DS8921 NSC | Alldatasheet

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n 12 ns typical propagation delay n Output skew - 0.5 ns typical n Meet the requirements of EIA Standard RS-422 n Complementary Driver Outputs n High differential or common-mode input voltage ranges of±7V n ±0.2V receiver sensitivity over the input voltage range n Receiver input hysteresis-70 mV typical n DS8921AT industrial temperature operation: (−40˚C to +85˚C) Connection Diagram Truth Table Receiver Driver Input V OUT Input V OUT VOUT VID ≥ VTH (MAX) 1 1 1 0 VID ≤ VTH (MIN) 0 0 0 1 Open 1 DS008512-1 Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, DS8921ATM, or DS8921ATN See NS Package Number M08A or N08E May 1998 DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair © 1998 National Semiconductor Corporation DS008512 www.national.com

Absolute Maximum Ratings(Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Driver Input Voltage −0.5V to +7V Output Voltage 5.5V Receiver Output Sink Current 50 mA Receiver Input Voltage ±10V Differential Input Voltage ±12V Maximum Package Power Dissipation@ +25˚C M Package 730 mW N Package 1160 mW Derate M Package 9.3 mW/˚C above +25˚C Derate N Package 5.8 mW/˚C above +25˚C Storage Temperature Range −65˚C to +165˚C Lead Temperature +260˚C (Soldering, 4 sec.) +260˚C Maximum Junction Temperature +150˚C Recommended Operating Conditions Min Max Units Supply Voltage 4.5 5.5 V Temperature (T DS8921/DS8921A 0 70 ˚C DS8921AT −40 +85 ˚C DS8921/DS8921A Electrical Characteristics(Notes 2, 3, 4) Symbol Conditions Min Typ Max Units RECEIVER V TH −7V ≤ VCM ≤ +7V −200 ±35 +200 mV VHYST −7V ≤ VCM ≤ +7V 15 70 mV R IN VIN = −7V, +7V 4.0 6.0 k Ω (Other Input= GND) IIN VIN = 10V 3.25 mA VIN = −10V −3.25 mA VOH IOH = −400 µA 2.5 V VOL IOL = 8 mA 0.5 V ISC VCC = MAX, VOUT = 0V −15 −100 mA DRIVER V IH 2.0 V VIL 0.8 V IIL VCC = MAX, VIN = 0.4V −40 −200 µA IIH VCC = MAX, VIN = 2.7V 20 µA II VCC = MAX, VIN = 7.0V 100 µA VCL VCC = MIN, IIN = −18 mA −1.5 V VOH VCC = MIN, IOH = −20 mA 2.5 V VOL VCC = MIN, IOL = +20 mA 0.5 V IOFF VCC = 0V, VOUT = 5.5V 100 µA VT 2.0 V |VOS –V OS | 0.4 V ISC VCC = MAX, VOUT = 0V −30 −150 mA DRIVER and RECEIVER I CC VCC = MAX, VOUT = Logic 0 35 mA www.national.com 2

Receiver Switching Characteristics Figure 1(Figure 2) Symbol Conditions Min Typ Max Units 8921 8921A 8921AT TpLH C L = 30 pF 14 22.5 20 20 ns (Figures 1, 2) TpHL C L = 30 pF 14 22.5 20 20 ns (Figures 1, 2) |TpLH –T pHL |C L = 30 pF 0.5 5 3.5 5 ns (Figures 1, 2) Driver Switching Characteristics SINGLE ENDED CHARACTERISTICS (Figures 3, 4) Symbol Conditions Min Typ Max Units 8921 8921A 8921AT TpLH C L = 30 pF 10 15 15 15 ns (Figures 3, 4) TpHL C L = 30 pF 10 15 15 15 ns (Figures 3, 4) TTLH C L = 30 pF 5 8 8 9.5 ns (Figures 7, 8) TTHL C L = 30 pF 5 8 8 9.5 ns (Figures 7, 8) Skew CL = 30 pF 1 5 3.5 3.5 ns (Figures 3, 4) Driver Switching Characteristics(Note 6) DIFFERENTIAL CHARACTERISTICS (Figures 3, 5) Symbol Conditions Min Typ Max Units 8921 8921A 8921AT TpLH C L = 30 pF 10 15 15 15 ns (Figures 3, 5, 6) TpHL C L = 30 pF 10 15 15 15 ns (Figures 3, 5, 6) |TpLH –T pHL |C L = 30 pF 0.5 6 2.75 2.75 ns (Figures 3, 5, 6) Note 1:“Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The Table of “Electrical Characteristics” provides conditions for actual device operation. Note 2: All currents into device pins are shown as positive values; all currents out of the device are shown as negative; all voltages are referenced to ground unless otherwise specified. All values shown as max or min are classified on absolute value basis. Note 3:All typical values are VCC = 5V, TA = 25˚C. Note 4:Only one output at a time should be shorted. Note 5: Difference between complementary outputs at the 50% point. Note 6:Differential Delays are defined as calculated results from single ended rise and fall time measurements. This approach in establishing AC performance speci- fications has been taken due to limitations of available Automatic Test Equipment (ATE). The calculated ATE results assume a linear transition between measurement points and are a result of the following equations: Where: Tcr = Crossing Point Tra,Trb,Tfaand T fbare time measurements with respect to the input. SeeFigure 6. www.national.com3

ST506 and ST412 Application DS008512-8 DS008512-9 www.national.com5

Physical Dimensionsinches (millimeters) unless otherwise noted Order Number DS8921M, DS8921AM or DS8921ATM Molded Dual-In-Line Package (N) Order Number DS8921N, DS8921AN or DS8921ATN www.national.com7

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.