74LS75 4-Bit Bistable Latch IC

The 74LS75  are latches used as temporary storage for binary information between processing units and input/output or indicator units. It feature complementary Q and Q’ outputs from a 4-bit latch, and are manufactured in various 16-pin packages. These circuits are perfectly compatible with all popular TTL families. The 74LS75 IC designed to operate at a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of IC always comes in TTL which makes it easy to figure with other TTL devices and microcontrollers.

When the Enable is HIGH,  the Data present at a data (D) input is transferred to the Q output. And the Q output will follow the data input as long as the Enable remains HIGH. Whereas, when the Enable goes LOW, the information (that was present at the data input at the time the transition occurred) is retained at the Q output until the Enable is permitted to go HIGH.

A latch is a device that can be used to store a single bit of data. When the clock input is high, the D latch is used to capture, or ‘latch,’ the logic level existing on the Data line. The output, Q, follows the input, D, if the data on the D line changes state while the clock pulse is high. When the CLK input is set to logic 0, the D input’s last state is trapped and held in the latch.

Applications

• Used in devices such as displays for calculators, digital watches & displays, etc.
• Used in digital clocks, electronic meters, and other electronic devices that display numerical information.