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74VHCT245A Octal Buffer/Line Driver with 3-STATE Outputs
March 1997 Revised April 2005
74VHCT245A Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The VHCT245A is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The VHCT245A is intended for bidirectional asynchronous communication between data busses. The direction of data transmission is determined by the level of the T/R input. The enable input can be used to disable the device so that the busses are effectively isolated. Protection circuits ensure that 0V to 7V can be applied to the input and output (Note 1) pins without regard to the supply voltage. These circuits prevent device destruction due to mismatched supply and input/output voltages. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up.
Note 1: Outputs in OFF-State
Features
s High Speed:
tPD
5.4 ns (typ) at VCC
5V 25qC
s Power Down Protection on Inputs and Outputs s Low Power Dissipation: ICC
4 PA (Max) @ TA
s Pin and Function Compatible with 74HCT245
Ordering Code:
Order Number 74VHCT245AM 74VHCT245ASJ 74VHCT245AMTC 74VHCT245AN Package Number M20B M20D MTC20 N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Pb-Free 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 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Pb-Free package per JEDED J-STD-020B.
Logic Symbol
IEEE/IEC
Connection Diagram
(c) 2005 Fairchild Semiconductor Corporation
DS500004
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74VHCT245A
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
Truth Table
Inputs Outputs OE L L H
H HIGH Voltage Level L LOW Voltage Level X Immaterial
T/R L H X Bus B Data to Bus A Bus A Data to Bus B HIGH-Z State
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74VHCT245A
Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT ) (Note 3) (Note 4) Input Diode Current (IIK) Output Diode Current (IOK) (Note 5) DC Output Current (IOUT ) DC VCC/GND Current (ICC) Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) 260qC
0.5V to 7.0V 0.5V to 7.0V 0.5V to VCC 0.5V 0.5V to 7.0V 20 mA r20 mA r25 mA r75 mA 65qC to 150qC
Recommended Operating Conditions (Note 6)
Supply Voltage (VCC) Input Voltage (VIN) Output Voltage (VOUT) (Note 3) (Note 4) Operating Temperature (TOPR) Input Rise and Fall Time (tr, tf) VCC 5.0V r 0.5V 0 ns/V a 20 ns/V
Note 2: Absolute Maximum Ratings are values beyond which the device may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation outside databook specifications. Note 3: HIGH or LOW state. IOUT absolute maximum rating must be observed. Note 4: When outputs are in OFF-State or when VCC Note 5: VOUT GND, V OUT ! VCC (Outputs Active). Note 6: Unused inputs must be held HIGH or LOW. They may not float. OV.
4.5V to 5.5V 0V to 5.5V 0V to VCC 0V to 5.5V
40qC to 85qC
DC Electrical Characteristics
Symbol VIH VIL VOH VOL IOZ IIN ICC ICCT IOFF Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage 3-STATE Output Off-State Current Input Leakage Current Quiescent Supply Current Maximum ICC/Input Output Leakage Current (Power Down State) 5.5 0.0 1.35 0.5 1.50 5.0 mA VIN VOUT 3.4V VCC or GND 5.5V Other Input 5.5 4.0 40.0 0-5.5 V CC (V) 4.5 5.5 4.5 5.5 4.5 4.5 5.5 4.40 3.94 0.0 0.1 0.36 4.50 Min 2.0 2.0 0.8 0.8 4.40 3.80 0.1 0.44 TA 25qC Typ Max TA
40qC to 85qC
Max 2.0 2.0 0.8 0.8
Min
Units V V V V V V VIN VIN VOUT VIN VIN VIN
Conditions
VIH IOH or VIL IOH VIH IOL or VIL IOL VIH or VIL
50 PA 8 mA
50 PA 8 mA
r0.25 r0.1
r2.5 r1.0
PA PA PA
VCC or GND 5.5V or GND VCC or GND
PA
3
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74VHCT245A
Noise Characteristics
Symbol VOLP (Note 7) VOLV (Note 7) VIHD (Note 7) VILD (Note 7) Parameter Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage VCC (V) 5.0 5.0 5.0 5.0 TA Typ 1.2 25qC Limits 1.6 Units V V V V CL CL CL CL 50 pF 50 pF 50 pF 50 pF Conditions
1.2
1.6
2.0 0.8
Note 7: Parameter guaranteed by design.
AC Electrical Characteristics
Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLH tOSHL CIN COUT CPD Parameter Propagation Delay Time 3-STATE Output Enable Time 3-STATE Output Disable Time Output to Output Skew Input Capacitance Output Capacitance Power Dissipation Capacitance
Note 8: Parameter guaranteed by design. tOSLH |tPLH max t PLH min|; tOSHL |tPHL max tPHL min| Note 9: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) CPD * VCC * fIN ICC/8 (per F/F). The total CPD when n pcs. of the Octal D Flip-Flop operates can be calculated by the equation: CPD (total) 20 12n.
V CC (V) 5.0 r 0.5 5.0 r 0.5 5.0 r 0.5 5.0 r 0.5 Min
TA
25qC Typ 4.9 5.4 9.4 9.9 10.1 Max 7.7 8.7 13.8 14.8 15.4 1.0 4 13 16 10
TA
40qC to 85qC
Max 8.5 9.5 15.0 16.0 16.5 1.0 10 1.0 1.0 1.0 1.0 1.0
Min
Units ns ns ns ns pF pF pF RL RL
Conditions CL CL 1 k: 1 k: CL CL CL 15 pF 50 pF 15 pF 50 pF 50 pF
(Note 8) VCC VCC Open 5.0V
(Note 9)
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74VHCT245A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B
5
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74VHCT245A
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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6
74VHCT245A
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
7
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74VHCT245A Octal Buffer/Line Driver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N20A
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. 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: 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 (c) 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. www.fairchildsemi.com 8 2. A critical component in 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. www.fairchildsemi.com

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