®
SP3490/SP3491
+3.3V Low Power Full Duplex RS-485
Transceivers with 10Mbps Data Rate
■
Full Duplex RS-485 and RS-422
Transceivers
■
Operates from a single +3.3V supply
■
Interoperable with +5.0V logic
■
Driver/Receiver Tri-state Enable
Lines (SP3491)
■
-7V to +12V Common-Mode Input
Voltage Range
■
+200mV Receiver Input Sensitivity
■
Allows up to 32 transceivers on
the serial bus
■
Compatibility with LTC490
and SN75179 (SP3490)
■
Compatibility with LTC491
and SN75180 (SP3491)
DESCRIPTION
The
SP3490
and the
SP3491
are +3.3V low power full duplex transceivers that meet the
specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin
compatible with the
Sipex
SP490 and SP491 devices as well as popular industry standards.
The
SP3490
and the
SP3491
feature
Sipex's
BiCMOS process, allowing low power operation
without sacrificing performance. The
SP3490
and
SP3491
meet the electrical specifications
of RS-485 and RS-422 serial protocols up to 10Mbps under load. The
SP3491
is identical to
the
SP3490
with the addition of driver and receiver tri-state enable lines.
NC 1
14 Vcc
13 NC
12 A
Vcc 1
R 2
R 2
8 A
R
11 B
R
REB 3
7 B
DE 4
6 Z
D 3
GND 4
10 Z
D 5
D
5 Y
D
GND 6
GND 7
9 Y
8 NC
SP3490
SP3491
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
