© 2005 Fairchild Semiconductor Corporation DS500004 www.fairchildsemi.com
March 1997
Revised April 2005
7
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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 technol-
ogy. It achieves high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low
power dissipation. The VHCT245A is intended for bidirec-
tional 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 dis-
able 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
a73 High Speed: t
PD
c32 5.4 ns (typ) at V
CC
c32 5V
a73 Power Down Protection on Inputs and Outputs
a73 Low Power Dissipation: I
CC
c32 4 c80A (Max) @ T
A
c32 25c113C
a73 Pin and Function Compatible with 74HCT245

Ordering Code:
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
Order Number Package Number Package Description
74VHCT245AM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74VHCT245ASJ M20D Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHCT245AMTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHCT245AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide