Overview
The SN74AHCT573DWRG4 is an octal transparent D-type latch produced by Texas Instruments. This device is part of the SNx4AHCT573 family and is designed to operate in a variety of digital logic 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 components.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Free-Air Temperature | °C | -40 | 125 | |
| VCC (Supply Voltage) | V | 4.5 | 5 | 5.5 |
| High-Level Output Current (IOH) | mA | -8 | ||
| Low-Level Output Current (IOL) | mA | 8 | ||
| Input Transition Rise or Fall Rate | ns/V | 20 | ||
| 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 | |
| Propagation Delay Time (tpd), D to Q | ns | 5.1 | 7 | 9 |
| Junction-to-Ambient Thermal Resistance (RθJA) | °C/W | 53.3 |
Key Features
- Inputs are TTL-voltage compatible.
- Latch-up performance exceeds 250mA per JESD 17.
- Buffered output-enable (OE) input to place outputs in high-impedance state.
- High-impedance state allows outputs to neither load nor drive bus lines significantly.
- Increased drive capability to drive bus lines without interface or pull-up components.
- Old data can be retained or new data can be entered while outputs are in the high-impedance state.
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 SN74AHCT573?
The primary function of the SN74AHCT573 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 the Q outputs are latched at the logic levels of the D inputs when LE is low.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state, which is useful for driving bus lines without additional interface components.
- What are the operating temperature ranges for the SN74AHCT573?
The operating free-air temperature range for the SN74AHCT573 is -40°C to 125°C.
- What is the supply voltage range for the SN74AHCT573?
The supply voltage (VCC) range for the SN74AHCT573 is 4.5V to 5.5V.
- What is the propagation delay time (tpd) for the SN74AHCT573?
The propagation delay time (tpd) from D to Q is typically 7 ns, with a minimum of 5.1 ns and a maximum of 9 ns.
- What are the typical applications of the SN74AHCT573?
The SN74AHCT573 is used in various applications including servers, PCs and notebooks, network switches, wearable health and fitness devices, telecom infrastructures, and electronic points-of-sale.
- What is the junction-to-ambient thermal resistance (RθJA) for the SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the SOIC package is 53.3°C/W.
- How does the high-impedance state of the outputs benefit the system?
The high-impedance state allows the outputs to neither load nor drive the bus lines significantly, which is beneficial for driving bus lines without additional interface or pull-up components.
- Can old data be retained while the outputs are in the high-impedance state?
Yes, old data can be retained or new data can be entered while the outputs are in the high-impedance state.
- What is the latch-up performance of the SN74AHCT573?
The latch-up performance of the SN74AHCT573 exceeds 250mA per JESD 17.
