# 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. 802-1418 Mfr. Part No.74VHC595M BrandON Semiconductor Compare HK\$4.209 Each (In a Tube of 48) units SOIC Shift Register 9 VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 9.9 x 3.9 x 1.45mm 9.9mm 3.9mm New RS Stock No. 739-0136 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare HK\$4.712 Each (In a Pack of 5) units SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 483-6667 Mfr. Part No.74HC597D,652 BrandNexperia Compare HK\$3.904 Each (In a Pack of 10) 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. 166-2453 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare HK\$1.549 Each (On a Reel of 2500) units SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 483-6516 Mfr. Part No.74HC40103D,652 BrandNexperia Compare HK\$8.456 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. 732-0691 Mfr. Part No.CD4017BE BrandTexas Instruments Compare HK\$4.584 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. 165-4195 Mfr. Part No.MIC5841YN BrandMicrochip Compare HK\$32.702 Each (In a Tube of 21) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 18 - - 23.37 x 6.35 x 3.3mm 23.37mm 6.35mm New RS Stock No. 921-5166 Mfr. Part No.CD4017BE BrandTexas Instruments Compare HK\$3.698 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. 170-7956 Mfr. Part No.74HC595D,118 BrandNexperia Compare HK\$0.699 Each (On a Reel of 2500) units SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 483-7963 Mfr. Part No.HEF4520BT,652 BrandNexperia Compare HK\$3.905 Each (In a Pack of 20) units SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 910-1519 Mfr. Part No.MIC5841YN BrandMicrochip Compare HK\$32.28 Each (In a Pack of 2) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 18 - - 23.37 x 6.35 x 3.3mm 23.37mm 6.35mm New RS Stock No. 145-0892 Mfr. Part No.SN74HC4040PW BrandTexas Instruments Compare HK\$4.142 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. 178-9203 Mfr. Part No.SN74HC4040D BrandTexas Instruments Compare HK\$4.19 Each (In a Tube of 40) 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. 663-2105 Mfr. Part No.SN74HC4040PW BrandTexas Instruments Compare HK\$4.36 Each (In a Pack of 10) 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. 663-0288 Mfr. Part No.CD74HC393M BrandTexas Instruments Compare HK\$4.969 Each (In a Pack of 10) units SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm New RS Stock No. 166-1285 Mfr. Part No.HEF4520BT,652 BrandNexperia Compare HK\$4.11 Each (In a Tube of 50) units SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 178-6973 Mfr. Part No.74HC40103D,652 BrandNexperia Compare HK\$6.622 Each (In a Tube of 50) 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. 663-2101 Mfr. Part No.SN74HC4040D BrandTexas Instruments Compare HK\$4.19 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. 436-7638 Mfr. Part No.74HC595D,112 BrandNexperia Compare HK\$2.07 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. 145-5786 Mfr. Part No.CD74HC393M BrandTexas Instruments Compare HK\$4.969 Each (In a Tube of 50) units SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
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