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DM74ALS244ASJ 数据手册 - Fairchild（飞兆/仙童）
制造商:
Fairchild（飞兆/仙童）
分类:
逻辑控制器
封装:
SOIC-20
描述:
八路三态总线驱动器 Octal 3-STATE Bus Driver
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DM74ALS244ASJ数据手册
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© 2000 Fairchild Semiconductor Corporation DS006212 www.fairchildsemi.com
September 1986
Revised February 2000
DM74ALS244A Octal 3-STATE Bus Driver
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 −40°C to +85°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
■ Advanced low power oxide-isolated ion-implanted
Schottky TTL process
■ Functional and pin compatible with the 74LS counterpart
■ Improved switching performance with less power dissi-
pation compared with the 74LS counterpart
■ Switching response specified into 500Ω and 50 pF load
■ Switching response specifications guaranteed over full
temperature and V
CC
supply range
■ PNP input design reduces input loading
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
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
Logic Diagram
Order Number Package Number Package Description
DM74ALS244AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS244ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AMSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Input Output
G
AY
LL L
LH H
HX Z
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