DS3890 BTL Octal Trapezoidal Driver DS3892 BTL Octal TRI-STATEÉ Receiver General Description The DS3890 and DS3898 are designed specifically to overcome problems associated with driving densely populated backplanes. These products provide significant improvement in both speed and data integrity in comparison to conventional bus drivers and receivers. Their low output capacitance, low voltage swing and noise immunity features make them ideal for driving low impedance busses with minimum power dissipation. The DS3890 features an open collector outputs that generate precise trapezoidal waveforms with typical rise and fall times of 6 ns which are relatively independent of capacitive loading conditions. These controlled output characteristics significantly reduce noise coupling to adjacent lines. To minimize bus loading, the DS3890 also features a schottky diode in series with the open collector outputs that isolates the driver output capacitance in the disabled state. With this type of configuration the output low voltage is typically ‘‘1V’’. The output high level is intended to be 2 volts. This is achieved by terminating the bus with a pull up resistor. Both devices can drive an equivalent DC load of 18.5X (or greater) in the defined configuration. (General Description to be continued) Features Y Y Y Y Y Y Y Y Y Driver output capacitance less than 5 pF 1 volt bus signal reduces power consumption Trapezoidal driver waveforms (tr, tf, typically 6 ns) reduces noise coupling to adjacent lines Precise receiver threshold track the bus logic high level to maximize noise immunity in both logic high ahd low states Open collector driver output allows wire-or connection Advanced low power schottky technology Glitch free power up/down protection TTL compatible driver and control inputs and receiver output BTL compatible Logic and Connection Diagrams DS3890 Octal Trapezoidal Driver DS3892 Octal TRI-STATE Receiver TL/F/8700 – 1 TL/F/8700 – 2 Order Numbers DS3892M, DS3890N or DS3892N See NS Package Number M20B or N20A TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/8700 RRD-B30M36/Printed in U. S. A. http://www.national.com DS3890 BTL Octal Trapezoidal Driver/DS3892 BTL Octal TRI-STATE Receiver January 1996 Absolute Maximum Ratings (Note 1) Recommended Operating Conditions 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 Storage Temperature Range Lead Temperature (Soldering, 4 sec.) Supply Voltage Temperature (TA) 6V 5.5V 5.5V 2.5V b 65§ C to a 165§ C 260§ C Min 4.75 0 Max 5.25 70 Units V §C DS3890 Electrical Characteristics (Notes 2 and 3) DRIVER AND CONTROL INPUTS Symbol Conditions Min VIH Typ Max Units 0.8 V 2.0 V VIL IIL An VCC e Max VIN e 0.4V b1 b 1.6 mA IIL Dis VCC e Max VIN e 0.4V b 180 b 400 mA IIH VCC e Max VIN e 2.4V 40 mA II VCC e Max VIN e 5.25V 1 mA VCL VCC e Min IIN eb12 mA b 1.5 V VOL VCC e Min RL e 18.5X 0.75 1.0 1.2 V IOH VCC e Max VOUT e 2V b 20 10 100 mA IO VCC e 0V 100 mA IIL VCC e Max b 100 b 250 mA b 0.9 DRIVER OUTPUT ICC Low ICC High VOUT e 2V VOUT e 0.75V 50 VCC e Max 80 mA 100 mA Max Units 0.8 V b 400 mA DS3892 Electrical Characteristics (Notes 2 and 3) CONTROL INPUTS Symbol Conditions Min VIH Typ 2.0 V VIL IIL VCC e Max VIN e 0.4V IIH VCC e Max VIN e 2.4V b 180 40 mA II VCC e Max VIN e 5.25V 1 mA VCL VCC e Min IIN eb12 mA b 0.9 b 1.5 V VOL VCC e Min IOL e 16 mA 0.35 0.5 VOH VCC e Min IOH eb400 mA IOS VCC e Max VOUT e 0V VTH Rec VCC e 5V IIH Rec VCC e Max II Rec VCC e 0V IIL Rec VCC e Max RECEIVER ICC Low ICC High http://www.national.com VIN e 2V VIN e 2V VIN e 0.75V VCC e Max 2 V 2.4 3.2 V b 20 b 70 b 100 1.47 1.55 1.62 V 10 100 mA 100 mA mA 100 mA 80 mA 60 mA DS3890 Switching Characteristics (Figure 1) 0§ CsTAs70§ C, 4.75VsVCCs5.25V unless otherwise specified Symbol Typ Max 9 15 ns 9 15 ns 10 18 ns 12 20 ns 6 10 ns Typ Max Units 12 18 ns TpHL 10 18 ns TdLZ 10 18 ns TdZL 8 15 ns TdHZ 4 8 ns TdZH 7 12 ns TdLH Conditions Min An to Bn TdHL TdLH Dis to Bn TdHL Tr & Tf Bn rise and fall time 3 Units DS3892 Switching Characteristics (Figures 2, 3 and 4 ) Symbol TdLH TNR Conditions Min Bn to An Dis to An Receiver noise rejection 3 6 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 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 and apply to the full operating temperature and VCC range. Note 3: All typical values are VCC e 5V, TA e 25§ C. 3 http://www.national.com General Descriptions (Continued) The DS3892 receiver inputs incorporate a low pass filter in conjunction with high speed comparator to further enhance the noise immunity. Both devices provide equal rejection to both positive and negative noise pulses (typically 6 ns) on the bus. The DS3890 features TTL compatible inputs while the DS3892 inputs are BTL compatible. The control inputs on all devices are TTL compatible. BTL ‘‘Backplane Transceiver Logic’’ is a new logic signaling method developed by IEEE P896 Future Bus Stan- dards Committee. This standard was adopted to enhance the performance of Backplane Busses. BTL compatible bus interface circuits feature low capacitance drivers to minimize bus loading, a 1V nominal signal swing for reduced power consumption and receivers with precision thresholds for maximum noise immunity. This new standard overcomes some of the fundamental limitations of TTL bus transceivers in heavily loaded backplane bus applications. Devices designed to this standard provide significant improvements in switching speed and data integrity. AC Switching Waveforms TL/F/8700 – 4 Note: tR e tF k 10 ns from 10% to 90% TL/F/8700 – 5 FIGURE 1 Driver Propagation Delays http://www.national.com 4 AC Switching Waveforms (Continued) TL/F/8700 – 6 Note: tR e tF k 10 ns from 10% to 90% TL/F/8700 – 7 FIGURE 2. Receiver Propagation Delays TL/F/8700 – 8 tDLZ tDZL TL/F/8700 – 14 Note: tR e tF k 5 ns from 10% to 90% tDHZ Note: tR e tF k 5 ns from 10% to 90% TL/F/8700 – 9 tDZH TL/F/8700 – 15 TL/F/8700 – 16 FIGURE 3. Propagation Delay from Disable Pin to An 5 http://www.national.com AC Switching Waveforms (Continued) TL/F/8700 – 10 High Low Note: tR e tF k 2 ns from 10% to 90% TL/F/8700 – 11 FIGURE 4 Receiver Noise Immunity: ‘‘No Response at Output’’ Input Waveforms http://www.national.com 6 Physical Dimensions inches (millimeters) Order Number DS3892M NS Package Number M20B 7 http://www.national.com DS3890 BTL Octal Trapezoidal Driver/DS3892 BTL Octal TRI-STATE Receiver Physical Dimensions inches (millimeters) (Continued) Order Numbers DS3890N or DS3892N NS Package Number 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 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 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 http://www.national.com 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 Europe Fax: a49 (0) 180-530 85 86 Email: europe.support @ nsc.com Deutsch Tel: a49 (0) 180-530 85 85 English Tel: a49 (0) 180-532 78 32 Fran3ais Tel: a49 (0) 180-532 93 58 Italiano Tel: a49 (0) 180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2308 Fax: 81-043-299-2408 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.