# 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. 663-2101 Mfr. Part No.SN74HC4040D BrandTexas Instruments Compare \$0.866 Each (In a Pack of 10) units SOIC Counter 12 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. 781-2822 Mfr. Part No.74HC4017D,652 BrandNexperia Compare \$0.88 Each (In a Pack of 25) units SOIC Counter 10 74HC Surface Mount Decade Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 662-6850 Mfr. Part No.CD4060BPWR BrandTexas Instruments Compare \$0.633 Each (In a Pack of 10) units TSSOP Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 146-0374 Mfr. Part No.74HC4017D,652 BrandNexperia Compare \$0.88 Each (In a Tube of 50) units SOIC Counter 10 74HC Surface Mount Decade Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 483-6516 Mfr. Part No.74HC40103D,652 BrandNexperia Compare \$1.782 Each (In a Pack of 5) units SOIC Counter 8 HC Surface Mount Binary Down Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 527-388 Mfr. Part No.SN74HC165D BrandTexas Instruments Compare \$0.748 Each (In a Pack of 20) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 145-6875 Mfr. Part No.CD4059AM BrandTexas Instruments Compare \$4.554 Each (In a Tube of 25) units SOIC Counter, Divider 5 4000 Surface Mount Divide-By-N Down Counter 1 24 3 V 12 V 15.4 x 7.52 x 2.35mm 15.4mm 7.52mm New RS Stock No. 162-7393 Mfr. Part No.SN74HC4060DR BrandTexas Instruments Compare \$0.347 Each (On a Reel of 2500) 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. 528-202 Mfr. Part No.SN74HC4020D BrandTexas Instruments Compare \$0.877 Each (In a Pack of 20) 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. 368-7183 Mfr. Part No.HEF4020BT,652 BrandNexperia Compare \$1.06 Each (In a Tube of 50) 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. 526-870 Mfr. Part No.TPIC6C595D BrandTexas Instruments Compare \$2.402 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. 662-9657 Mfr. Part No.CD4059AM BrandTexas Instruments Compare \$5.08 Each units SOIC Counter, Divider 5 4000 Surface Mount Divide-By-N Down Counter 1 24 3 V 12 V 15.4 x 7.52 x 2.35mm 15.4mm 7.52mm New RS Stock No. 145-0474 Mfr. Part No.SN74HC590AN BrandTexas Instruments Compare \$0.688 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. 662-8219 Mfr. Part No.SN74HC4020DR BrandTexas Instruments Compare \$0.851 Each (In a Pack of 10) 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. 526-353 Mfr. Part No.SN74HC4060D BrandTexas Instruments Compare \$0.898 Each (In a Pack of 20) 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. 145-6607 Mfr. Part No.CD4060BM BrandTexas Instruments Compare \$0.732 Each (In a Tube of 40) units SOIC Counter 14 CD4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.5mm - - New RS Stock No. 178-9109 Mfr. Part No.SN74HC4060D BrandTexas Instruments Compare \$0.898 Each (In a Tube of 40) 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. 816-4688 Mfr. Part No.74HCT4020D,652 BrandNexperia Compare \$0.958 Each (In a Pack of 25) units SOIC Counter 14 74HCT Surface Mount Binary Up Counter 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 796-7947 Mfr. Part No.CD4060BM BrandTexas Instruments Compare \$0.856 Each (In a Pack of 10) units SOIC Counter 14 CD4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.5mm - - New RS Stock No. 162-7392 Mfr. Part No.SN74HC4020DR BrandTexas Instruments Compare \$0.341 Each (On a Reel of 2500) 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
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