Logic - Shift Registers

Part Number	Description / PDF	Quantity
CD4021BEG4 Texas Instruments	IC STATIC SHFT REG 8STG 16-DIP	0
SN54LS166AJ Texas Instruments	54LS166A PARALLEL-LOAD 8-BIT SHI	352
CD74HC670M Texas Instruments	IC REGISTER FILE 4X4 HS 16-SOIC	430
SN74ALS323DW Texas Instruments	PARALLEL IN PARALLEL OUT	3265
SN74HC165QPWRG4Q1 Texas Instruments	SN74HC165-Q1 AUTOMOTIVE CATALOG	14981
SN5491AJ Texas Instruments	SERIAL IN SERIAL OUT	0
CD74HC164MT Texas Instruments	IC SHIFT REGISTER 8BIT HS 14SOIC	46
SN74HC595ANS Texas Instruments	IC REGISTER/LATCH 8BIT 3ST 16SO	13455
TPIC6C595PWG4 Texas Instruments	IC PWR 8-BIT SHIFT REGIS 16TSSOP	478
SN74ALS164AD Texas Instruments	IC 8-BIT SHIFT REGISTER 14-SOIC	250
CD74HC166E Texas Instruments	IC SHIFT REGISTER 8BIT HS 16DIP	654
SN74LS597N Texas Instruments	SN74LS597 SERIAL-OUT SHIFT REGIS	5728
SN74LS164NSRE4 Texas Instruments	IC SHIFT REGISTER 8BIT 14SO	0
SN74HC594DWR Texas Instruments	IC SHIFT REGISTER 8BIT 16-SOIC	8970
SN74LS597NSR Texas Instruments	PARALLEL IN SERIAL OUT	6000
CD54HC164F Texas Instruments	CD54HC164 HIGH SPEED CMOS LOGIC	74
TPIC6A595DWR Texas Instruments	IC 8-BIT SHIFT REGISTER 24-SOIC	2324
SNJ54195W Texas Instruments	PARALLEL IN PARALLEL OUT	180
SN74HCS596PWR Texas Instruments	GATORADE BD2 COMMERICAL SN74HCS5	4363
SN74F350N Texas Instruments	SHIFTER, F/FAST SERIES	2821

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