Logic - Shift Registers

Part Number	Description / PDF	Quantity
AM29824DC	BUS INTERFACE REGISTERS	6061
74HC4094D-Q100118 NXP Semiconductors	SERIAL IN PARALLEL OUT	0
CD4021BCN	PARALLEL IN SERIAL OUT	15858
MM74HCT164M Sanyo Semiconductor/ON Semiconductor	IC SHIFT REG 8BIT SIPO 14-SOIC	103671500
74HCT670N,652 NXP Semiconductors	STANDARD SRAM, 4X4	1026
SN74LV8153PWR Texas Instruments	IC SERIAL-PARALLEL INTRF 20TSSOP	1931
MC14021BDR2	PARALLEL IN SERIAL OUT	13994
CD74HC194E Texas Instruments	IC BI-DIR SHIFT REGISTER 16-DIP	3168
CD74HC195PWG4 Texas Instruments	IC 4-BIT ACCESS REGISTER 16TSSOP	0
74HCT595BQ Nexperia	SERIAL IN PARALLEL OUT, HCT SERI	0
SN74LV164APWT Texas Instruments	IC REGISTER PAR-OUT 8BIT 14TSSOP	1226
CD74HC194PWT Texas Instruments	IC BI-DIR SHIFT REGISTER 16TSSOP	1000
SN74LV165ADBR Texas Instruments	IC REGISTR PAR-LOAD 8BIT 16SSOP	2000
CD74HC4094M96G4 Texas Instruments	IC 8STG SHFT/STOR BUS REG 16SOIC	0
74HCT164S14-13 Zetex Semiconductors (Diodes Inc.)	IC 8BIT SERIAL SHIFT REG 14-SOIC	2468
SN74HC165DRG3 Texas Instruments	IC SHIFT REGISTER 8BIT 16SOIC	1231
BU4015BF-E2 ROHM Semiconductor	IC SHIFT REGISTER DL 4BIT 16SOP	0
QS74FCT299ATP	PARALLEL IN PARALLEL OUT	2727
QS74FCT2273ATZ	QUALITY SEMI FPGA 7680-CELL	1487
NPIC6C595BQ-Q100,1 Nexperia	IC SHIFT REGISTER 8BIT 16DHVQFN	5834

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