# 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. 662-7121 Mfr. Part No.CD74HC4020M96 BrandTexas Instruments Compare \$0.942 Each (In a Pack of 5) units SOIC Counter 14 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. 663-1348 Mfr. Part No.SN74AHCT595PW BrandTexas Instruments Compare \$0.833 Each (In a Pack of 10) units TSSOP Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 162-9176 Mfr. Part No.NLV74HC164ADR2G BrandON Semiconductor Compare \$0.441 Each (On a Reel of 2500) units SOIC Shift Register 8 HC Surface Mount - Up Counter 1 14 2 V 6 V 8.75 x 4 x 1.5mm 8.75mm 4mm New RS Stock No. 922-2896 Mfr. Part No.CD4017BM BrandTexas Instruments Compare \$0.732 Each (In a Tube of 40) 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. 145-1015 Mfr. Part No.CD74HCT4040E BrandTexas Instruments Compare \$0.95 Each (In a Tube of 25) units PDIP Counter 12 HCT Through Hole Binary Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 163-0526 Mfr. Part No.MC14022BDG BrandON Semiconductor Compare \$0.815 Each (In a Tube of 48) units SOIC Counter 4 MC140 Surface Mount Octal - 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 689-8727 Mfr. Part No.MC74HC595ADR2G BrandON Semiconductor Compare \$0.716 Each (In a Pack of 5) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 145-0448 Mfr. Part No.SN74AHCT594PW BrandTexas Instruments Compare \$1.419 Each (In a Tube of 90) units TSSOP Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 178-5186 Mfr. Part No.STPIC6C595TTR BrandSTMicroelectronics Compare \$1.062 Each (On a Reel of 2500) units TSSOP Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1mm 5mm 4.4mm New RS Stock No. 808-0098 Mfr. Part No.MC74HC164ADTR2G BrandON Semiconductor Compare \$0.273 Each (On a Tape of 200) units TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 809-6289 Mfr. Part No.CD74HC4060PW BrandTexas Instruments Compare \$0.794 Each (In a Pack of 10) units TSSOP Counter 14 HC Surface Mount Binary - 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 162-4299 Mfr. Part No.SN74LS595N BrandTexas Instruments Compare \$17.538 Each (In a Tube of 25) units PDIP Shift Register 8 LS Through Hole - Serial to Serial/Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 663-0648 Mfr. Part No.CD74HCT597M BrandTexas Instruments Compare \$1.855 Each (In a Pack of 10) 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. 541-9241 Mfr. Part No.TC74HC4060AF(F) BrandToshiba Compare \$1.478 Each (In a Pack of 5) units SOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10.8 x 5.3 x 1.5mm 10.8mm 5.3mm New RS Stock No. 171-3501 Mfr. Part No.74VHC161FT BrandToshiba Compare \$0.515 Each (In a Pack of 50) 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. 145-0188 Mfr. Part No.TPIC6B596DW BrandTexas Instruments Compare \$2.123 Each (In a Tube of 25) units SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm New RS Stock No. 145-1113 Mfr. Part No.SN74HC163PW BrandTexas Instruments Compare \$0.566 Each (In a Tube of 90) units TSSOP Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 145-0892 Mfr. Part No.SN74HC4040PW BrandTexas Instruments Compare \$0.856 Each (In a Tube of 90) units TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 663-1981 Mfr. Part No.SN74HC165N BrandTexas Instruments Compare \$0.83 Each (In a Pack of 5) 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. 162-5278 Mfr. Part No.SN74HC165QPWRG4Q1 BrandTexas Instruments Compare \$0.29 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
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