U3750BM

U3750BM TEMIC | Alldatasheet

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Features

/C0068Adjustable dc slope characteristic /C0068Adjustable automatic line length receiving and send- ing gain control (not used in DTMF) with the possibility of fixed gain (PABX) /C0068Adjustable dynamic impedance /C0068Stabilized power supply for peripherals /C0068Confidence level during pulse and DTMF dialling /C0068Receiving amplifier for dynamic or piezo-electric ear pieces /C0068High-impedance microphone inputs (80 k/C0087 in symmetrical and 40 k/C0087 in asymmetrical) suitable for dynamic, magnetic, piezo-electric or electret micro- phone /C0068Dynamic limiting in sending (anticlipping) prevents distortion of line signal and sidetone /C0068Ringing balanced output in HVMOS for higher power capability /C0068Four ringing tones adjustable without external components /C0068Internal speed up circuit permits a faster charge of V CC and VRAM capacitors /C0068Logic bounce elimination /C0068Pulse dialling 66/33 or 60/40 or DTMF dialling select- able by programming pin /C0068Adjustable flashing duration /C0068Pause function /C0068Confidence tone (440 Hz) /C0068Last number redial up to 23 digits /C0068Standard low-cost ceramic 455 kHz /C0068Binary data input in serial mode /C0068Test-mode capability Benefits /C0068Low number of external components /C0068High quality through one chip solution

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.19962 (20) Block Diagram

TELEFUNKEN Semiconductors U3750BM Rev. A1: 16.07.1996 3 (20) Pin Description Pin Symbol Function

1 C4 Keyboard input

2 C3 Keyboard input

3 FLASH Flashing selection

4 DC/FV Dialling selection (33/66 pulse,

40/60 pulse or DTMF)

5 OL Open line output

6 RESET Output reset

7 TEEIN Test pins

8 SHEN Test pins

9 NC Not connected

10 V RAM RAM and internal logic supply

11 V CC Power supply for peripherals

12 V L Line voltage

13 OSCAB Test pin

14 EC Extra current for peripherals or

can be used to dissipate power for high line current applications.

15 TESTR Test pin

16 GND Ground

17 NC Not connected

18 AGA Line length AGC adjustment

19 IREF Bias adjustment

20 SELF Electronic self input

21 RGAB DC characteristic slope

22 MIC 1 Microphone input

23 MIC 2 Microphone input

24 ZAC Dynamic impedance adjustment

25 EM/FILT First sending stage output

26 MOD Modulator output

27 EM/MF Second sending stage input and

28 ACL Anticlipping time constant

29 E2 Receiver output

30 E1 Receiver output

31 NC Not connected

32 REC Receiver input

33 ZAL Sidetone network

34 OUT1 Buzzer output

35 OUT2 Buzzer output

36 VIR Ringing supply

37 CK Ceramic input (455 KHz)

38 PAIR Adjustment between two pairs of

39 BEAT Beat adjustment of each pair of

40 MF DTMF output

41 C1 Keyboard inputs

42 C2 Keyboard inputs

43 C6 Keyboard inputs

44 C5 Keyboard inputs

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.19964 (20) Application Circuit Absolute Maximum Ratings See application circuit Parameters Symbol Value Unit DC line voltage Pin 36 VIR 35 V DC line current Pin 36 IR 30 mA Conversation line voltage Pin 12 V L 15 V Pulse duration, t = 20 ms V L 17 V Conversation line current Pin 12 IL 150 mA Power dissipation, Tamb = 55°C Ptot 1 W Junction temperature Tj 125 °C Ambient temperature range Tamb –25 to +55 °C Storage temperature range Tstg –55 to +155 °C

