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參數(shù)資料
| 型號(hào)： | L7556 |
| 廠商： | Lineage Power |
| 英文描述： | Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開關(guān)的低功耗用戶環(huán)路接口電路（SLIC）) |
| 中文描述： | 低功耗SLIC組件（電子用戶環(huán)路接口電路）與電池開關(guān)（帶電池開關(guān)的低功耗用戶環(huán)路接口電路電路（SLIC）） |
| 文件頁數(shù)： | 4/28頁 |
| 文件大?。?/td> | 753K |
| 代理商： | L7556 |
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4
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Pin Information
12-2548.q (F)
Figure 2. Pin Diagram (PLCC Chip)
Table 1. Pin Descriptions
Pin
1
Symbol
V
BAT2
Type
—
Description
Auxiliary Battery Supply.
Negative high-voltage battery, lower in magnitude than
V
BAT1
, used to reduce power dissipation on short loops.
Current-Limit Program Input.
A resistor to DCOUT sets the dc current limit of the
device.
Battery Switch.
See Table 2 for description.
No Connection (L7556 Only).
Do not use as a tie point.
Lower Battery in Use (L7557 Only).
When high, this open-collector output indicates
the device has switched to V
BAT2.
To use, connect a 100 k
resistor to V
CC
.
+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 differ-
ential voltage on tip and ring.
Loop Closure Threshold Input.
Connect a resistor to DCOUT to set off-hook thresh-
old.
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, higher in magnitude than V
BAT2
.
2
I
PROG
I
3
4
4
BS
NC
L
BAT
I
—
O
5
6
V
CC
RCVP
—
I
7
RCVN
I
8
LCTH
I
9
DCOUT
O
10
V
BAT1
—
B1
XMT
NLC
NRDET
RTSP
RTSN
PT
5
7
8
9
10
11
12
1314
15
6
4
3
2
1
32
31
16
18
19
20
17
30
27
26
25
24
23
22
21
28
I
D
A
A
V
R
B
29
SN
BGND
I
P
RCVN
RCVP
V
CC
LCTH
V
BAT1
DCOUT
PR
CF2
CF1
N
32-PIN PLCC
B
B
V
B
B
N
L
B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L7557 | Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開關(guān)的低功耗用戶環(huán)路線接口電路（SLIC）) |
| L7581 | Ringing Access Switch(振鈴存取開關(guān)) |
| L7582 | Ring Access Switch(振鈴存取開關(guān)) |
| L7583B | Line Card Access Switch(線卡存取開關(guān)) |
| L7583C | Line Card Access Switch(線卡存取開關(guān)) |
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