SP3490EN-L Datasheet, PDF (1/12 Pages) Exar Corporation – +3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate

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
• Compatability with LTC490 and SN75179 (SP3490)
• Compatability with LTC491 and SN75180 (SP3491)
VCC ¹
R2
8A
R
7B
D3
D
6Z
5Y
GND ⁴
SP3490
DESCRIPTION
The SP3490 and SP3491 devices 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 Exar SP490 and SP491 devices as well as popular industry standards.
The SP3490 and SP3491 feature Exar's BiCMOS process, allowing low power operation
without sacrificing performance. The SP3490 and SP3491 meet the electrical specifications
of the 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 reciveiver tri-state enable lines.
NC ¹
14 _VCC
13 _NC
R2
12 _A
R
11 _B
REB
DE
3
4
D5
D
6
GND
GND
7
10 _Z
9Y
8 _NC
SP3491
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3490_3491_102_102710