# 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. 217-5695 Mfr. Part No.SN74HC595N BrandTexas Instruments Compare PHP28.79 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. 100-0763 Mfr. Part No.SN74HC595N BrandTexas Instruments Compare PHP25.112 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 PHP23.246 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. 732-0691 Mfr. Part No.CD4017BE BrandTexas Instruments Compare PHP27.83 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. 145-0429 Mfr. Part No.CD74HC192E BrandTexas Instruments Compare PHP31.61 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. 663-0130 Mfr. Part No.CD74HC192E BrandTexas Instruments Compare PHP38.33 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. 526-909 Mfr. Part No.TPIC6C595DR BrandTexas Instruments Compare PHP58.374 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. 144-9896 Mfr. Part No.SN74LS393N BrandTexas Instruments Compare PHP54.621 Each (In a Tube of 25) units PDIP Counter, Divider 4 LS Through Hole Binary Up Counter 2 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 178-9117 Mfr. Part No.TPIC6C595D BrandTexas Instruments Compare PHP75.325 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. 304-863 Mfr. Part No.SN74LS393N BrandTexas Instruments Compare PHP63.00 Each units PDIP Counter, Divider 4 LS Through Hole Binary Up Counter 2 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 662-9604 Mfr. Part No.CD4033BE BrandTexas Instruments Compare PHP71.40 Each (In a Pack of 5) units PDIP Counter, Divider 5 4000 Through Hole Decade Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 526-870 Mfr. Part No.TPIC6C595D BrandTexas Instruments Compare PHP67.588 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. 145-1056 Mfr. Part No.CD4033BE BrandTexas Instruments Compare PHP62.118 Each (In a Tube of 25) units PDIP Counter, Divider 5 4000 Through Hole Decade Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 483-6651 Mfr. Part No.74HC595PW,112 BrandNexperia Compare PHP14.39 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. 660-7994 Mfr. Part No.TPIC6A596NE BrandTexas Instruments Compare PHP215.78 Each units PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.51 x 6.86 x 4.57mm 24.51mm 6.86mm New RS Stock No. 355-8934 Mfr. Part No.HEF4060BT,652 BrandNexperia Compare PHP27.85 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. 144-9996 Mfr. Part No.CD4518BE BrandTexas Instruments Compare PHP17.556 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 PHP24.531 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. 162-4293 Mfr. Part No.SN74LS164N BrandTexas Instruments Compare PHP28.172 Each (In a Tube of 25) units PDIP Shift Register 8 LS Through Hole - Serial to Parallel 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 305-018 Mfr. Part No.SN74LS164N BrandTexas Instruments Compare PHP33.74 Each units PDIP Shift Register 8 LS Through Hole - Serial to Parallel 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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