Overview
The 7475 Latch IC is a quad bistable transparent latch designed for use as temporary storage for binary information between processing units and input/output or indicator units. It contains four latches organized into two pairs, each with a common Enable (G) input. When the Enable input is High, the Q output follows the D input. When the Enable input goes Low, the data that was present at the input is “latched” and held at the output until the Enable is pulsed again.
Key Features
4-Bit Parallel Storage: Store four independent bits of data simultaneously.
Transparent Operation: Outputs follow inputs in real-time when Enable is active, allowing for high-speed data flow.
Complementary Outputs: Provides both Q and \bar{Q} outputs for each latch, eliminating the need for external inverters.
Standard 16-Pin Layout: Fits perfectly into breadboards and standard IC sockets.
Display Stabilization: The go-to IC for preventing “flicker” on 7-segment displays while a counter is still incrementing.
Technical Specifications
| Feature | Specification |
| Logic Family | 74LS (Low-power Schottky) / 74HC |
| Supply Voltage ($V_{CC}$) | 4.75V to 5.25V (Standard 5V) |
| Package Type | DIP-16 (Dual In-line Package) |
| Number of Latches | 4 (Two pairs with shared Enable) |
| Output Type | Differential (Q and Q) |
| Propagation Delay | ~15ns to 30ns |
| Operating Temperature | 0°C to 70°C |
Latch vs. Flip-Flop: What’s the difference?
Flip-Flop (7474): Only looks at the data during a specific “snap-shot” (the rising or falling edge of a clock).
Latch (7475): Is “open” as long as the Enable pin is High. It is level-triggered, not edge-triggered, making it better for simple data-holding tasks.
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