Logic - Shift Registers

Part Number	Description / PDF	Quantity
SN74LS166AN Texas Instruments	IC SERIAL-OUT SHIFTER 16-DIP	201
COM82C501CD Fluke Electronics	ETHERNET SERIAL INTERFACE	52
SNJ54164W Texas Instruments	SERIAL IN PARALLEL OUT	13
74HC594N,112 NXP Semiconductors	SERIAL IN PARALLEL OUT	275
SN74LV166ADBR Texas Instruments	SN74LV166A 8-BIT PARALLEL-LOAD S	6000
SN74ALS165N Texas Instruments	IC SHIFT REG 8BIT PARALL 16-DIP	63
CD74HC165M96 Texas Instruments	IC SHIFT REGISTER 8BIT HS 16SOIC	2608
74LS323PC	SHIFT REGISTER, 8-BIT, TTL	9709
74VHC595FT Toshiba Electronic Devices and Storage Corporation	IC REGISTER SHIFT 8-BIT 16TSSOP	0
SNJ54HC166J Texas Instruments	54HC166 PARALLEL-LOAD 8-BIT SHIF	71
MC74HC194N	PARALLEL IN PARALLEL OUT	3672
CY29FCT520ATSOCT Texas Instruments	PIPELINE REGISTER, 8-BIT, CMOS	19000
54LS195ADM	SHIFT REGISTER, 4-BIT	179
74HC597D,652 Nexperia	IC SHIFT REGISTER 8BIT 16SOIC	422
TPIC6C596N Texas Instruments	IC 8 BIT SHIFT REGISTER 16-DIP	796
TPIC6B596DW Texas Instruments	IC 8-BIT SHIFT REGISTER 20-SOIC	177
MC74HC4094ADTG Sanyo Semiconductor/ON Semiconductor	IC REGISTER SHIFT/STORE 16TSSOP	0
CD74HCT165M96 Texas Instruments	IC 8BIT SHIFT REGISTER HS 16SOIC	4985
MM54HC195J/883	SHIFT REGISTER, 4-BIT	75
TMC2111AN2C	PIPELINE REGISTER, 8-BIT	1694

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