Overview
The SN74AHC573DWG4 is an octal transparent D-type latch produced by Texas Instruments. This device is designed to operate within a wide voltage range of 2 V to 5.5 V, making it versatile for various applications. When the latch-enable (LE) input is high, the Q outputs follow the data (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 = 5.5 V | V | 3.85 | 3.85 |
| VIL (Low-level Input Voltage) at VCC = 5.5 V | V | 1.65 | 1.65 |
| IOH (High-level Output Current) at VCC = 5 V | mA | -8 | -8 |
| IOL (Low-level Output Current) at VCC = 5 V | mA | 8 | 8 |
| TA (Operating Free-Air Temperature) | °C | -40 | 125 |
| tPLH (Propagation Delay Time, D to Q) at VCC = 5 V | ns | 4.5 | 8.5 |
| tPHL (Propagation Delay Time, D to Q) at VCC = 5 V | ns | 4.5 | 8.5 |
Key Features
- Wide operating voltage range: 2 V to 5.5 V
- 3-state outputs directly drive bus lines
- Latch-up performance exceeds 250 mA per JESD 17
- Allows down voltage translation: Inputs accept voltages up to 5.5 V
- 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 SN74AHC573DWG4?
The operating voltage range is from 2 V to 5.5 V.
- What is the function of the latch-enable (LE) input?
When the LE input is high, the Q outputs follow the data (D) inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs.
- What is the purpose 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 are the typical propagation delay times for this device?
The propagation delay times (tPLH and tPHL) at VCC = 5 V are typically between 4.5 ns and 8.5 ns.
- What is the maximum operating temperature for the SN74AHC573DWG4?
The maximum operating temperature is 125°C.
- What are some common applications for this device?
Common applications include servers, PCs and notebooks, network switches, wearable health and fitness devices, telecom infrastructures, and electronic points of sale.
- How does the device handle latch-up performance?
The latch-up performance exceeds 250 mA per JESD 17.
- What is the significance of slow edges in this device?
Slow edges reduce output ringing.
- Can the inputs accept voltages higher than the supply voltage?
Yes, the inputs can accept voltages up to 5.5 V, allowing for down voltage translation.
- How should the OE input be managed during power-up or power-down to ensure the high-impedance state?
The OE input should be tied to VCC through a pull-up resistor to ensure the high-impedance state during power-up or power-down.
