DM74ALS244A Octal 3-STATE Bus Driver
September 1986
Revised February 2000
DM74ALS244A
Octal 3-STATE Bus Driver
General Description
This octal 3-STATE bus driver is designed to provide the
designer with flexibility in implementing a bus interface with
memory, microprocessor, or communication systems. This
device offers 64-extended temperature Grade product
guaranteeing performance from
鈭?0擄C
to
+85擄C.
The out-
put 3-STATE gating control is organized into two separate
groups of four buffers, and both control inputs enable the
respective outputs when set logic LOW. The 3-STATE cir-
cuitry contains a feature that maintains the buffer outputs in
3-STATE (high impedance state) during power supply
ramp-up or ramp-down. This eliminates bus glitching prob-
lems that arise during power-up and power-down.
Features
s
Advanced low power
Schottky TTL process
oxide-isolated
ion-implanted
s
Functional and pin compatible with the 74LS counterpart
s
Improved switching performance with less power dissi-
pation compared with the 74LS counterpart
s
Switching response specified into 500鈩?and 50 pF load
s
Switching response specifications guaranteed over full
temperature and V
CC
supply range
s
PNP input design reduces input loading
Ordering Code:
Order Number
DM74ALS244AWM
DM74ALS244ASJ
DM74ALS244AMSA
DM74ALS244AN
Package Number
M20B
M20D
MSA20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
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 鈥淴鈥?to the ordering code.
Connection Diagram
Logic Diagram
Function Table
Input
G
L
L
H
A
L
H
X
Output
Y
L
H
Z
H
=
HIGH Level Logic State
L
=
LOW Level Logic State
X
=
Don't Care (Either LOW or HIGH Level Logic State)
Z
=
High Impedance (OFF) State
漏 2000 Fairchild Semiconductor Corporation
DS006212
www.fairchildsemi.com
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