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

Pin No.

Symbol

I/O Function

P-LCC-44 T-QFP64 Stand- µP

alone mode

ALE

I Address Latch Enable

(Demultiplexed mode): ALE tied to

GND selects the Siemens/Intel type.

ALE tied to VDD selects the Motorola

type.

CCLK I

Controller Data Clock

(Serial mode): Shifts data from (1) and

to (0) the device.

32

54

CLS CLS

O Clock Signal

A 7.68MHz clock, synchronous to the

U-interface, is provided on this pin.

12

24

PMOD PMODE I Processor Interface Enable

E

(PD) Setting PMODE to “1“ enables the

Processor Interface. Tie to GND or do

not connect to select stand-alone

mode. Internal pull down.

34

57

MTO

I Monitor Procedure Time-Out

(PD) Disables the internal 6 ms Monitor

time-out when set to (1). Internal pull-

down resistor.

RD

I Read

(Siemens/Intel multiplexed and

demultiplexed modes): indicates a

read operation, active low.

DS

I Data Strobe

(Motorola demultiplexed mode):

indicates a data transfer, active low.

not used I (Serial mode) tie to GND.

6, 9, 11,

15, 20, 25,

27, 31, 33,

34, 40, 48,

49, 50, 51,

63, 64

not

used

not used

Leave open for future compatibility.

Semiconductor Group

19

11.97

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