Texas Instruments SN74AHCT573 Octal Transparent D-Type Latches
Texas Instruments SN74AHCT573 Octal Transparent D-Type Latches that include inputs that are TTL-voltage compatible. The Q outputs follow the data (D) inputs when the latch-enable (LE) input is high. The Q outputs are latched at the logic levels of the D inputs when LE is low.
A buffered output-enable (/OE) input can be used to place the eight outputs in either the high-impedance state or a normal logic state (high or low). The outputs neither load nor drive the bus lines significantly in the high-impedance state. The high-impedance state and increased drive capability enable the bus lines to be driven without requiring interface or pull-up components.
To put the Texas Instruments SN74AHCT573 in the high-impedance state during power-up or power-down, tie /OE to VCC through a pull-up resistor. The current-sinking capability of the driver determines the minimum value of the resistor. /OE does not affect the internal operations of the latches. New data can be entered, or old data can be retained while the outputs are in the high-impedance state.
Features
- Inputs are TTL-voltage compatible
- Lowered switching threshold allows translation up to 3.3V to 5V
- Slow edges reduce output ringing
- Latch-up performance exceeds 250mA per JESD 17
Applications
- PCs and notebooks
- Network switches
- Wearable health and fitness devices
- Telecom infrastructures
- Electronic points-of-sale
Additional Resources
- SN74AHCT573 Datasheet
- Application Note: Advanced High-Speed CMOS (AHC) Logic Family
- Application Note: How to Select Little Logic
- Application Note: Implications of Slow or Floating CMOS Inputs
- Application Note: Selecting the Right Level Translation Solution
- Application Note: Understanding and Interpreting Standard-Logic Data Sheets
- Selection Guide: Logic Guide
- User Guide: LOGIC Pocket Data Book
Functional Block Diagram
Development Tool
Texas Instruments 14-24-LOGIC-EVM Logic Evaluation Module (EVM)
Generic evaluation module developed to support any TI logic leaded device in a 14 to 24 pin count.
Related D-Type Latches
Texas Instruments SN74AHCT574 Octal Transparent D-Type Latches
3-state outputs designed specifically for driving high-capacitive or relatively low-impedance loads