MM74C240N

Features

• Latch-up performance exceeds 500mALatch-up performance of 500 mA at VCC = 50V
• High noise immunity of 0.45V over full operatingtemperature range
• Tri-state outputs automatically reduces powerdissipation over wide temperature range.
• Fully Buffered for highest noise immunity
• Can drive 8 lines and 32 outputs

Application Field and Working Principle

MM74C240N devices are designed primarily as electrical buffer amplifiers and have the capability to transform the levels of signals between each line. They provide regeneration, because they have complete active elements and can have linear response curves. The MM74C240N can be used to drive TTL memories and logic operations. These devices are also ideal for driving light-emitting diodes, lamps and liquid crystal displays.

The MM74C240N can accept logic levels of either TTL or CMOS family. When power supply is applied to the device, the tri-state output latch is reset and all the outputs are in the HIGH-IMPEDANCE state. The inputs of the device must be driven to TTL or CMOS logic levels of either the high or the low state. If the input is in the low state, a "low" is produced at the output. If the input is in the high state, a "high" is produced at the output. When power supply is removed, the last logic levels will be remembered. This permanent memory effect is also known as data retention.

The MM74C240N is extremely rugged and provides a high degree of noise immunity to both spikes generated by static discharge and noise present on the power supply due to transients produced by relays, motors, and other digital equipment sharing common power lines. The tri-state outputs automatically reduce power dissipation in multiple-driver applications over a wide temperature range.

In summary, the MM74C240N device is a versatile, low-cost 8-bit buffer/line driver which can be used to drive TTL memories and logic operations, light-emitting diodes, lamps and liquid crystal displays. It provides high noise immunity, latch-up performance exceeding 500mA and a wide temperature range.