ATTL7554BP Agere Systems, ATTL7554BP Datasheet - Page 4

• Manufacturer Part Number: ATTL7554BP
• Description: L7554 Low-Power SLIC
• Manufacturer: Agere Systems

L7554 Low-Power SLIC
Pin Information
Table 1. Pin Descriptions
4
Pin
10
11
12
13
14
15
16
18
19
3
8
9
Symbol Type
DCOUT
RCVP
RCVN
LCTH
I
V
V
CF2
CF1
PROG
V
TXI
PR
REG
BAT
CC
I/O
—
—
—
—
—
O
I
I
I
I
I
DCOUT
Current-Limit Program Input. A resistor to DCOUT sets the dc current limit of the
device.
+5 V Power Supply.
Receive ac Signal Input (Noninverting). This high-impedance input controls the ac
differential voltage on Tip and Ring.
Receive ac Signal Input (Inverting). This high-impedance input controls the ac differen-
tial voltage on Tip and Ring.
ac/dc Separation. Connect a 0.1 F capacitor from this pin to VTX.
Loop Closure Threshold Input. Connect a resistor to DCOUT to set off-hook threshold.
Regulated Negative dc Battery Voltage. Can be connected to an external regulator.
Otherwise, connect to V
dc Output Voltage. This output is a voltage that is directly proportional to the absolute
value of the differential Tip/Ring current.
Battery Supply. Negative high-voltage power supply.
Protected Ring. The output of the ring driver amplifier and input to loop sensing circuitry.
Connect to loop through overvoltage protection.
Filter Capacitor 2. Connect a 0.1 F capacitor from this pin to AGND.
Filter Capacitor 1. Connect a 0.47 F capacitor from this pin to pin CF2.
RCVP
RCVN
LCTH
V
V
V
REG
TXI
BAT
PR
CC
9
10
11
12
13
14
15
16
17
7
8
18
6
Figure 2. Pin Diagram (PLCC Chip)
19
5
20
4
21
3
BAT
.
22
2
L7554
23
1
44
24
43
25
Description
42
26
41
27
40
28
38
37
36
35
34
33
32
31
30
29
39
FB1
SN
XMT
B1
B2
NLC
NRDET
RTSP
RTSN
PT
VTX
Lucent Technologies Inc.
March 1997
Data Sheet
12-2571 (C)