MT8815 MITEL | Alldatasheet

Document overview

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Technical content

Features

  • Internal control latches and address decoder
  • Short set-up and hold times
  • Wide operating voltage: 4.5V to 13.2V
  • 12Vpp analog signal capability
  • R ON 65Ω max. @ V DD =12V, 25°C
  • Δ R ON ≤ 10Ω @ V DD =12V, 25°C
  • Full CMOS switch for low distortion
  • Minimum feedthrough and crosstalk
  • Separate analog and digital reference supplies
  • Low power consumption ISO-CMOS technology

Applications

  • Key systems
  • PBX systems
  • Mobile radio
  • Test equipment /instrumentation
  • Analog/digital multiplexers
  • Audio/Video switching

Description

The Mitel MT8815 is fabricated in MITEL’s ISO- CMOS technology providing low power dissipation and high reliability. The device contains a 8 x 12 array of crosspoint switches along with a 7 to 96 line decoder and latch circuits. Any one of the 96 switches can be addressed by selecting the appropriate seven address bits. The selected switch can be turned on or off by applying a logical one or zero to the DATA input. V SS is the ground reference of the digital inputs. The range of the analog signal is from V DD to VEE .

Ordering Information

MT8815AC 40 Pin Ceramic DIP MT8815AE 40 Pin Plastic DIP MT8815AP 44 Pin PLCC -40° to 85°C Figure 1 - Functional Block Diagram 7 to 96 Decoder Latches 8 x 12 Switch Array STROBE DATA RESET VDD VEE VSS Xi I/O (i=0-11) Yi I/O (i=0-7) 9696 AX1 AY0 AY1 AY2 AX2 AX3 ISSUE 1 November 1988 ISO-CMOS MT8815 8 x 12 Analog Switch Array

Figure 2 - Pin Connections * Plastic DIP and CERDIP only. Pin Description Pin #* Name Description 1Y 3 Y3 Analog (Input/Output): this is connected to the Y3 column of the switch array. 2A Y 2 Y2 Address Line (Input). 3 RESET Master RESET (Input): this is used to turn off all switches. Active High. 4,5 AX3,AX0 X3 and X0 Address Lines (Inputs): these are used to select X3 and X0 rows of switches. 6,7 NC No Connection. 8-13 X6-X11 X6-X11 Analog (Inputs/Outputs): these are connected to the X6-X11 rows of the switch array.

14 NC No Connection

15 Y7 Y7 Analog (Input/Output): this is connected to the Y7 column of the switch array. 16 V SS Digital Ground Reference (Input). 17 Y6 Y6 Analog (Input/Output): this is connected to the Y6 column of the switch array. 18 STROBE STROBE (Input): enables function selected by address and data. Address must be stable before STROBE goes high and DATA must be stable on the falling edge of the STROBE. Active High. 19 Y5 Y5 Analog (Input/Output): this is connected to the Y5 column of the switch array. 20 V EE Negative Power Supply. 21 Y4 Y4 Analog (Input/Output): this is connected to the Y4 column of the switch array. 22, 23 AX1,AX2 X1 and X2 Address Lines (Inputs). 24, 25 AY0,AY1 Y0 and Y1 Address Lines (Inputs). 26, 27 NC No Connection. 28 - 33 X5-X0 X5-X0 Analog (Inputs/Outputs): these are connected to the X5-X0 rows of the switch array. 34 NC No Connection. 35 Y0 Y0 Analog (Input/Output): this is connected to the Y0 column of the switch array. 36 V DD Positive Power Supply. 37 Y1 Y1 Analog (Input/Output): this is connected to the Y1 column of the switch array.

38 DATA DATA (Input): a logic high input will turn on the selected switch and a logic low will turn off

the selected switch. Active High. 39 Y2 Y2 Analog (Input/Output): this is connected to the Y2 column of the switch array. 40 NC No Connection.

