are fixed enabled (AP open)

26 AP Access Pause Select Input (AS2578)

This input is used to select the automatic access pause insertion or sliding cursor (no centrex keys): AP pin Function High Sliding cursor enabled Temporary MF select 2 Open Automatic pause insertion enabled Temporary MF select 1 Low Sliding cursor and pause disabled Temporary MF select 1 C5 Keyboard Column (AS2578B) This column is for the memory keys

27 MV Melody Volume Select Input

This input is used to select the volume of the melodies in 4 steps by connecting the MV pin to row 1, 2, or 3. Leaving the pin open is the default setting (max. volume).

28 RR Repetition Rate Select Input

This input is used to select the repetition rate of the melodies. 4 different rates can be selected by either leaving the pin open (default) or connecting it to column 1, 2, or 3. Power On Reset The on chip power on reset circuit monitors the supply voltage (V DD ). As long as VDD remains below the internal reference voltage, Vref (typically 1.1V), the oscillator is inhibited. When V DD rises above Vref (tRISE = 1 µs/V to 50 ms/V), a reset signal is generated to assure correct start- up. Initial Setup A low to high transition on the CE input will initiate an automatic setup, i.e. the pin options are scanned and (when an EEPROM is connected) the stored LM codes and melody settings are read from the EEPROM. This is done independently of the hook state (see timing diagrammes). Note: "Open" means ≥ 100 kΩ .

Rev. 3 4 AS2578 /B March 1997 Memory Keys The keys M1 to M3 are direct memory access keys and the MEM key is used for abbreviated dialling. 13 numbers can be stored in on chip RAM. Each number can contain up to 20 digits (including pauses). If an EEPROM is connected to the serial bus, the content of the RAM is written into the EEPROM when CE is turned low indicating a power loss. During programming multible pauses can be inserted by pressing the LNR key. Memory dialling is cascadable. Mode Selection The default mode (LD or MF) can be selected by the MODE pin. Furthermore, the mode can be selected by setting the LM code (see setup menu). If no LM code is set, the mode will be determined by the MODE pin. When default LD mode is selected, a temporary change to MF mode can be invoked by pressing * (AP = high, AS2578 only) or Set, * , Set. When the circuit is in temporary MF mode, each of the following procedures revert it to default LD mode: - pressing Set, * , Set , - pressing recall key (by further entries of the recall key the signalling mode will toggle between MF and LD, - by next On-hook. Recall Function A recall activation will invoke a flash (timed loop break) or a ground loop (GL) depending on the selected LM code, which is stored in the external EEPROM (see setup menu). If no LM code is set, depressing the recall key will invoke both a flash and a GL, however, in LD mode a Flash is never executed. If recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are entered after the recall. If the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored, and subsequently entered digits will be stored in the LNR RAM as the new number. If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. Last Number Redial LNR is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable. The current contents of the RAM are overwritten by new entries. A manually entered number is automatically stored in the LNR RAM. The capacity of the RAM is 30 digits. If a number greater than 30 digits is entered, the LNR facility will be inhibited (until new entries < 31 digits) and further entries will be buffered in FIFO. Postdialled digits, i.e. digits manually entered after LNR has been invoked, are not stored in RAM but buffered in FIFO. Valid Keys The keyscanning is enabled when CE or HS are high. During setup the keyboard is disabled. A valid key is detected from the keyboard by connecting the appropriate row to the column. This can be done using an n x m keyboard matrix with single contacts. Positive and negative edges of each contact are debounced. The debounce time is 15 ms. Mute Key The mute key is only enabled when off-hook. Depressing the mute key activates and deactivates (toggle switch) the MUTE output, when internal mute is inactive, i.e. in speech mode. Any key entry overwrites a mute activated by the mute key, and mute will be deactivated. Centrex Keys (AS2578B only) The alphameric keys accommodate easy use of centrex services. The A, B, C and D keys are only valid in MF mode and are not storable. Pressing one of these keys will invoke the appropriate MF tones to be transmitted. The centrex keys are not stored in the RAM, but are buffered in the FIFO, and subsequently entered digits are also buffered in the FIFO. Pressing the recall key after a sequence including centrex keys will reset the RAM counter, and subsequently entered digits will be stored in the RAM. If MF select (Set, * , Set) has been invoked once, then all susequently digits/data will be buffered in the FIFO.

