DS8922/DS8922A/DS8923A TRI-STATE ® RS-422 Dual Differential Line Driver and Receiver Pairs General Description The DS8922/22A and DS8923A are Dual Differential Line Driver and Receiver pairs. These devices are designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, the devices meet the requirements of the EIA Standard RS-422. These devices offer an input sensitivity of 200 mV over a ± 7V common mode operating range. Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing input waveforms. An input fail-safe circuit is provided such that if the receiver inputs are open the output assumes the logical one state. The DS8922A and DS8923A 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 (typ.) with propagation delays of 12 ns. Both devices feature TRI-STATE outputs. The DS8922/22A have independent control functions common to a driver and receiver pair. The DS8923A has separate driver and receiver control functions. Power up/down circuitry is featured which will TRI-STATE the outputs and prevent erroneous glitches on the transmission lines during system power up or power down operation. The DS8922/22A and DS8923A are designed to be compatible with TTL and CMOS. Features n n n n n n n n n n 12 ns typical propagation delay Output skew — ± 0.5 ns typical Meets the requirements of EIA Standard RS-422 Complementary Driver Outputs High differential or common-mode input voltage ranges of ± 7V ± 0.2V receiver sensitivity over the input voltage range Receiver input fail-safe circuitry Receiver input hysteresis — 70 mV typical Glitch free power up/down TRI-STATE outputs Connection Diagrams DS8922A Dual-In-Line DS008511-1 Order Number DS8922M, DS8922N, DS8922AM or DS8922AN See NS Package Number M16A or N16E TRI-STATE ® is a registered trademark of National Semiconductor Corp. © 1998 National Semiconductor Corporation DS008511 www.national.com DS8922/DS8922A/DS8923A TRI-STATE RS-422 Dual Differential Line Driver and Receiver Pairs June 1998 Connection Diagrams (Continued) DS8923A Dual-In-Line DS008511-2 Order Number DS8923AM, DS8923AN, See NS Package Number M16A or N16E Truth Tables DS8922/22A EN1 EN2 RO1 RO2 DO1 DO2 0 0 ACTIVE ACTIVE ACTIVE ACTIVE 1 0 HI-Z ACTIVE HI-Z ACTIVE 0 1 ACTIVE HI-Z ACTIVE HI-Z 1 1 HI-Z HI-Z HI-Z HI-Z DS8923A DEN REN RO1 RO2 DO1 DO2 0 0 ACTIVE ACTIVE ACTIVE ACTIVE 1 0 ACTIVE ACTIVE HI-Z HI-Z 0 1 HI-Z HI-Z ACTIVE ACTIVE 1 1 HI-Z HI-Z HI-Z HI-Z www.national.com 2 Absolute Maximum Ratings (Note 1) N Package 1450 mW Derate M Package 10.4 mW/˚C above +25˚C Derate N Package 11.6 mW/˚C above +25˚C Storage Temperature Range −65˚C to +165˚C Lead Temp. (Soldering, 4 seconds) 260˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Drive Input Voltage −0.5V to +7V Output Voltage 5.5V Receiver Output Sink Current 50 mA ± 10V Receiver Input Voltage ± 12V Differential Input Voltage Maximum Package Power Dissipation @ +25˚C M Package 1300 mW Recommended Operating Conditions Min 4.5 0 Supply Voltage Temperature (TA) Max 5.5 70 Units V ˚C DS8922/22A and DS8923A Electrical Characteristics(Notes 2, 3, 4) Symbol Conditions Min Typ Max Units −200 ± 35 +200 mV RECEIVER VTH −7V ≤ VCM ≤ +7V VHYST 15 70 4.0 6.0 IIN −7V ≤ VCM ≤ +7V V IN = −7V, +7V (Other Input = GND) VIN = 10V VOH V 2.5 VOL VIN = −10V CC = MIN, IOH = − 400 µA V CC = MAX, IOL = 8 mA ISC V CC VOH V CC VOL V CC IOFF V CC RIN = MAX, VOUT = 0V −15 = MIN, IOH = −20 mA = MIN, IOL = +20 mA = 0V, VOUT = 5.5V 2.5 mV kΩ 3.25 mA −3.25 mA 0.5 V −100 mA V DRIVER V |VT|–| VT | VT V 100 µA 0.4 V 2.0 V |VOS– VOS | ISC 0.5 V CC = MAX, VOUT = 0V −30 0.4 V −150 mA DRIVER and RECEIVER VOUT = 2.5V VOUT = 0.4V 50 µA VCC = MAX −50 µA VCC = MAX ACTIVE 76 mA TRI-STATE 78 mA 0.8 V IOZ TRI-STATE Leakage ICC DRIVER and ENABLE INPUTS VIH 2.0 V VIL IIL V CC IIH V CC II V CC VCL V CC = MAX, VIN = 0.4V = MAX, VIN = 2.7V = MAX, VIN = 7.0V = MIN, IIN = −18 