# 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. 662-9569 Mfr. Part No.CD4021BM BrandTexas Instruments Compare MYR1.70 Each (In a Pack of 10) units SOIC Shift Register 8 4000 Surface Mount - Serial/Parallel to Serial 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 922-2943 Mfr. Part No.SN74LS90N BrandTexas Instruments Compare MYR2.101 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. 662-7092 Mfr. Part No.CD74HC299M96 BrandTexas Instruments Compare MYR3.52 Each (In a Pack of 5) units SOIC Shift Register 8 HC Surface Mount - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm New RS Stock No. 145-0855 Mfr. Part No.CD4021BM BrandTexas Instruments Compare MYR1.70 Each (In a Tube of 40) units SOIC Shift Register 8 4000 Surface Mount - Serial/Parallel to Serial 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 806-3191 Mfr. Part No.MC14060BDR2G BrandON Semiconductor Compare MYR1.45 Each (In a Pack of 25) units SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 145-7566 Mfr. Part No.CD74HC299M96 BrandTexas Instruments Compare MYR1.408 Each (On a Reel of 2000) units SOIC Shift Register 8 HC Surface Mount - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm New RS Stock No. 145-1258 Mfr. Part No.CD74HC299EE4 BrandTexas Instruments Compare MYR3.114 Each (In a Tube of 20) units PDIP Shift Register 8 HC Through Hole - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm New RS Stock No. 170-3420 Mfr. Part No.MC14094BDR2G BrandON Semiconductor Compare MYR0.524 Each (On a Reel of 2500) 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. 163-0544 Mfr. Part No.MC14516BDG BrandON Semiconductor Compare MYR2.805 Each (In a Tube of 48) units SOIC Counter 4 CMOS Surface Mount Binary Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 732-0691 Mfr. Part No.CD4017BE BrandTexas Instruments Compare MYR2.17 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. 921-5166 Mfr. Part No.CD4017BE BrandTexas Instruments Compare MYR1.78 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. 145-0474 Mfr. Part No.SN74HC590AN BrandTexas Instruments Compare MYR1.968 Each (In a Tube of 25) units PDIP Counter 8 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. 518-9215 Mfr. Part No.MC14094BDG BrandON Semiconductor Compare MYR1.88 Each 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. 518-9035 Mfr. Part No.MC14060BDG BrandON Semiconductor Compare MYR2.21 Each units SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 483-6651 Mfr. Part No.74HC595PW,112 BrandNexperia Compare MYR1.12 Each (In a Pack of 10) units TSSOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm New RS Stock No. 709-2539 Mfr. Part No.CD74HC299EE4 BrandTexas Instruments Compare MYR4.816 Each (In a Pack of 5) units PDIP Shift Register 8 HC Through Hole - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm New RS Stock No. 688-1533 Mfr. Part No.MC14094BDR2G BrandON Semiconductor Compare MYR1.96 Each (In a Pack of 5) 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. 709-2523 Mfr. Part No.SN74HC590AN BrandTexas Instruments Compare MYR2.724 Each (In a Pack of 5) units PDIP Counter 8 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. 809-5905 Mfr. Part No.SN74LS670D BrandTexas Instruments Compare MYR11.364 Each (In a Pack of 5) units SOIC Register 4 LS Surface Mount - - 1 16 4.75 V 5.25 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 663-2622 Mfr. Part No.SN74LS90N BrandTexas Instruments Compare MYR2.51 Each (In a Pack of 5) 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
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