Rev. 3 5 AS2578 /B March 1997 After a recall a pause will automatically be generated. The pause time is 3 sec. The ground loop (GL) has two pulse lengths, namely a short of 500 ms and a long of 1250 ms. Short GL: If the recall key is depressed for ≤ 540 ms, the GL pulse is 500 ms. Long GL: If the recall key is depressed for > 540 ms, the GL pulse is 1250 ms. During redial a ground loop is only executed as a long GL (1250 ms). Pause Generation Pause introduces a delay in signalling digit strings to accommodate second and subsequent dial tones. Automatic pauses are generated in the following manner: - always after a recall independent of the AP pin - with automatic pause insertion enabled by pin option or LM code, up to two pauses can be automatically inserted at any location of the original entry in the RAM (except location 1 of the digit string), when the mute output goes inactive (in MF mode for more than 1 sec.) before next entry. A pause read from the RAM can be terminated (shortened) prior to time out by a low level on AP pin (AS2578 only) during the pause execution. The pause time is 3 sec. During execution of a pause, mute is inactive, i.e. the circuit is in speech mode. Sliding Cursor Procedure (AS2578 only) To accommodate redialling (LNR) behind a PABX without using automatic pause generation, a sliding cursor protocol is implemented. The sliding cursor is enabled when AP = high. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. Serial Interface The AS2578 /B support a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The AS2578 /B are controlling the transfer and hence the master. The EEPROM being controlled is the slave. The AS2578 /B will always initiate data transfer, and provide the clock for both transmit and receive operations. Therefore, the protocol is for single master applications only. However, a temporary second master can be used to write into the EEPROM when the AS2578 /B are supplied and in idle state. Clock and Data Conventions Data states on the SDA line can change only during SCL low. SDA state changes during SCL high are reserved for indicating start and stop conditions (see figure 1 and 2). Start Condition All commands are preceded by the start condition, which is a high to low transition of SDA when SCL is high. The slave should continuously monitor the SDA and SCL lines for the start condition and must not respond to any command until this condition has been met. Stop Condition All communications are terminated by a stop condition, which is low to high transition of SDA when SCL is high. The stop condition is also used to place the slave in the standby power mode. Acknowledge Acknowledge is a software convention used to indicate successful data transfers. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle the receiver will pull the SDA line low to acknowledge that it received the eight bits of data (see figure 3). The slave should always respond with an acknowledge after recognition of a start condition and its slave address. If both the device and a write operation have been selected, the slave should respond with an acknowledge after receipt of each subsequent eight bit word. In the read mode, when the EEPROM has transmitted eight bits of data, it should release the SDA line and monitor the line for an acknowledge. If the AS2578 /B respond with an acknowledge and does not generate a stop condition, the EEPROM should continue to transmit data. If the AS2578 /B do not respond with an acknowledge, the EEPROM should terminate further

Rev. 3 7 AS2578 /B March 1997 LM Codes and Pin Options LM code Pin option Function 02-2* AP = L Automatic pause insertion: off Sliding cursor: off MF select 1 02-3 AP = Hi-Z Automatic pause insertion: on Sliding cursor: off MF select 1 - AP = H Automatic pause insertion: off Sliding cursor: on MF select 2 033* MODE = L LD mode 40/60 GL 033* MODE = H LD mode 33/66 GL 036 - MF mode GL 037 - MF mode Flash - MODE = Hi-Z MF mode GL + Flash 250 - Resets all user settings to default and clears all RAM contents 258 - Clears all RAM contents 5 - 4* MV = Hi-Z Melody volume: 0 dB 5 - 3 MV = R3 Melody volume: - 5.5 dB 5 - 2 MV = R2 Melody volume: - 11.5 dB 5 -1 MV = R1 Melody volume: - 17.5 dB 6 - 1 RR = Hi-Z Repetition rate: 1 time (50 ms pause) 6 - 2* RR = C1 Repetition rate: 4 times 6 - 3 RR = C2 Repetition rate: 7 times 6 - 4 RR = C3 Repetition rate: 10 times Note 1: Programming an LM code overwrites pin options, however, LM code 033 can only be selected when the MODE pin is connected to either high or low for selecting the make/break ratio. Not valid LM codes are ignored. LM codes with a '*' are default settings. Note 2: When the AP pin is pulled low during execution of a pause, the pause will be terminated. Note 3: AP pin option not available on AS2578B.

