Overview
The MC74HC373ADWR2, produced by onsemi, is an Octal 3-State Non-Inverting Transparent Latch. This device is part of the high-performance silicon-gate CMOS family and is designed to provide reliable and efficient data latching and output control. The MC74HC373A and its TTL-compatible version, MC74HCT373A, are identical in pinout to the LS373 and offer compatibility with CMOS, NMOS, and TTL outputs. The device features eight transparent D-type latches, allowing data to be latched when the Latch Enable input is low, and outputs can be placed in a high-impedance state using the Output Enable input.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VCC) | 2.0 to 6.0 (HC), 4.5 to 5.5 (HCT) | V |
| DC Input Voltage (VIN) | −0.5 to VCC + 0.5 | V |
| DC Output Voltage (VOUT) | −0.5 to VCC + 0.5 | V |
| Operating Free-Air Temperature (TA) | −55 to +125 | °C |
| Input Rise or Fall Time (tr, tf) | 0 to 1000 ns (depending on VCC) | ns |
| Maximum Propagation Delay, Input D to Q | 21 to 190 ns (depending on VCC) | ns |
| Maximum Input Leakage Current (IIN) | ±1.0 μA | μA |
| Maximum Three-State Leakage Current (IOZ) | ±10 μA | μA |
| Maximum Quiescent Supply Current (ICC) | Up to 80 μA (depending on VCC) | μA |
| Output Drive Capability | 15 LSTTL Loads |
Key Features
- Output Drive Capability: 15 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Operating Voltage Range: 2.0 to 6.0 V (HC), 4.5 to 5.5 V (HCT)
- Low Input Current: 1.0 μA
- High Noise Immunity Characteristic of CMOS Devices
- In Compliance with the JEDEC Standard No. 7.0 A Requirements
- Chip Complexity: 196 FETs or 49 Equivalent Gates
- Pb-Free and RoHS Compliant
Applications
The MC74HC373ADWR2 is suitable for a variety of applications where data latching and output control are necessary. These include:
- Memory Address Latching
- Input/Output Buffering
- Data Storage and Transfer in Digital Systems
- Level Conversion between TTL and CMOS Logic
- General Purpose Digital Logic Circuits
Q & A
- What is the primary function of the MC74HC373ADWR2?
The primary function is to act as an octal 3-state non-inverting transparent latch, allowing data to be latched and outputs to be controlled.
- What are the operating voltage ranges for the MC74HC373A and MC74HCT373A?
The MC74HC373A operates from 2.0 to 6.0 V, while the MC74HCT373A operates from 4.5 to 5.5 V.
- How many latches does the MC74HC373ADWR2 contain?
The device contains eight transparent D-type latches.
- What is the purpose of the Latch Enable and Output Enable inputs?
The Latch Enable input controls when data is latched, and the Output Enable input places the outputs in a high-impedance state when high.
- Is the MC74HC373ADWR2 compatible with TTL logic?
Yes, the MC74HCT373A version is compatible with TTL logic and can be used as a level converter.
- What is the maximum propagation delay from input D to output Q?
The maximum propagation delay varies from 21 to 190 ns depending on the supply voltage.
- Is the MC74HC373ADWR2 Pb-free and RoHS compliant?
Yes, the device is Pb-free and RoHS compliant.
- What are the typical packaging options for the MC74HC373ADWR2?
The device is available in SOIC-20 and TSSOP-20 packages.
- What is the operating temperature range for the MC74HC373ADWR2?
The operating temperature range is from −55°C to +125°C.
- How does the device handle unused inputs and outputs?
Unused inputs must be tied to an appropriate logic voltage level (GND or VCC), and unused outputs must be left open.
