STLC5444 Datasheet, PDF (1/17 Pages) STMicroelectronics – QUAD FEEDER POWER SUPPLY

STLC5444
QUAD FEEDER POWER SUPPLY
SUPPLIES POWER FOR UP TO FOUR DIGI-
TAL TELEPHONE LINES
CONFORMS TO THE CCITT RECOMMEN-
DATIONS FOR POWER FEED AT THE S OR
T REFERENCE POINTS
SUPPORTS POINT-TO-POINT AND POINT
TO MULTIPOINT CONFIGURATIONS
EACH OF THE FOUR LINES IS INDIVIDU-
ALLY CONTROLLED
HIGH-VOLTAGE BCD TECHNOLOGY SUP-
PORTING UP TO -130V
AUTOMATIC THERMAL SHUTDOWN
STATUS CONDITION DETECTION (BY MI-
CROPROCESSOR) FOR EACH LINE:
– Low output voltage
– Openloop
– Current overload
– Thermal overload
– Normal line condition
PROGRAMMABLE CURRENT LIMITING
OUTPUT CURRENT UP TO 120mA
DIP24
PLCC44
ORDERING NUMBERS: STLC5444B1 (DIP24)
STLC5444FN (PLCC44)
DIP24 PIN CONNECTION (Top view)
DESCRIPTION
The ISDN Quad Feeder Power Supply (IQFPS)
provides a power source for up to four line inter-
faces. The power source to the device is a local
battery or a centralized regulated power supply.
It can operate in point-to-point and point-to-mul-
tipoint configurations as far as S interface is con-
cerned.
By the device microprocessor interface, each
powered line is individually controlled and moni-
tored.
Therefore, overloads and faults are easy to detect
and localize even in a large system.
The status conditions detected by the device on
each line that may be read by the microprocessor
are :
low output voltage
openloop
current overload
thermal overload
normal line conditions
A hardware current limiting programmable feature
is available.
D1
1
D0
2
INT
3
BGND
4
VCC
5
ILIM
6
N.C.
7
VBB
8
N.C.
9
S0
10
S1
11
VBB
12
24
D2
23
D3
22
A0
21
DGND
20
ALE
19
WR
18
CS
17
RD
16
RESET
15
S3
14
RSRVD
13
S2
D94TL102
December 1997
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