MH8981D Ver la hoja de datos (PDF) - Mitel Networks
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MH8981D Datasheet PDF : 15 Pages
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ISO-CMOS MT8981D
Pin Description (continued)
Pin #
Name
40 44 44
DIP PLCC QFP
Description
12 14 8
C4i 4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling
edges of this clock.
13- 15- 9-11 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the
15 17
microprocessor interface.
16- 19- 13- A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the
18 21 15
microprocessor interface
19 22 16
DS Data Strobe (Input). This is the input for the active high data strobe on the
microprocessor interface.
20 23 17 R/W Read or Write (Input). This is the input for the read/write signal on the
microprocessor interface - high for read, low for write.
21 24 18
CS Chip Select (Input). This is the input for the active low chip select on the
microprocessor interface.
22- 25- 19- D7-D5 Data 7 to 5 (Three-state I/O Pins). These are the bidirectional data pins on the
24 27 21
microprocessor interface.
25- 29- 23- D4-D0 Data 4 to 0 (Three-state I/O Pins). These are the bidirectional data pins on the
29 33 27
microprocessor interface.
30 34 28
31- 35- 29-
34 38 32
VSS Power Input. Negative Supply (Ground).
IC Internal Connections. Leave pins disconnected.
35 39 33 STo3 ST-BUS Output 3 (Three-state Outputs). These are the pins for the four 2048 kbit/s
ST-BUS output streams.
36- 41- 35- STo2- ST-BUS Output 2 to 0 (Three-state Outputs). These are the pins for the four 2048
38 43 37 STo0 kbit/s ST-BUS output streams.
39 44 38 ODE Output Drive Enable (Input). If this input is held high, the STo0-STo3 output drivers
function normally. If this input is low, the STo0-STo3 output drivers go into their high
impedance state. NB: Even when ODE is high, channels on the STo0-STo3 outputs
can go high impedance under software control.
40 1 39 IC Internal Connection. Leave pin disconnected.
2-19
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