Overview
The SN74AHC573DWRE4 is an octal transparent D-type latch with 3-state outputs, designed and manufactured by Texas Instruments. This device operates 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 the high-impedance state, which is useful for driving bus lines without additional interface or pull-up components.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC Supply Voltage Range | - | V | -0.5 | - | 7 |
| VI Input Voltage Range | - | V | -0.5 | - | 7 |
| VO Output Voltage Range | - | V | -0.5 | - | VCC + 0.5 |
| tPLH (D to Q) @ CL = 15 pF, VCC = 3.3 V | - | ns | 7 | 11 | 14 |
| tPHL (D to Q) @ CL = 15 pF, VCC = 3.3 V | - | ns | 7 | 11 | 14 |
| tPLH (LE to Q) @ CL = 15 pF, VCC = 3.3 V | - | ns | 7.6 | 11.9 | 15 |
| TA Operating Free-Air Temperature | - | °C | -40 | - | 125 |
| Package Type | - | - | SOIC (DW) | - | - |
Key Features
- Wide operating voltage range: 2 V to 5.5 V
- Allows down voltage translation: Inputs accept voltages up to 5.5 V
- 3-state outputs directly drive bus lines
- Slow edges reduce output ringing
- Latch-up performance exceeds 250 mA per JESD 17
- 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 SN74AHC573DWRE4?
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 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 the high-impedance state.
- What are the typical propagation delays for the SN74AHC573DWRE4?
For VCC = 3.3 V, tPLH (D to Q) is typically 11 ns, and tPHL (D to Q) is typically 11 ns at CL = 15 pF.
- What is the maximum continuous output current?
The maximum continuous output current is ±25 mA.
- What are the thermal characteristics of the SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the SOIC package is 81.1 °C/W.
- What are some common applications for the SN74AHC573DWRE4?
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 power-up and power-down states?
To ensure the high-impedance state during power-up or power-down, the OE input should be tied to VCC through a pull-up resistor.
- What is the storage temperature range for the SN74AHC573DWRE4?
The storage temperature range is from –65°C to 150°C.
- Is the SN74AHC573DWRE4 compliant with any military standards?
On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted.
