# 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. 145-0893 Mfr. Part No.SN74HC595PW BrandTexas Instruments Compare \$0.853 Each (In a Tube of 90) 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. 165-8511 Mfr. Part No.74LV165PW,112 BrandNexperia Compare \$0.661 Each (In a Tube of 96) units TSSOP Shift Register 8 74LV Surface Mount - Serial/Parallel to Serial 1 16 1 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm New RS Stock No. 186-9842 Mfr. Part No.MC14526BDWG BrandON Semiconductor Compare \$1.368 Each (In a Pack of 10) units SOIC Counter 1 - Surface Mount Divide-By-N Down Counter - 16 3 V dc 18 V dc 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm New RS Stock No. 739-5194 Mfr. Part No.74VHC595MTCX BrandON Semiconductor Compare \$0.732 Each (In a Pack of 5) units TSSOP Shift Register 8 74VHC Surface Mount - Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 0.9mm 5mm 4.4mm New RS Stock No. 171-3532 Mfr. Part No.74VHC164FT BrandToshiba Compare \$0.463 Each (In a Pack of 50) units TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm New RS Stock No. 184-4276 Mfr. Part No.MC74HC165ADTR2G BrandON Semiconductor Compare \$0.156 Each (On a Reel of 2500) units TSSOP Shift Register 8 74HC Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 5.1 x 4.5 x 1.2mm 5.1mm 4.5mm New RS Stock No. 163-0601 Mfr. Part No.MC74HC4094ADR2G BrandON Semiconductor Compare \$0.209 Each (On a Reel of 2500) units SOIC Shift Register 8 MC74 Surface Mount - Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 806-3289 Mfr. Part No.MC14518BDWG BrandON Semiconductor Compare \$1.221 Each (In a Pack of 20) units SOIC W Counter 4 CMOS Surface Mount BCD Up Counter 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm New RS Stock No. 910-1528 Mfr. Part No.MIC5821YN BrandMicrochip Compare \$4.62 Each (In a Pack of 5) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm New RS Stock No. 541-9178 Mfr. Part No.TC74HC4020AF(F) BrandToshiba Compare \$1.488 Each (In a Pack of 5) units SOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V - 10.8mm 5.3mm New RS Stock No. 103-8179 Mfr. Part No.74HC4094D,652 BrandNexperia Compare \$0.831 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. 171-3326 Mfr. Part No.74VHC165FT BrandToshiba Compare \$0.162 Each (On a Reel of 2500) units TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm New RS Stock No. 171-3323 Mfr. Part No.74VHC161FT BrandToshiba Compare \$0.203 Each (On a Reel of 2500) units TSSOP Counter - 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm New RS Stock No. 152-6484 Mfr. Part No.74HCT595PW-Q100,11 BrandNexperia Compare \$0.693 Each (On a Reel of 2500) units TSSOP Shift Register 8 74HCT Surface Mount - Serial to Parallel 1 16 4.5 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm New RS Stock No. 709-2999 Mfr. Part No.SN74LS163AN BrandTexas Instruments Compare \$1.354 Each (In a Pack of 5) units PDIP Counter 4 LS Through Hole Binary Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 637-911 Mfr. Part No.SN74LS592N BrandTexas Instruments Compare \$19.88 Each units PDIP Counter 8 LS Through Hole Binary Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 145-0191 Mfr. Part No.CD4015BE BrandTexas Instruments Compare \$0.798 Each (In a Tube of 25) units PDIP Shift Register 4 4000 Through Hole - Serial to Parallel 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 806-1684 Mfr. Part No.MC74HCT595ADG BrandON Semiconductor Compare \$0.596 Each (In a Pack of 48) units SOIC Shift Register 8 MC74 Surface Mount - Serial/Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 809-9452 Mfr. Part No.SN74AHC595PW BrandTexas Instruments Compare \$0.858 Each (In a Pack of 10) units SOIC Shift Register 8 AHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 144-9945 Mfr. Part No.CD74HC164E BrandTexas Instruments Compare \$0.95 Each (In a Tube of 25) 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
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