®
SP3493/SP3494
+3.3V Low Power
RS-485/RS-422 Transceivers
■ Operates From A Single +3.3V Supply
■ Interoperable With +5V Logic
■ +200mV Receiver Input Sensitivity
■ -7V to +12V Common-Mode Input
Voltage Range
■ Devices Allow Up To 32 Transceivers
On The Serial Bus
■ Driver/Receiver Enable Lines (SP3494)
■ 2nA Low-Power Shutdown Mode (SP3494)
■ Compatible With The MAX3488, LTC490
and 75179 Industry Standard Pinouts
(SP3493)
■ Compatible With The MAX3486 and 75176
Industry Standard Pinouts (SP3494)
DESCRIPTION
The SP3493 and the 3494 devices are +3.3V, low power transceivers that meet the
specifications of the RS-485 and RS-422 serial protocols. The SP3493 and the 3494 devices
are pin-to-pin compatible with the Sipex SP3490 and the SP3481 devices, respectively, as well
as other popular industry standards. The devices feature Sipex's BiCMOS process, allowing
low power operation without sacrificing performance. The partially slew-rate limited drivers
minimize EMI and reduce reflections caused by improperly terminated cables allowing
error-free data transmission. The SP3493 is a full-duplex low power transceiver that will
deliveradatatransmissionrateupto250kbps. TheSP3494isahalf-duplexpartiallyslew-rate
limited transceiver that will deliver a data transmission rate up to 2.5Mbps. The SP3494 is
equipped with a low-power shutdown mode and driver/receiver high-Z enable lines.
Vcc 1
8 A
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
R
CC
R 2
R
7 B
6 Z
D 3
D
5 Y
D
GND 4
GND
SP3493
SP3494
10/16/02
SP3493/3494 +3.3V Low Power Slew-Rate Limited RS-485/RS-422 Transceivers
© Copyright 2002 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
