L7556, L7557 Low-Power SLICs
with Battery Switch
Data Sheet
January 2000
Description (continued)
CF1
BATTERY
SWITCH
POWER CONDITIONING
& REFERENCE
CF2
VREG
DCOUT
+
VITR
1 V/8 mA
–
SN
PT
PR
–
A = 4
SPARE
OP AMP
XMT
+
–
+
RCVN
RCVP
A = –4
B0
B1
BATTERY FEED
STATE CONTROL
dc RESISTANCE
ADJUST
DCR
+
–
LCTH
LOOP CLOSURE DETECTOR
NLC
RTSP
RTSN
+
–
NRDET
RGDET
RING TRIP DETECTOR
RING GROUND
DETECTOR
ICM
12-2551.a (F)
Figure 1. Functional Diagram
Lucent Technologies Inc.
3