Overview
The SN74HC594DR is an 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register, manufactured by Texas Instruments. This device is part of the HC (High-Speed CMOS) logic family and is designed for a wide range of applications where data needs to be shifted and stored efficiently. It features separate clocks for the shift and storage registers, along with direct overriding clear inputs, making it versatile for various system designs.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC Supply Voltage | V | 2 | 5 | 6 |
| VIH High-Level Input Voltage (VCC = 6 V) | V | 4.2 | ||
| VIL Low-Level Input Voltage (VCC = 6 V) | V | 1.8 | ||
| TA Operating Free-Air Temperature | °C | -40 | 125 | |
| fmax Clock Frequency (VCC = 6 V) | MHz | 20 | ||
| tpd Propagation Delay (SRCLK to QH') | ns | 15 | 25 | 38 |
| tPHL Propagation Delay (RCLR to QA-QH) | ns | 15 | 21 | 31 |
| Cpd Power Dissipation Capacitance | pF | 395 | ||
| RθJA Junction-to-Ambient Thermal Resistance (SOIC) | °C/W | 72.3 |
Key Features
- 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register.
- Separate clocks for shift and storage registers (SRCLK and RCLK).
- Direct overriding clear inputs (SRCLR and RCLR).
- High-current outputs capable of driving up to 15 LSTTL loads.
- Low power consumption, suitable for battery-powered applications.
- Wide operating voltage range: 2 V to 6 V.
- High noise immunity and low power dissipation.
- Cascading capability via the QH’ output.
Applications
- Pro Audio Mixers
- Elevators and Escalators
- Human Machine Interface (HMI): Industrial
- Entertainment Systems
- Grid Infrastructure: Grid Control
- Access Control and Security: DVR and DVS
- Bus interface type applications where output ringing is a concern.
Q & A
- What is the primary function of the SN74HC594DR?
The primary function is to act as an 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register. - What are the separate clocks used for in the SN74HC594DR?
The separate clocks, SRCLK and RCLK, are used for the shift register and the storage register, respectively. - What is the purpose of the SRCLR and RCLR inputs?
The SRCLR and RCLR inputs are used for direct overriding clear of the shift register and storage register, respectively. - What is the output drive capability of the SN74HC594DR?
The outputs can drive up to 15 LSTTL loads. - What is the operating voltage range of the SN74HC594DR?
The operating voltage range is from 2 V to 6 V. - How does the SN74HC594DR handle cascading?
Cascading is handled via the QH’ output. - What are some typical applications of the SN74HC594DR?
Typical applications include pro audio mixers, elevators and escalators, HMI in industrial settings, entertainment systems, grid infrastructure, and access control and security systems. - What is the thermal resistance of the SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the SOIC package is approximately 72.3°C/W. - What is the maximum clock frequency for the SN74HC594DR at VCC = 6 V?
The maximum clock frequency is 20 MHz. - How does the SN74HC594DR manage power consumption?
The device has low power consumption, making it suitable for battery-powered applications.