40 PIN CERDIP/PLASTIC DIP 44 PIN PLCC

2318 19 20 21 22 24 25 26 27 28 17 29 NC NC NC NC VDD DATA NC AY2 RESET AX3 AX0 NC

The MT8815 is an analog switch matrix with an array size of 8×12. The switch array is arranged such that there are 8 columns by 12 rows. The columns are referred to as the Y inputs/outputs and the rows are the X inputs/outputs. The crosspoint analog switch array will interconnect any X I/O with any Y I/O when turned on and provide a high degree of isolation when turned off. The control memory consists of a 96 bit write only RAM in which the bits are selected by the address inputs (AY0-AY2, AX0-AX3). Data is presented to the memory on the DATA input. Data is asynchronously written into memory whenever the STROBE input is high and is latched on the falling edge of STROBE. A logical “1” written into a memory cell turns the corresponding crosspoint switch on and a logical “0” turns the crosspoint off. Only the crosspoint switches corresponding to the addressed memory location are altered when data is written into memory. The remaining switches retain their previous states. Any combination of X and Y inputs/outputs can be interconnected by establishing appropriate patterns in the control memory. A logical “1” on the RESET input will asynchronously return all memory locations to logical “0” turning off all crosspoint switches. Two voltage reference pins SS and V EE ) are provided for the MT8815 to enable switching of negative analog signals. The range for digital signals is from V DD to VSS while the range for analog signals is from VDD to VEE . VSS and VEE pins can be tied together if a single voltage reference is needed. Address Decode The seven address inputs along with the STROBE are logically ANDed to form an enable signal for the resettable transparent latches. The DATA input is buffered and is used as the input to all latches. To write to a location, RESET must be low while the address and data are set up. Then the STROBE input is set high and then low causing the data to be latched. The data can be changed while STROBE is high, however, the corresponding switch will turn on and off in accordance with the DATA input. DATA must be stable on the falling edge of STROBE in order for correct data to be written to the latch.

  • Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. † DC Electrical Characteristics are over recommended temperature range. ‡ Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. Absolute Maximum Ratings*- Voltages are with respect to VEE unless otherwise stated. Parameter Symbol Min Max Units

1 Supply Voltage V DD

-0.3 -0.3 15.0 VDD +0.3 V V 2 Analog Input Voltage V INA -0.3 V DD +0.3 V 3 Digital Input Voltage V IN VSS -0.3 V DD +0.3 V

4 Current on any I/O Pin I ±15 mA

5 Storage Temperature T S -65 +150 °C

6 Package Power Dissipation PLASTIC DIP

0.6 1.0 W W Recommended Operating Conditions - Voltages are with respect to VEE unless otherwise stated. Characteristics Sym Min Typ Max Units Test Conditions

1 Operating Temperature T O -40 25 85 °C

2 Supply Voltage V DD

4.5 VEE 13.2 VDD -4.5 V V

3 Analog Input Voltage V INA VEE VDD V

4 Digital Input Voltage V IN VSS VDD V

Characteristics Sym Min Typ ‡ Max Units Test Conditions

1 Quiescent Supply Current I DD 11 0 0 µA All digital inputs at VIN=V SS or

0.4 1.5 mA All digital inputs at V IN=2.4V + VSS ; VSS =7.0V 5 15 mA All digital inputs at V IN=3.4V

2 Off-state Leakage Current

(See G.9 in Appendix) IOFF ±1 ±500 nA IV Xi - VYjI = VDD - VEE See Appendix, Fig. A.1 3 Input Logic “0” level V IL 0.8+VSS VV SS =7.5V; VEE =0V 4 Input Logic “1” level V IH 2.0+VSS VV SS =6.5V; VEE =0V 5 Input Logic “1” level V IH 3.3 V 6 Input Leakage (digital pins) ILEAK 0.1 10 µA All digital inputs at VIN = VSS or VDD Characteristics Sym 25°C 70°C 85°C Units Test Conditions Typ Max Typ Max Typ Max

