Overview
The MC74HC595AF, produced by ON Semiconductor, is an 8-bit serial-input/serial or parallel-output shift register with latched 3-state outputs. This device combines an 8-bit shift register and an 8-bit D-type latch, allowing for flexible data handling and output configurations. It is designed for high-performance applications and is compatible with both CMOS and TTL logic levels.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VCC) | –0.5 to +6.5 | V |
| DC Input Voltage (VIN) | –0.5 to VCC + 0.5 | V |
| DC Output Voltage (VOUT) | –0.5 to VCC + 0.5 | V |
| DC Input Current, per Pin (IIN) | ±20 | mA |
| DC Output Current, per Pin (IOUT) | ±35 | mA |
| DC Supply Current, VCC and GND Pins (ICC) | ±75 | mA |
| Storage Temperature (TSTG) | –65 to +150 | °C |
| Lead Temperature, 1 mm from Case for 10 Seconds (TL) | 260 | °C |
| Junction Temperature Under Bias (TJ) | ±150 | °C |
| Maximum Clock Frequency (fmax) at VCC = 4.5V | 30 MHz | MHz |
| Maximum Propagation Delay, Shift Clock to SQH at VCC = 4.5V | 28 ns | ns |
Key Features
- 8-bit serial-input/serial or parallel-output shift register with latched 3-state outputs.
- High-performance Silicon-Gate CMOS technology.
- Inputs compatible with Standard CMOS and TTL outputs.
- Output drive capability: 15 LSTTL loads.
- Independent clock inputs for shift register and latch.
- Asynchronous reset for the shift register.
- Direct interface with SPI serial data port on CMOS MPUs and MCUs.
- Active-low output enable allows data from latches to be presented at outputs or forces outputs into high-impedance state.
Applications
- Microcontroller and microprocessor systems requiring serial-to-parallel data conversion.
- Display drivers and LED drivers where serial data needs to be converted to parallel outputs.
- Automotive and industrial control systems where robust and reliable data handling is necessary.
- Communication systems that require efficient data transfer and storage.
- Embedded systems and IoT devices needing compact and efficient data management.
Q & A
- What is the primary function of the MC74HC595AF?
The MC74HC595AF is an 8-bit serial-input/serial or parallel-output shift register with latched 3-state outputs, allowing for serial data input and both serial and parallel output configurations.
- What are the compatible input logic levels for the MC74HC595AF?
The inputs are compatible with Standard CMOS and TTL outputs.
- What is the maximum clock frequency for the MC74HC595AF at VCC = 4.5V?
The maximum clock frequency is 30 MHz at VCC = 4.5V.
- How does the output enable pin function?
The active-low output enable pin allows the data from the latches to be presented at the outputs or forces the outputs into a high-impedance state.
- What is the effect of the reset pin on the device?
The reset pin is an active-low, asynchronous reset input that resets the shift register portion of the device but does not affect the latch.
- What are the storage temperature limits for the MC74HC595AF?
The storage temperature range is –65°C to +150°C.
- Can the MC74HC595AF be used in automotive applications?
- How many LSTTL loads can the MC74HC595AF drive?
The MC74HC595AF can drive up to 15 LSTTL loads.
- What is the thermal resistance of the MC74HC595AF?
The thermal resistance (θJA) varies depending on the package type, but it is specified in the datasheet for different configurations.
- Can the MC74HC595AF be used in embedded systems?
