ATTL7556AAU Просмотр технического описания (PDF) - Agere -> LSI Corporation

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ATTL7556AAU

Low-Power SLICs with Battery Switch

Agere -> LSI Corporation 

L7556, L7557 Low-Power SLICs

with Battery Switch

Pin Information

Data Sheet

January 2000

4 3 2 1 32 31 30

VCC 5

29 SN

RCVP 6

28 XMT

RCVN 7

27 B1

LCTH 8

DCOUT 9

32-PIN PLCC

26 NLC

25 NRDET

VBAT1 10

24 RTSP

PR 11

23 RTSN

CF2 12

22 PT

CF1 13 14 15 16 17 18 19 20 21 BGND

Figure 2. Pin Diagram (PLCC Chip)

12-2548.q (F)

Table 1. Pin Descriptions

Pin Symbol Type

Description

1

VBAT2 — Auxiliary Battery Supply. Negative high-voltage battery, lower in magnitude than

VBAT1, used to reduce power dissipation on short loops.

2

IPROG

I Current-Limit Program Input. A resistor to DCOUT sets the dc current limit of the

device.

3

BS

I Battery Switch. See Table 2 for description.

4

NC

— No Connection (L7556 Only). Do not use as a tie point.

4

LBAT O Lower Battery in Use (L7557 Only). When high, this open-collector output indicates

the device has switched to VBAT2. To use, connect a 100 kΩ resistor to VCC.

5

VCC

— +5 V Power Supply.

6 RCVP I Receive ac Signal Input (Noninverting). This high-impedance input controls the ac

differential voltage on tip and ring.

7 RCVN I Receive ac Signal Input (Inverting). This high-impedance input controls the ac differ-

ential voltage on tip and ring.

8 LCTH I Loop Closure Threshold Input. Connect a resistor to DCOUT to set off-hook thresh-

old.

9 DCOUT O dc Output Voltage. This output is a voltage that is directly proportional to the absolute

value of the differential tip/ring current.

10 VBAT1 — Battery Supply. Negative high-voltage power supply, higher in magnitude than VBAT2.

4

Lucent Technologies Inc.

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