Overview
The SN74AHC573DWR 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 data (D) inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs. The device features 3-state outputs that can be placed in a high-impedance state, allowing them to drive bus lines without the need for interface or pull-up components.
Key Specifications
| Parameter | Unit | Min | Max |
|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5.5 |
| VIH (High-level Input Voltage) | V | 1.5 (VCC = 2V), 2.1 (VCC = 3V), 3.85 (VCC = 5.5V) | 1.5 (VCC = 2V), 2.1 (VCC = 3V), 3.85 (VCC = 5.5V) |
| VIL (Low-level Input Voltage) | V | 0.5 (VCC = 2V), 0.9 (VCC = 3V), 1.65 (VCC = 5.5V) | 0.5 (VCC = 2V), 0.9 (VCC = 3V), 1.65 (VCC = 5.5V) |
| IOH (High-level Output Current) | mA | -50 (VCC = 2V), -4 (VCC = 3.3V), -8 (VCC = 5V) | -50 (VCC = 2V), -4 (VCC = 3.3V), -8 (VCC = 5V) |
| IOL (Low-level Output Current) | mA | 50 (VCC = 2V), 4 (VCC = 3.3V), 8 (VCC = 5V) | 50 (VCC = 2V), 4 (VCC = 3.3V), 8 (VCC = 5V) |
| TA (Operating Free-Air Temperature) | °C | -40 | 125 |
| tPLH (Propagation Delay Time, D to Q) | ns | 7 (VCC = 3.3V), 4.5 (VCC = 5V) | 11 (VCC = 3.3V), 6.8 (VCC = 5V) |
| tPHL (Propagation Delay Time, D to Q) | ns | 7 (VCC = 3.3V), 4.5 (VCC = 5V) | 11 (VCC = 3.3V), 6.8 (VCC = 5V) |
| Package | SOIC (DW), SSOP (DB), TVSOP (DGV) |
Key Features
- Wide operating voltage range: 2V to 5.5V
- 3-state outputs directly drive bus lines
- Latch-up performance exceeds 250mA per JESD 17
- 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 SN74AHC573DWR?
The SN74AHC573DWR operates within a voltage range of 2V to 5.5V.
- 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 (high or low) or the high-impedance state.
- What are the typical applications of the SN74AHC573DWR?
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 device handle output ringing?
The device features slow edge rates that minimize overshoot and undershoot on the outputs, reducing output ringing.
- What is the thermal resistance of the SOIC (DW) package?
The junction-to-ambient thermal resistance (RθJA) for the SOIC (DW) package is approximately 81.1°C/W.
- What are the propagation delay times for the SN74AHC573DWR?
The propagation delay times (tPLH and tPHL) are approximately 7ns to 11ns for VCC = 3.3V and 4.5ns to 6.8ns for VCC = 5V.
- How should unused inputs be handled?
All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
- What is the latch-up performance of the SN74AHC573DWR?
The latch-up performance exceeds 250mA per JESD 17.
- What are the recommended operating conditions for the input voltage?
The input voltage (VI) should be between 0V and 5.5V.
