Overview
The SN74HC595DRE4 is an 8-bit serial-in, parallel-out shift register produced by Texas Instruments. This device is part of the HC family of logic devices, designed for CMOS applications. It features an 8-bit shift register that feeds an 8-bit D-type storage register, with parallel 3-state outputs. The device includes separate clocks for both the shift and storage registers, along with a direct overriding clear input and serial outputs for cascading. When the output-enable input is high, the outputs are in the high-impedance state.
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 | ||
| Operating Temperature Range | -40 | 85 | °C |
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 clear (SRCLR) input
- Separate clocks for shift and storage registers
- Serial outputs for cascading
- Outputs in high-impedance state when output-enable (OE) input is high
Applications
- Network switches
- Power infrastructure
- LED displays
- Servers
- Other applications requiring serial-to-parallel data conversion
Q & A
- What is the operating voltage range of the SN74HC595DRE4?
The operating voltage range is from 2 V to 6 V.
- How many bits does the shift register have?
The shift register is 8 bits.
- What is the maximum power consumption of the SN74HC595DRE4?
The maximum power consumption is 80 µA.
- What is the typical propagation delay of the SN74HC595DRE4?
The typical propagation delay is 13 ns.
- Can the outputs drive LSTTL loads?
Yes, the high-current 3-state outputs can drive up to 15 LSTTL loads.
- What is the input current of the SN74HC595DRE4?
The maximum input current is 1 µA.
- Does the shift register have a direct clear input?
Yes, the shift register has a direct overriding clear (SRCLR) input.
- Can the outputs be cascaded?
Yes, the device has serial outputs for cascading.
- What happens to the outputs when the output-enable (OE) input is high?
The outputs are in the high-impedance state when the output-enable (OE) input is high.
- What is the operating temperature range of the SN74HC595DRE4?
The operating temperature range is from -40°C to 85°C.
