DM74ALS244A

DM74ALS244A Octal 3-STATE Bus Driver

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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 -40 C to 85 C. The output 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 circuitry 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 problems 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 dissipation compared with the 74LS counterpart s Switching response specified into 500 and 50 pF load s Switching response specifications guaranteed over full temperature and VCC 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 "X" 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

2000 Fairchild Semiconductor Corporation

DS006212

www.fairchildsemi.com