mA −40 3 −200 µA 20 µA 100 µA −1.5 V www.national.com Receiver Switching Characteristics (Figures 1, 2, 3) Parameter Conditions Min Typ Max Units 8922 8922A/23A 12 22.5 20 12 22.5 20 ns 0.5 5 3.5 ns 0.5 3.0 2.0 ns TpZL CL = 30 pF CL = 15 pF S2 Open CL = 15 pF S1 Open CL = 30 pF S2 Open TpZH CL = 30 pF S1 Open TpLH TpHL |TpLH–T pHL| Skew (Channel to Channel) TpLZ TpHZ CL = 30 pF CL = 30 pF CL = 30 pF ns 15 ns 15 ns 20 ns 20 ns Driver Switching Characteristics Parameter Conditions Min SINGLE ENDED CHARACTERISTICS (Figures 4, 5, 6, 8) CL = 30 pF TpLH TpHL TTLH TTHL |TpLH–T pHL| Skew Typ Max Units 8922 8922A/23A 12 15 15 CL = 30 pF CL = 30 pF CL = 30 pF 12 15 15 ns 5 10 10 ns 5 10 10 CL = 30 pF CL = 30 pF (Note 5) 0.5 Skew (Channel to Channel) ns ns ns 0.5 5 3.5 ns 0.5 3.0 2.0 ns 15 ns 15 ns TpZL CL = 30 pF CL = 30 pF CL = 30 pF 20 ns TpZH CL = 30 pF 20 ns TpLZ TpHZ DIFFERENTIAL SWITCHING CHARACTERISTICS (Note 6), (Figure 4) TpLH CL = 30 pF TpHL |TpLH–T pHL| CL = 30 pF CL = 30 pF 12 15 15 12 15 15 ns ns 0.5 6.0 2.75 ns 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 specifications 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: Tcp = Crossing Point Tra, Trb, Tfa and Tfb are time measurements with respect to the input. www.national.com 4 Switching Time Waveforms DS008511-3 AC Test Circuits and Switching Waveforms DS008511-4 FIGURE 1. DS008511-5 FIGURE 2. 5 www.national.com AC Test Circuits and Switching Waveforms (Continued) DS008511-6 S1 S2 S3 TPLZ Closed Open +2.5V TPHZ Open Closed −2.5V TPZL Closed Open +2.5V TPZH Open Closed −2.5V FIGURE 3. DS008511-7 FIGURE 4. DS008511-8 FIGURE 5. DS008511-9 FIGURE 6. www.national.com 6 AC Test Circuits and Switching Waveforms (Continued) DS008511-10 FIGURE 7. DS008511-13 FIGURE 8. Typical Performance Characteristics (DS8923A) Driver VOH vs IOH vs Temperature Driver VOH vs IOH vs VCC DS008511-15 DS008511-14 Driver VOL vs IOL vs Temperature Driver VOL vs IOL vs VCC DS008511-17 DS008511-16 7 www.national.com Typical Performance Characteristics (DS8923A) (Continued) Receiver VOH vs IOH vs Temperature Receiver VOH vs IOH vs VCC DS008511-19 DS008511-18 Receiver VOL vs IOL vs Temperature Receiver VOL vs IOL vs VCC DS008511-21 DS008511-20 Driver Differential Propagation Delay vs Temperature Driver Differential Propagation Delay vs VCC DS008511-22 www.national.com DS008511-23 8 Typical Performance Characteristics (DS8923A) (Continued) Receiver Propagation Delay vs Temperature Receiver Propagation Delay vs VCC DS008511-24 Driver VOD vs Temperature DS008511-25 Driver VOD vs VCC DS008511-26 Driver VOD vs RL DS008511-27 Driver Differential Transition Time vs Temperature DS008511-28 DS008511-29 9 www.national.com Typical Performance Characteristics (DS8923A) (Continued) Driver Differential Transition Time vs VCC Supply Current vs Temperature DS008511-31 DS008511-30 Supply Current vs V ICC vs Driver Switching Frequency CC DS008511-32 Driver Short Circuit Current vs Temperature DS008511-33 Driver Short Circuit Current vs VCC DS008511-34 www.national.com DS008511-35 10 Typical Performance Characteristics (DS8923A) (Continued) Receiver Short Circuit Current vs Temperature Receiver Short Circuit Current vs VCC DS008511-36 DS008511-37 Typical Applications ESDI Application DS008511-11 11 www.national.com Typical Applications (Continued) ST504 and ST412 Applications DS008511-12 www.national.com 12 Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS8922M, DS8922AM, or DS8923AM NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DS8922N, DS8922AN, or DS8923AN NS Package Number N16E 13 www.national.com DS8922/DS8922A/DS8923A TRI-STATE RS-422 Dual Differential Line Driver and Receiver Pairs LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. 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. 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