1 On-state V DD =12V

Resistance VDD =10V VDD = 5V (See G.1, G.2, G.3 in Appendix) R ON 45 120 185 215 225 Ω Ω Ω VSS =V EE =0V,VDC =V DD /2, IVXi-VYjI = 0.4V See Appendix, Fig. A.2

2 Difference in on-state

(See G.4 in Appendix) Δ R ON 51 0 1 0 1 0 Ω VDD =12V, VSS =V EE =0, VDC =V DD /2, IVXi-VYjI = 0.4V See Appendix, Fig. A.2

† Timing is over recommended temperature range. See Fig. 3 for control and I/O timing details. ‡ Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. Crosstalk measurements are for Plastic DIPS only, crosstalk values for PLCC packages are approximately 5dB better. † Timing is over recommended temperature range. See Fig. 3 for control and I/O timing details. Digital Input rise time (tr) and fall time (tf) = 5ns. ‡ Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. ➀ Refer to Appendix, Fig. A.7 for test circuit. VEE =-7V, unless otherwise stated. Characteristics Sym Min Typ ‡ Max Units Test Conditions

1 Switch I/O Capacitance C S 20 pF f=1 MHz

2 Feedthrough Capacitance C F 0.2 pF f=1 MHz

3 Frequency Response

Channel “ON” 20LOG(V OUT /VXi)=-3dB F3dB 45 MHz Switch is “ON”; V INA = 2Vpp sinewave; RL = 1kΩ See Appendix, Fig. A.3

4 Total Harmonic Distortion

(See G.5, G.6 in Appendix) THD 0.01 % Switch is “ON”; V INA = 2Vpp sinewave f= 1kHz; R L=1kΩ

5 Feedthrough

Channel “OFF” Feed.=20LOG (VOUT /VXi) (See G.8 in Appendix) FDT -95 dB All Switches “OFF”; V INA= 2Vpp sinewave f= 1kHz; R L= 1kΩ . See Appendix, Fig. A.4

6 Crosstalk between any two

channels for switches Xi-Yi and Xj-Yj. Xtalk=20LOG (V Yj/VXi). (See G.7 in Appendix). Xtalk -45 dB V INA=2Vpp sinewave f= 10MHz; RL = 75Ω . -90 dB V INA=2Vpp sinewave f= 10kHz; RL = 600Ω . -85 dB V INA=2Vpp sinewave f= 10kHz; RL = 1kΩ . -80 dB V INA=2Vpp sinewave f= 1kHz; RL = 10kΩ . Refer to Appendix, Fig. A.5 for test circuit.

7 Propagation delay through

tPS 30 ns R L=1kΩ ; C L=50pF VEE =-7V, unless otherwise stated. Characteristics Sym Min Typ ‡ Max Units Test Conditions

1 Control Input crosstalk to switch

(for DATA, STROBE, Address) CX talk 30 mVpp V IN=3V squarewave; R IN=1kΩ , RL=10kΩ . See Appendix, Fig. A.6

2 Digital Input Capacitance C DI 10 pF f=1MHz

3 Switching Frequency F O 20 MHz

4 Setup Time DATA to STROBE t DS 10 ns R L= 1kΩ , C L=50pF ➀

5 Hold Time DATA to STROBE t DH 10 ns R L= 1kΩ , C L=50pF ➀

6 Setup Time Address to STROBE t AS 10 ns R L= 1kΩ , C L=50pF ➀

7 Hold Time Address to STROBE t AH 10 ns R L= 1kΩ , C L=50pF ➀

8 STROBE Pulse Width t SPW 20 ns R L= 1kΩ , C L=50pF ➀

9 RESET Pulse Width t RPW 40 ns R L= 1kΩ , C L=50pF ➀

10 STROBE to Switch Status Delay t S 40 100 ns R L= 1kΩ , C L=50pF ➀

11 DATA to Switch Status Delay t D 50 100 ns R L= 1kΩ , C L=50pF ➀

12 RESET to Switch Status Delay t R 35 100 ns R L= 1kΩ , C L=50pF ➀

Table 1. Address Decode Truth Table ➀ This address has no effect on device status.