© 1999 Fairchild Semiconductor Corporation DS010629 www.fairchildsemi.com
November 1989
Revised August 1999
7
4F2645 O
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t
a
l

Bus T
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ansc
eiver
74F2645
Octal Bus Transceiver
with 25Ω Series Resistors in the Outputs
General Description
This device is an octal bus transceiver designed for asyn-
chronous two-way data flow between the A and B busses
and is functionally equivalent to the 74F645. The 25Ω
series resistors in the outputs reduce ringing and eliminate
the need for external resistors. Both busses are capable of
sinking 12 mA, sourcing 15 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
74F2645 is a low power version of the 74F245 with 25Ω
series resistors in the outputs.
Features
a73 25Ω series resistors in the outputs eliminates the need
for external resistors
a73 Designed for asynchronous two-way data flow between
busses
a73 Outputs sink 12 mA and source 15 mA
a73 Transmit/receive (T/R) input controls the direction of
data flow
a73 74F2645 is a low power version of the 74F245 with 25Ω
series resistors in the outputs

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol Connection Diagram
FAST is a registered trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74F2645SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide