ATTL7554BP データシートの表示（PDF） - Agere -> LSI Corporation

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ATTL7554BP

L7554 Low-Power SLIC

Agere -> LSI Corporation 

L7554 Low-Power SLIC

Pin Information

Data Sheet

March 1997

VCC

RCVP

RCVN

TXI

LCTH

VREG

DCOUT

VBAT

PR

6 5 4 3 2 1 44 43 42 41 40

7

39

8

38

9

37

10

36

11

35

12

L7554

34

13

33

14

32

15

31

16

30

17

29

18 19 20 21 22 23 24 25 26 27 28

FB1

SN

XMT

B1

B2

NLC

NRDET

RTSP

RTSN

PT

VTX

Figure 2. Pin Diagram (PLCC Chip)

12-2571 (C)

Table 1. Pin Descriptions

Pin Symbol Type

Description

3

IPROG

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

device.

8

VCC

— +5 V Power Supply.

9 RCVP

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

differential voltage on Tip and Ring.

10 RCVN

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

tial voltage on Tip and Ring.

11

TXI

— ac/dc Separation. Connect a 0.1 µF capacitor from this pin to VTX.

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

13

VREG

I Regulated Negative dc Battery Voltage. Can be connected to an external regulator.

Otherwise, connect to VBAT.

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

value of the differential Tip/Ring current.

15 VBAT — Battery Supply. Negative high-voltage power supply.

16 PR I/O Protected Ring. The output of the ring driver amplifier and input to loop sensing circuitry.

Connect to loop through overvoltage protection.

18 CF2 — Filter Capacitor 2. Connect a 0.1 µF capacitor from this pin to AGND.

19 CF1 — Filter Capacitor 1. Connect a 0.47 µF capacitor from this pin to pin CF2.

4

Lucent Technologies Inc.

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