# 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. 304-986 Mfr. Part No.SN74LS194AN BrandTexas Instruments Compare \$2.18 Each units PDIP Shift Register 4 LS Through Hole - Serial/Parallel to 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. 806-3131 Mfr. Part No.MC14017BDG BrandON Semiconductor Compare \$0.724 Each (In a Pack of 25) units SOIC Counter 5 CMOS Surface Mount Decade Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 162-7552 Mfr. Part No.TPIC6C596PWR BrandTexas Instruments Compare \$1.438 Each (On a Reel of 2000) units TSSOP Shift Register 8 - 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. 663-0521 Mfr. Part No.CD74HCT166M BrandTexas Instruments Compare \$0.464 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. 145-5722 Mfr. Part No.CD74ACT161M BrandTexas Instruments Compare \$0.59 Each (In a Tube of 40) units SOIC Counter 4 ACT Surface Mount Binary Up Counter 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 663-1978 Mfr. Part No.SN74HC164PW BrandTexas Instruments Compare \$0.401 Each (In a Pack of 10) units TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 186-9019 Mfr. Part No.74VHC595MX BrandON Semiconductor Compare \$0.448 Each (On a Reel of 2500) units SOIC Shift Register - VHC Surface Mount - Serial to Parallel 1 16 2 V +5.5 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 186-9089 Mfr. Part No.MC74HC393ADG BrandON Semiconductor Compare \$0.70 Each (In a Tube of 55) units SOIC Counter - HC Surface Mount Binary - - 14 2 V dc 6 V dc 8.75 x 4 x 1.5mm 8.75mm 4mm New RS Stock No. 162-7249 Mfr. Part No.CD74HCT164M BrandTexas Instruments Compare \$0.337 Each (In a Tube of 50) units SOIC Shift Register 8 HCT Surface Mount - Serial to Parallel 1 14 4.5 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm New RS Stock No. 518-8830 Mfr. Part No.MC14024BDG BrandON Semiconductor Compare \$0.62 Each units SOIC Counter, Divider 7 4000 Surface Mount Binary Up Counter 1 14 3 V 18 V 8.75 x 4 x 1.5mm 8.75mm 4mm New RS Stock No. 177-6607 Mfr. Part No.74HC164D,652 BrandNexperia Compare \$0.86 Each units SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm New RS Stock No. 663-0288 Mfr. Part No.CD74HC393M BrandTexas Instruments Compare \$0.782 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. 663-0121 Mfr. Part No.CD74HC191M BrandTexas Instruments Compare \$0.698 Each (In a Pack of 5) units SOIC Counter 4 HC Surface Mount Binary Down Counter, Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 663-2782 Mfr. Part No.SN74LV8154PW BrandTexas Instruments Compare \$1.84 Each (In a Pack of 5) units TSSOP Counter 8 LV Surface Mount Binary Up Counter 2 20 2 V 5.5 V 6.5 x 4.4 x 1.15mm 6.5mm 4.4mm New RS Stock No. 145-6057 Mfr. Part No.CD4026BPW BrandTexas Instruments Compare \$0.317 Each (In a Tube of 90) units TSSOP Counter 5 4000 Surface Mount Decade - 1 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm New RS Stock No. 922-2965 Mfr. Part No.TPIC6A596DW BrandTexas Instruments Compare \$3.924 Each (In a Tube of 25) units SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 24 4.5 V 5.5 V 15.4 x 7.52 x 2.35mm 15.4mm 7.52mm New RS Stock No. 144-9973 Mfr. Part No.SN74HC164PW BrandTexas Instruments Compare \$0.207 Each (In a Tube of 90) units TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 144-9944 Mfr. Part No.CD74HC165E BrandTexas Instruments Compare \$0.411 Each (In a Tube of 25) 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. 146-0848 Mfr. Part No.74HCT594D,652 BrandNexperia Compare \$1.176 Each (In a Tube of 50) units SOIC Shift Register 8 74HCT Surface Mount - Serial to Parallel 1 16 4.5 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 186-9612 Mfr. Part No.MC74HCT595ADR2G BrandON Semiconductor Compare \$0.546 Each (In a Pack of 25) units SOIC Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 10 x 4 x 1.5mm 10mm 4mm
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