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74LVX245 Low Voltage Octal Bidirectional Transceiver
April 1993 Revised March 1999
74LVX245 Low Voltage Octal Bidirectional Transceiver
General Description
The LVX245 contains eight non-inverting bidirectional buffers and is intended for bus-oriented applications. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-HIGH) enables data from A Ports to B Ports; Receive (active-LOW) enables data from B Ports to A Ports. The Output Enable input, when HIGH, disables both A and B Ports by placing them in a high impedance condition.
Features
s Ideal for low power/low noise 3.3V applications s Guaranteed simultaneous switching noise level and dynamic threshold performance
Ordering Code
Order Number 74LVX245M 74LVX245SJ 74LVX245MTC Package Number M20B M20D MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbols
Connection Diagram
Pin Descriptions
Pin Names OE T/R A0-A7 B0-B7 Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs Description
Truth Table
Inputs OE L L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
Outputs T/R L H X Bus B Data to Bus A Bus A Data to Bus B HIGH-Z State
(c) 1999 Fairchild Semiconductor Corporation
DS011597.prf
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74LVX245
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V DC Input Voltage T/R, OE (VI) DC Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Bus I/O Voltage (VI/O) DC Output Source or Sink Current (IO) DC VCC or Ground Current (ICC or IGND) Storage Temperature (TSTG) Power Dissipation 75 mA -65C to +150C 180 mW 25 mA -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA -0.5V to 7V -0.5V to +7.0V
Recommended Operating Conditions (Note 2)
Supply Voltage (VCC) Input Voltage T/R, OE (VI) Bus I/O Voltage (VI/O) Operating Temperature (TA) Input Rise and Fall Time (t/V) 2.0V to 3.6V 0V to 5.5V 0V to VCC -40C to +85C 0 ns/V to 100 ns/V
Note 1: 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 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage VIL LOW Level Input Voltage VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IOZ 3-STATE Output Off-State Current IIN ICC Input Leakage Current Quiescent Supply Current 3.6 3.6 0.1 4.0 1.0 40.0 A A VIN = 5.5V or GND VIN = VCC or GND VCC 2.0 3.0 3.6 2.0 3.0 3.6 2.0 3.0 3.0 2.0 3.0 3.0 3.6 1.9 2.9 2.58 0.0 0.0 0.1 0.1 0.36 0.25 2.0 3.0 TA = +25C Min 1.5 2.0 2.4 0.5 0.8 0.8 1.9 2.9 2.48 0.1 0.1 0.44 2.5 A VIN = VIH or VIL VOUT = VCC or GND V VIN = VIH or VIL V Typ Max TA = -40C to +85C Min 1.5 2.0 2.4 0.5 0.8 0.8 VIN = VIH or VIL IOH = -50 A IOH = -50 A IOH = -4 mA IOL = 50 A IOL = 50 A IOL = 4 mA V V Max Units Conditions
Noise Characteristics
Symbol VOLP VOLV VIHD VILD Parameter
(Note 3)
VCC (V) 3.3 3.3 3.3 3.3 TA = 25C Typ 0.5 -0.5 Limit 0.8 -0.8 2.0 0.8 Units V V V V Conditions CL (pF) 50 50 50 50
Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage
Note 3: Input tr = tf = 3 ns
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74LVX245
AC Electrical Characteristics
Symbol tPLH tPHL 3.3 0.3 tPZL tPZH 3-STATE Output Enable Time 3.3 0.3 tPLZ tPHZ tOSLH tOSHL 3-STATE Output Disable Time Output to Output Skew (Note 4) 2.7 3.3 0.3 2.7 3.3 2.7 Parameter Propagation Delay Time VCC (V) 2.7 TA = +25C Min Typ 6.1 8.6 4.7 7.2 9.0 11.5 7.1 9.6 11.5 9.6 Max 10.7 14.2 6.8 10.1 16.9 20.4 11.0 14.5 18.0 12.8 1.5 1.5 TA =-40C to +85C Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 13.5 17.0 8.0 11.5 20.5 24.0 13.0 16.5 21.0 14.5 1.5 1.5 ns ns ns ns Units Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 15 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 50 pF (Note 4)
Note 4: Parameter guaranteed by design. tOSLH = |tPLHm - tPLHn|, tOSHL = |t PHLm - t PHLn|
Capacitance
Symbol CIN CI/O CPD Parameter Min Input Capacitance T/R, OE Output Capacitance An, B n Power Dissipation Capacitance (Note 5) TA = +25C Typ 4 8 21 Max 10 TA = -40C to +85C Min Max 10 pF pF pF Units
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
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74LVX245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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74LVX245 Low Voltage Octal Bidirectional Transceiver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 LIFE SUPPORT POLICY FAIRCHILD'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 FAIRCHILD 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 systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. 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 www.fairchildsemi.com user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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