Overview
The 74HC373 Octal Latch IC is a high-speed silicon-gate CMOS device containing eight D-type transparent latches with individual D-inputs and 3-state outputs. When the Latch Enable (LE) input is High, the outputs follow the data at the inputs. When LE goes Low, the data is “latched” and held steady. This chip is famously used as an address latch for microcontrollers like the 8051 or for expanding the I/O pins of an Arduino or ESP32 when driving large LED arrays or memory modules.
Key Features
8-Bit Parallel Handling: Process an entire byte of data simultaneously in one 20-pin package.
3-State Outputs: Includes an Output Enable ($\overline{OE}$) pin that can set the outputs to a high-impedance state, allowing direct connection to system buses.
Transparent Mode: Outputs respond instantly to input changes when the latch is “open.”
High-Speed CMOS: Offers the speed of TTL logic with the significantly lower power consumption of CMOS technology.
Wide Operating Voltage: Works reliably from 2V to 6V, making it compatible with both 3.3V and 5V logic levels.
Technical Specifications
| Feature | Specification |
| Logic Family | 74HC (High-Speed CMOS) |
| Supply Voltage ($V_{CC}$) | 2.0V to 6.0V |
| Number of Bits | 8 (Octal) |
| Output Type | 3-State (High-Z capable) |
| Package Type | DIP-20 (Dual In-line Package) |
| Propogation Delay | ~12ns at 5V |
| Operating Temp | -40°C to +85°C |
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