DS3896/DS3897 BTL Trapezoidal™ Transceivers General Description These advanced transceivers are specifically designed to overcome problems associated with driving a densely populated backplane, and thus provide significant improvement in both speed and data integrity. Their low output capacitance, low output signal swing and noise immunity features make them ideal for driving low impedance buses with minimum power consumption. The DS3896 is an octal high speed schottky bus transceiver with common control signals, whereas the DS3897 is a quad device with independent driver input and receiver output pins. The DS3897 has a separate driver disable for each driver and is, therefore, suitable for arbitration lines. The separate driver disable pins (En) feature internal pull ups and may be left open if not required. On the other hand, the DS3896 provides high package density for data/address lines. The open collector drivers generate precise trapezoidal waveforms, which are relatively independent of capacitive loading conditions on the outputs. This significantly reduces noise coupling to adjacent lines. In addition, the receivers use a low pass filter in conjunction with a high speed comparator, to further enhance the noise immunity and provide equal rejection to both negative and positive going noise pulses on the bus. To minimize bus loading, these devices also feature a schottky diode in series with the open collector output that isolates the driver output capacitance in the disabled state. The output low voltage is typically “1V” and the output high level is intended to be 2V. This is achieved by terminating the bus with a pull up resistor to 2V at both ends. The device can drive an equivalent DC load of 18.5Ω (or greater) in the above configuration. These signalling requirements, including a 1 volt signal swing, low output capacitance and precise receiver thresholds are referred to as Bus Transceiver Logic (BTL). Features n 8 bit DS3896 transceiver provides high package density n 4 bit DS3897 transceiver provides separate driver input and receiver output pins n BTL compatible n Less than 5 pF output capacitance for minimal bus loading n 1 Volt bus signal swing reduces power consumption n Trapezoidal driver waveforms (tr, tf ≅ 6 ns typical) reduce noise coupling to adjacent lines n Temperature insensitive receiver thresholds track the bus logic high level to maximize noise immunity in both high and low states n Guaranteed A.C. specifications on noise immunity and propagation delay over the specified temperature and supply voltage range 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 Logic Diagrams DS3896N, M DS3897N, M DS008510-1 DS008510-2 Order Numbers DS3896M, DS3896N, DS3897M or DS3897N See NS Package Number M20B or N20A Trapezoidal™ is a trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS008510 www.national.com DS3896/DS3897 BTL Trapezoidal Transceivers January 1996 Absolute Maximum Ratings (Note 1) Storage Temperature Range Lead Temperature (Soldering, 4 sec.) 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 at 70˚C N Package M Package −65˚C to +150˚C 260˚C Recommended Operating Conditions 6V 5.5V 5.5V 2.5V 1480 mW TBD mW Supply Voltage, VCC Bus Termination Voltage Operating Free Air Temperature Min 4.75 1.90 0 Max 5.25 2.10 70 Units V V ˚C Electrical Characteristics: (Notes 2, 3) (0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units Driver and Control Inputs: (An, Dn, En, CD, T/R , RE , TE ) 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 Logical “0” Input Current VCL Input Diode Clamp Voltage 2.0 An = Dn = En = VCC An = Dn = En = 2.4V CD = T/R = RE = TE = 2.4V An = Dn = En = 0.4V CD = T/R = RE = TE = 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 1.0 1.2 V 10 100 µA 100 µA 1.62 V Driver Output/Receiver Input: (Bn) VOLB Low Level Bus Voltage IIHB Maximum Bus Current (Power On) IILB Maximum Bus Current (Power Off) VTH Receiver Input Threshold An = Dn = En = T/R = 2V, VL = 2V RL = 18.5Ω, CD = TE = 0.8V (Figure 1) An = Dn = En = 0.8V, VCC = 5.25V Bn = 2V An = Dn = En = 0.8V, VCC = 0V Bn = 2V VCC = 5V 0.75 1.47 1.55 2.4 3.2 Receiver Output: (An, Rn) VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage Bn = 1.2V, IOH = −400 µA CD = T/R = RE = 0.8V Bn = 2V, IOL = 16 mA Output Short Circuit Current CD = T/R = RE = 0.8V Bn = 1.2V ICC Supply Current (DS3896) CD = T/R = RE = 0.8V VCC = 5.25V ICC Supply