Overview
The SN74HC595NSR 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 SN74HC595NSR 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 (SRCLR) input, a serial (SER) input, and serial outputs for cascading, allowing for flexible and efficient data transfer and storage.
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 Free-Air Temperature | -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 overriding clear (SRCLR) input
- Separate clocks for shift and storage registers
- Serial outputs for cascading
- Output-enable (OE) input to control output state
Applications
- Network switches
- Power infrastructure
- LED displays
- Servers
Q & A
- What is the operating voltage range of the SN74HC595NSR?
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 maximum power consumption of the SN74HC595NSR?
The maximum power consumption is 80 μA.
- What is the typical propagation delay of the SN74HC595NSR?
The typical propagation delay is 13 ns.
- What is the output drive capability at 5 V?
The output drive capability at 5 V is ±6 mA.
- What is the maximum input current?
The maximum input current is 1 μA.
- Does the SN74HC595NSR have a direct clear input?
Yes, the shift register has a direct overriding clear (SRCLR) input.
- Can the clocks for the shift and storage registers be connected together?
Yes, the clocks can be connected together, but the shift register will always be one clock pulse ahead of the storage register.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input controls the output state; when high, the outputs are in the high-impedance state.
- In what types of applications is the SN74HC595NSR commonly used?
The SN74HC595NSR is commonly used in network switches, power infrastructure, LED displays, and servers.
