DM74ALS240A, DM74ALS241A Octal 3-STATE Bus Driver
September
2007
©1986 Fairchild Semiconductor Corporation www.fairchildsemi.com
DM74ALS240A, DM74ALS241A Rev. 1.3
DM74ALS240A, DM74ALS241A
Octal 3-STATE Bus Driver
Features
■
Advanced low power oxide-isolated ion-implanted
Schottky TTL process
■
Functional and pin compatible with the DM74LS
counterpart
■
Improved switching performance with less power
dissipation compared with the DM74LS counterpart
■
Switching response specified into 500
Ω
and 50pF
load
■
Switching response specifications guaranteed over
full temperature and V
CC
supply range
■
PNP input design reduces input loading
■
Low level drive current: 74ALS
=
24mA
General Description
These octal 3-STATE bus drivers are designed to
provide the designer with flexibility in implementing a bus
interface with memory, microprocessor, or communi-
cation systems. The output 3-STATE gating control is
organized into two separate groups of four buffers.
The DM74ALS240A control inputs symmetrically enable
the respective outputs when set logic LOW, while the
DM74ALS241A has complementary enable gating.
The 3-STATE circuitry contains a feature that maintains
the buffer outputs in 3-STATE (high impedance state)
during power supply ramp-up or ramp-down. This elimi-
nates bus glitching problems that arise during power-up
and power-down.
Ordering Information
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
DM74ALS240A DM74ALS241A
Order Number
Package
Number Package Description
DM74ALS240AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
DM74ALS240ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS240AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
DM74ALS241AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