Rev. 3 8 AS2578 /B March 1997 Operating Procedures Procedure Principles The procedures for utilizing the features of the AS2578 /B are optimized out of consideration for the human factor in order to: - meet the user´s expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesn´t expect - protect the user from committing critical errors, e.g. dialling wrong numbers, etc. - be consistent, simple and usable - meet the German 1 TR 2 and ETR 2 specifications. Idle (on-hook, no ringing) Speech mode Programming False programme entry Invalid entry TEXT State according to text Privacy mute Ringing KEY Going off-hook Going on-hook Pressing a key Entering a number Entry according to textTEXT 1590 Enter password X sec or Time out (x sec.) Dialling (LD or MF) Storing (writing into RAM or EEPROM) Processing according to text TEXT Melodies activated (ringing) = reading from memory States: Entries: Processing: Symbols

Rev. 3 9 AS2578 /B March 1997 Setup Procedures /LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines 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/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines /LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines S E T 5 or 6* Temporary MF Select Programming Melody ANY OTHER ENTRY /LiteDiagLines/LiteDiagLines /LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines 40 secS E T Exit programme state 1590 LN R Clear Procedures FALSE LN RANY OTHER ENTRY LM Codes 022 or 023 or 033 or 036 or 037 LM Code 250 LN R S E T 022, 023 executed. 033, 036, 037 buffered LN R S E T LM Code 258 LN R S E T ANY OTHER SEQUENCE LN R /LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines/LiteDiagLines /LiteDiagLines /LiteDiagLines /LiteDiagLines /LiteDiagLines /LiteDiagLines /LiteDiagLines LM Codes: 022 = no AP, no SC 023 = AP, no SC 033 = LD (MODE pin = VDD or Vss), GL 036 = MF, GL 037 = MF, FL 250 = Resets all settings to default, inhibits LNR and memories 258 = Inhibits LNR and memories Resets all settings to default 022, 023 executed. 033, 036, 037 buffered M 1-3 /LiteDiagLines/LiteDiagLines/LiteDiagLines /LiteDiagLines/LiteDiagLines/LiteDiagLines M E M Storing Direct Numbers Storing Indirect Numbers

Rev. 3 10 AS2578 /B March 1997 Clear Procedures SET 5 or 6 Temporary MF Select Programming Melody ANY OTHER ENTRY 40 secSET Exit programme state LNR ANY OTHER ENTRY LM Code 258 LNR SET ANY OTHER SEQUENCE LNR LM Codes: 258 = Inhibits LNR and memories 1590 Setup Procedures M1-3 MEM Storing Direct Numbers Storing Indirect Numbers

Rev. 3 11 AS2578 /B March 1997 Programming Melody SET 5 or 6 Temporary MF Select Setup Procedures Clear Procedure ANY OTHER ENTRY 40 secSET Exit programme state ANY OTHER ENTRY Key 1, 2, 3, or 4 SET LM Codes: (5) 1 = Melody volume - 17.5 dB (5) 2 = Melody volume - 11.1 dB (5) 3 = Melody volume - 5.5 dB (5) 4 = Melody volume 0 dB (default) (6) 1 = Repetition rate 1 (6) 2 = Repetition rate 4 (default) (6) 3 = Repetition rate 7 (6) 4 = Repetition rate 10 IGNORED Executing LM Code M1-3 MEM Storing Direct Numbers Storing Indirect Numbers

Rev. 3 12 AS2578 /B March 1997 Programming Volume of Melody During Ringing End of ringing ANY OTHER ENTRY Key 1, 2, 3, or 4 LM Codes: 1 = Volume - 17.5 dB 2 = Volume - 11.5 dB 3 = Volume - 5.5 dB 4 = Volume 0 dB (default) IGNORED Executing LM Code RINGING Only one change during a ringing phase!

Rev. 3 13 AS2578 /B March 1997 Temporary MF Select 1 (AP pin = open or low) Set, * , Set RAM FIFO Set, * , Set FIFO R FIFO 2 1 R D Set, * , Set FIFO EXIT FIFO Pressing any other key does not change the state.

Rev. 3 14 AS2578 /B March 1997 Temporary MF Select 2 (AS2578 only) (AP pin = high) RAM FIFO FIFO R FIFO 2 1 R D Set, * , Set FIFO EXIT FIFO Pressing any other key does not change the state. Set, * , Set Set, * , Set

Rev. 3 15 AS2578 /B March 1997 Automatic Dialling or M1-3 0 - 9 Postdialled digits are not stored but buffered in FIFO LNRMEM

Rev. 3 16 AS2578 /B March 1997 Storing Numbers SET 5 or 6 Temporary MF Select Programming Melody ANY OTHER ENTRY 40 secSET Exit programme state SET M1-3 Set Procedures MEM 0 - 9 M1-3 M1-3 MEM MEMM1-3 CLEARS SAID RAM MEMORY LOCATION CLEARS SAID RAM MEMORY LOCATION

