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SN74HC595N

8-bit shift register with latch, 3-state outputs, 78MHz, 2-6V, PDIP-16

16200

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Pieza del fabricante：

SN74HC595N

Paquete：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch)

Marca：

Categorías de productos：

Circuitos integrados IC, Circuitos integrados de interfaz

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Descripción

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The SN74HC595N is an 8-bit shift register with output latch and 3-state outputs from Texas Instruments, designed for serial-to-parallel data conversion with 78MHz typical shift frequency in a 16-pin PDIP package.

Especificaciones

Función	8-bit shift register with output latch
Shift Frequency	78MHz typical at 4.5V
Tensión de alimentación	2V to 6V
Output Drive	6mA sink/source at 4.5V
Retardo de propagación	13ns typical (clock to Q)
Output Types	3-state (direct and latched)
Serial Output	Q7′ for cascading
Shift Register Clear	Active low (SRCLR)
Output Enable	Active low (OE)
Supply Current	80µA maximum at 6V
Temperatura de funcionamiento	-40°C to +85°C
Paquete	PDIP-16 (19.3 x 6.35mm)

Características

8-bit serial-in, parallel-out shift register with output latch
3-state outputs for bus-oriented applications
Direct clear of shift register (SRCLR)
Output enable for high-impedance state
Q7′ cascade output for daisy-chaining multiple devices
Separate clock inputs for shift and latch registers
Wide 2V to 6V supply voltage range
Standard HC CMOS logic levels

Aplicaciones

LED display driving and multiplexing
Expanding MCU output ports
Serial-to-parallel data conversion
Cascaded register chains
Industrial control output expansion

Introducción del producto:SN74HC595N Presentación del producto

The SN74HC595N is an 8-bit shift register with output latch and 3-state outputs from Texas Instruments in the 74HC CMOS logic family. It provides serial-to-parallel data conversion with two stages: an 8-bit shift register that accepts serial data on the rising edge of the shift register clock (SRCLK), and an 8-bit output latch that captures the shift register contents on the rising edge of the register clock (RCLK). The 3-state outputs can be placed in high-impedance via the output enable (OE) pin. A Q7′ serial output enables daisy-chaining multiple 74HC595 devices for unlimited output expansion. The active-low shift register clear (SRCLR) resets the shift register independently of the output latch. The device operates from 2V to 6V with 78MHz typical shift frequency at 4.5V.

Principio de funcionamiento:SN74HC595N Principio de funcionamiento

The SN74HC595N consists of two 8-bit registers: the shift register and the output latch register. Serial data on the SER (DS) input is shifted into the shift register on each rising edge of SRCLK. The data propagates from bit 0 through bit 7, with the bit 7 value appearing on the Q7′ output for cascading to the next device. When RCLK rises, the entire shift register content is transferred simultaneously to the output latch register, updating all 8 outputs (Q0-Q7) at once. This two-stage architecture allows new data to be shifted in while the current output remains stable, preventing flicker in display applications. The SRCLR pin asynchronously clears the shift register to all lows when driven low, but does not affect the output latch, allowing selective clearing. The OE pin controls the 3-state output buffers; when OE is high, all Q0-Q7 outputs are in high-impedance, while the internal latch data and Q7′ remain active. The 6mA output drive capability can directly drive LEDs, relay coils, and other low-current loads without additional buffers.

Descripción de la clavija:SN74HC595N Definición y funciones de las clavijas

Pin	Nombre	Tipo	Descripción
1	Q1	3-state Output	Latched output bit 1
2	Q2	3-state Output	Latched output bit 2
3	Q3	3-state Output	Latched output bit 3
4	Q4	3-state Output	Latched output bit 4
5	Q5	3-state Output	Latched output bit 5
6	Q6	3-state Output	Latched output bit 6
7	Q7	3-state Output	Latched output bit 7
8	GND	Potencia	Suelo
9	Q7′	Salida	Serial cascade output (not latched)
10	SRCLR	Entrada	Shift register clear (active low)
11	SRCLK	Entrada	Shift register clock (rising edge)
12	RCLK	Entrada	Register (latch) clock (rising edge)
13	OE	Entrada	Output enable (active low, 3-state control)
14	SER	Entrada	Entrada de datos serie
15	Q0	3-state Output	Latched output bit 0
16	VCC	Potencia	Supply voltage (2V-6V)

Application Scenarios:In which products and applications isSN74HC595N usado

LED Matrix Driving: 3-state outputs and latch prevent flicker; multiple devices cascade to drive 8×8 or larger LED matrices
MCU Port Expansion: 3 GPIO pins (SER, SRCLK, RCLK) control 8 or more outputs via serial shift, conserving MCU I/O
Seven-Segment Displays: Latch enables simultaneous digit update; OE controls display blanking during multiplexing
Control industrial: 6mA per output drives optocouplers and relay coils; daisy-chain expands to hundreds of channels
Serial-to-Parallel: Converts SPI or bit-banged serial data from MCU to parallel control signals for multiple peripherals

Alternative Models:What chips are recommended as replacements for SN74HC595N

Modelo	Fabricante	Diferencia clave	Paquete	Supply
74HC595D	TI/Nexperia	CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity	SOIC-16	2-6V CMOS
74HC595N	TI/Nexperia	Through-hole DIP version of HC family for prototyping and repair	DIP-16	2-6V CMOS
74HCT595D	TI/Nexperia	CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V	SOIC-16	4.5-5.5V TTL-in
74HCT595N	TI/Nexperia	Through-hole DIP version of HCT family for prototyping and repair	DIP-16	4.5-5.5V TTL-in
74LVC595D	TI/Nexperia	Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs	SOIC-16	1.65-3.6V CMOS
74LVC595N	TI/Nexperia	Through-hole DIP version of LVC family for prototyping and repair	DIP-16	1.65-3.6V CMOS
74AUP595D	TI/Nexperia	Ultra-low power CMOS with 0.8-3.6V supply for battery-powered and mobile applications	SOIC-16	0.8-3.6V CMOS
74AUP595N	TI/Nexperia	Through-hole DIP version of AUP family for prototyping and repair	DIP-16	0.8-3.6V CMOS

The 74595 is a 8-Bit Shift Register with Output Latches and 3-State Output. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.