Overview
The SN74HC595DW is an 8-bit serial-in, parallel-out shift register produced by Texas Instruments. It is part of the HC family of logic devices, designed for CMOS applications. This device features a wide operating voltage range of 2 V to 6 V, making it versatile for various electronic systems. The SN74HC595DW includes an 8-bit shift register that feeds an 8-bit D-type storage register, with separate clocks for both the shift and storage registers. The device also includes a direct overriding clear input, serial input, and serial outputs for cascading, along with high-current 3-state outputs that can drive up to 15 LSTTL loads.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 2 V) | 1.5 | 1.5 | 1.5 | V |
| VIH High-Level Input Voltage (VCC = 4.5 V) | 3.15 | 3.15 | 3.15 | V |
| VIH High-Level Input Voltage (VCC = 6 V) | 4.2 | 4.2 | 4.2 | V |
| VIL Low-Level Input Voltage (VCC = 2 V) | 0.5 | 0.5 | 0.5 | V |
| VIL Low-Level Input Voltage (VCC = 4.5 V) | 1.35 | 1.35 | 1.35 | V |
| VIL Low-Level Input Voltage (VCC = 6 V) | 1.8 | 1.8 | 1.8 | V |
| ICC Power Consumption (Max) | 80 | μA | ||
| tpd Propagation Delay (Typical) | 13 | ns | ||
| Output Drive at 5 V | ±6 | mA | ||
| Input Current (Max) | 1 | μA |
Key Features
- 8-bit serial-in, parallel-out shift register
- 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: 80-μA (maximum) ICC
- Typical propagation delay of 13 ns
- ±6-mA output drive at 5 V
- Low input current: 1 μA (maximum)
- Shift register has direct overriding clear (SRCLR) input
- Separate clocks for shift and storage registers
- Positive-edge triggered clocks
Applications
- Network switches
- Power infrastructure
- LED displays
- Servers
Q & A
- What is the operating voltage range of the SN74HC595DW?
The operating voltage range is from 2 V to 6 V.
- How many LSTTL loads can the high-current 3-state outputs drive?
The high-current 3-state outputs can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HC595DW?
The typical propagation delay is 13 ns.
- What is the maximum power consumption of the SN74HC595DW?
The maximum power consumption is 80 μA.
- Does the SN74HC595DW have a direct clear input?
Yes, the shift register has a direct overriding clear (SRCLR) input.
- Are the clocks for the shift and storage registers separate?
Yes, separate clocks are provided for both the shift and storage registers.
- What is the input current of the SN74HC595DW?
The maximum input current is 1 μA.
- Can the outputs be disabled?
Yes, when the output-enable (OE) input is high, the outputs are in the high-impedance state.
- What are some common applications of the SN74HC595DW?
Common applications include network switches, power infrastructure, LED displays, and servers.
- Are the clocks positive-edge triggered?
Yes, both the shift register clock (SRCLK) and storage register clock (RCLK) are positive-edge triggered.
