Logic - Shift Registers

Part Number	Description / PDF	Quantity
MM74HC165SJX	PARALLEL IN SERIAL OUT	19335
HEF4014BT-Q100118 NXP Semiconductors	PARALLEL IN SERIAL OUT, 8-BIT	2500
MC14015BFL1	SHIFT REGISTER, 4-BIT	1000
JM38510/07601BEA Texas Instruments	SN54S194 4-BIT BIDIRECTIONAL UNI	9
74LS299PC	SHIFT REGISTER, 8 BIT, TTL, PDIP	22267
TPIC6A596DWG4 Texas Instruments	TPIC6A596 8-BIT SHIFT REGISTER	375
SN74HCS596DR Texas Instruments	8-BIT SERIAL-IN/PARALLEL-OUT SHI	2455
CD74ACT164EX	8-BIT SHIFT REGISTER	501
SN74AS95AD Texas Instruments	SHIFT REGISTER, 4-BIT, TTL	873
74HC595DB-Q100J Nexperia	IC COUNTER REGISTER 8BIT 16SSOP	0
CD74FCT16823ATSM	FAST CMOS 18-BIT REGISTER	1000
SN74HCS164QPWRQ1 Texas Instruments	AUTOMOTIVE 8-BIT SERIAL-IN/PARAL	10259
74HC4015D,652 NXP Semiconductors	SERIAL IN PARALLEL OUT	2808
SN74LS674N Texas Instruments	PARALLEL IN SERIAL OUT	132
74HC594PW-Q100J Nexperia	74HC594PW-Q100/SOT403/TSSOP16	406
74LV595N,112 NXP Semiconductors	SERIAL IN PARALLEL OUT	870
SN74HC595DWR Texas Instruments	IC 8BIT SHIFT REG 3ST-OUT 16SOIC	5100
74HC166DB118 Nexperia	NOW NEXPERIA 74HC166DB - PARALLE	0
93L38PC	REGISTER FILE	772
CD4021BE Texas Instruments	IC STATIC SHFT REG 8STG 16-DIP	5008

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