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.199610 (20) Electrical Characteristics of Logical Part fclock = 455 kHz (other specifications as under electrical characteristics) Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit V RAM Speed-up off threshold Speed-up on threshold Logic operating voltage in normal mode IL = 8 mA IL = 15 to 70 mA V SOFF V SON 2.4 1.9 2.75 2.2 2.5 3.5 2.9 2.3 V V V V IRAM Oscillator on Leakage V RAM = 3.5 V 800 300 /C0109A /C0109A Inputs: C1, C2, C3, C4, C5, C6, DC/FV , FLASH Input voltage low, VIL Input voltage high, VIH 0.8 V RAM 0.2 V RAM V V Keyboard pins: C1, C2, C3, C4, C5, C6 Internal pull down Output current V IL = 3.5 V V IH = 0 V 0.8 2.5 /C0109A /C0109A FLASH, DC/FV Internal pull-up current IPV Leakage current V IL = 0 V V IH = 3.5 V 0.5 5 /C0109A /C0109/C0065 Timing and frequency Reset time t r (see figure 6 and 7) Clock start-up time t on Time line break generating a reset: tlb Debounce time, te In mode 60/40 In mode 66/33 and DTMF mode In mode 60/40 In mode 66/33 and DTMF mode In mode 60/40 In mode 66/33 and DTMF mode 290 319 15.4 26.4 300 330 37.4 ms ms ms ms ms ms ms RESET output (with 390 /C0087 series) Output low current Output high current V OL = 2.5 V V OL = 0.5 V IOL IOH 0.25 0.25 1.2 1.2 mA mA OL output Output low current Output high current V OL = 0.5 V IOL IOH /C0109A mA MF output High impedance V OHI = 1.4 V FL = L, FH = H, VOH = 3.5 V FB = L, FH = H, VOH = 0 V FB = H, FH = L, VOH = 3.5 V FB = H, FH = L, VOH = 0 V 150 200 200 150 0.5 350 550 550 350 /C0109A /C0109A /C0109A /C0109A /C0109A CK Input Low input leakage High input leakage V IL = 0.5 V V IL = 3.0 V /C0109A /C0109A

TELEFUNKEN Semiconductors U3750BM Rev. A1: 16.07.1996 11 (20) UnitMax.Typ.Min.SymbolTest Conditions / PinsParameters Serial bus (see figure 12) Pulse width clock Pulse width enable signal Set-up time data to clock Hold time data from clock Enable time Time between two trans- missions twl, twh tel, teh tset up te tRRN 100 900 /C0109s /C0109s /C0109s /C0109s /C0109s /C0109s Pulse dialing (OL) Dialing pulse frequency Dialing pulse period Break time Make time Interdigit time Transmission mute: t mol = (tm + tb) /C0064 n + tm1 n pulses dialling In mode 60/40 (Pin 4 tied to RESET) In mode 66/33 (Pin 4 not connected) TOL tb tm tIDOL 830 813 [n/C0064100 + 30] [n/C006498.8 + 22] 10.11 100 98.9 833 816.5 (n/C0064100) + 32 (n/C006498.9) + 24.2 Hz Hz ms ms ms ms ms ms ms ms ms ms Flash pulse Flash pulse duration Transmission mute Pin 3 to GND Pin 4 to RESET Pin 3 to GND Pin 4 to NC Pin 3 to GND Pin 4 to GND Pin 3 to NC Pin 4 to RESET Pin 3 to NC Pin 4 to NC Pin 3 to NC Pin 4 to GND Pin 3 to RESET Pin 4 to RE- SET Pin 3 to RESET Pin 4 to NC Pin 3 to RESET Pin 4 to GND In mode 60/40 In mode 66/33 In mode DTMF tfl tmfl 89.5 98.5 102.5 239.5 263.5 274.0 109.5 120.5 125.0 830 813 846 101 105 242 266 277 112 123 128 832 815.5 848.5 ms Pause time In mode 60/40 In mode 66/33 In DTMF mode Tp 3116 3075 3012 3118 3077 3110 ms

TELEFUNKEN Semiconductors U3750BM Rev. A1: 16.07.1996 13 (20) Table 2 The scanning principle Keyboard clock 2 ms 2.2 ms Ti except T0, T1, T7 2 ms 2.2 ms T1 1.956 ms 2.156 ms T0 or T7 22 ms 22 ms Scanning cycle 12 ms 13.2 ms T0: reset of the logic keyboard T7: acquisition of the code present at the keyboard Scanning Push button Figure 9 The scanning principle

