Overview
The CD74HCT573M is a high-speed CMOS logic octal transparent D-type latch with three-state outputs, manufactured by Harris Corporation. This device is part of the 74HCT series and is designed to operate within a voltage range of 4.5V to 5.5V. It features low power consumption, balanced propagation delays, and significant power reduction compared to LS-TTL logic ICs. The CD74HCT573M is suitable for a wide range of applications due to its wide operating temperature range of -55°C to 125°C and its ability to drive up to 10 LS-TTL loads.
Key Specifications
| Parameter | Symbol | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|---|
| Voltage Supply | VCC | 4.5 | 5.5 | V | ||
| Operating Temperature | -55 | 125 | °C | |||
| Pulse Duration, LE High | tW | VCC = 5V, CL = 15pF | 16 | 20 | 24 | ns |
| Setup Time, Data before LE ↓ | tSU | VCC = 5V, CL = 15pF | 10 | 13 | 16 | ns |
| Hold Time, Data after LE ↓ | tH | VCC = 5V, CL = 15pF | 8 | 10 | 12 | ns |
| Propagation Delay, Data to Qn | tPD | VCC = 5V, CL = 50pF | 35 | 44 | 53 | ns |
| Output Transition Time | tTLH, tTHL | VCC = 5V, CL = 50pF | 12 | 15 | 18 | ns |
| Input Capacitance | CI | 10 | pF | |||
| Three-State Output Capacitance | CO | 20 | pF | |||
| Power Dissipation Capacitance | CPD | VCC = 5V | 53 | pF |
Key Features
- Common Latch Enable Control: The device features a common latch-enable (LE) input that controls the latching of all eight D-type latches.
- Common Three-State Output Enable Control: A buffered output-enable (OE) input allows the outputs to be placed in a high-impedance state, which is useful for bus driving applications.
- Buffered Inputs: The inputs are buffered to improve signal integrity.
- Three-State Outputs: The outputs can be set to a high-impedance state, which is essential for bus driving without the need for interface or pull-up components.
- Bus Line Driving Capacity: The device can drive up to 10 LS-TTL loads, making it suitable for bus line applications.
- Wide Operating Temperature Range: Operates from -55°C to 125°C, making it versatile for various environmental conditions.
- Balanced Propagation Delays and Transition Times: Ensures consistent and reliable operation.
- Significant Power Reduction: Compared to LS-TTL logic ICs, it offers lower power consumption.
- TTL-Voltage Compatible Inputs: Inputs are compatible with TTL voltage levels, enhancing compatibility with other TTL logic circuits.
Applications
The CD74HCT573M is suitable for a variety of applications, including:
- Bus Line Driving: Its ability to drive bus lines without the need for additional interface components makes it ideal for bus-oriented systems.
- Data Storage and Transfer: The device can be used in data storage and transfer circuits where data needs to be latched and held until further processing.
- Digital Logic Circuits: It is useful in digital logic circuits that require the latching of multiple data bits simultaneously.
- Industrial and Automotive Systems: The wide operating temperature range makes it suitable for use in industrial and automotive environments.
Q & A
- What is the voltage supply range for the CD74HCT573M?
The voltage supply range for the CD74HCT573M is 4.5V to 5.5V.
- What is the operating temperature range of the CD74HCT573M?
The operating temperature range is -55°C to 125°C.
- How many LS-TTL loads can the CD74HCT573M drive?
The device can drive up to 10 LS-TTL loads.
- What is the propagation delay for the CD74HCT573M?
The propagation delay is typically 35ns to 53ns for VCC = 5V and CL = 50pF.
- What is the purpose of the output-enable (OE) input?
The OE input allows the outputs to be placed in a high-impedance state, which is useful for bus driving applications.
- Is the CD74HCT573M compatible with TTL logic levels?
Yes, the inputs are TTL-voltage compatible.
- What is the package type for the CD74HCT573M?
The device is available in 20-SOIC, SSOP, PDIP, and CDIP packages.
- What is the power dissipation capacitance of the CD74HCT573M?
The power dissipation capacitance (CPD) is typically 53 pF at VCC = 5V.
- How does the latch-enable (LE) input function?
When the 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.
- What is the significance of the high-impedance state in the CD74HCT573M?
The high-impedance state allows the outputs to neither load nor drive the bus lines significantly, which is essential for bus driving applications without additional interface components.
