SN74HC373NSR
| Parameters | |
|---|---|
| Series | 74HC |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C |
| Output Type | Tri-State |
| Supplier Device Package | 20-SO |
| Independent Circuits | 1 |
| Voltage - Supply | 2V ~ 6V |
| Circuit | 8:8 |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Logic Type | D-Type Transparent Latch |
| Delay Time - Propagation | 15ns |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | 74HC373 |
| REACH Status | REACH Unaffected |
| Standard Package | 2,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
SN74HC373NSR 8-Bit Transparent D-Type Latch with Tri-State Outputs
The SN74HC373NSR, manufactured by Texas Instruments (TI), is a high-performance 8-bit transparent D-type latch designed for driving capacitive or low-impedance loads in space-constrained applications. Featuring tri-state outputs and a 20-pin SOP (Small Outline Package) form factor, it operates across a wide voltage range of 2V to 6V, making it compatible with both 3.3V and 5V systems. The device supports transparent latching: when the latch-enable (LE) input is high, outputs (Q) follow data inputs (D) in real time. The SN74HC373NSR also includes an output-enable (OE) pin to place outputs in high-impedance mode, enabling bidirectional bus interfacing without contention. With a typical propagation delay of 13ns and robust ESD protection (±2kV HBM), it is ideal for industrial, automotive, and consumer electronics requiring reliable, high-speed data storage.
SN74HC373NSR D-Type Latch Applications
● Buffer Registers: Used to isolate high-speed processors from slow-response peripherals, preventing data corruption during transfers.
● I/O Port Expansion: Extends microcontroller GPIO pins in embedded systems, such as Atmel AT89C55-based designs requiring additional interfaces for sensors or displays.
● Bidirectional Bus Drivers: Enables shared data bus communication between multiple devices (e.g., Realtek RTL8019AS Ethernet controllers and memory arrays) by controlling output impedance via OE.
● Working Registers: Temporarily stores intermediate data in multi-task processing pipelines, ensuring seamless context switching.
● Memory Management: Supports external RAM expansion in systems with limited onboard storage, such as 32KB SRAM modules interfaced with 8-bit MCUs.
Alternative transparent D-type latch Models
1. TC74HC573APF (Toshiba): A functionally equivalent 8-bit latch with tri-state outputs, offering identical voltage range (2V–6V) but slightly lower max output current (6mA).
2. 74AC573PC (NXP): A high-speed variant with 3.3V/5V compatibility, featuring a 5.5ns propagation delay but narrower temperature range (-40°C to +85°C).
3. DM74S373N (Fairchild): A TTL-compatible latch with higher power consumption (22mA ICC) but stronger output drive (16mA), suitable for legacy 5V systems.
