Specification	DS8921M/NOPB

Duplex	Full
Mounting Type	Surface Mount
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Package / Case	8-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Protocol	RS422, RS485
Receiver Hysteresis	70 mV
Supplier Device Package	8-SOIC
Type	Transceiver
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	4.5 V

DS8921 Series

Part	Duplex	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Protocol	Receiver Hysteresis	Mounting Type	Package / Case	Package / Case [y]	Package / Case [x]	Voltage - Supply [Min]	Voltage - Supply [Max]	Type	Package / Case	Package / Case
Texas Instruments DS8921MX	Full	70 °C	0 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921N	Full	70 °C	0 °C	8-PDIP	RS422 RS485	70 mV	Through Hole	8-DIP			4.5 V	5.5 V	Transceiver	0.3 in	7.62 mm
Texas Instruments DS8921N/NOPB	Full	70 °C	0 °C	8-MDIP	RS422 RS485	70 mV	Through Hole	8-DIP			4.5 V	5.5 V	Transceiver	0.3 in	7.62 mm
Texas Instruments DS8921M	Full	70 °C	0 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921AM	Full	70 °C	0 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921AMX	Full	70 °C	0 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921ATMX/NOPB	Full	85 °C	-40 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921M/NOPB	Full	70 °C	0 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921ATM	Full	85 °C	-40 °C	8-SOIC	RS422	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver
Texas Instruments DS8921ATM/NOPB	Full	85 °C	-40 °C	8-SOIC	RS422 RS485	70 mV	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.5 V	5.5 V	Transceiver

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 4.64
		10	$ 3.08
		25	$ 2.68
		100	$ 2.22
		250	$ 2.00
		500	$ 1.87
		1000	$ 1.76
		2500	$ 1.64
		5000	$ 1.56
Texas Instruments	TUBE	1	$ 2.52
		100	$ 2.21
		250	$ 1.55
		1000	$ 1.25

Description

General part information

DS8921 Series

The DS8921, DS8921A, and DS8921AT devices are differential line driver and receiver pairs designed specifically for applications meeting the ST506, ST412, and ESDI disk drive standards. In addition, these devices meet the requirements of the EIA standard RS-422.

The DS8921x receivers offer an input sensitivity of 200 mV over a &plsumn;7 V common mode operating range. Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing input waveforms.

The DS8921x drivers are designed to provide unipolar differential drive to twisted-pair or parallel wire transmission lines. Complementary outputs are logically ANDed and provide an output skew of 0.5 ns (typical) with propagation delays of 12 ns.

Documents

Technical documentation and resources

Datasheet

HS, Low Skew RS-422 Drvrs & Receivers Solve Critical System Timing Problems (Rev. A)

Application note