DS26C31T/DS26C31M CMOS Quad TRI-STATE ® Differential Line Driver General Description The DS26C31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26C31T meets all the requirements of EIA standard RS-422 while retaining the low power characteristics of CMOS. The DS26C31M is compatible with EIA standard RS-422; however, one exception in test methodology is taken (Note 8). This enables the construction of serial and terminal interfaces while maintaining minimal power consumption. The DS26C31 accepts TTL or CMOS input levels and translates these to RS-422 output levels. This part uses special output circuitry that enables the drivers to power down without loading down the bus. This device has enable and disable circuitry common to all four drivers. The DS26C31 is pin compatible to the AM26LS31 and the DS26LS31. All inputs are protected against damage due to electrostatic discharge by diodes to VCC and ground. Features n n n n n n n n n n TTL input compatible Typical propagation delays: 6 ns Typical output skew: 0.5 ns Outputs will not load line when VCC = 0V DS26C31T meets the requirements of EIA standard RS-422 Operation from single 5V supply TRI-STATE outputs for connection to system buses Low quiescent current Available in surface mount Mil-Std-883C compliant Connection Diagrams 20-Lead Ceramic Leadless Chip Carrier (E) Dual-In-Line Package DS008574-1 Top View Order Number DS26C31TM or DS26C31TN See NS Package Number M16A or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26C31ME/883, DS26C31MJ/883 or DS26C31MW/883 See NS Package Number E20A, J16A or W16A DS008574-12 Truth Table ENABLE ENABLE L H Input Non-Inverting Inverting Output Output X Z Z All other L L H combinations of H H L enable inputs L = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE (high impedance) TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT™ is a trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS008574 www.national.com DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver June 1998 Absolute Maximum Ratings (Notes 1, 2) Max. Power Dissipation (PD) @25˚C (Note 3) Ceramic “J” Pkg. 2419 mW Plastic “N” Pkg. 1736 mW SOIC “M” Pkg. 1226 mW Ceramic “W” Pkg. 1182 mW Ceramic “E” Pkg. 2134 mW Lead Temperature (TL) (Soldering, 4 sec.) 260˚C This device does not meet 2000V ESD Rating. (Note 13) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK, IOK) DC Output Current, per pin (IOUT) DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) −0.5V to 7.0V −1.5V to VCC +1.5V −0.5V to 7V ± 20 mA ± 150 mA Operating Conditions ± 150 mA −65˚C to +150˚C Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) DS26C31T DS26C31M Input Rise or Fall Times (tr, tf) Min 4.50 Max 5.50 Units V 0 VCC V −40 −55 +85 +125 500 ˚C ˚C ns DC Electrical Characteristics VCC = 5V ± 10% (unless otherwise specified) (Note 4) Symbol Parameter VIH High Level Input Voltage VIL Low Level Input Voltage VOH High Level Output Voltage VOL VT VOS VIN = VIH or VIL, Difference In Common Mode Output Voltage |VOS − VOS | VIN = VIH or VIL, IOUT = −20 mA IOUT = 20 mA RL = 100Ω Differential Output Difference In Common Mode Output IIN Input Current ICC Quiescent Supply Current (Note 6) ISC www.national.com 2.5 3.4 0.3 2.0 (Note 5) RL = 100Ω 1.8 (Note 5) VIN = VCC, GND, VIH, or VIL DS26C31T VIN = VCC or GND IOUT = 0 µA VIN = 2.4V or 0.5V (Note 6) VIN = VCC or GND VIN = 2.4V or 0.5V Leakage Current Output Short ENABLE = VIH VIN = VCC or GND Circuit Current (Notes 5, 7) 2 −30 Units V V 0.5 3.1 (Note 5) RL = 100Ω (Note 6) VOUT = VCC or GND ENABLE = VIL TRI-STATE Output Max V (Note 5) RL = 100Ω DS26C31M IOUT = 0 µA IOZ Typ 0.8 Low Level Output Differential Output Min 2.0 Voltage Voltage |VT| − |VT | Conditions V V 0.4 V 3.0 V 0.4 V ± 1.0 µA 200 500 µA 0.8 2.0 mA 200 500 µA 0.8 2.1 mA ± 0.5 ± 5.0 µA −150 mA DC Electrical Characteristics (Continued) VCC = 5V ± 10% (unless otherwise specified) (Note 4) Symbol Parameter Output Leakage Current IOFF Power Off (Note 5) DS26C31T VCC = 0V Conditions VOUT = 6V Min Typ Max VOUT = −0.25V VOUT = 6V VOUT = 0V DS26C31M VCC = 0V Units 100 µA −100 µA 100 µA −100 µA (Note 8) 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” provide conditions for actual device operation. Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive, all currents out of device pins are negative. Note 3: Ratings apply to ambient temperature at 25˚C. Above this temperature derate N package at 13.89 mW/˚C, J package 16.13 mW/˚C, M package 9.80 mW/˚C, E package 12.20 mW/˚C, and W package 6.75 mW/˚C. Note 4: Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC = 5V and TA = 25˚C. Note 5: See EIA Specification RS-422 for exact test conditions. Note 6: Measured per input. All other inputs at VCC or GND. Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted. Note 8: The DS26C31M (−55˚C to +125˚C) is tested with VOUT between +6V and 0V while RS-422A condition is +6V and −0.25V. Switching Characteristics VCC = 5V ± 10%, tr ≤ 6 ns, tf ≤ 6 ns (Figures 1, 2, 3, 4) (Note 4) Symbol tPLH, tPHL Parameter Propagation Delays Conditions Min S1 Open Typ 2 Max Units DS26C31T CS26C31M 6 11 14 ns Input to Output Skew (Note 9) S1 Open 0.5 2.0 3.0 ns tTLH, tTHL Differential Output Rise S1 Open 6 10 14 ns ns And Fall Times tPZH Output Enable Time S1 Closed 11 19 22 tPZL Output Enable Time S1 Closed 13 21 28 ns tPHZ Output Disable Time S1 Closed 5 9 12 ns S1 Closed 7 11 14 ns (Note 10) tPLZ Output Disable Time (Note 10) CPD Power Dissipation 50 pF 6 pF Capacitance (Note 11) CIN Input Capacitance Note 9: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. Note 10: Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times are less than indicated due to the delay added by the RC time constant of the load. Note 11: CPD determines the no load dynamic power consumption, PD = CPD VCC2 f + ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f + ICC. Comparison Table of Switching Characteristics into “LS-Type” Load VCC = 5V, TA = 25˚C, tr ≤ 6 ns, tf ≤ 6 ns (Figures 2, 4, 5, 6) (Note 12) Symbol tPLH, tPHL Skew Parameter Conditions Propagation Delays CL = 30 pF Input to Output S1 Closed (Note 9) S2 Closed CL = 30 pF S1 Closed DS26C31T DS26LS31C Units Typ Max Typ Max 6 8 10 15 ns 0.5 1.0 2.0 6.0 ns S2 Closed 3 www.national.com Comparison Table of Switching Characteristics into “LS-Type” Load (Continued) VCC = 5V, TA = 25˚C, tr ≤ 6 ns, tf ≤ 6 ns (Figures 2, 4, 5, 6) (Note 12) Symbol tTHL, tTLH tPLZ tPHZ tPZL Parameter Conditions Differential Output Rise CL = 30 pF and Fall Times S1 Closed Output Disable Time S2 Closed CL = 10 pF (Note 10) S1 Closed Output Disable Time S2 Open CL = 10 pF (Note 10) S1 Open Output Enable Time S2 Closed CL = 30 pF S1 Closed tPZH Output Enable Time DS26C31T DS26LS31C Typ Units Typ Max Max 4 6 6 9 15 35 ns 4 7 15 25 ns 14 20 20 30 ns 11 17 20 30 ns ns S2 Open CL = 30 pF S1 Open S2 Closed Note 12: This table is provided for comparison purposes only. The values in this table for the DS26C31 reflect the performance of the device but are not tested or guaranteed. Note 13: ESD Rating: HBM (1.5 kΩ, 100 pF) Inputs ≥ 1500V Outputs ≥ 1000V EIAJ (0Ω, 200 pF) ≥ 350V Logic Diagram DS008574-2 AC Test Circuit and Switching Time Waveforms DS008574-3 Note: C1 = C2 = C3 = 40 pF (Including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω. FIGURE 1. AC Test Circuit www.national.com 4 AC Test Circuit and Switching Time Waveforms (Continued) DS008574-4 FIGURE 2. Propagation Delays DS008574-5 FIGURE 3. Enable and Disable Times DS008574-7 Input pulse; f = 1 MHz, 50%; tr ≤ 6 ns, tf ≤ 6 ns FIGURE 4. Differential Rise and Fall Times 5 www.national.com AC Test Circuit and Switching Time Waveforms (Continued) DS008574-6 FIGURE 5. Load AC Test Circuit for “LS-Type” Load DS008574-8 FIGURE 6. Enable and Disable Times for “LS-Type” Load Typical Applications Two-Wire Balanced System, RS-422 DS008574-9 *RT is optional although highly recommended to reduce reflection. www.national.com 6 Typical Performance Characteristics Differential Propagation Delay vs Temperature Differential Propagation Delay vs Power Supply Voltage Differential Skew vs Temperature DS008574-16 DS008574-14 Differential Skew vs Power Supply Voltage DS008574-15 Differential Transition Time vs Temperature DS008574-17 Complementary Skew vs Temperature Differential Transition Time vs Power Supply Voltage DS008574-18 Complementary Skew vs Power Supply Voltage DS008574-20 Differential Output Voltage vs Output Current DS008574-21 7 DS008574-19 DS008574-22 www.national.com Typical Performance Characteristics Differential Output Voltage vs Output Current (Continued) Output High Voltage vs Output High Current DS008574-24 DS008574-23 Output Low Voltage vs Output Low Current Output Low Voltage vs Output Low Current DS008574-26 Supply Current vs Power Supply Voltage DS008574-25 Supply Current vs Temperature DS008574-27 No Load Supply Current vs Data Rate 8 DS008574-28 Loaded Supply Current vs Data Rate DS008574-30 DS008574-29 www.national.com Output High Voltage vs Output High Current DS008574-31 Typical Performance Characteristics (Continued) Output Short Circuit Current vs Temperature Output Short Circuit Current vs Power Supply Voltage DS008574-32 DS008574-33 9 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier (E) Order Number DS26C31ME/883 NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number DS26C31MJ/883 NS Package Number J16A www.national.com 10 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Package Small Outline (M) Order Number DS26C31TM NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DS26C31TN NS Package Number N16E 11 www.national.com DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Ceramic Flatpak Package (W) Order Number DS26C31MW/883 NS Package Number W16A 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] 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: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 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.