Overview
The 74HC595PW/C1118 is an 8-bit serial-in/serial or parallel-out shift register produced by NXP USA Inc., now part of Nexperia. This integrated circuit is designed to receive data serially and control 8 output pins in parallel, making it highly useful in applications where the number of GPIO pins on a microcontroller is limited. The device features a storage register and 3-state outputs, with separate clocks for the shift and storage registers. It also includes an asynchronous reset input and supports cascading for expanded output capabilities.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| VCC | 2.0 - 6.0 V | Operating voltage range |
| Logic Switching Levels | CMOS | For 74HC595; TTL for 74HCT595 |
| Output Drive Capability | ± 7.8 mA | Maximum output current |
| tpd | 16 ns | Propagation delay |
| fmax | 108 MHz (typical) | Maximum clock frequency |
| Number of Bits | 8 | Number of bits in the shift register |
| Power Dissipation | Low | Power dissipation considerations |
| Tamb | -40 °C to +125 °C | Operating temperature range |
| Package | TSSOP16 (SOT403-1) | Package type |
Key Features
- 8-bit serial input and serial or parallel output
- Storage register with 3-state outputs
- Shift register with direct clear (asynchronous reset)
- 100 MHz (typical) shift out frequency
- ESD protection: HBM (ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V), CDM (ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V)
- Multiple package options available
- Wide operating voltage range from 2V to 6V
- Low power consumption (80 uA)
- Output source/sink current: 35 mA
- Cascading capability for expanded output control
Applications
The 74HC595PW/C1118 is commonly used in various applications where the expansion of GPIO pins is necessary. Some key applications include:
- Controlling a large number of LEDs through a microcontroller.
- Interfacing with LCD screens by acting as data bits for the displays.
- Controlling 5V loads like relays through a 3.3V microcontroller.
- Expanding the output capabilities of microcontrollers or microprocessors.
Q & A
- What is the primary function of the 74HC595PW/C1118?
The primary function is to act as an 8-bit serial-in/serial or parallel-out shift register, allowing serial data input and parallel output control.
- What is the operating voltage range of the 74HC595PW/C1118?
The operating voltage range is from 2.0 V to 6.0 V.
- What are the logic switching levels for the 74HC595PW/C1118?
The logic switching levels are CMOS for the 74HC595 and TTL for the 74HCT595.
- How many output pins does the 74HC595PW/C1118 have?
The device has 8 output pins (Q0 to Q7).
- What is the maximum clock frequency for the 74HC595PW/C1118?
The maximum clock frequency is typically 108 MHz.
- Can the 74HC595PW/C1118 be cascaded?
- What is the purpose of the OE (Output Enable) pin?
The OE pin is used to enable or disable the outputs. When OE is LOW, the outputs are enabled; when OE is HIGH, the outputs are in a high-impedance OFF-state.
- What is the purpose of the MR (Master Reset) pin?
The MR pin is used to reset the shift register. A LOW on MR will reset the shift register.
- What are the typical applications of the 74HC595PW/C1118?
Typical applications include controlling LEDs, interfacing with LCD screens, and controlling 5V loads through a 3.3V microcontroller.
- What is the operating temperature range of the 74HC595PW/C1118?
The operating temperature range is from -40 °C to +125 °C.
