# Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
 New RS Stock No. 178-7561 Mfr. Part No.MC74HC595ADTR2G BrandON Semiconductor Compare SGD0.149 Each (On a Reel of 2500) units TSSOP Shift Register 8 CMOS Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 791-8753 Mfr. Part No.74HC595BQ,115 BrandNexperia Compare SGD0.431 Each (In a Pack of 50) units VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm New RS Stock No. 709-2914 Mfr. Part No.CD74HC597E BrandTexas Instruments Compare SGD2.132 Each (In a Pack of 10) units PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 145-0003 Mfr. Part No.CD4516BE BrandTexas Instruments Compare SGD0.734 Each (In a Tube of 25) units PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 709-1971 Mfr. Part No.SN74HC164N BrandTexas Instruments Compare SGD0.738 Each (In a Pack of 5) units PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 910-1528 Mfr. Part No.MIC5821YN BrandMicrochip Compare SGD4.08 Each (In a Pack of 5) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm New RS Stock No. 355-8934 Mfr. Part No.HEF4060BT,652 BrandNexperia Compare SGD0.74 Each units SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 145-0027 Mfr. Part No.CD74HC597E BrandTexas Instruments Compare SGD2.132 Each (In a Tube of 25) units PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 922-2943 Mfr. Part No.SN74LS90N BrandTexas Instruments Compare SGD0.795 Each (In a Tube of 25) units PDIP Counter, Divider 4 LS Through Hole Decade Up Counter 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 663-0124 Mfr. Part No.CD74HC190E BrandTexas Instruments Compare SGD2.03 Each (In a Pack of 5) units PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 663-0379 Mfr. Part No.CD74HC4518E BrandTexas Instruments Compare SGD2.856 Each (In a Pack of 5) units PDIP Counter 4 HC Through Hole BCD Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 124-2264 Mfr. Part No.74HC595D,112 BrandNexperia Compare SGD0.468 Each (In a Tube of 50) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 145-9134 Mfr. Part No.MIC5821YN BrandMicrochip Compare SGD3.396 Each (In a Tube of 25) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm New RS Stock No. 688-1537 Mfr. Part No.MC14094BDTR2G BrandON Semiconductor Compare SGD0.77 Each (In a Pack of 5) units TSSOP Shift Register 8 4000 Surface Mount - Up Counter 1 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 806-3289 Mfr. Part No.MC14518BDWG BrandON Semiconductor Compare SGD1.10 Each (In a Pack of 20) units SOIC W Counter 4 CMOS Surface Mount BCD Up Counter 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm New RS Stock No. 689-8727 Mfr. Part No.MC74HC595ADR2G BrandON Semiconductor Compare SGD0.646 Each (In a Pack of 5) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 663-2782 Mfr. Part No.SN74LV8154PW BrandTexas Instruments Compare SGD1.908 Each (In a Pack of 5) units TSSOP Counter 8 LV Surface Mount Binary Up Counter 2 20 2 V 5.5 V 6.5 x 4.4 x 1.15mm 6.5mm 4.4mm New RS Stock No. 145-0873 Mfr. Part No.CD74HC4518E BrandTexas Instruments Compare SGD2.28 Each (In a Tube of 25) units PDIP Counter 4 HC Through Hole BCD Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 634-619 Mfr. Part No.CD74HCT193E BrandTexas Instruments Compare SGD1.34 Each units PDIP Counter 4 HCT Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 709-2122 Mfr. Part No.CD4516BE BrandTexas Instruments Compare SGD0.734 Each (In a Pack of 10) units PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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