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. 144-9996 Mfr. Part No.CD4518BE BrandTexas Instruments Compare SGD0.646 Each (In a Tube of 25) units PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 709-2025 Mfr. Part No.CD4518BE BrandTexas Instruments Compare SGD0.646 Each (In a Pack of 10) units PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 170-7956 Mfr. Part No.74HC595D,118 BrandNexperia Compare SGD0.121 Each (On a Reel of 2500) units SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 436-7638 Mfr. Part No.74HC595D,112 BrandNexperia Compare SGD0.352 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. 177-6708 Mfr. Part No.74HC4060D,652 BrandNexperia Compare SGD0.42 Each units SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 178-6969 Mfr. Part No.74HC4060D,652 BrandNexperia Compare SGD0.36 Each (In a Tube of 50) units SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 310-650 Mfr. Part No.TPIC6595N BrandTexas Instruments Compare SGD5.58 Each units PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm New RS Stock No. 162-4390 Mfr. Part No.TPIC6595N BrandTexas Instruments Compare SGD5.08 Each (In a Tube of 20) units PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm New RS Stock No. 145-7567 Mfr. Part No.SN74AHC594PWR BrandTexas Instruments Compare SGD0.266 Each (On a Reel of 2000) units TSSOP Shift Register 8 AHC Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 662-9717 Mfr. Part No.CD4520BE BrandTexas Instruments Compare SGD0.814 Each (In a Pack of 5) units PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 527-388 Mfr. Part No.SN74HC165D BrandTexas Instruments Compare SGD0.626 Each (In a Pack of 20) 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. 662-9562 Mfr. Part No.CD4020BE BrandTexas Instruments Compare SGD0.56 Each (In a Pack of 5) units PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 145-0854 Mfr. Part No.CD4020BE BrandTexas Instruments Compare SGD0.606 Each (In a Tube of 25) units PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 145-0070 Mfr. Part No.SN74HC165D BrandTexas Instruments Compare SGD0.626 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. 526-640 Mfr. Part No.SN74HC165DR BrandTexas Instruments Compare SGD0.437 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. 144-9939 Mfr. Part No.CD4520BE BrandTexas Instruments Compare SGD0.646 Each (In a Tube of 25) units PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 121-9068 Mfr. Part No.TPIC6B596N BrandTexas Instruments Compare SGD2.14 Each (In a Tube of 20) units PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm New RS Stock No. 921-5166 Mfr. Part No.CD4017BE BrandTexas Instruments Compare SGD0.622 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. 178-4723 Mfr. Part No.MC14094BDG BrandON Semiconductor Compare SGD0.524 Each (In a Tube of 48) units SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 145-0173 Mfr. Part No.SN74HC393D BrandTexas Instruments Compare SGD0.649 Each (In a Tube of 50) units SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
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