© 1999 Fairchild Semiconductor Corporation Ds009966 www.fairchildsemi.com
November 1988
Revised November 1999
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74AC540
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The AC540 is an octal buffer/line drivers designed to be
employed as memory and address drivers, clock drivers
and bus oriented transmitter/receivers.
These devices are similar in function to the AC240 while
providing flow-through architecture (inputs on opposite side
from outputs). This pinout arrangement makes these
devices especially useful as output ports for microproces-
sors, allowing ease of layout and greater PC board density.
Features
a73 I
CC
and I
OZ
reduced by 50%
a73 3-STATE inverting outputs
a73 Inputs and outputs opposite side of package, allowing
easier interface to microprocessors
a73 Output source/sink 24 mA

Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Truth Table
H = HIGH Voltage Level X = Immaterial
L = LOW Voltage Level Z = High Impedance
FACT is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74AC540SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74AC540SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC540MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC540PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Inputs
Outputs
OE
1
OE
2
I
LLH L
HXX Z
XHX
LLL H