Low Voltage Bidirectional Transceiver

www.DataSheet4U.com 54LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs December 1998 54LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs General Description The LCX245 contains eight non-inverting bidirectional buffers with TRI-STATE™ outputs and is intended for bus oriented applications. The device is designed for low voltage (3.3V) VCC applications with capability of interfacing to a 5V signal environment. The T/R input determines the direction of data flow through the device. The OE input disables both the A and B ports by placing them in a high impedance state. The LCX245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. Features n n n n n n n n n 5V tolerant inputs and outputs 9ns tPD max, 10µA ICCQ max Power down high impedance inputs and outputs Supports live insertion/withdrawal 2.0V–3.6V VCC supply operation ± 24 mA output drive Implements patented noise/EMI reduction circuitry Functionally compatible with the 54 series 245 ESD performance: Human body model > 2000V Machine model > 200V n Standard Microcircuit Drawing (SMD) 5962-97543 Logic Symbols Connection Diagram Pin Assignment for DIP and Cerpack DS101022-1 Pin Descriptions Pin Names OE T/R A0–A7 B0–B7 Description Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs DS101022-3 Pin Assignment for LCC DS101022-6 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS101022 www.national.com Truth Table Inputs OE L L H T/R L H X Bus B0–B7 Data to Bus A0–A7 Bus A0–A7 Data to Bus B0–B7 HIGH Z State on A0–A7, B0–B7 (Note 1) Outputs H = High Voltage Level L = Low Voltage Level X = Immaterial Z = High Impedance Note 1: Unused bus terminals during HIGH Z State must be held HIGH or LOW. Logic Diagram DS101022-4 www.national.com 2 Absolute Maximum Ratings (Note 2) 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 (VI) DC Input Diode Current (IIK) VI < GND DC Output Diode Current (IOK) VO < GND VO ≥ VCC DC Output Voltage (VO) Output in High or Low State Output in TRI-STATE DC Output Source or Sink Current (IO) DC VCC or Ground Current Storage Temperature Range (TSTG) Junction Temperature (TJ) CDIP −0.5V to +7.0V −0.5V to +7.0V −50 mA −50mA +50mA -0.5V to VCC + 0.5V -0.5V to 7.0V Recommended Operating Conditions (Note 3) Supply Voltage (VCC) Operating Data Retention Input Voltage (VI) Output Voltage (VO) High or Low State TRI-STATE Operating Temperature (TA) 54LCX Minimum Input Edge Rate (∆t/∆V) VIN from 0.8V to 2.0V, VCC = 3.0V 2.0V to 3.6V 1.5V to 3.6V 0V to 5.5V 0V to VCC 0V to 5.5V −55˚C to +125˚C 0ns/V to 10ns/V ± 50mA ± 200mA −65˚C to +150˚C 175˚C Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Note 3: IO Absolute Maximum Rating must be observed. DC Electrical Characteristics Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = −100 µA IOH = −12 mA IOH = −12 mA IOH = −24 mA VOL LOW Level Output Voltage IOL = 100 µA IOL = 12 mA IOL = 24 mA II VIKL IOZ ICCZ IOFF ICC ∆ICC Input Leakage Current Clamp Diode Voltage TRI-STATE I/O Leakage Supply Current Outputs TRI-STATE Power-Off Leakage Current Quiescent Supply Current Increase in ICC per Input 0 ≤ VI ≤ 5.5V IM = -18mA 0 ≤ VO ≤ 5.5V VI = VIH or VIL VI = 5.5V or GND VCC = 0V, VI = 0V, VM 5.5V VI = VCC or GND VIH = VCC −0.6V = 2.7-3.6 0 2.7-3.6 2.7–3.6 10 100 10 0.5 µA µA µA mA Conditions VCC (V) 2.7–3.6 2.7–3.6 2.7–3.6 2.7 3.0 3.0 2.7–3.6 2.7 3.0 2.7–3.6 3.0 2.7–3.6 VCC − 0.2 2.2 2.4 2.2 0.2 0.4 0.55 TA = −55˚C to +125˚C Min 2.0 0.8 Max V V V V V V V V V µA V µA Units ± 5.0 -1.2 ± 5.0 3 www.national.com AC Electrical Characteristics Symbol Parameter Min tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Notes 4, 5) Output Disable Time Propagation Delay An to Bn or Bn to An Output Enable Time 1.5 1.5 1.5 1.5 1.5 1.5 TA = −55˚C to +125˚C, CL = 50pF, RL = 500Ω VCC = 3.3V ± 0.3V Max 8.0 8.0 10.0 10.0 8.0 8.0 1.0 1.0 Min 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.7V Max 9.0 9.0 11.0 11.0 9.0 9.0 1.0 1.0 ns ns ns ns Units Note 4: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH to LOW (tOSHL) or LOW to HIGH (tOSLH). Note 5: Guaranteed but not tested (design characterization data). Dynamic Switching Characteristics Symbol VOLP VOLV Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions CL = 50 pF, VIH = 3.0V, VIL = 0V CL = 50 pF, VIH = 3.0V, V IL VCC (V) 3.0 3.0 = 0V TA = 25˚C Max 1.0 -0.8 Units V V Capacitance Symbol CIN CI/O CPD Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, f = 10 MHz Max 10 12 30 Units pF pF pF www.national.com 4 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Dual-in-line Package Number J20A 20-Lead Cerpack Package Number W20A 5 www.national.com 54LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Leadless Chip Carrier Package Number E20A 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. 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