© 1999 Fairchild Semiconductor Corporation DS010267 www.fairchildsemi.com
July 1989
Revised August 1999
7
4F640
•
74F645

Octa
l Bus
T
r
anscei
ver wit
h

3-
ST
A
T
E Output
s
74F640 • 74F645
Octal Bus Transceiver with 3-STATE Outputs
General Description
These devices are octal bus transceivers designed for
asynchronous two-way data flow between the A and B bus-
ses. Both busses are capable of sinking 64 mA, have 3-
STATE outputs, and a common output enable pin. The
direction of data flow is determined by the transmit/receive
(T/R) input. The 74F645 is a high speed/low power version
of the 74F245. The 74F640 is an inverting option of the
74F645.
Features
a73 Designed for asynchronous two-way data flow between
busses
a73 Outputs sink 64 mA
a73 Transmit/receive (T/R) input controls the direction of
data flow
a73 74F645 is a lower power, faster version of the 74F245
a73 74F640 is an inverting option of the 74F645

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol Connection Diagram
Order Number Package Number Package Description
74F640SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F640PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74F645PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide