DS3662 Quad High Speed Trapezoidal™ Bus Transceiver General Description Features The DS3662 is a quad 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 15 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. A two input NOR gate is provided to disable all drivers in a package simultaneously. n Pin to pin functional replacement for DS8641 n Guaranteed AC specifications on noise immunity and propagation delay over the specified temperature and supply voltage range n Temperature insensitive receiver thresholds track bus logic level n Trapezoidal bus waveforms reduce noise coupling to adjacent lines n Precision receiver thresholds provide maximum noise immunity and symmetrical response to positive and negative going pulses n Open collector driver output allows wire-OR connection n High speed Schottky technology n 15 µA typical bus termination current with normal VCC or with VCC = 0V n Glitch free power up/down protection on the driver output n TTL compatible driver and disable inputs, and receiver outputs Block and Connection Diagram Dual-In-Line Package DS005803-1 Top View Order Number DS3662J, DS3662N or DS3662WM See NS Package Number J16A, N16A or M16B Trapezoidal™ is a trademark of National Semiconductor Corp. © 1999 National Semiconductor Corporation DS005803 www.national.com DS3662 Quad High Speed Trapezoidal Bus Transceiver July 1992 Absolute Maximum Ratings (Note 2) Lead Temperature (Soldering, 4 sec.) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 260˚C Recommended Operating Conditions Supply Voltage 7V Input and Output Voltage 5.5V Storage Temperature Range −65˚C to +150˚C Maximum Power Dissipation (Note 1) at 25˚C Cavity Package 1509 mW Molded Package 1476 mW Min 4.75 0 Supply Voltage (VCC) Temperature Range (TA) Max 5.25 70 Units V ˚C Note 1: Derate cavity package 10.1 mW/˚C above 25˚C; derate molded package 11.8 mW/˚C above 25˚C. Electrical Characteristics (Notes 3, 4) Symbol Parameter Conditions Min Typ Max Units DRIVER AND DISABLE INPUTS VIH Logical “1” Input Voltage VIL Logical “0” Input Voltage II Logical “1” Input Current IIH Logical “1” Input Current IIL Logical “0” Input Current VIN = 5.5V VIN = 2.4V VIN = 0.4V VCL Input Diode Clamp Voltage 2.0 V 0.8 V 1 mA 40 µA −1 −1.6 mA ICLAMP = −12 mA −0.8 −1.5 V VDIS = 0.8V, VIN = 2V, IBUS = 100 mA VIN = 0.8V, VBUS = 4V, VCC = 5.25V VIN = 0.8V, VBUS = 4V, VCC = 0V 0.6 0.9 V 10 100 µA 100 µA 1.50 V DRIVER OUTPUT/RECEIVER INPUT VOLB Low Level Bus Voltage IIHB Maximum Bus Current IILB Maximum Bus Current VIH High Level Receiver Threshold VIL Low Level Receiver Threshold VIN = 0.8V, VOL = 16 mA VIN = 0.8V, IOH = −400 µA 1.90 2.4 1.70 1.70 V RECEIVER OUTPUT VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage IOS Output Short Circuit Current VIN = 0.8V, VBUS = 0.5V, IOH = −400 µA VIN = 0.8V, VBUS = 4V, IOL = 16 mA VDIS = 0.8V, VIN = 0.8V, VBUS = 0.5V, ICC Supply Current VOS = 0V, VCC = 5.25V, (Note 5) VDIS = 0V, VIN = 2V −40 3.2 V 0.35 0.5 V −70 −100 mA 50 90 mA Switching Characteristics (Notes 3, 4) Symbol Parameter Conditions Min Typ Max Units 25 35 ns 25 35 ns Figure 2 20 30 ns 20 30 ns Figure 3 25 40 ns 25 40 ns 15 20 ns 20 10 ns PROPAGATION DELAYS tPLHD Disable to Bus “1” tPHLD Disable to Bus “0” tPLHB Driver Input to Bus “1” tPHLB Driver Input to Bus “0” tPLHR Bus to Logical “1” Receiver Output tPHLR Bus to Logical “0” Receiver Output Figure 1 NOISE IMMUNITY trB, tfB Rise and Fall Times (10%–90%) Figure 2 10 of the Driver Output tnR Receiver Noise Rejection No Response at Receiver Pulse Width Output as per Figure 4 Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The tables of “Electrical Characteristics” and “Recommended Operating Conditions” provide conditions for actual device operation. Note 3: Unless otherwise specified min/max limits apply across the supply and temperature range listed in the table of “Recommended Operating Conditions”. All typical values are for TA = 25˚C and VCC = 5V. Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. www.national.com 2 Switching Characteristics (Notes 3, 4) (Continued) Note 5: Only one output at a time should be shorted. AC Test Circuits and Switching Waveforms DS005803-2 DS005803-3 Note: tr = tf = 2.5 ns. Pulse width = 500 ns measured between 1.5V levels. f = 1 MHz. FIGURE 1. Disable Delays DS005803-4 DS005803-5 Note: tr = tf = 2.5 ns. Pulse width = 500 ns measured between 1.5V levels. f = 1 MHz. FIGURE 2. Driver Propagation Delays DS005803-6 DS005803-7 Note: tr = tf = 15 ns. Pulse width = 500 ns measured between 1.7V levels. f = 1 MHz. FIGURE 3. Receiver Propagation Delays 3 www.national.com AC Test Circuits and Switching Waveforms (Continued) DS005803-8 DS005803-10 DS005803-9 tr = tf = 2.5 ns tr = tf = 2.5 ns (b) Receiver Output (VO) to Remain Less than 0.7V (a) Receiver Output (VO) to Remain Greater than 2.2V FIGURE 4. Receiver Noise Immunity: “No Response at Output” Input Waveforms Typical Application DS005803-11 www.national.com 4 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS3662J NS Package Number J16A 16-Lead Molded Small Outline Package (M) Order Number DS3662WM NS Package Number M16B 5 www.national.com DS3662 Quad High Speed Trapezoidal Bus Transceiver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS3662N NS Package Number N16A 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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