DS8921,DS8921A,DS8921AT DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair Literature Number: SNLS374B DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair General Description The DS8921, DS8921A 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 DS8921, DS8921A receivers 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. The DS8921, DS8921A 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. The DS8921, DS8921A are designed to be compatible with TTL and CMOS. Features 12 ns typical propagation delay Output skew - 0.5 ns typical Meet the requirements of EIA Standard RS-422 Complementary Driver Outputs 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: (-40C to +85C) n n n n n Connection Diagram 00851201 Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, DS8921ATM, or DS8921ATN See NS Package Number M08A or N08E Truth Table Receiver Input Driver VOUT Input VOUT VOUT VID VTH (MAX) 1 1 1 0 VID VTH (MIN) 0 0 0 1 Open 1 (c) 2004 National Semiconductor Corporation DS008512 www.national.com DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair May 1998 DS8921/DS8921A/DS8921AT Absolute Maximum Ratings (Note 1) Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Lead Temperature +260C Maximum Junction Temperature -0.5V to +7V Output Voltage +260C (Soldering, 4 sec.) 7V Driver Input Voltage -65C to +165C +150C 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 @ +25C M Package 730 mW N Package 1160 mW Derate M Package 9.3 mW/C above +25C Derate N Package 5.8 mW/C above +25C Min Max Units 4.5 5.5 V 0 70 C -40 +85 C Temperature (TA) DS8921/DS8921A DS8921AT DS8921/DS8921A Electrical Characteristics (Notes 2, 3, 4) Symbol Conditions Min Typ Max Units -200 35 +200 mV RECEIVER VTH -7V VCM +7V VHYST -7V VCM +7V 15 70 mV RIN VIN = -7V, +7V 4.0 6.0 k (Other Input = GND) IIN VIN = 10V VOH IOH = -400 A VOL IOL = 8 mA ISC VCC = MAX, VOUT = 0V VIN = -10V 3.25 mA -3.25 mA 2.5 V -15 0.5 V -100 mA DRIVER VIH 2.0 V VIL 0.8 V IIL VCC = MAX, VIN = 0.4V -200 A IIH VCC = MAX, VIN = 2.7V 20 A II VCC = MAX, VIN = 7.0V 100 A VCL VCC = MIN, IIN = -18 mA VOH VCC = MIN, IOH = -20 mA VOL VCC = MIN, IOL = +20 mA 0.5 V IOFF VCC = 0V, V 100 A OUT -40 -1.5 2.5 = 5.5V |VT| - |VT | 0.4 VT 2.0 |VOS - VOS | ISC VCC = MAX, VOUT = 0V -30 V V V V 0.4 V -150 mA 35 mA DRIVER and RECEIVER ICC www.national.com VCC = MAX, VOUT = Logic 0 2 Figure 1(Figure 2) Symbol TpLH Conditions Min Typ Max Units 8921 8921A 8921AT 14 22.5 20 20 ns 14 22.5 20 20 ns 0.5 5 3.5 5 ns CL = 30 pF (Figures 1, 2 ) TpHL CL = 30 pF (Figures 1, 2) |TpLH-T pHL| CL = 30 pF (Figures 1, 2 ) Driver Switching Characteristics SINGLE ENDED CHARACTERISTICS (Figures 3, 4) Symbol TpLH Conditions Min Typ CL = 30 pF Max Units 8921 8921A 8921AT 10 15 15 15 ns 10 15 15 15 ns 5 8 8 9.5 ns 5 8 8 9.5 ns 1 5 3.5 3.5 ns (Figures 3, 4) TpHL CL = 30 pF (Figures 3, 4) TTLH CL = 30 pF (Figures 7, 8) TTHL CL = 30 pF (Figures 7, 8) Skew CL = 30 pF (Figures 3, 4) Driver Switching Characteristics(Note 6) DIFFERENTIAL CHARACTERISTICS (Figures 3, 5) Symbol TpLH Conditions Min CL = 30 pF Typ Max Units 8921 8921A 8921AT 10 15 15 15 ns 10 15 15 15 ns 0.5 6 2.75 2.75 ns (Figures 3, 5, 6) TpHL CL = 30 pF (Figures 3, 5, 6) |TpLH-T pHL| CL = 30 pF (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 = 25C. 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: Tcr = Crossing Point Tra, Trb, Tfa and T fb are time measurements with respect to the input. See Figure 6 . 3 www.national.com DS8921/DS8921A/DS8921AT Receiver Switching Characteristics DS8921/DS8921A/DS8921AT AC Test Circuits and Switching Diagrams 00851207 FIGURE 5. 00851203 FIGURE 1. 00851202 FIGURE 6. 00851204 FIGURE 2. 00851210 00851205 FIGURE 7. FIGURE 3. 00851211 FIGURE 8. 00851206 FIGURE 4. www.national.com 4 DS8921/DS8921A/DS8921AT Typical Applications ST506 and ST412 Application 00851208 ESDI Application 00851209 5 www.national.com DS8921/DS8921A/DS8921AT Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS8921M, DS8921AM or DS8921ATM NS Package Number M08A Molded Dual-In-Line Package (N) Order Number DS8921N, DS8921AN or DS8921ATN NS Package Number N08E www.national.com 6 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. For the most current product information visit us at www.national.com. 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