Current (DS3897) VCC = 5.25V IOS −20 V 0.35 0.5 V −70 −100 mA 90 135 mA 50 80 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 the device should be operated at these limits. The table of “Electrical Characteristic” 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. DS3896 Switching Characteristics (0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 9 15 ns 5 9 15 ns Driver: tDLH An to Bn CD = 0.8V, T/R = 2.0V, VL = 2V (Figure 2) tDHL www.national.com 2 DS3896 Switching Characteristics (Continued) (0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 10 18 ns 5 12 20 ns 5 15 25 ns 5 22 35 ns 3 6 10 ns 3 6 10 ns 5 12 18 ns 5 10 18 ns 5 10 18 ns 5 8 15 ns 2 4 8 ns 3 7 12 ns 5 10 18 ns 14 24 40 ns Driver: tDLHC CD to Bn An = T/R = 2.0V, VL = 2V (Figure 2) tDHLC tDLHT T/R to Bn tDHLT tR Driver Output Rise Time tF Driver Output Fall Time VCI = An, VC = 5V, (Figure 5) CD = 0.8V, RC = 390Ω, CL = 30 pF RL1 = 18Ω, RL2 = NC, VL = 2V CD = 0.8V, T/R = 2V, VL = 2V (Figure 2) Receiver: tRLH Bn to An CD = 0.8V, T/R = 0.8V (Figure 3) tRHL tRLZC CD to An 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 tRZHC RL1 = 390Ω, RL2 = 1.6k, VL = 5V (Figure 4) Bn = 0.8V, T/R = 0.8V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 4) Bn = 0.8V, T/R = 0.8V, VL = 0V, tRLZT RL1 = NC, RL2 = 1.6k, CL = 30 pF VCI = Bn, VC = 2V, RC = 18Ω, tRHZC T/R to An (Figure 4) CD = 0.8V, VL = 5V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 5) VCI = Bn, VC = 2V, RC = 18Ω, CD = 0.8V, VL = 5V, RL1 = 390Ω, tRZLT tRHZT RL2 = 1.6k, CL = 30 pF (Figure 5) VCI = Bn, VC = 0V, RC = 18Ω, CD = 0.8V, VL = 0V, RL1 = 390Ω, 2 4 8 ns tRZHT RL2 = NC, CL = 5 pF (Figure 5) VCI = Bn, VC = 0V, RC = 18Ω, CD = 0.8V, VL = 0V, RL1 = NC 2 8 15 ns 3 6 RL2 = 1.6k, CL = 30 pF tNR (Figure 5) (Figure 6) Receiver Noise ns Rejection Pulse Width Note: NC means open DS3897 Switching Characteristics (0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 9 15 ns 5 9 15 ns An = RE = 2.0V, VL = 2V, (Figure 2) RC = 390Ω, VCI = An, VC = 5V, CL = 30 pF RL1 = 18Ω, RL2 = NC, VL = 2V (Figure 5) 5 10 18 ns 5 12 20 ns CD = 0.8V, T/R = 2V, VL = 2V 3 6 10 ns 3 6 10 ns 5 10 18 ns Driver: tDLH Dn, En to Bn TE = 0.8V, RE = 2.0V, VL = 2V (Figure 2) tDHL tDLHT TE to Bn tDHLT tR Driver Output Rise Time tF Driver Output Fall Time (Figure 2) Receiver: tRLH Bn to Rn TE = 2.0V, RE = 0.8V 3 (Figure 3) www.national.com DS3897 Switching Characteristics (Continued) (0˚C ≤ TA ≤ 70˚C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 12 18 ns 5 10 18 ns 5 8 15 ns 2 4 8 ns 3 7 12 ns 3 6 10 20 30 ns 10 20 30 ns Receiver: tRHL tRLZR RE to Rn tRZLR Bn = TE = 2V, VL = 5V, CL = 5 pF RL1 = 390Ω, RL2 = NC (Figure 4) Bn = TE = 2V, VL = 5V, CL = 30 pF RL1 = 390Ω, RL2 = 1.6k (Figure 4) Bn = 0.8V, TE = 2V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 4) Bn = 0.8V, TE = 2V, VL = 0V, tRHZR tRZHR RL1 = NC, RL2 = 1.6k, CL = 30 pF tNR (Figure 4) (Figure 6) Receiver Noise ns Rejection Pulse Width Driver plus Receiver: tDRLH Dn to Rn TE = RE = 0.8V (Figure 7) tDRHL Note: NC means open DS008510-3 FIGURE 1. Driver Output Low Voltage Test DS008510-4 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 2. Driver Propagation Delays www.national.com 4 DS3897 Switching Characteristics (Continued) DS008510-5 Note: tR = tF ≤ 10 ns from 10% to 90% FIGURE 3. Receiver Propagation Delays DS008510-6 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 4. Propagation Delay from CD pin to An 5 www.national.com DS3897 Switching Characteristics (Continued) DS008510-7 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 5. Propagation Delay from T/R pin to An or Bn DS008510-8 Note: tr = tf = 2 ns from 10% to 90% FIGURE 6. Receiver Noise Immunity: “No Response at Output” Input Waveforms www.national.com 6 DS3897 Switching Characteristics (Continued) DS008510-9 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 7. Driver Plus Receiver Delays Typical Application DS008510-10 7 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead (0.300" Wide) Molded Small Outline Package, JEDEC (M) Order Number DS3896M or DS2897M NS Package Number M20B Molded Dual-In-Line Package (N) Order Number DS3896N or DS3897N NS Package Number N20A www.national.com 8 DS3896/DS3897 BTL Trapezoidal Transceivers 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. 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. 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