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 00851101 Order Number DS8922M, DS8922N, DS8922AM or DS8922AN See NS Package Number M16A or N16E TRI-STATE ® is a registered trademark of National Semiconductor Corp. © 2004 National Semiconductor Corporation DS008511 www.national.com DS8922/DS8922A/DS8923A TRI-STATE RS-422 Dual Differential Line Driver and Receiver Pairs July 2004 DS8922/DS8922A/DS8923A Connection Diagrams (Continued) DS8923A Dual-In-Line 00851102 Order Number DS8923AM, DS8923AN, See NS Package Number M16A or N16E 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 www.national.com 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 2 Derate M Package 10.4 mW/˚C above +25˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Derate N Package 11.6 mW/˚C above +25˚C Supply Voltage Storage Temperature Range 7V Drive Input Voltage −65˚C to +165˚C Lead Temp. (Soldering, 4 seconds) 260˚C ESD Rating (HBM) 2000V+ −0.5V to +7V Output Voltage 5.5V Receiver Output Sink Current Recommended Operating Conditions 50 mA ± 10V ± 12V Receiver Input Voltage Differential Input Voltage Supply Voltage Maximum Package Power Dissipation @ +25˚C M Package 1300 mW N Package 1450 mW Temperature (TA) Min Max 4.5 5.5 Units V 0 70 ˚C DS8922/22A and DS8923A Electrical Characteristics(Notes 2, 3, 4) Symbol Conditions Min Typ Max Units +200 mV RECEIVER VTH −7V ≤ VCM ≤ +7V −200 ± 35 VHYST −7V ≤ VCM ≤ +7V 15 70 mV RIN V 4.0 6.0 kΩ IIN VIN = 10V 3.25 mA VIN = −10V −3.25 mA IN = −7V, +7V (Other Input = GND) VOH V CC = MIN, IOH = − 400 µA VOL V CC = MAX, IOL = 8 mA ISC V CC = MAX, VOUT = 0V −15 VOH V CC = MIN, IOH = −20 mA 2.5 VOL V CC = MIN, IOL = +20 mA 0.5 V IOFF V CC = 0V, VOUT = 5.5V 100 µA 0.4 V 2.5 V 0.5 V −100 mA DRIVER V |VT|–| VT | VT 2.0 V |VOS– VOS | ISC V CC = MAX, VOUT = 0V −30 0.4 V −150 mA DRIVER and RECEIVER IOZ TRI-STATE VCC = MAX VOUT = 2.5V 50 µA VOUT = 0.4V −50 µA ACTIVE 76 mA TRI-STATE 78 mA Leakage ICC VCC = MAX DRIVER and ENABLE INPUTS VIH 2.0 V VIL 0.8 V −200 µA 20 µA = MAX, VIN = 7.0V 100 µA = MIN, IIN = −18 mA −1.5 V IIL V CC = MAX, VIN = 0.4V IIH V CC = MAX, VIN = 2.7V II V CC VCL V CC −40 3 www.national.com DS8922/DS8922A/DS8923A Absolute Maximum Ratings (Note 1) DS8922/DS8922A/DS8923A Receiver Switching Characteristics (Figures 1, 2, 3) Parameter Conditions Min Typ Max Units 8922 8922A/23A TpLH CL = 30 pF 12 22.5 20 ns TpHL CL = 30 pF 12 22.5 20 ns |TpLH–T pHL| CL = 30 pF 0.5 5 3.5 ns Skew (Channel to Channel) CL = 30 pF 0.5 3.0 2.0 ns TpLZ CL = 15 pF S2 Open 15 ns TpHZ CL = 15 pF S1 Open 15 ns TpZL CL = 30 pF S2 Open 20 ns TpZH CL = 30 pF S1 Open 20 ns Driver Switching Characteristics Parameter Conditions Min Typ Max Units 8922 8922A/23A SINGLE ENDED CHARACTERISTICS (Figures 4, 5, 6, 8) TpLH CL = 30 pF 12 15 15 ns TpHL CL = 30 pF 12 15 15 ns TTLH CL = 30 pF 5 10 10 ns TTHL CL = 30 pF 5 10 10 ns |TpLH–T pHL| CL = 30 pF 0.5 Skew CL = 30 pF (Note 5) Skew (Channel to Channel) ns 0.5 5 3.5 ns 0.5 3.0 2.0 ns TpLZ CL = 30 pF 15 ns TpHZ CL = 30 pF 15 ns TpZL CL = 30 pF 20 ns TpZH CL = 30 pF 20 ns DIFFERENTIAL SWITCHING CHARACTERISTICS (Note 6), (Figure 4) TpLH CL = 30 pF 12 15 15 TpHL CL = 30 pF 12 15 15 ns |TpLH–T pHL| CL = 30 pF 0.5 6.0 2.75 ns 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 DS8922/DS8922A/DS8923A Switching Time Waveforms 00851103 AC Test Circuits and Switching Waveforms 00851104 FIGURE 1. 00851105 FIGURE 2. 5 www.national.com DS8922/DS8922A/DS8923A AC Test Circuits and Switching Waveforms (Continued) 00851106 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. 00851107 FIGURE 4. 00851108 FIGURE 5. www.national.com 6 DS8922/DS8922A/DS8923A AC Test Circuits and Switching Waveforms (Continued) 00851109 FIGURE 6. 00851110 FIGURE 7. 00851113 FIGURE 8. 7 www.national.com DS8922/DS8922A/DS8923A Typical Performance Characteristics (DS8923A) Driver VOH vs IOH vs Temperature Driver VOH vs IOH vs VCC 00851114 00851115 Driver VOL vs IOL vs Temperature Driver VOL vs IOL vs VCC 00851116 00851117 Receiver V OH vs IOH vs Temperature Receiver VOH vs IOH vs VCC 00851118 www.national.com 00851119 8 DS8922/DS8922A/DS8923A Typical Performance Characteristics (DS8923A) (Continued) Receiver V OL vs IOL vs Temperature Receiver VOL vs IOL vs VCC 00851120 00851121 Driver Differential Propagation Delay vs Temperature Driver Differential Propagation Delay vs VCC 00851122 00851123 Receiver Propagation Delay vs Temperature Receiver Propagation Delay vs VCC 00851124 00851125 9 www.national.com DS8922/DS8922A/DS8923A Typical Performance Characteristics (DS8923A) (Continued) Driver VOD vs Temperature Driver VOD vs VCC 00851126 00851127 Driver Differential Transition Time vs Temperature Driver VOD vs RL 00851128 00851129 Driver Differential Transition Time vs VCC Supply Current vs Temperature 00851131 00851130 www.national.com 10 Supply Current vs V DS8922/DS8922A/DS8923A Typical Performance Characteristics (DS8923A) (Continued) ICC vs Driver Switching Frequency CC 00851132 00851133 Driver Short Circuit Current vs Temperature Driver Short Circuit Current vs VCC 00851134 00851135 Receiver Short Circuit Current vs Temperature Receiver Short Circuit Current vs VCC 00851136 00851137 11 www.national.com DS8922/DS8922A/DS8923A Typical Applications ESDI Application 00851111 ST504 and ST412 Applications 00851112 www.national.com 12 DS8922/DS8922A/DS8923A 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 Notes 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure 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 is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. 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