Logic - Shift Registers

Part Number	Description / PDF	Quantity
JM38510/30601BFA Texas Instruments	54LS194A 4-BIT BIDIRECTIONAL UNI	912
SN74LV165AD Texas Instruments	IC 8BIT PAR LOAD SHFT REG 16SOIC	1473
SN74LV165APWRE4 Texas Instruments	IC REGISTR PAR-LOAD 8BIT 16TSSOP	0
78024012A Texas Instruments	SN54LS299 8-BIT UNIVERSAL SHIFT/	26
SN74ALS165DR Texas Instruments	IC SHIFT REG 8BIT PARALL 16-SOIC	1415
CD74HCT166M96 Texas Instruments	IC SHIFT REGISTER PAR/SER 16SOIC	1430
SN74LV164ADBR Texas Instruments	IC 8-BIT SER SHIFT REG 14-SSOP	5887
TPIC6C595D Texas Instruments	TPIC6C595 8-BIT SHIFT REGISTER	20633
SN74LS672N Texas Instruments	PARALLEL IN PARALLEL OUT	2800
CD74AC299M96 Texas Instruments	IC 8BIT SHIFT/STOR REGSTR 20SOIC	1977
CD74HC166M Texas Instruments	IC SHIFT REGISTER 8BIT HS 16SOIC	1270
SN74HC165QPWRQ1 Texas Instruments	IC SHIFT REGISTER 8BIT 16-TSSOP	5087
CD74HC597M96 Texas Instruments	IC SHIFT REGISTER 8-BIT 16SOIC	3476
SN74AHCT595D Texas Instruments	IC 8-BIT SHIFT REGISTER 16-SOIC	932
SN74HC164APW Texas Instruments	SHIFT REGISTER SINGLE	12600
CD4517BF3A Texas Instruments	CD4517B-MIL CMOS DUAL 64-STAGE S	28
TPIC6595DWR Texas Instruments	IC PWR 8-BIT SHIFT REGIS 20-SOIC	1828
SN74LV165ARGYR Texas Instruments	IC SHFT REG PARAL LD 8BIT 16VQFN	8407
CD74HC195PWR Texas Instruments	CD74HC195 HIGH SPEED CMOS LOGIC	15844
SN74HC594D Texas Instruments	IC 8-BIT SHIFT REGISTER 16-SOIC	1610

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