# 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. 144-9930 Mfr. Part No.CD4021BEE4 BrandTexas Instruments Compare kr 3,366 Each (In a Tube of 25) Units PDIP Shift Register 8 4000 Through Hole - Serial/Parallel to Serial 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 662-9565 Mfr. Part No.CD4021BEE4 BrandTexas Instruments Compare kr 4,766 Each (In a Pack of 5) Units PDIP Shift Register 8 4000 Through Hole - Serial/Parallel to Serial 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 791-8737 Mfr. Part No.74HC393D,652 BrandNexperia Compare kr 3,002 Each (In a Pack of 19) Units SOIC Counter 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm New RS Stock No. 217-5695 Mfr. Part No.SN74HC595N BrandTexas Instruments Compare kr 5,18 Each Units PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 166-2453 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare kr 1,53 Each (On a Reel of 2500) Units SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 739-0136 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare kr 4,886 Each (In a Pack of 5) Units SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 100-0763 Mfr. Part No.SN74HC595N BrandTexas Instruments Compare kr 3,912 Each (In a Tube of 25) Units PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 921-5166 Mfr. Part No.CD4017BE BrandTexas Instruments Compare kr 3,613 Each (In a Tube of 25) Units PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm New RS Stock No. 527-520 Mfr. Part No.SN74HC595DR BrandTexas Instruments Compare kr 3,562 Each (In a Pack of 25) Units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 709-2069 Mfr. Part No.SN74HC4040N BrandTexas Instruments Compare kr 4,616 Each (In a Pack of 10) Units PDIP Counter 12 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 732-0691 Mfr. Part No.CD4017BE BrandTexas Instruments Compare kr 4,466 Each (In a Pack of 5) Units PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm New RS Stock No. 145-0001 Mfr. Part No.SN74HC4040N BrandTexas Instruments Compare kr 3,856 Each (In a Tube of 25) Units PDIP Counter 12 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 162-6950 Mfr. Part No.CD74HC4040M96 BrandTexas Instruments Compare kr 1,862 Each (On a Reel of 2500) Units SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 121-8427 Mfr. Part No.SN74HC595DR BrandTexas Instruments Compare kr 1,284 Each (On a Reel of 2500) Units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 526-757 Mfr. Part No.SN74HC595D BrandTexas Instruments Compare kr 3,956 Each (In a Tube of 40) Units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 663-0326 Mfr. Part No.CD74HC4020M BrandTexas Instruments Compare kr 1,738 Each (In a Pack of 5) Units SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 662-7125 Mfr. Part No.CD74HC4040M96 BrandTexas Instruments Compare kr 2,024 Each (In a Pack of 5) Units SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 808-0114 Mfr. Part No.MC74HC589ADTR2G BrandON Semiconductor Compare kr 1,744 Each (On a Tape of 100) Units TSSOP Shift Register 8 HC Surface Mount - Parallel to Serial, Serial 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 663-1966 Mfr. Part No.SN74HC163D BrandTexas Instruments Compare kr 2,791 Each (In a Pack of 10) Units SOIC Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 163-0605 Mfr. Part No.MC74HC589ADTR2G BrandON Semiconductor Compare kr 1,112 Each (On a Reel of 2500) Units TSSOP Shift Register 8 HC Surface Mount - Parallel to Serial, Serial 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
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