PSB21911 데이터 시트보기 (PDF) - Siemens AG

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PSB21911

ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE

Siemens AG 

PSB 21911

PSF 21911

Pin Definitions and Functions

1.5

Pin Definitions and Functions

The following tables group the pins according to their functions. They include pin name,

pin number, type and a brief description of the function.

Pin No.

Symbol

P-LCC-44 T-QFP64 Stand- µP

alone mode

I/O Function

Power Supply Pins

1, 2

7, 8, 12 VDDd VDDd

I

5

14

GNDa1 GNDa1 I

7, 8

18, 19 VDDa1 VDDa1 I

9

21

VREF VREF

O

13

26

VDDa2 VDDa2 I

16

30

GNDa2 GNDa2 I

23

41

GNDd GNDd I

5 V ± 5% digital supply voltage

0 V analog

5 V ± 5% analog supply voltage

VREF pin to buffer internally generated

voltage with capacitor 100 nF vs GND

5 V ± 5% analog supply voltage

0 V analog

0 V digital

Mode Selection Pins

3

10

TSP

CS

18

35

AUTO

RST

I Single Pulse Test Mode

For activation refer to table 3 on

page 27. When active, alternating

2.5 V pulses are issued in 1.5 ms

intervals. Tie to GND if not used.

I Chip Select

(Multiplexed, demultiplexed and serial

modes): Low active.

I Auto EOC Mode

Selection between auto- and

transparent mode for EOC channel

processing. (Automode = (1))

O Reset output

(Multiplexed, demultiplexed and serial

modes): Low active.

Semiconductor Group

13

11.97

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