DM74ALS240A

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 500W and 50 pF load
Switching response specifications guaranteed over full temperature and VCC supply range
PNP input design reduces input loading
Low level drive current: 74ALS = 24 mA


Specifications

Supply Voltage, V_CC .................................................................7V
Input Voltage ...........................................................................7V
Voltage Applied to Disabled Output ......................................5.5V
Operating Free Air Temperature Range ................. 0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Typical q_JA
    N Package .................................................................60.5°C/W
    M Package ................................................................79.8°C/W


Description

These DM74ALS240A octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS240A control inputs symmetrically enable the respective outputsof DM74ALS240A 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 rampdown. This eliminates bus glitching problems that arise during power-up and power-down.