DS89C21 Differential CMOS Line Driver and Receiver Pair General Description The DS89C21 is a differential CMOS line driver and receiver pair, designed to meet the requirements of TIA/EIA-422-A (RS-422) electrical characteristics interface standard. The DS89C21 provides one driver and one receiver in a minimum footprint. The device is offered in an 8-pin SOIC package. The CMOS design minimizes the supply current to 6 mA, making the device ideal for use in battery powered or power conscious applications. The driver features a fast transition time specified at 2.2 ns, and a maximum differential skew of 2 ns making the driver ideal for use in high speed applications operating above 10 MHz. The receiver can detect signals as low as 200 mV, and also incorporates hysteresis for noise rejection. Skew is specified at 4 ns maximum. Connection Diagram The DS89C21 is compatible with TTL and CMOS levels (DI and RO). Features n Meets TIA/EIA-422-A (RS-422) and CCITT V.11 recommendation n LOW POWER design — 15 mW typical n Guaranteed AC parameters: — Maximum driver skew 2.0 ns — Maximum receiver skew 4.0 ns n Extended temperature range: −40˚C to +85˚C n Available in SOIC packaging n Operates over 20 Mbps n Receiver OPEN input failsafe feature Truth Tables Driver Input Outputs DO* DI DO H H L L L H DS011753-1 Order Number DS89C21TM See NS Package Number M08A Receiver Inputs Output RI–RI* RO VDIFF ≥ +200 mV H VDIFF ≤ −200 mV L OPEN† H †Non-terminated © 1998 National Semiconductor Corporation DS011753 www.national.com DS89C21 Differential CMOS Line Driver and Receiver Pair June 1998 Absolute Maximum Ratings (Note 1) (TSTG) −65˚C to +150˚C +260˚C Lead Temperature (TL) (Soldering 4 sec.) Maximum Junction Temperature 150˚C Maximum Package Power Dissipation @+25˚C M Package 714 mW Derate M Package 5.7 mW/˚C above +25˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) Driver Input Voltage (DI) Driver Output Voltage (DO, * DO ) Receiver Input Voltage — V 7V −1.5V to VCC + 1.5V −0.5V to +7V CM (RI, RI*) Differential Receiver Input Voltage — VDIFF (RI, RI*) Receiver Output Voltage (RO) Receiver Output Current (RO) Storage Temperature Range Recommended Operating Conditions ± 14V ± 14V Min 4.50 −40 Supply Voltage (VCC) Operating Temperature (TA) Input Rise or Fall Time (DI) −0.5V to VCC +0.5V ± 25 mA Max 5.50 +85 500 Units V ˚C ns Electrical Characteristics (Notes 2, 3) Over recommended supply voltage and operating temperature ranges, unless otherwise specified. Symbol Parameter Conditions Pin Min DI Typ Max Units 2.0 VCC V GND 0.8 V ± 10 µA DRIVER CHARACTERISTICS VIH Input Voltage HIGH VIL Input Voltage LOW IIH, IIL Input Current VCL Input Clamp Voltage I VOD1 Unloaded Output Voltage VOD2 Differential Output Voltage No Load R L = 100Ω ∆VOD2 Change in Magnitude of V V = VCC, GND, 2.0V, 0.8V = −18 mA 0.05 IN IN DO, DO* 4.2 2.0 V 6.0 V 400 mV 3.0 5.0 OD2 −1.5 V for Complementary Output States VOD3 Differential Output Voltage R VOD4 Differential Output Voltage R L = 150Ω = 3.9 kΩ VOC Common Mode Voltage R L = 100Ω ∆VOC Change in Magnitude of V L 2.1 3.1 V 4.0 6.0 V 2.0 3.0 V 2.0 400 mV −115 −150 mA 0.03 +100 µA −0.08 −100 µA RI, −200 RI* 20 ± 25 +200 mV 5.0 9.5 OC for Complementary Output States IOSD Output Short Circuit Current IOFF Output Leakage Current V OUT = 0V VCC = 0V −30 VOUT = +6V VOUT = −0.25V RECEIVER CHARACTERISTICS = +7V, 0V, −7V = 0V VTL, VTH Differential Thresholds V IN VHYS Hysteresis V CM RIN Input Impedance V IIN Input Current = −7V, +7V, Other = 0V Other Input = 0V, VIN = +10V IN VCC = 5.5V and VCC = 0V VOH Output HIGH Voltage IOH = −6 mA VDIFF = OPEN VOL Output LOW Voltage I IOSR Output Short Circuit Current V www.national.com +1.0 VIN = +3.0V VIN = +0.5V VIN = −3V VIN = −10V VDIFF = +1V = +6 mA, VDIFF = −1V OUT = 0V 0 0 RO mV kΩ +1.5 mA +0.22 mA −0.04 mA −0.41 −1.25 mA −2.5 mA 3.8 4.9 V 3.8 4.9 V OL 2 50 −25 0.08 0.3 V −85 −150 mA Electrical Characteristics (Notes 2, 3) (Continued) Over recommended supply voltage and operating temperature ranges, unless otherwise specified. Symbol Parameter Conditions Pin Min Typ Max Units 3.0 6 mA 3.8 12 mA DRIVER AND RECEIVER CHARACTERISTICS ICC Supply Current DI = VCC or GND DI = 2.4V or 0.5V No Load VCC Switching Characteristics (Note 3) Over recommended supply voltage and operating temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units 2 4.9 10 ns 2 4.5 10 ns 0.4 2.0 ns 2.2 9 ns 2.1 9 ns DIFFERENTIAL DRIVER CHARACTERISTICS tPLHD Propagation Delay LOW to HIGH tPHLD Propagation Delay HIGH to LOW tSKD Skew, |tPLHD–t PHLD| tTLH Transition Time LOW to HIGH tTHL Transition Time HIGH to LOW RL = 100Ω CL = 50 pF (Figures 2, 3) (Figures 2, 4) RECEIVER CHARACTERISTICS tPLH Propagation Delay LOW to HIGH tPHL Propagation Delay HIGH to LOW CL = 50 pF VDIFF = 2.5V tSK Skew, |tPLH–t PHL| VCM = 0V tr Rise Time tf (Figures 5, 6) (Figure 7) Fall Time 6 18 30 ns 6 17.5 30 ns 0.5 4.0 ns 2.5 9 ns 2.1 9 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 devices should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 3: All typicals are given for VCC = 5.0V and T A = 25˚C. Note 4: f = 1 MHz, tr and tf ≤ 6 ns. Note 5: ESD Rating: HBM (1.5 kΩ, 100 pF) all pins ≥ 2000V. EIAJ (0Ω, 200 pF) ≥ 250V Parameter Measurement Information DS011753-2 FIGURE 1. VOD and VOC Test Circuit 3 www.national.com Parameter Measurement Information (Continued) DS011753-3 FIGURE 2. Driver Propagation Delay Test Circuit DS011753-4 FIGURE 3. Driver Differential Propagation Delay Timing DS011753-5 FIGURE 4. Driver Differential Transition Timing DS011753-6 FIGURE 5. Receiver Propagation Delay Test Circuit www.national.com 4 Parameter Measurement Information (Continued) DS011753-7 FIGURE 6. Receiver Propagation Delay Timing DS011753-8 FIGURE 7. Receiver Rise and Fall Times 5 www.national.com DS89C21 Differential CMOS Line Driver and Receiver Pair Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS89C21TM NS Package Number M08A 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. 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