# 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. 709-2012 Mfr. Part No.SN74HC393NE4 BrandTexas Instruments Compare \$0.887 Each (In a Pack of 10) units PDIP Counter, Divider 4 HC Through Hole Binary Up Counter 2 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 169-5707 Mfr. Part No.CD74AC163M BrandTexas Instruments Compare \$0.755 Each (In a Tube of 40) units SOIC Counter 4 AC Surface Mount Binary Up Counter 1 16 1.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 144-9974 Mfr. Part No.SN74HC165PW BrandTexas Instruments Compare \$0.387 Each (In a Tube of 90) units TSSOP Shift Register 8 HC Surface Mount - Parallel to Serial 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 144-9945 Mfr. Part No.CD74HC164E BrandTexas Instruments Compare \$0.496 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 New RS Stock No. 178-4718 Mfr. Part No.MC14040BDG BrandON Semiconductor Compare \$0.667 Each (In a Tube of 48) units SOIC Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 189-2023 Mfr. Part No.HCF4094YM013TR BrandSTMicroelectronics Compare \$0.616 Each (In a Pack of 25) units SO - 8 - Surface Mount - - 1 16 3 V 20 V 10 x 4 x 1.65mm 10mm 4mm New RS Stock No. 662-7121 Mfr. Part No.CD74HC4020M96 BrandTexas Instruments Compare \$0.784 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. 168-2337 Mfr. Part No.BU4094BCF-E2 BrandROHM Compare \$1.319 Each (In a Pack of 10) units SOP Shift Register 8 CMOS Surface Mount - Serial to Serial/Parallel 1 16 3 V 16 V 10 x 4.4 x 1.49mm 10mm 4.4mm New RS Stock No. 145-0188 Mfr. Part No.TPIC6B596DW BrandTexas Instruments Compare \$1.572 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. 662-9540 Mfr. Part No.CD40161BE BrandTexas Instruments Compare \$0.654 Each (In a Pack of 5) units PDIP Counter 4 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 121-9245 Mfr. Part No.CD4029BEE4 BrandTexas Instruments Compare \$0.421 Each (In a Tube of 25) units PDIP Counter 4 4000 Through Hole Binary, Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 709-2453 Mfr. Part No.CD74HC390EE4 BrandTexas Instruments Compare \$0.851 Each (In a Pack of 10) units PDIP Counter, Divider 4 HC Through Hole Decade Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm New RS Stock No. 145-2980 Mfr. Part No.MC14557BDWG BrandON Semiconductor Compare \$1.148 Each (In a Tube of 47) units SOIC W Shift Register 64 CMOS Surface Mount - Serial 1 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm New RS Stock No. 663-1414 Mfr. Part No.SN74ALS164AD BrandTexas Instruments Compare \$2.356 Each (In a Pack of 5) units SOIC Shift Register 8 ALS 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. 145-0030 Mfr. Part No.SN74LS163ANE4 BrandTexas Instruments Compare \$0.576 Each (In a Tube of 25) 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. 145-4025 Mfr. Part No.MC74AC163DR2G BrandON Semiconductor Compare \$0.29 Each (On a Reel of 2500) units SOIC Counter 4 AC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 145-7567 Mfr. Part No.SN74AHC594PWR BrandTexas Instruments Compare \$0.285 Each (On a Reel of 2000) units TSSOP Shift Register 8 AHC Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 186-9050 Mfr. Part No.FS7140-01G-XTD BrandON Semiconductor Compare \$11.00 Each (In a Tube of 48) units SOIC Clock Generator - - Surface Mount - Serial - 16 3 V 3.6 V 10 x 4 x 1.5mm 10mm 4mm New RS Stock No. 709-2996 Mfr. Part No.SN65HVS882PWP BrandTexas Instruments Compare \$8.11 Each units - - - - - - - - - - - - - - New RS Stock No. 152-6494 Mfr. Part No.74HCT595PW-Q100,11 BrandNexperia Compare \$1.133 Each (In a Pack of 10) 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
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