54LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs General Description Features 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. n n n n n n n n n Logic Symbols Connection Diagram 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 Pin Assignment for DIP and Cerpack DS101022-1 Pin Descriptions Pin Names Description OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A Inputs or 3-STATE Outputs B0–B7 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 54LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs December 1998 Truth Table Inputs OE Outputs T/R L L L H Bus B0–B7 Data to Bus A0–A7 Bus A0–A7 Data to Bus B0–B7 H X HIGH Z State on A0–A7, B0–B7 (Note 1) 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) Recommended Operating Conditions (Note 3) 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 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 −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 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 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. ± 50mA ± 200mA −65˚C to +150˚C Note 3: IO Absolute Maximum Rating must be observed. 175˚C DC Electrical Characteristics Symbol Parameter Conditions VCC TA = −55˚C to +125˚C (V) Min 2.0 VIH HIGH Level Input Voltage 2.7–3.6 VIL LOW Level Input Voltage 2.7–3.6 VOH HIGH Level Output Voltage VOL LOW Level Output Voltage Units Max V 0.8 V IOH = −100 µA 2.7–3.6 VCC − 0.2 V IOH = −12 mA 2.7 2.2 V IOH = −12 mA 3.0 2.4 V IOH = −24 mA 3.0 2.2 IOL = 100 µA 2.7–3.6 0.2 V IOL = 12 mA 2.7 0.4 V V IOL = 24 mA 3.0 0.55 V II Input Leakage Current 0 ≤ VI ≤ 5.5V 2.7–3.6 ± 5.0 µA VIKL Clamp Diode Voltage IM = -18mA IOZ TRI-STATE I/O Leakage 0 ≤ VO ≤ 5.5V ICCZ Supply Current Outputs TRI-STATE 3.0 -1.2 V 2.7–3.6 ± 5.0 µA 2.7-3.6 10 µA 0 100 µA VI = VIH or VIL VI = 5.5V or GND = Power-Off Leakage Current VCC = 0V, VI = 0V, VM 5.5V ICC Quiescent Supply Current VI = VCC or GND 2.7-3.6 10 µA ∆ICC Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 0.5 mA IOFF 3 www.national.com AC Electrical Characteristics Symbol TA = −55˚C to +125˚C, CL = 50pF, RL = 500Ω Parameter VCC = 3.3V ± 0.3V Units VCC = 2.7V Min Max Min Max tPHL Propagation Delay 1.5 8.0 1.5 9.0 tPLH An to Bn or Bn to An 1.5 8.0 1.5 9.0 tPZL Output Enable Time tPZH Output Disable Time tPLZ tPHZ ns 1.5 10.0 1.5 11.0 1.5 10.0 1.5 11.0 1.5 8.0 1.5 9.0 1.5 8.0 1.5 9.0 tOSHL Output to Output Skew 1.0 1.0 tOSLH (Notes 4, 5) 1.0 1.0 ns ns ns 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 Parameter Conditions VCC (V) TA = 25˚C Units Max VOLP Quiet Output Dynamic Peak VOL CL = 50 pF, VIH = 3.0V, VIL = 0V 3.0 1.0 V VOLV Quiet Output Dynamic Valley VOL CL = 50 pF, VIH = 3.0V, V 3.0 -0.8 V IL = 0V Capacitance Max Units CIN Symbol Input Capacitance VCC = Open, VI = 0V or VCC 10 pF CI/O Input/Output Capacitance VCC = 3.3V, VI = 0V or VCC 12 pF CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 30 pF www.national.com Parameter Conditions 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. 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