LTC488/LTC489
Quad RS485 Line Receiver
U
EATURE
S
F
DESCRIPTIO
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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
The LTC®488 and LTC489 are low power differential bus/
line receivers designed for multipoint data transmission
standardRS485applicationswithextendedcommonmode
range (12V to –7V). They also meet the requirements of
RS422.
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TheCMOSdesignofferssignificantpowersavingsoverits
bipolarcounterpartwithoutsacrificingruggednessagainst
overload or ESD damage.
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28ns Typical Receiver Propagation Delay
Pin Compatible with the SN75173 (LTC488)
Pin Compatible with the SN75175 (LTC489)
Thereceiverfeaturesthree-stateoutputs,withthereceiver
output maintaining high impedance over the entire com-
mon mode range.
O U
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
PPLICATI
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Low Power RS485/RS422 Receivers
Level Translator
Both AC and DC specifications are guaranteed 4.75V to
5.25V supply voltage range.
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, LTC and LT are registered trademarks of Linear Technology Corporation.
U
O
TYPICAL APPLICATI
EN
EN
EN
EN
4
2
1
12
DRIVER
1/4 LTC486
RECEIVER
1/4 LTC488
3
120Ω
120Ω
RO
DI
4000 FT 24 GAUGE TWISTED PAIR
EN12
EN12
4
2
1
DRIVER
1/4 LTC487
RECEIVER
1/4 LTC489
3
120Ω
120Ω
RO
DI
4000 FT 24 GAUGE TWISTED PAIR
LTC488/9 TA01
1