Logic - Shift Registers

Part Number	Description / PDF	Quantity
SN74HC166DR Texas Instruments	IC 8BIT SERIAL SHIFT REG 16-SOIC	5850
74HC165DB,118 NXP Semiconductors	PARALLEL IN SERIAL OUT, HC/UH SE	12432
CD74HC595DWR Texas Instruments	CD74HC595 8-BIT SHIFT REGISTERS	21107
MC74HC165AFG	PARALLEL IN SERIAL OUT	0
CD74FCT16823ATMT	FAST CMOS 18-BIT REGISTER	2940
SN74HC166DRG4 Texas Instruments	IC SHIFT REGISTER SGL 8B 16SOIC	4559
74HCT165N,652 NXP Semiconductors	PARALLEL IN SERIAL OUT	15608
SN74HC595DE4 Texas Instruments	IC SHIFT REGISTER 8BIT 16-SOIC	0
SN74LS165MR1	PARALLEL IN SERIAL OUT, 8-BIT	7000
DM54LS323J/883	SHIFT REGISTER, 8-BIT	57
54164FMQB	SERIAL IN PARALLEL OUT	186
CD74HC164ME4 Texas Instruments	IC SHIFT REGISTER 8BIT HS 14SOIC	0
CD4031BPWR Texas Instruments	IC SHFT REG STAT 64STG 16-TSSOP	2000
SN74LV166AD Texas Instruments	IC REGISTR PAR-LOAD 8BIT 16-SOIC	169
CD54HCT166F3A Texas Instruments	CD54HCT166 HIGH SPEED CMOS LOGIC	327
HV5222PJ-G Roving Networks / Microchip Technology	IC 32BIT SRL PARALLEL 220V 44PLC	71
SNJ54S195W Texas Instruments	PARALLEL IN PARALLEL OUT	93
MC14559BDWR2G	SUCCESSIVE APROX REGISTER, PDSO1	6101
4021BDMQB	SHIFT REGISTER, 8-BIT	18331
SN74LV594ADR Texas Instruments	IC 8-BIT SHFT REG W/OUT 16-SOIC	1873

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