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參數(shù)資料
| 型號： | L7554 |
| 英文描述： | L7554 Low-Power SLIC |
| 中文描述： | L7554低功耗用戶接口 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大小： | 486K |
| 代理商： | L7554 |
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4
Lucent Technologies Inc.
Data Sheet
March 1997
L7554 Low-Power SLIC
Pin Information
12-2571 (C)
Figure 2. Pin Diagram (PLCC Chip)
Table 1. Pin Descriptions
Pin
3
Symbol
I
PROG
Type
I
Description
Current-Limit Program Input.
device.
+5 V Power Supply.
Receive ac Signal Input (Noninverting).
differential voltage on Tip and Ring.
Receive ac Signal Input (Inverting).
tial voltage on Tip and Ring.
ac/dc Separation.
Connect a 0.1
Loop Closure Threshold Input.
Regulated Negative dc Battery Voltage.
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
μ
F capacitor from this pin to AGND.
Filter Capacitor 1.
Connect a 0.47
μ
F capacitor from this pin to pin CF2.
A resistor to DCOUT sets the dc current limit of the
8
9
V
CC
—
I
RCVP
This high-impedance input controls the ac
10
RCVN
I
This high-impedance input controls the ac differen-
11
12
13
TXI
LCTH
V
REG
—
I
I
μ
F capacitor from this pin to VTX
Connect a resistor to DCOUT to set off-hook threshold.
Can be connected to an external regulator.
.
BAT
.
14
DCOUT
O
15
16
V
PR
BAT
—
I/O
18
19
CF2
CF1
—
—
I
P
NLC
NRDET
RTSP
RTSN
PT
RCVN
RCVP
V
CC
LCTH
V
REG
DCOUT
V
BAT
PR
B
D
A
A
B
I
C
V
C
C
7
9
10
11
12
13
14
15
16
17
8
6
4
3
2
1
44
43
42
41
40
5
18
20
21
22
23
24
25
26
27
28
19
39
37
36
35
34
33
32
31
30
29
38
F
B2
VTX
TXI
B1
XMT
SN
FB1
L7554
G
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