Logic - Shift Registers

Image	Part Number	Description / PDF	Quantity	Rfq
	CD4034BNSRE4 Texas Instruments	IC REGISTER CMOS BIDIRECT 24SO	0
	CY29FCT818CTPCG4 Texas Instruments	IC DIAGNOSTIC SCN REG 3ST 24DIP	0
	SN74HC595ANSRE4 Texas Instruments	IC REGISTER/LATCH 8BIT 3ST 16SO	0
	SN74ALS299DWRG4 Texas Instruments	IC REGISTER, MULTIPLEXED 20SOIC	0
	SN74LS597DRE4 Texas Instruments	IC SERIAL-OUT SHIFT-REG 16-SOIC	0
	CY29FCT520CTSOCG4 Texas Instruments	IC 8BIT PIPELINE REG 24-SOIC	0
	SN74LV166APWTG4 Texas Instruments	IC SHIFT REGISTER SGL 8B 16TSSOP	0
	SN74LS598DWE4 Texas Instruments	IC SHIFT REG 8BIT W/LTCH 20SOIC	0
	CD74HCT4094M96E4 Texas Instruments	IC BUS REG TRI-ST 8STG 16SOIC	0
	CY29FCT520ATPCG4 Texas Instruments	IC 8BIT PIPELINE REG 24-DIP	0
	SN74F299NSRE4 Texas Instruments	IC SHIFT/STORAGE REGISTER 20SO	0
	CY29FCT520CTSOCTE4 Texas Instruments	IC 8BIT PIPELINE REG 24-SOIC	0
	CD40194BPWE4 Texas Instruments	IC 4BIT BI-DIR SHIFT REG 16TSSOP	0
	CD74HC595NS Texas Instruments	IC SHIFT REGISTER 8-BIT 16SO	0
	CY29FCT520ATSOCTG4 Texas Instruments	IC 8BIT PIPELINE REG 24-SOIC	0
	CD4015BNSRG4 Texas Instruments	IC DUAL STATIC SHFT REG 16SO	0
	SN74LS594NSR Texas Instruments	IC SERIAL-IN SHIFT-REG 16SO	0
	SN74LV594ANSRG4 Texas Instruments	IC SHIFT REGISTER SGL 8B 16SO	0
	CD4034BPWRG4 Texas Instruments	IC REGSTR CMOS BIDIRECT 24-TSSOP	0
	CD74HCT670M96E4 Texas Instruments	IC 4X4 REGISTER FILE 3ST 16SOIC	0

Logic - Shift Registers

1. Overview

Logic shift registers are sequential logic circuits used to store and transfer data in digital systems. They consist of cascaded flip-flops controlled by a common clock signal, enabling data movement in serial or parallel formats. These ICs are fundamental in applications requiring data buffering, serial-to-parallel conversion, and timing control. Their importance spans modern computing, telecommunications, and embedded systems, where efficient data manipulation is critical.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Serial-In Parallel-Out (SIPO)	Converts serial data to parallel output	Communication interfaces (RS-232), data acquisition systems
Parallel-In Serial-Out (PISO)	Converts parallel data to serial output	Digital signal processing, sensor networks
Serial-In Serial-Out (SISO)	Shifts data in and out serially	Delay lines, data encryption
Parallel-In Parallel-Out (PIPO)	Direct parallel data transfer	CPU register files, memory buffers
Bidirectional Shift Registers	Supports left/right data movement	Arithmetic logic units (ALUs), network switches
Multifunction Shift Registers	Programmable shift directions and modes	FPGA I/O interfaces, test equipment

3. Structure and Composition

Typical shift register ICs are built using CMOS or TTL semiconductor processes. The core structure includes:

Cascaded Flip-Flops: D-type flip-flops connected in series for data storage stages
Control Logic: Clock dividers, direction control gates, and reset circuits
Input/Output Buffers: Level shifters and drivers for signal integrity
Power Distribution: VCC/GND rails with decoupling capacitors

Common packaging includes DIP, SOIC, and QFP formats with 8-48 pins. Advanced ICs integrate features like three-state outputs and error detection circuits.

4. Key Technical Specifications

Parameter	Description
Clock Frequency	Maximum operating frequency (1 MHz - 200 MHz), determines data transfer rate
Supply Voltage	Typical range 2.0V-5.5V for CMOS devices
Input/Output Type	CMOS/TTL compatibility, differential signaling (LVDS)
Propagation Delay	Time between clock edge and output change (ns range)
Power Consumption	Quiescent current ( A/MHz) and dynamic power dissipation
Operating Temperature	Industrial (-40 C to +85 C) or commercial (0 C to 70 C) ranges
Data Width	8/16/32/64-bit configurations

5. Application Areas

Telecommunications: Line drivers/receivers, protocol converters (USB/Ethernet)
Computing: CPU cache control, GPU memory interfaces
Industrial Automation: PLC data buses, motor controllers
Consumer Electronics: Display drivers (LCD/OLED), audio codecs
Automotive: CAN bus transceivers, ADAS sensor interfaces

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	SN74HC595N	8-bit SIPO, 3-state output, 100 MHz clock
NXP Semiconductors	74LVC164245	16-bit bidirectional, 2.3V-3.6V supply
STMicroelectronics	CD4014BM	8-stage PISO, 20V tolerant inputs
ON Semiconductor	MC74VHC164	Low power, 2V-5.5V operation
Microchip Technology	SRM74HC165	8-bit PISO with parallel load

7. Selection Guidelines

Define data interface type (serial/parallel, bidirectional)
Match clock speed requirements with propagation delay specifications
Verify voltage compatibility with host system (e.g., 3.3V/5V logic levels)
Consider package type based on PCB space constraints (TSSOP vs. QFN)
Evaluate temperature and reliability needs for industrial/automotive applications
Check for additional features like error detection or daisy-chaining support

8. Industry Development Trends

Integration: Combining shift registers with level shifters and protocol converters in single packages
Power Efficiency: Sub-1V operation and leakage current reduction for IoT devices
Higher Speeds: GDDR6/DDR5 memory interface ICs with >1 Gbps per pin performance
Miniaturization: WLCSP packages for wearable electronics (e.g., 0.4mm pitch devices)
Automotive Focus: AEC-Q100 qualified parts with fault-tolerant designs for ADAS systems
Intelligence: Embedded configuration registers and thermal shutdown protection