Rev. 3 17 AS2578 /B March 1997 MUTE Privacy Mute

Rev. 3 19 AS2578 /B March 1997

Electrical Characteristics

Recommended Operating Conditions DC Characteristics (Default conditions: recommended operating conditions; outputs unloaded; VDD = 3.5V; AP and MODE = Vss; unless otherwise specified)) Symbol Parameter Conditions Min Typ Max Units I DD0 Standby Current HS = L; CE = L 0.1 µA IDD Standby Current HS = H; Osc. = 0 3.6 µA IDD Operating Current no tones 400 700 µA IDD Operating Current MF/melody 0.9 1.5 mA VIL Input Voltage, Low V SS 0.2 VDD V VIH Line Voltage, High 0.8 V DD VDD V IOL Output Current, Sink V OL = 0.4V 1.5 mA IOH Output Current, Source VOH = VDD - 0.4V 1 mA R HS Pull-down Resistor 1 M Ω R CE Pull-down Resistor 1 M Ω AC Charateristics (Default conditions: recommended operating conditions) Symbol Parameter Conditions Min Typ Max Units tS Clock Startup Time 5 ms tD Key Debounce Time 14.7 ms tHS HS Debounce Time 14.7 ms tSU Setup Time 100 ms Continues…

Rev. 3 20 AS2578 /B March 1997 AC Characteristics Cont´d Symbol Parameter Conditions Min Typ Max Units DTMF VMF MF Tone Level High group, R L = 15 kΩ -12.3 -10.8 -9.3 dBm ΔVL-H Preemphasis Low to High RL = 15 kΩ 2.0 2.4 2.8 dB THD Distortion (0.3 - 4 kHz) R L = 15 kΩ , note 3 -23 dBr tTD Tone Duration Note 1 80 82.3 85 ms tITP Inter Tone Pause Note 1 80 82.3 85 ms tTR Tone Rise Time Note 2 5 ms tTF Tone Fall Time Note 2 5 ms LD t DR Dial Rate ±5% 10 pps tM/B Make/Break Period ±5%, MODE = low 40.8/61.2 ms ±5%, MODE = high 33/66 ms tIDP Inter Digit Pause 800 840 880 ms tMO Mute Overhang t M tFD Flash Duration 100 102 ms tGLS Ground Loop, Short R key ≤ 540 ms 495 500 505 ms tGLL Ground Loop, Long R key > 540 ms 1200 1250 1300 ms tAP Automatic Pause 2.9 3.0 3.1 sec Melody V MO Melody Output PDM tMD Melody Delay 10 ms F1 Frequency 1 770 800 830 Hz F2 Frequency 2 1025 1067 1110 Hz F3 Frequency 3 1280 1333 1385 Hz t DT Detection Time 80 85 ms tTO Detection Time-out note 4 ms fMIN Min. Detection Frequency 19 20 21 Hz fMAX Max. Detection Frequency 58 59 60 Hz Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. Note 2: The rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. Note 3: Relative to high group. Note 4: The FCI circuit is reset by POR and on-hook. After a reset the FCI circuit is in a standby state. A positive edge on FCI will start the 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring frequency is missing, the timer is reset. When a valid ring signal is present for ≥ 73 ms, the melody generator is started and is directly controlled by a valid signal from the FCI circuit. This condition will remain until a new reset.

Rev. 3 21 AS2578 /B March 1997 Pin Configurations AS2578 RR MV AP V DD TONE GL DP MASK MUTE HS MODE CE Vss OSC2 OSC1 SDA SCL FCI MO AS2578B RR MV V DD TONE GL DP MASK MUTE HS MODE CE Vss OSC2 OSC1 SDA SCL FCI MO HS MODE CE Vss OSC2 OSC1 GL V DD TONE RR MV SCL FCI MO MUTE MASK DP SDA AS2578B

28 Pin PLCC

28 Pin DIP

V DD TONE RR MV AP SCL FCI MO MUTE MASK DP SDA AS2578

Rev. 3 22 AS2578 /B March 1997 Ordering Information: Part Number Package Pin 25 Pin 26 AS2578 P 28 pin DIP C5 AP AS2578 N 28 pin PLCC C5 AP AS2578B P 28 pin DIP C6 C5 AS2578B N 28 pin PLCC C6 C5 Applications: For application support contact your local AMS sales office. Copyright  1995-7, Austria Mikro Systeme International AG, Schloss Premstätten, 8141 Unterpremstätten, Austria. Trademarks Registered . All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Austria Mikro Systeme reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Austria Mikro Systeme for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Austria Mikro Systeme for each application.