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
RS Stock No. 178-7561
Mfr. Part No.MC74HC595ADTR2G
SGD0.149
Each (On a Reel of 2500)
units
TSSOP Shift Register 8 CMOS Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 791-8753
Mfr. Part No.74HC595BQ,115
BrandNexperia
SGD0.431
Each (In a Pack of 50)
units
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 709-2914
Mfr. Part No.CD74HC597E
SGD2.132
Each (In a Pack of 10)
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
RS Stock No. 145-0003
Mfr. Part No.CD4516BE
SGD0.734
Each (In a Tube of 25)
units
PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 709-1971
Mfr. Part No.SN74HC164N
SGD0.738
Each (In a Pack of 5)
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
RS Stock No. 910-1528
Mfr. Part No.MIC5821YN
BrandMicrochip
SGD4.08
Each (In a Pack of 5)
units
PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm
RS Stock No. 355-8934
Mfr. Part No.HEF4060BT,652
BrandNexperia
SGD0.74
Each
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
RS Stock No. 145-0027
Mfr. Part No.CD74HC597E
SGD2.132
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
RS Stock No. 922-2943
Mfr. Part No.SN74LS90N
SGD0.795
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 LS Through Hole Decade Up Counter 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 663-0124
Mfr. Part No.CD74HC190E
SGD2.03
Each (In a Pack of 5)
units
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 663-0379
Mfr. Part No.CD74HC4518E
SGD2.856
Each (In a Pack of 5)
units
PDIP Counter 4 HC Through Hole BCD Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 124-2264
Mfr. Part No.74HC595D,112
BrandNexperia
SGD0.468
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
RS Stock No. 145-9134
Mfr. Part No.MIC5821YN
BrandMicrochip
SGD3.396
Each (In a Tube of 25)
units
PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm
RS Stock No. 688-1537
Mfr. Part No.MC14094BDTR2G
SGD0.77
Each (In a Pack of 5)
units
TSSOP Shift Register 8 4000 Surface Mount - Up Counter 1 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 806-3289
Mfr. Part No.MC14518BDWG
SGD1.10
Each (In a Pack of 20)
units
SOIC W Counter 4 CMOS Surface Mount BCD Up Counter 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 689-8727
Mfr. Part No.MC74HC595ADR2G
SGD0.646
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
RS Stock No. 663-2782
Mfr. Part No.SN74LV8154PW
SGD1.908
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
RS Stock No. 145-0873
Mfr. Part No.CD74HC4518E
SGD2.28
Each (In a Tube of 25)
units
PDIP Counter 4 HC Through Hole BCD Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 634-619
Mfr. Part No.CD74HCT193E
SGD1.34
Each
units
PDIP Counter 4 HCT Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 709-2122
Mfr. Part No.CD4516BE
SGD0.734
Each (In a Pack of 10)
units
PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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