SP3490CP datasheet(8/11 Pages) SIPEX

Part #	SP3490CP

Description	3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate

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Manufacturer	SIPEX [Sipex Corporation]

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Rev. 10/11/02

SP3490/3491 Low Power Full-Duplex RS485 Transceivers

8

DESCRIPTION

The SP3490 and the SP3491 are two members

in the family of +3.3V low power full duplex

transceivers that meet the electrical specifications

of the RS-485 and RS-422 serial protocols.

These devices are pin-to-pin compatible with

the Sipex SP490 and the 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.

Driver

The drivers for both the SP3490 and SP3491

have differential outputs. The typical voltage

output swing with no load will be 0 volts to V

CC.

With a load of 54

Ω across the differential

outputs, the driver maintains greater than 1.5V

voltage levels.

The driver of the SP3491 has a driver enable

control line which is active high. A logic high on

DE (pin 4) of the SP3491 will enable the differ-

ential driver outputs. A logic low on DE (pin 4)

of the SP3491 will tri-state the driver outputs.

The SP3490 does not have a driver enable.

Receiver

The receivers for the SP3490 and SP3491 have

differential inputs with an input sensitivity

as low as

±100mV. Input impedance of the

receivers is typically 15k

Ω (12kΩ minimum).

A wide common mode range of -7V to +12V

allows for large ground potential differences

between systems. The receivers for both the

SP3490 and SP3491 are equipped with a

fail-safe feature that guarantees the receiver

output will be in a high state when the input

is left unconnected.

The receiver of the SP3491 has a receiver enable

control line which is active low. A logic low on

REB (pin 3) of the SP3491 will enable the

differential receiver. A logic high on REB

(pin 3) of the SP3491 will tri-state the receiver.

Similar Part No. - SP3490CP

Manufacturer	Part #	Datasheet	Description
Sipex Corporation	SP3490CP	124Kb / 11P	3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate

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Similar Description - SP3490CP

Manufacturer	Part #	Datasheet	Description
Sipex Corporation	SP3490	124Kb / 11P	3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
Exar Corporation	SP3490	776Kb / 12P	3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate
	SP3490EN-L-TR	776Kb / 12P	3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate
	SP3490EN-L	693Kb / 12P	3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate
Sipex Corporation	SP3481	156Kb / 9P	3.3V Low Power Half-Duplex RS-485 Transceivers with 10Mbps Data Rate
Sipex Corporation	SP3481	125Kb / 9P	3.3V Low Power Half-Duplex RS-485 Transceivers with 10Mbps Data Rate
Exar Corporation	SP3485EN-L	544Kb / 9P	3.3V Low Power Half-Duplex RS-485 Transceiver with 10Mbps Data Rate
Analog Devices	ADM489ARZ-REEL7	386Kb / 16P	Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers REV. D
	ADM488	212Kb / 12P	Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers REV. 0
	ADM488A	304Kb / 16P	Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers Rev. B

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SP3490CP Datasheet(PDF) 8 Page - Sipex Corporation

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Similar Description - SP3490CP

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