Overview
The 74HC595DG, produced by ON Semiconductor, is a high-performance 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs. This device is fabricated using silicon gate CMOS technology, offering high-speed operation while maintaining low power dissipation. It consists of an 8-bit shift register and an 8-bit D-type latch, allowing for both serial and parallel data output. The shift register and latch have independent clock inputs, and the device includes an asynchronous reset for the shift register. This makes it suitable for a variety of digital circuit applications, including interfacing with SPI serial data ports on CMOS microprocessors and microcontrollers.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 2.0 | 6.0 | V | ||
| Input Voltage (VIN) | 0 | VCC | V | ||
| Output Voltage (VOUT) | 0 | VCC | V | ||
| Operating Temperature (Topr) | -40 | 125 | °C | ||
| Maximum Clock Frequency (fmax) | VCC = 2.0 V | 6.0 | MHz | ||
| Maximum Clock Frequency (fmax) | VCC = 4.5 V | 35 | MHz | ||
| Propagation Delay, Shift Clock to SQH (tPLH, tPHL) | VCC = 2.0 V | 140 | 210 | ns | |
| Input Rise and Fall Time (tr, tf) | VCC = 2.0 V | 0 | 1000 | ns | |
| Supply Current (ICC) | VCC = 6.0 V | 160 | μA | ||
| Input Capacitance (CI) | 3.5 | pF |
Key Features
- 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs.
- Independent clock inputs for the shift register and latch.
- Asynchronous reset for the shift register.
- Output drive capability: 15 LSTTL loads.
- Outputs directly interface with CMOS, NMOS, and TTL.
- Operating voltage range: 2.0 to 6.0 V.
- Low input current: 1.0 μA.
- High noise immunity characteristic of CMOS devices.
- ESD performance: HBM ≥ 2000 V; Machine Model ≥ 200 V.
- Improvements over HC595: improved propagation delays, 50% lower quiescent power, and improved input noise and latchup immunity.
Applications
- Interfacing with SPI serial data ports on CMOS microprocessors and microcontrollers.
- Display drivers and LED drivers.
- Serial to parallel data conversion.
- Cascading shift registers for larger data widths.
- General-purpose digital circuitry requiring serial-in/parallel-out data conversion.
Q & A
- What is the primary function of the 74HC595DG?
The primary function of the 74HC595DG is to act as an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs.
- What is the operating voltage range of the 74HC595DG?
The operating voltage range of the 74HC595DG is from 2.0 to 6.0 V.
- How many LSTTL loads can the 74HC595DG drive?
The 74HC595DG can drive up to 15 LSTTL loads.
- What is the maximum clock frequency for the 74HC595DG at VCC = 4.5 V?
The maximum clock frequency for the 74HC595DG at VCC = 4.5 V is 35 MHz.
- Does the 74HC595DG have an asynchronous reset?
Yes, the 74HC595DG has an asynchronous reset for the shift register.
- What is the input rise and fall time for the 74HC595DG at VCC = 2.0 V?
The input rise and fall time for the 74HC595DG at VCC = 2.0 V is up to 1000 ns.
- How much supply current does the 74HC595DG consume at VCC = 6.0 V?
The supply current consumption of the 74HC595DG at VCC = 6.0 V is up to 160 μA.
- What is the input capacitance of the 74HC595DG?
The input capacitance of the 74HC595DG is approximately 3.5 pF.
- Can the 74HC595DG be cascaded with other shift registers?
Yes, the 74HC595DG can be cascaded with other shift registers using its serial input and output pins.
- Is the 74HC595DG Pb-free?
Yes, the 74HC595DG is a Pb-free device.
