DESCRIPTION
The LTC488 and LTC489 are low power differential bus/
line receivers designed for multipoint data transmission
standard RS485 applications with extended common
mode range (12V to –7V). They also meet the require-
ments of RS422.
The CMOS design offers signi?cant power savings over
its bipolar counterpart without sacri?cing ruggedness
against overload or ESD damage.
The receiver features three-state outputs, with the receiver
output maintaining high impedance over the entire com-
mon mode range.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
Both AC and DC speci?cations are guaranteed 4.75V to
5.25V supply voltage range.
FEATURES
Low Power: ICC = 7mA Typ
Designed for RS485 or RS422 Applications
Single 5V Supply
–7V to 12V Bus Common Mode Range Permits ±7V
Ground Difference Between Devices on the Bus
60mV Typical Input Hysteresis
Receiver Maintains High Impedance in Three-State or
with the Power Off
28ns Typical Receiver Propagation Delay
Pin Compatible with the SN75173 (LTC488)
Pin Compatible with the SN75175 (LTC489)
APPLICATIONS
Low Power RS485/RS422 Receivers
Level Translator
TYPICAL APPLICATION
N PACKAGE
SW PACKAGE
N PACKAGE
SW PACKAGE
TEST CIRCUITS
Receiver Timing Test Circuit
The input pulse is supplied by a generator having the following characteristics:
f = 1MHz, Duty Cycle = 50%, t< 10ns, t≤ 10ns, ZOUT= 50Ω
Receiver Enable and Disable Timing Test Circuit
P/N Temp(0℃） Package
LTC488CN 0℃ to 70℃ DIP-16
LTC488CSW 0℃ to 70℃ SO-16
LTC488IN -40℃ to 85℃ DIP-16
LTC488ISW -40℃ to 85℃ SO-16
LTC489CN 0℃ to 70℃ DIP-16
LTC489CSW 0℃ to 70℃ SO-16
LTC489IN -40℃ to 85℃ DIP-16
LTC489ISW -40℃ to 85℃ SO-16