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.199614 (20) Timing of a Push Button The information from a pressed push button or released push button is taken into account if it is still present during at least two sampling times, T7. Table 3 Timing of a push button Clock Keyboard 2 ms, 2.2 ms Min. Typ. Max. Unit Minimum time – push button on 14 15.4 26.4 37.4 ms ms Minimum time – push button off 24 26.4 26.4 37.4 ms ms The entries are debounced on both the leading and trailing edges for 34 ms or 37.4 ms according to the value of the keyboard clock, and so the time remains less than 40 ms. At this time the information can be processed. If the informa- tion is still present after more than 40 ms, it is only taken one time. Serial Bus The remote microcontroller is connected to the IC by 4 pins: C2, C3, C4, C5 (see figure 10). Figure 10 Connection of the microcontroller to the U3750BM C2 transmits the data, C3 the clock, C4 the enable signal, and C5 indicates the state of the dialer: C5 = 0, dialer is busy C5 = 1, dialer is free Data is serially shifted in a 5-bit register during the positive going transition of the clock pulse. The positive going transition of the enable signal validates the transmission.

TELEFUNKEN Semiconductors U3750BM Rev. A1: 16.07.1996 15 (20) Figure 11 Timing of the serial bus Code Entries Table 0 0 0 0 0 * 0 0 0 0 1 1 0 0 0 1 0 2 0 0 0 1 1 3 0 0 1 0 0 4 0 0 1 0 1 5 0 0 1 1 0 6 0 0 1 1 1 7 0 1 0 0 0 8 0 1 0 0 1 9 0 1 0 1 0 0 0 1 0 1 1 A 0 1 1 0 0 B 0 1 1 0 1 C 0 1 1 1 0 D 0 1 1 1 1 # 1 0 0 0 0 16 1 0 0 0 1 R flash 1 0 0 1 0 Redial 1 0 1 0 0 Confidence tone 1 0 1 0 1 Micro inhibition 1 0 1 1 0 Pause 1 0 1 1 1 23

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.199616 (20) Dialer The IC includes a dialing circuit for either pulse dialing or dual tone multifrequency dialing. The dialer transmits the codes decoded by the logic keyboard on the outputs OL and MF. Mode Selection The choice of dialing is made by the tri-state-level on the DC/FV Pin FV DC = Z pulse dialing in 66/33 ms FV DC tied to pin RESET pulse dialing in 60/40 ms FV DC = 0 DTMF dialing calibrated When the circuit is in pulse mode, it is possible to change over to DTMF dialing with the “*” key. The code “*” is sent in line. The circuit returns in pulse mode after a reset condition or after a flash pulse (see figure 14). Dialing Codes The dialing codes are the numeric keys 0 to 9, and the non numeric keys A, B, C, D, *, #. All are stored in RAM. The codes A, B, C and D can be only transmitted by the serial bus. In pulse dialing, the code #, B, C and D have no effect on the dialing. The code A is filtered and corresponds to eleven pulses. Dialing As soon as the code is detected by the logic keyboard and written in RAM, it can only be loaded in the dialer if the dialer is not occupied and a pause is not generated. Pulse Dialing The output which provides control signals for proper timing in pulse dialing is pin, OL. The dialling starts with a make time (see figure 12). Dual tone Multifrequency Dialing The output pin, MF, provides the multifrequency signal to transmit in line. This signal results from the sum of two frequency pulses modulated and requires a filter to com- pose a dual sine wave. The frequencies are chosen in a low group and a high group. Table 3 shows the frequency tolerance of the output tones for DTMF signalling. In manual dialing or in redial, output tone is timed with a fixed duration. Table 4 Frequency tolerance of the output tones for DTMF signaling Standard Frequency Tone Output Frequency Frequency Deviation Hz Hz % Hz Low Group 697 770 852 941 697.8 768.6 848.9 940.1 +0.12 –0.18 –0.37 –0.10 +0.85 –1.42 –3.12 –0.92 High Group 1209 1336 1477 1633 1210.1 1338.2 1477.3 1636.7 +0.09 +0.17 +0.02 +0.22 +1.11 +2.23 +0.27 +3.69 Tone output frequency when using a 455 kHz ceramic.

