Overview
The SN74HC594N, produced by Texas Instruments, is an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. This device is part of the HC (High-Speed CMOS) logic family and is designed for a wide range of digital applications. It features separate clocks for both the shift and storage registers, along with direct overriding clear inputs (RCLR, SRCLR) for each register. The shift register and storage register clocks are positive edge triggered, allowing for synchronized data transfer. The device also includes a serial output (QH’) for cascading multiple shift registers.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | - | 6 | V |
| VIH High-Level Input Voltage | 1.5 (VCC=2V) | - | 4.2 (VCC=6V) | V |
| VIL Low-Level Input Voltage | 0.5 (VCC=2V) | - | 1.8 (VCC=6V) | V |
| TA Operating Free-Air Temperature | -55 | - | 125 | °C |
| SRCLK Clock Frequency | 4 (VCC=2V) | - | 29 (VCC=6V) | MHz |
| Output Current (IOL) | -20 | - | 7.8 | mA |
Key Features
- 8-bit serial-in, parallel-out shift register feeding an 8-bit D-type storage register.
- Wide operating voltage range of 2 V to 6 V.
- High-current outputs capable of driving up to 15 LSTTL loads.
- Separate clocks for shift and storage registers.
- Direct overriding clear inputs (RCLR, SRCLR) for both registers.
- Serial output (QH’) for cascading purposes.
- Positive edge triggered clocks.
Applications
- LED displays and other display systems.
- Network switches and communication equipment.
- Power infrastructure and control systems.
- Servers and data storage systems.
- General digital logic and data processing applications.
Q & A
- What is the SN74HC594N?
The SN74HC594N is an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register, produced by Texas Instruments.
- What is the operating voltage range of the SN74HC594N?
The operating voltage range is from 2 V to 6 V.
- How many LSTTL loads can the outputs of the SN74HC594N drive?
The outputs can drive up to 15 LSTTL loads.
- What type of clocks does the SN74HC594N use?
The device uses positive edge triggered clocks for both the shift and storage registers.
- Can the SN74HC594N be cascaded?
- What are the typical applications of the SN74HC594N?
Typical applications include LED displays, network switches, power infrastructure, servers, and general digital logic systems.
- What is the maximum clock frequency for the SN74HC594N?
The maximum clock frequency is 29 MHz at VCC = 6 V.
- How should unused inputs be handled on the SN74HC594N?
All unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the operating temperature range for the SN74HC594N?
The operating temperature range is from -55°C to 125°C.
- Does the SN74HC594N have direct clear inputs?
