Overview
The SN74AHCT573PWRE4 is an octal transparent D-type latch produced by Texas Instruments. This device is part of the SNx4AHCT573 family and is designed for various bus interface 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 a buffered output-enable (OE) input that can place the eight outputs in either a normal logic state or a high-impedance state, making it suitable for applications where output ringing is a concern.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Free-Air Temperature | °C | -40 | 125 | |
| Pulse Duration, LE High | ns | 5 | 5 | |
| Setup Time, Data Before LE↓ | ns | 3.5 | 3.5 | |
| Hold Time, Data After LE↓ | ns | 1.5 | 1.5 | |
| High-Level Output Current | mA | -8 | -8 | |
| Low-Level Output Current | mA | 8 | 8 | |
| Input Transition Rise or Fall Rate | ns/V | 20 | 20 | |
| Junction-to-Ambient Thermal Resistance (TSSOP) | °C/W | 116.8 |
Key Features
- Inputs are TTL-voltage compatible, allowing for translation from 3.3V to 5V logic levels.
- Latch-up performance exceeds 250mA per JESD 17.
- Buffered output-enable (OE) input for high-impedance state control.
- Low drive and slow edge rates to minimize output ringing and overshoot.
- Available in various packages including TSSOP, SSOP, TVSOP, SOIC, and PDIP.
- Operating temperature range from -40°C to 125°C.
Applications
- Servers
- PCs and notebooks
- Network switches
- Wearable health and fitness devices
- Telecom infrastructures
- Electronic points-of-sale
Q & A
- What is the primary function of the SN74AHCT573PWRE4?
The primary function is to act as an octal transparent D-type latch, where the Q outputs follow the D inputs when the latch-enable (LE) input is high, and latch the Q outputs when LE is low.
- What are the operating temperature ranges for this device?
The operating temperature range is from -40°C to 125°C.
- 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, which is useful for bus interface applications.
- What are the typical applications for this device?
Typical applications include servers, PCs and notebooks, network switches, wearable health and fitness devices, telecom infrastructures, and electronic points-of-sale.
- What are the key features of the SN74AHCT573PWRE4?
Key features include TTL-voltage compatible inputs, latch-up performance exceeding 250mA, buffered output-enable input, low drive and slow edge rates, and availability in various packages.
- How does the device handle input transitions?
The device has an input transition rise or fall rate of 20 ns/V, which helps in minimizing output ringing and overshoot.
- What is the junction-to-ambient thermal resistance for the TSSOP package?
The junction-to-ambient thermal resistance for the TSSOP package is 116.8 °C/W.
- Can the SN74AHCT573PWRE4 be used for 3.3V to 5V logic translation?
Yes, the device is suitable for translating up from 3.3V to 5V logic levels due to its lowered switching threshold.
- What is the recommended setup time for data before LE goes low?
The recommended 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.
