Overview
The SN74HC595B, produced by Texas Instruments, is an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. This device is part of the HC family of logic devices, designed for CMOS applications. It features separate clocks for both the shift register and the storage register, allowing for flexible data manipulation. The SN74HC595B is available in an ultra-small logic QFN package with a maximum height of 0.5 mm, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Unit | Min | Nom | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5 | 6 |
| VIH (High-Level Input Voltage) | V | 1.5 (VCC = 2 V) | 3.15 (VCC = 4.5 V) | 4.2 (VCC = 6 V) |
| VIL (Low-Level Input Voltage) | V | 0.5 (VCC = 2 V) | 1.35 (VCC = 4.5 V) | 1.8 (VCC = 6 V) |
| Δt/Δv (Input Transition Rise or Fall Time) | ns | 1000 (VCC = 2 V) | 500 (VCC = 4.5 V) | 400 (VCC = 6 V) |
| TA (Operating Free-Air Temperature) | °C | -55 | 125 | |
| tpd (Propagation Delay Time) | ns | 50 (VCC = 2 V) | 17 (VCC = 4.5 V) | 14 (VCC = 6 V) |
| ICC (Maximum Low Power Consumption) | μA | 80 | ||
| IO (Continuous Output Current) | mA | ±35 |
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: 80-μA (maximum) ICC
- Low input current: 1 μA (maximum)
- ±6-mA output drive at 5 V
- Shift register has direct clear (SRCLR) input
- Over-voltage tolerant on inputs independent of Vcc
- Available in ultra-small logic QFN package (0.5 mm max height)
- Operating temperature range: -55°C to 125°C
Applications
- Network switches
- Factory automation
- Mobile wearables
- Industrial building automation
- Power infrastructure
- LED displays
- Servers
Q & A
- What is the operating voltage range of the SN74HC595B?
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 low power consumption of the SN74HC595B?
The maximum low power consumption is 80 μA.
- What is the input current of the SN74HC595B?
The input current is 1 μA (maximum).
- What is the output drive capability at 5 V?
The output drive capability at 5 V is ±6 mA.
- Does the SN74HC595B have a direct clear input?
Yes, the shift register has a direct overriding clear (SRCLR) input.
- What is the operating temperature range of the SN74HC595B?
The operating temperature range is from -55°C to 125°C.
- In what package is the SN74HC595B available?
The SN74HC595B is available in an ultra-small logic QFN package with a maximum height of 0.5 mm.
- Are the inputs of the SN74HC595B over-voltage tolerant?
Yes, the inputs are over-voltage tolerant independent of Vcc.
- What are some common applications of the SN74HC595B?
Common applications include network switches, factory automation, mobile wearables, industrial building automation, power infrastructure, LED displays, and servers.
