Logic - Shift Registers

Part Number	Description / PDF	Quantity
74VHC595MX Sanyo Semiconductor/ON Semiconductor	IC SHIFT REGISTER 8BIT 16-SOIC	1183
8302101RA Texas Instruments	SN54ALS299 8-BIT UNIVERSAL SHIFT	20
SN74LV595APWRG3 Texas Instruments	IC SHIFT REGISTR 8B 3ST 16TSSOP	2122
74HC4094D,652 Nexperia	IC REGISTER BUS 8STAGE 16SOIC	1095
74HC595DB,118 Nexperia	IC 8BIT SHIFT REGISTER 16SSOP	4466
CD4035BE	PARALLEL IN PARALLEL OUT	74928
CD4014BE Texas Instruments	IC STATIC SHFT REG 8STG 16-DIP	787
74VHCT595D,118 Nexperia	IC SHIFT REG 8BIT SISO 16SOIC	1280
SN74LS597D Texas Instruments	SN74LS597 SERIAL-OUT SHIFT REGIS	15167
CD74HCT670M Texas Instruments	CD74HCT670 HIGH SPEED CMOS LOGIC	10635
HEF4094BT,653 Nexperia	IC REGISTER BUS 8STAGE 16SOIC	9502
SN54LS165AJ Texas Instruments	54LS165A PARALLEL-LOAD 8-BIT SHI	0
SN74LS164N Texas Instruments	IC 8-BIT SHIFT REGISTER 14-DIP	1533
CD74FCT162823ATMT	FAST CMOS 18-BIT REGISTER	141
SN74HCS16507DR Texas Instruments	8-BIT PARALLEL-LOAD SHIFT REGIST	2500
74HC670N,652 NXP Semiconductors	STANDARD SRAM, 4X4	2208
54LS195DM	SHIFT REGISTER, 4 BIT, TTL, CDIP	1405
74HCT165D-Q100,118 Nexperia	PARALLEL IN SERIAL OUT, HCT SERI	29900
SN74LV165ARGYRG4 Texas Instruments	IC SHFT REG PARAL LD 8BIT 16VQFN	0
HEF4015BT,652 Nexperia	IC REGISTER STATIC 4BIT 16-SOIC	864

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