Overview
The SN74AHC573DWRG4 is an octal transparent D-type latch produced by Texas Instruments. This device is designed to operate within a wide voltage range of 2V to 5.5V, making it versatile for various applications. When the latch-enable (LE) input is high, the Q outputs follow the D inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs. The device also features a buffered output-enable (OE) input that can place the eight outputs in either a normal logic state or a high-impedance state, which is useful for driving bus lines without additional interface or pull-up components.
Key Specifications
| Parameter | Unit | Min | Max |
|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5.5 |
| VIH (High-level Input Voltage) at VCC = 5.5V | V | 3.85 | 3.85 |
| VIL (Low-level Input Voltage) at VCC = 5.5V | V | 1.65 | 1.65 |
| IOH (High-level Output Current) at VCC = 5V | mA | -8 | -8 |
| IOL (Low-level Output Current) at VCC = 5V | mA | 8 | 8 |
| TA (Operating Free-Air Temperature) | °C | -40 | 125 |
| tPLH (Propagation Delay Time, D to Q) at VCC = 5V, CL = 15 pF | ns | 4.5 | 8.5 |
| tPHL (Propagation Delay Time, D to Q) at VCC = 5V, CL = 15 pF | ns | 4.5 | 8.5 |
| tw (Pulse Duration, LE High) | ns | 5 | 5 |
| tsu (Setup Time, Data before LE↓) | ns | 3.5 | 3.5 |
| th (Hold Time, Data after LE↓) | ns | 1.5 | 1.5 |
Key Features
- Operating range from 2V to 5.5V VCC
- 3-state outputs directly drive bus lines
- Latch-up performance exceeds 250mA per JESD 17
- Wide operating voltage range allows down voltage translation
- Inputs accept voltages up to 5.5V
- Slow edges reduce output ringing
- Buffered output-enable (OE) input for high-impedance state control
Applications
- Servers
- PCs and Notebooks
- Network Switches
- Wearable Health and Fitness Devices
- Telecom Infrastructures
- Electronic Points of Sale
Q & A
- What is the operating voltage range of the SN74AHC573DWRG4?
The SN74AHC573DWRG4 operates within a voltage range of 2V to 5.5V.
- What is the function of the output-enable (OE) input?
The OE input can place the eight outputs in either a normal logic state or a high-impedance state.
- What is the significance of the latch-enable (LE) input?
When LE is high, the Q outputs follow the D inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs.
- What are the typical applications of the SN74AHC573DWRG4?
The device is used in servers, PCs and notebooks, network switches, wearable health and fitness devices, telecom infrastructures, and electronic points of sale.
- How does the SN74AHC573DWRG4 reduce output ringing?
The device reduces output ringing through its low drive and slow edge rates, which minimize overshoot and undershoot on the outputs.
- What is the maximum operating free-air temperature for the SN74AHC573DWRG4?
The maximum operating free-air temperature is 125°C.
- What is the minimum pulse duration for the LE input?
The minimum pulse duration for the LE input is 5 ns.
- What is the setup time for data before LE goes low?
The setup time for data before LE goes low is 3.5 ns.
- What is the hold time for data after LE goes low?
The hold time for data after LE goes low is 1.5 ns.
- How do the inputs handle voltages above the VCC level?
The inputs accept voltages up to 5.5V, allowing down voltage translation to the VCC level.
