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Fairchild Semiconductor - Octal Bus Transceivers

Numéro de référence DM74ALS645A
Description Octal Bus Transceivers
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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DM74ALS645A fiche technique
March 1987
Revised February 2000
DM74ALS645A
Octal Bus Transceivers
General Description
These octal bus transceivers are designed for asynchro-
nous two-way communication between data busses. These
devices transmit data from the A bus to the B bus or from
the B bus to the A bus depending upon the level at the
direction control (DIR) input. The enable input (G) can be
used to disable the device so the busses are effectively
isolated.
Features
s Advanced Oxide-isolated Ion-implanted Schottky TTL
process
s Switching performance is guaranteed over full tempera-
ture and VCC supply range
s Switching performance specified at 50 pF
s PNP input design reduces input loading
Ordering Code:
Order Number Package Number
Package Description
DM74ALS645AWM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS645AN
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Logic Diagram
Function Table
Control
Inputs
G DIR
LL
LH
HX
L = LOW Logic Level
H = HIGH Logic Level
X = Either LOW or HIGH Logic Level
Operation
B Data to A Bus
A Data to B Bus
Isolation
© 2000 Fairchild Semiconductor Corporation DS009304
www.fairchildsemi.com

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