®
L9637
ISO 9141 INTERFACE
OPERATING POWER SUPPLY VOLTAGE
RANGE 4.5V
≤
V
S
≤
36V (40V FOR TRAN-
SIENTS)
REVERSE SUPPLY (BATTERY) PRO-
TECTED DOWN TO V
S
≥
-24V
STANDBY MODE WITH VERY LOW CUR-
RENT CONSUMPTION IS
SB
1µA @ V
CC
0.5V
LOW QUIESCENT CURRENT IN OFF CON-
DITION IS
OFF
= 120
µ
A
TTL COMPATIBLE TX INPUT
BIDIRECTIONAL K-I/O PIN WITH SUPPLY
VOLTAGE DEPENDENT INPUT THRESHOLD
OVERTEMPERATURE SHUT DOWN FUNC-
TION SELECTIVE TO K-I/O PIN
WIDE INPUT AND OUTPUT VOLTAGE
RANGE -24V
≤
V
K
≤
V
S
K OUTPUT CURRENT LIMITATION, TYP I
K
=
60mA
DEFINED OFF OUTPUT STATUS IN UNDER-
VOLTAGE CONDITION AND VS OR GND IN-
TERRUPTION
CONTROLLED OUTPUT SLOPE FOR LOW
EMI
HIGH INPUT IMPEDANCE FOR OPEN V
S
OR
GND CONNECTION
BLOCK DIAGRAM
SO8
Minidip
ORDERING NUMBERS:
L9637D
L9637
DEFINED OUTPUT ON STATUS OF LO OR
RX FOR OPEN LI OR K INPUTS
DEFINED K OUTPUT OFF FOR TX INPUT
OPEN
INTEGRATED PULL UP RESISTORS FOR
TX, RX AND LO
EMI ROBUSTNESS OPTIMIZED
DESCRIPTION
The L9637 is a monolithic integrated circuit con-
taining standard ISO 9141 compatible interface
functions.
VCC
VS
RTX
RL O
RRX
K
IK
OFF
-
+
1, 75 V
TX
-
+
LI
IL I
RX
-
+
LO
GND
December 1998
1/11
STMICROELECTRONICS [ STMICROELECTRONICS ]
