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MT8981D Datasheet(PDF) 2 Page - Zarlink Semiconductor Inc |
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MT8981D Datasheet(HTML) 2 Page - Zarlink Semiconductor Inc |
2 / 17 page MT8981D ISO-CMOS 2-18 Figure 2 - Pin Connections Pin Description Pin # Name Description 40 DIP 44 PLCC 12 DTA Data Acknowledgement (Open Drain Output). This is the data acknowledgement on the microprocessor interface. This pin is pulled low to signal that the chip has processed the data. A 909 Ω, 1/4W, resistor is recommended to be used as a pullup. 2-4 3-5 STi0- STi2 ST-BUS Input 0 to 2 (Inputs). These are the inputs for the 2048 kbit/s ST-BUS input streams. 5 7 STi3 ST-BUS Input 3 (Input). These are the inputs for the 2048 kbit/s ST-BUS input streams. 6-9 8-11 IC Internal Connections. Must be connected to VDD. 10 12 VDD Power Input. Positive Supply. 11 13 F0i Framing 0-Type (Input). This is the input for the frame synchronization pulse for the 2048 kbit/s ST-BUS streams. A low on this input causes the internal counter to reset on the next negative transition of C4i. 12 14 C4i 4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling edges of this clock. 13- 15 15- 17 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the microprocessor interface. 16- 18 19- 21 A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the microprocessor interface 19 22 DS Data Strobe (Input). This is the input for the active high data strobe on the microprocessor interface. 20 23 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 CS Chip Select (Input). This is the input for the active low chip select on the microprocessor interface. 7 8 9 10 11 12 13 14 15 16 39 38 37 36 35 34 33 32 31 30 17 29 STi3 IC IC IC IC VDD F0i C4i A0 A1 A2 STo3 IC IC IC IC VSS D0 D1 D2 D3 D4 44 PIN PLCC DTA STi0 STi1 STi2 STi3 IC IC IC IC VDD F0i C4i A0 A1 A2 A3 A4 A5 DS IC ODE STo0 STo1 STo2 STo3 IC IC IC IC VSS D0 D1 D2 D3 D4 D5 D6 D7 CS 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 R/W 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 40 PIN PLASTIC DIP |
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