# 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. 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. 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. 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. 162-4147 Mfr. Part No.CD74HC4094PWR BrandTexas Instruments Compare MYR1.101 Each (On a Reel of 2000) units TSSOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 662-8534 Mfr. Part No.SN74LV595APWR BrandTexas Instruments Compare MYR3.286 Each (In a Pack of 5) units TSSOP Shift Register 8 LV 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. 168-9619 Mfr. Part No.HEF4017BT,652 BrandNexperia Compare MYR1.744 Each (In a Tube of 50) units SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 709-1971 Mfr. Part No.SN74HC164N BrandTexas Instruments Compare MYR1.958 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. 709-2914 Mfr. Part No.CD74HC597E BrandTexas Instruments Compare MYR5.661 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. 663-0124 Mfr. Part No.CD74HC190E BrandTexas Instruments Compare MYR5.52 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. 483-7890 Mfr. Part No.HEF4017BT,652 BrandNexperia Compare MYR1.777 Each (In a Pack of 20) units SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 662-9543 Mfr. Part No.CD4017BM BrandTexas Instruments Compare MYR1.78 Each (In a Pack of 10) units SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 663-2145 Mfr. Part No.SN74HC590AD BrandTexas Instruments Compare MYR2.86 Each (In a Pack of 5) units SOIC Counter 8 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. 145-0027 Mfr. Part No.CD74HC597E BrandTexas Instruments Compare MYR5.661 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. 178-9163 Mfr. Part No.CD74HCT165M96 BrandTexas Instruments Compare MYR1.243 Each (In a Tube of 40) units SOIC Shift Register 8 HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 145-0867 Mfr. Part No.CD74HC190E BrandTexas Instruments Compare MYR4.70 Each (In a Tube of 25) 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. 922-2830 Mfr. Part No.SN74LV595APWR BrandTexas Instruments Compare MYR1.387 Each (On a Reel of 2000) units TSSOP Shift Register 8 LV 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. 178-9118 Mfr. Part No.TPIC6C596D BrandTexas Instruments Compare MYR6.543 Each (In a Tube of 40) units SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 663-0354 Mfr. Part No.CD74HC4094PW BrandTexas Instruments Compare MYR2.02 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 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 660-4507 Mfr. Part No.TPIC6C596DR BrandTexas Instruments Compare MYR4.46 Each (In a Pack of 5) units SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 662-9575 Mfr. Part No.CD4024BE BrandTexas Instruments Compare MYR2.137 Each (In a Pack of 10) units PDIP Counter, Divider 7 4000 Through Hole Binary Up Counter 1 14 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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