Octal 3-STATE Bus Driver
Description
DM74ALS1240A Octal 3-STATE Bus Driver
September 1986 Revised February 2000
DM74ALS1240A Octal 3-STATE Bus Driver
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 communication systems, and are low power dissipation versions of the DM74ALS240A and DM74ALS241A.
The output 3-STATE gating control is organized into two separate groups of four buffers.
The DM74ALS1240A control inputs symmetrically enable the respective outputs when set logic LOW.
The 3STATE 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 oxide-isolated, ion-implanted Schottky TTL process s Switching response specified into 500Ω and 50 pF load s Switching response specifications guaranteed over full temperature and VCC supply range s PNP input design reduces input loading s Low power dissipation version s Low level drive current: 74ALS = 16 mA
Ordering Code:
Order Number DM74ALS1240AWM Package Number M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 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 H L 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
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DM74ALS1240A
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical θJA N Package M Package 60.
5°C/W 78.
0°C/W 7V 7V 5.
5V 0°C to +70°C −65°C to +150°C
Note 1: The “Absolute Maximum Rati...
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