DS3862 Octal High Speed Trapezoidal Bus Transceiver General Description Features The DS3862 is an octal high speed schottky bus transceiver intended for use with terminated 120Ω impedance lines. It is specifically designed to reduce noise in unbalanced transmission systems. The open collector drivers generate precise trapezoidal waveforms with rise and fall times of 9 ns (typical), which are relatively independent of capacitive loading conditions on the outputs. This reduces noise coupling to the adjacent lines without any appreciable impact on the maximum data rate obtainable with high speed bus transceivers. In addition, the receivers use a low pass filter in conjunction with a high speed comparator, to further enhance the noise immunity. Tightly controlled threshold levels on the receiver provide equal rejection to both negative and positive going noise pulses on the bus. The external termination is intended to be a 180Ω resistor from the bus to 5V logic supply, together with a 390Ω resistor from the bus to ground. The bus can be terminated at one or both ends. n Guaranteed A.C. specifications on noise immunity and propagation delay over the specified temperature and supply voltage range n Temperature insensitive receiver thresholds track bus logic level and respond symmetrically to positive and negative going pulses n Trapezoidal bus waveforms reduce noise coupling to adjacent lines n Open collector driver output allows wire-or connection n Advanced low power schottky technology n Glitch free power up/down protection on driver and receiver outputs n TTL compatible driver and control inputs, and receiver outputs n Control logic is the same as the DS3896 Logic and Connection Diagram DS008539-1 Order Number DS3862J, DS3862N or DS3862WM See NS Package Number J20A, N20A or M20B © 1999 National Semiconductor Corporation DS008539 www.national.com DS3862 Octal High Speed Trapezoidal Bus Transceiver February 1995 Absolute Maximum Ratings (Note 1) Storage Temperature Range −65˚C to +150˚C Lead Temperature (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 Control Input Voltage Driver Input and Receiver Output Receiver Input and Driver Output Power Dissipation Recommended Operating Conditions 6V 5.5V 5.5V 5.5V 1400 mW Supply Voltage,VCC Operating Free Air Temperature Min 4.75 0 Max 5.25 70 Units V ˚C Typ Max Units Electrical Characteristics (Notes 2, 3) 0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified Symbol Parameter Conditions Min Driver and Control Inputs: VIH Logical “1” Input Voltage VIL Logical “0” Input Voltage II Logical “1” Input Current IIH Logical “1” Input Current IIHC Logical “1” Input Current IIL Logical “0” Input Current IILC CD & T/R Logical “0” Input Current VCL Input Diode Clamp Voltage 2.0 An = VCC An = 2.4V CD = T/R = 2.4V An = 0.4V CD = T/R = 0.4V Iclamp = −12 mA V 0.8 V 1 mA 40 µA 80 µA −1 −1.6 mA −180 −400 µA −0.9 −1.5 V Driver Output/Receiver Input VOLB Low Level Bus Voltage IIHB Logical “1” Bus Current IILB Logical “0” Bus Current VTH Input Threshold An = T/R = 2V, Ibus = 100 mA An = 0.8V, Bn = 4V, VCC = 5.25V and 0V An = 0.8V, Bn = 0V, VCC = 5.25V and 0V VCC = 5V 1.5 0.6 0.9 V 10 100 µA 100 µA 1.9 V 1.7 Receiver Output VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage IOS Output Short Circuit Current Bn = 0.9V, Ioh = − 400µA Bn = 4V, Iol = 16 mA Bn = 0.9V ICC Supply Current VCC = 5.25V 2.4 −20 3.2 V 0.35 0.5 V −70 −100 mA 90 135 mA Note 1: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that device should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: All typicals are given for VCC = 5V and TA = 25˚C. Switching Characteristics 0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified Symbol Parameter Conditions Min Typ Max Units 12 20 ns 12 20 ns 12 20 ns 15 25 ns 20 30 ns 25 40 ns 4 9 20 ns 4 9 20 ns Driver: tDLH An to Bn CD = 0.8V, T/R = 2.0V, VL = 5V (Figure 1) tDHL tDLHC CD to Bn An = T/R = 2.0V, VL = 5V, (Figure 1) tDHLC tDLHT T/R to Bn tDHLT tR Driver Output Rise Time tF Driver Output Fall Time www.national.com VCI = An, VC = 5V, (Figure 2) CD = 0.8V, RC = 390Ω, CL = 30 pF RL1 = 91Ω, RL2 = 200Ω, VL = 5V CD = 0.8V, T/R = 2V, VL = 5V 2 (Figure 1) Switching Characteristics (Continued) 0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified Symbol Parameter Conditions Min Typ Max Units 15 25 ns 15 25 ns 15 25 ns 10 20 ns 5 10 ns 8 15 ns 20 30 ns 30 45 ns 5 10 ns 10 20 ns Receiver: tRLH Bn to An CD = 0.8V, T/R = 0.8V (Figure 3) tRHL tRZLC Bn = 2.0V, T/R = 0.8V, CL = 5 pF RL1 = 390Ω, RL2 = NC, VL = 5V (Figure 4) Bn = 2.0V, T/R = 0.8V, CL = 30 pF (Figure 4) tRHZC RL1 = 390Ω, RL2 = 1.6K, VL = 5V Bn = 0.8V, T/R = 0.8V, VL = 0V, (Figure 4) tRZHC RL1 = 390Ω, RL2 = NC, CL = 5 pF Bn = 0.8V, T/R = 0.8V, VL = 0V, (Figure 4) tRLZT RL1 = NC, RL2 = 1.6K, CL = 30 pF VCI = Bn, VC = 3.4V, RC = 39Ω tRLZC CD to An T/R to An CD = 0.8V, VL = 5V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 2 ) VCI = Bn, VC = 3.4V, RC = 39Ω, CD = 0.8V, VL = 5V, RL1 = 390Ω, RL2 = 1.6K, CL = 30 pF (Figure 2 ) VCI = Bn, VC = 0V, RC = 39Ω tRZLT tRHZT CD = 0.8V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 2 ) VCI = Bn, VC = 0V, RC = 39Ω, CD = 0.8V, VL = 0V, RL1 = NC tRZHT RL2 = 1.6K, CL = 30 pF tNR (Figure 2) (Figure 5) Receiver Noise Rejection 9 12 ns Pulse Width Note: NC means open Switching Waveforms DS008539-2 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 1. Driver Propagation Delays 3 www.national.com Switching Waveforms (Continued) DS008539-3 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 2. Propagation Delay From T/R Pin to An or Bn. DS008539-4 Note: tR = tF ≤ 10 ns from 10% to 90% FIGURE 3. Receiver Propagation Delays www.national.com 4 Switching Waveforms (Continued) DS008539-5 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 4. Propagation Delay From CD Pin to An DS008539-6 Note: tr = tf = 2 ns from 10% to 90% FIGURE 5. Receiver Noise Immunity: No Response at Output Input Waveform. Typical Application DS008539-7 5 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS3862J NS Package J20A 20-Lead Molded Small Outline Package (M) Order Number DS3862WM NS Package M20B www.national.com 6 DS3862 Octal High Speed Trapezoidal Bus Transceiver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS3862N NS Package N20A 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. 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 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. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 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.