Overview
The SN74AHCT573 is an octal transparent D-type latch produced by Texas Instruments. This device is part of the AHCT (Advanced High-Speed CMOS) family, known for its compatibility with TTL (Transistor-Transistor Logic) voltage levels and low power consumption. 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 interface applications.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Free-Air Temperature | °C | -40 | 125 | |
| Supply Voltage (VCC) | V | 4.5 | 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 | |
| Junction-to-Ambient Thermal Resistance (RθJA) | °C/W | 53.3 | 117.2 |
Key Features
- TTL-Voltage Compatible Inputs: The device is compatible with TTL voltage levels, allowing for seamless integration with TTL-based systems.
- High-Impedance State: The outputs can be placed in a high-impedance state, which neither loads nor drives the bus lines significantly.
- Low Power Consumption: The device operates with low power consumption, making it suitable for power-sensitive applications.
- Slow Edges Reduce Output Ringing: The slow edge rates of the device minimize overshoot and undershoot on the outputs, reducing noise and improving signal integrity.
- Latch-Up Performance: The device exceeds 250mA latch-up performance per JESD 17.
- Multiple Package Options: Available in various packages such as SOIC, SSOP, TVSOP, PDIP, and TSSOP.
Applications
- Servers and Data Centers: Used in server and data center applications for reliable data latching and bus management.
- PCs and Notebooks: Suitable for use in personal computers and notebooks for managing data transfer between components.
- Network Switches: Employed in network switches to handle data latching and output enable functions efficiently.
- Wearable Health and Fitness Devices: Used in wearable devices where low power consumption and reliable data handling are crucial.
- Telecom Infrastructures: Applied in telecom infrastructure for reliable data management and bus interface applications.
- Electronic Points-of-Sale: Used in electronic points-of-sale systems for secure and efficient data handling.
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, allowing data to be latched and output in a controlled manner.
- What are the operating temperature ranges for the SN74AHCT573?
The operating temperature range for the SN74AHCT573 is from -40°C to 125°C.
- What is the significance of the high-impedance state in the SN74AHCT573?
The high-impedance state allows the outputs to neither load nor drive the bus lines significantly, which is useful for bus interface applications.
- How does the SN74AHCT573 handle TTL voltage levels?
The SN74AHCT573 is TTL-voltage compatible, with input switching levels lowered to accommodate TTL inputs of 0.8V VIL and 2V VIH.
- What are the package options available for the SN74AHCT573?
The SN74AHCT573 is available in various packages including SOIC, SSOP, TVSOP, PDIP, and TSSOP.
- How does the device minimize output ringing?
The device minimizes output ringing through its slow edge rates, reducing overshoot and undershoot on the outputs.
- What is the latch-up performance of the SN74AHCT573?
The device exceeds 250mA latch-up performance per JESD 17.
- Can the SN74AHCT573 be used in power-sensitive applications?
Yes, the SN74AHCT573 operates with low power consumption, making it suitable for power-sensitive applications.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can place the eight outputs in either a normal logic state or a high-impedance state.
- How do you ensure proper device operation for unused inputs?
All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