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.199618 (20) Flash Control Detecting a “R” code produces either a short timed line break (< 200 ms ) or long timed line break (>200 ms) at the OL output. For the duration of the flash, it is not possible to take information from the keyboard. Flash signifies that the circuit executes a particular work as a dialing, a redial, or a pause function, and the code “R” is lost and not used. The flash pulse resets the read address counter and does not erase the data storage, so later redial is possible. The flash duration is programmed by the FLASH pin (Pin 3) and depends on the selection of the tri-state-level pin (Pin 4). Mutes (transmission mute and dialing mute) become active high from the beginning of the line break. Timings explains this. According to these timings and what has previously been said, a second pulse flash could only follow the first one 810 ms or 850 ms later. Consequently the “R” entry remains inhibited during a time less than 1 second. Pause Function A pause separates the dial sequence. It is used for waiting for a dial tone. A pause code takes one position in the RAM like a digit. However, if the circuit executes a pause and if another pause code is entered, the storage of the second one does not occur. Furthermore, the pause running is aborted. Duration of the pause is given in electrical characteristics for the following configuration: digit, pause, digit, and consequently takes into account the interdigit. Particular Functions After the reset, the particular functions are cleared. The state of the circuit is no confidence tone, no microphone inhibition. Confidence Tone Output When the data entries are derived from the serial bus, a pulse frequency modulation corresponding to a 440 Hz sine wave can be generated on the output MF by transmit- ting the confidence tone code which is 20 (in decimal). The function confidence tone is a flip-flop function. Microphone Inhibition Like the confidence tone, it is a flip flop function acti- vated through the serial bus by the code 21 (in decimal). RAM Organization The RAM is 32 words of 5 bits and is organized in two parts: one for the data storage and the other for the working RAM. Safeguard The safeguard is guaranteed by an external capacitor. If V RAM decreases under the data retention supply voltage, the redial function is forbidden. After the reset of the circuit, a test is executed on V RAM in order to ensure the redial validity. Data storage Storage, overflow and erasing are realized through three address counters. The written address counter (P1) points out the location where the code will be stored. At each storage, P1 is incremented by one. As each code is recalled from the RAM for line dialing, the read address counter (M1) is incremented by one to select the RAM location of the next code to be recalled. Consequently, the difference between the contents of P1 and of M1 represents the number of codes that have been written into the RAM but not yet converted into line dialing. The third counter (P2) gives the real capacity of the redial register. Redial features Capacity If more than 23 codes are entered into the RAM memory, overflow results and the excess codes replace the data in the lower numbered RAM locations. In this event, auto- matic redial is no longer possible. Storage Storage pertains to the dialing codes 0 to 9, *, #, pause, A, B, C and D. It is independent of the dialing mode (pulse dialing or DTMF dialing).The storage generally contains the last digits transmitted. Use of redial The use of redial is always possible except if the content of the RAM is empty (P2 = 0). This happens when the RAM supply is not high enough , when an overflow occurred, or when previously an erroneous use of the redial occurred (start of manual dialing not equal to the content of the RAM).

TELEFUNKEN Semiconductors U3750BM Rev. A1: 16.07.1996 19 (20) If the redial is ordered after a manual dialing the redial is executed according to the digits already transmitted in line. The redial is effective if the comparison digit-by-digit of all digits is correct. It is not produced if the comparison is incorrect or if the number of digits exceeded the last capacity of the redial. During redial, entry codes are accepted. Procedure with * Storage does not pertain to the “*” code and the codes entered after it when the manual dialing starts with a numeric code or A, B, C, D, #, or pause codes. If the dialing starts with the “*” code, all codes can be stored. Note: the “#” code is treated for storage like a number. Procedure with flash The flash pulse does not reset the content of the RAM. Example: 1 2 3 R Redial /C0181 /C0229 1 2 3 R 1 2 3 Redial /C0181 /C0229 1 2 3 Erasing redial The erasing is possible through the serial bus with the decimal codes 16 and 23. There is not much difference between these two codes: code 16 always erases the redial, code 23 inhibits a later redial if it is transmitted after or before dialing codes. The following examples illustrates this. Transmitted Codes On Line 1 2 3 Redial /C0181 16 1 2 3 –nothing 1 2 3 Redial /C0181 23 1 2 3 1 2 3 Redial /C0181 16 4 /C01811 2 3 4 1 2 3 Redial /C0181 23 4 /C01811 2 3 4 1 2 3 Redial /C0181 R 16 /C01811 2 3 R 1 2 3 Redial /C0181 R 23 /C01811 2 3 R 1 2 3 Special Case When the overflow flag is set and when the written address counter becomes equal to the read address counter, the codes are not stored. Dimensions in mm Package: PLCC 44

TELEFUNKEN SemiconductorsU3750BM Rev. A1: 16.07.199620 (20) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423