SN74HC595 Shift Register IC ?C 8-Bit Serial to Parallel | Texas Instruments DIP

SN74HC595 Serial-In Parallel-Out Shift Register with Storage Register

Le SN74HC595 is a widely adopted 8-bit serial-in, parallel-out shift register with tri-state output buffers, manufactured by Texas Instruments. This device is particularly suited for expanding the output capabilities of microcontrollers and embedded processors in space-constrained digital systems. Each register includes a storage register and a serial-to-parallel shift register, making it a reliable solution for efficient and synchronized output control in timing-sensitive applications.

With operation across a 2V to 6V power supply range, and outputs capable of sourcing or sinking TTL-level current, the SN74HC595 meets the voltage and current demands of most logic families. Through Fabricant de circuits intégrés, verified component sourcing and consistent delivery are ensured, supporting the performance integrity in industrial-grade builds.

Electrical Characteristics and Performance Specifications

Paramètres	Valeur	Unité
Bits	8	–
Supply Voltage Range (Vcc)	2 ?C 6	V
Max Clock Frequency (at 6V)	100	MHz
Propagation Delay (tpd)	15 (typ)	ns
Courant de sortie	??6	mA
Type d'emballage	DIP-16	–
Plage de température	De -40 à +85	??C

Advantages Over Conventional Output Expansion Techniques

• Integrated Storage Register: Allows output latching independent of shift register operation, minimizing flicker in LED arrays.
• Tri-State Outputs: Simplifies bus integration by allowing multiple ICs on the same data line.
• Flexible Voltage Operation: Compatible with both low-power 3.3V and standard 5V logic families.
• Compact Implementation: Reduces GPIO requirements while expanding output capacity by 8 bits per IC.
• Fast Propagation Time: Supports high-speed serial input up to 100 MHz for rapid state updates.

Technical Parameter Table

Fonctionnalité	Description
Fonction	Serial-In Parallel-Out Shift Register with Output Latch
Type de sortie	Tri-State
Data Output Control	Storage Register + OE Pin
Clock Type	Positive-Edge Triggered
Power Supply	2V to 6V
Output Enable	Active LOW
Famille logique	HC CMOS

Applications typiques

• Microcontroller I/O Port Expansion
• LED Segment and Matrix Displays
• Industrial Control Panels
• Digital Interface Multiplexers
• Systèmes d'acquisition de données

Foire aux questions (FAQ)

What is the core purpose of the SN74HC595?

The SN74HC595 expands microcontroller I/O by converting a serial data stream into an 8-bit parallel output. It helps conserve GPIO pins while providing precise output control.

Can the SN74HC595 chips be cascaded for more outputs?

Yes, the devices can be chained via their QH?? and SER pins, allowing for nearly unlimited parallel expansion in 8-bit increments.

What is the benefit of the internal storage register?

It enables outputs to be updated simultaneously after all bits are shifted in, which is crucial for controlling displays and avoiding unwanted intermediate states.

How is data transferred into and out of the IC?

Data enters serially via the SER pin and shifts on the rising edge of the clock (SRCLK). The data is then latched to the outputs using the RCLK pin.

What package options are available?

SN74HC595 is available in DIP-16, SOIC, and TSSOP formats, with DIP being ideal for through-hole applications and prototyping purposes.