Overview
The CD74HC595DW is an 8-bit serial-in, parallel-out shift register with 3-state output registers, 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 requiring serial-to-parallel data conversion. The CD74HC595DW features separate clocks for both the shift and storage registers, allowing for flexible data manipulation. It also includes a direct overriding clear input and a serial output for cascading multiple devices. The outputs are high-impedance when the output-enable input is high, making it suitable for various digital circuit designs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Supply Voltage | - | -0.5 | - | 7 | V |
| Operating Voltage Range | - | 2 | - | 6 | V |
| Input Clamp Current (IIK) | VI < 0 or VI > VCC | -20 | - | 20 | mA |
| Output Drive Current (IOH/IOL) | At VCC = 5 V | -6 | - | 6 | mA |
| Propagation Delay Time (tpd) | At VCC = 5 V | 14 | - | - | ns |
| Clock Frequency (fclk) | At VCC = 5 V | - | - | 31 | MHz |
| Power Consumption (ICC) | At VCC = 5 V | - | - | 80 | µA |
| Input Current (II) | At VCC = 5 V | - | - | 1 | µA |
Key Features
- 8-bit serial-in, parallel-out shift register with 3-state outputs
- Wide operating voltage range of 2 V to 6 V
- High-current 3-state outputs can drive up to 15 LSTTL loads
- Low power consumption, with a maximum ICC of 80 µA
- Typical propagation delay time (tpd) of 14 ns
- ±6-mA output drive at 5 V
- Low input current of 1 µA max
- Direct overriding clear input (SRCLR) and serial output for cascading
- Separate clocks for shift and storage registers
Applications
- Display drivers and LED drivers
- Data transmission and reception in serial communication systems
- Microcontroller and microprocessor interfaces
- Digital signal processing and control systems
- Cascaded shift register applications for expanding data width
Q & A
- What is the operating voltage range of the CD74HC595DW?
The operating voltage range of the CD74HC595DW is from 2 V to 6 V.
- What is the maximum output drive current of the CD74HC595DW?
The maximum output drive current is ±6 mA at VCC = 5 V.
- How many LSTTL loads can the CD74HC595DW drive?
The CD74HC595DW can drive up to 15 LSTTL loads.
- What is the typical propagation delay time (tpd) of the CD74HC595DW?
The typical propagation delay time (tpd) is 14 ns.
- Does the CD74HC595DW have a direct clear input?
Yes, the CD74HC595DW has a direct overriding clear input (SRCLR).
- Can the CD74HC595DW be cascaded with other shift registers?
Yes, the CD74HC595DW has a serial output for cascading multiple devices.
- What is the maximum clock frequency for the CD74HC595DW?
The maximum clock frequency is 31 MHz at VCC = 5 V.
- What is the power consumption of the CD74HC595DW?
The maximum power consumption (ICC) is 80 µA.
- What are the package options available for the CD74HC595?
The CD74HC595 is available in PDIP, SOIC-DW, SOIC-D, SO, and SSOP packages.
- How should unused inputs be handled in the CD74HC595DW?
Unused inputs must be connected to a logic high or logic low voltage to prevent them from floating.
