74573 Octal D-Type Transparent Latch with 3-State Outputs 5V 70mA IC DIP-20
The 74573 and is 8-bit D-type transparent latch integrated circuits featuring 3-state outputs. These devices allow digital data present on the eight input lines (D0–D7) to pass directly to the outputs while the Latch Enable (LE) input is HIGH. When LE transitions LOW, the data currently present at the inputs is stored internally and remains available at the outputs until new data is latched. The Output Enable (OE) control allows all outputs to be placed in a high-impedance state, making the device suitable for shared bus systems.
The device is widely used in microprocessor, microcontroller, and digital communication systems where temporary data storage and bus buffering are required. The HC version supports CMOS input levels, while the HCT version is designed for TTL-compatible input levels. Its non-inverting outputs, low power consumption, and 3-state capability make it an effective solution for data routing, address latching, and digital interfacing applications.
Features:
- 8-bit transparent D-type latch.
- 3-state non-inverting outputs.
- Separate Latch Enable (LE) and Output Enable (OE) controls.
- Suitable for bus-oriented applications.
- Low power CMOS technology.
- High noise immunity.
- CMOS or TTL compatible input options.
- Inputs and outputs located on opposite sides for easy PCB routing.
- Can function as an input or output port interface.
- ESD protected inputs.
- Available in multiple package styles.
- Wide operating temperature range.
- Compatible with microprocessors and microcontrollers.
Specifications:
| Parameter | Value |
|---|---|
| Device Type | 74573 Octal D-Type Transparent Latch |
| Number of Latches | 8 |
| Output Type | 3-State Non-Inverting |
| Supply Voltage (74HC573) | 2.0V to 6.0V |
| Supply Voltage (74HCT573) | 4.5V to 5.5V |
| Logic Family | HC / HCT CMOS |
| Input Capacitance | 3.5 pF (typ.) |
| Propagation Delay (typ. @ 4.5V) | 17 ns |
| Output Current Capability | ±6 mA (typ.) |
| Maximum Output Current | ±35 mA |
| Maximum Supply Current | 70 mA |
| Operating Temperature | -40°C to +125°C |
| Package Pins | 20 |
| Output Enable | Active LOW |
| Latch Enable | Active HIGH |
Pinout:
| Pin | Name | Description |
|---|---|---|
| 1 | OE | Output Enable (Active LOW) |
| 2 | D0 | Data Input 0 |
| 3 | D1 | Data Input 1 |
| 4 | D2 | Data Input 2 |
| 5 | D3 | Data Input 3 |
| 6 | D4 | Data Input 4 |
| 7 | D5 | Data Input 5 |
| 8 | D6 | Data Input 6 |
| 9 | D7 | Data Input 7 |
| 10 | GND | Ground |
| 11 | LE | Latch Enable |
| 12 | Q7 | Output 7 |
| 13 | Q6 | Output 6 |
| 14 | Q5 | Output 5 |
| 15 | Q4 | Output 4 |
| 16 | Q3 | Output 3 |
| 17 | Q2 | Output 2 |
| 18 | Q1 | Output 1 |
| 19 | Q0 | Output 0 |
| 20 | VCC | Supply Voltage |
Applications:
- Microprocessor address latching.
- Data bus buffering.
- Memory interfacing.
- I/O port expansion.
- Embedded systems.
- Digital control systems.
- Industrial automation equipment.
- Data acquisition systems.
- Communication interfaces.
- Logic level buffering.
- Shared bus architectures.
- Instrumentation equipment.
Packages Included:
- 1x 74573 Octal D-Type Transparent Latch IC with 3-State Outputs 5V 70mA DIP-20.