Overview
The SN74AHCT573PWR is an octal transparent D-type latch produced by Texas Instruments. This device is part of the AHCT series, which is designed for high-speed and low-power 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, making it suitable for bus-driven applications.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 4.5 | 5.5 | |
| VIH (High-level Input Voltage) | V | 3.85 | ||
| VIL (Low-level Input Voltage) | V | 1.65 | ||
| IOH (High-level Output Current) | µA | -8 | ||
| tpd (Propagation Delay, D to Q) | ns | 5.1 | 7 | 9.5 |
| tpd (Propagation Delay, LE to Q) | ns | 5.6 | 7.5 | 9.5 |
| tw (Pulse Duration, LE High) | ns | 5 | ||
| tsu (Setup Time, Data before LE↓) | ns | 3.5 | ||
| th (Hold Time, Data after LE↓) | ns | 1.5 | ||
| RθJA (Junction-to-ambient Thermal Resistance) | °C/W | 116.8 |
Key Features
- Inputs are TTL-voltage compatible.
- Latch-up performance exceeds 250mA per JESD 17.
- Buffered output-enable (OE) input for high-impedance state control.
- High drive capability to drive bus lines without interface or pull-up components.
- Available in various packages including DB (SSOP), DGV (TVSOP), DW (SOIC), N (PDIP), and PW (TSSOP).
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 SN74AHCT573PWR?
The primary function is to act as an octal transparent D-type latch, where the Q outputs follow the D inputs when the LE input is high, and the Q outputs are latched when LE is low.
- What is the purpose of the OE input?
The OE input is used to place the eight outputs in either a normal logic state or a high-impedance state.
- What are the typical propagation delays for this device?
The propagation delay from D to Q is typically 7 ns, and from LE to Q is typically 7.5 ns, with a load capacitance of 15 pF.
- What are the recommended operating conditions for VCC?
The recommended supply voltage (VCC) is between 4.5V and 5.5V.
- What is the thermal resistance of the PW package?
The junction-to-ambient thermal resistance (RθJA) for the PW package is 116.8 °C/W.
- What are the setup and hold times for the data input relative to the LE input?
The setup time is 3.5 ns, and the hold time is 1.5 ns.
- Is the SN74AHCT573PWR compatible with TTL voltage levels?
Yes, the inputs are TTL-voltage compatible.
- 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.
- What packages is the SN74AHCT573 available in?
The device is available in DB (SSOP), DGV (TVSOP), DW (SOIC), N (PDIP), and PW (TSSOP) packages.
- How does the high-impedance state of the outputs benefit the application?
The high-impedance state allows the outputs to neither load nor drive the bus lines significantly, which is beneficial for bus-driven applications.
