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74HC595PW

8-bit shift register with output latch, 100MHz shift, tri-state output, daisy-chain capable in TSSOP-16

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Pieza del fabricante：

74HC595PW

Paquete：

TSSOP-16 (5.00 x 4.40 x 1.00 mm)

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Descripción

Productos

The 74HC595PW from Nexperia is an 8-bit shift register with output latch and tri-state output in a TSSOP-16 package. It converts serial data to parallel output, enabling microcontrollers to control many outputs using only three GPIO pins. The device supports shift frequencies up to 100MHz and daisy-chain cascading for unlimited output expansion.

Especificaciones

Logic Family 74HC
Supply Voltage Range 2.0V ~ 6.0V
Output Drive +/-7.8mA @ VCC=6V
Retardo de propagación 13ns (Typical) @ VCC=6V
Shift Frequency 100MHz (Typical) @ VCC=6V
Serial Input 1 (DS)
Parallel Output 8 (Q0-Q7)
Serial Output 1 (Q7 prime)
Output Enable Yes (OE, active low)
Master Reset Yes (MR, active low)
Paquete TSSOP-16 (5.00 x 4.40mm)
Temperatura de funcionamiento -40°C ~ +125°C

Características

  • 8-bit serial-in, parallel-out shift register with output latch
  • Separate clock inputs for shift register and output latch
  • Tri-state outputs for bus-oriented applications
  • Asynchronous master reset clears shift register
  • Serial output (Q7 prime) for daisy-chain cascading
  • Wide 2.0V to 6.0V supply range

Aplicaciones

  • LED matrix and display drivers
  • GPIO expansion for microcontrollers
  • Relay and solenoid multiplexing
  • Digital input multiplexing
  • Cascaded output expansion systems

The 74HC595PW from Nexperia is an 8-bit serial-in, parallel-out shift register with output latches and tri-state outputs. It is one of the most widely used logic ICs for GPIO expansion, enabling a microcontroller to control 8 or more outputs using only three pins: serial data (DS), shift clock (SHCP), and latch clock (STCP). The device features separate shift register and output latch sections, allowing the shift register to be loaded while the output latch holds the previous data, preventing output glitches. The serial output (Q7 prime) enables unlimited daisy-chain cascading by connecting it to the DS input of the next device. The tri-state output enable (OE) allows the outputs to be disconnected from the bus, useful in multiplexed or shared-bus configurations.

The 74HC595 consists of two main sections: an 8-bit shift register and an 8-bit output latch with tri-state buffers. Serial data is shifted into the shift register on the rising edge of the shift clock (SHCP). After 8 bits have been shifted in, the data is transferred to the output latch by a rising edge on the latch clock (STCP). The outputs (Q0-Q7) then reflect the latched data. The output enable (OE) controls the tri-state buffers; when OE is high, the outputs are high-impedance. The master reset (MR) asynchronously clears the shift register without affecting the output latch. The Q7 prime output provides the serial data output from the eighth stage of the shift register, which is used to cascade multiple 74HC595 devices. The latch clock and shift clock are independent, allowing data to be shifted in while the outputs remain stable.

Pin Nombre Función
1 Q1 Parallel output bit 1
2 Q2 Parallel output bit 2
3 Q3 Parallel output bit 3
4 Q4 Parallel output bit 4
5 Q5 Parallel output bit 5
6 Q6 Parallel output bit 6
7 Q7 Parallel output bit 7
8 GND Suelo
9 Q7 prime Serial output for cascading
10 MR Master Reset (active low)
11 SHCP Shift register clock input
12 STCP Storage register clock (latch)
13 OE Output Enable (active low)
14 DS Entrada de datos serie
15 Q0 Parallel output bit 0
16 VCC Supply voltage (2.0V-6.0V)
  • LED Matrix Driver: 3 GPIO pins control 8 LEDs per chip; daisy-chain multiple 74HC595s to drive 64+ LED matrices from a single SPI bus
  • GPIO Expansion for MCU: Adds 8 digital outputs per chip using only 3 MCU pins; cascade for 16, 24, 32+ outputs
  • Relay Board Multiplexer: Controls 8 relay channels with tri-state output enabling hot-swap of relay modules
  • 7-Segment Display Multiplexing: Drives segment and digit selects for multiplexed 7-segment displays with minimal MCU resources
Modelo Fabricante Diferencia clave
74HC595D Nexperia Same, SOIC-16 package
SN74HC595DWR TI Same, SOIC-16, 2-6V
74HC595D Toshiba Same, SOIC-16, AEC-Q100
74HC165D Nexperia 8-bit parallel-in serial-out (input shift register)
74HC595D ST Same, SOIC-16
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