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. 709-2453
Mfr. Part No.CD74HC390E
SGD0.93
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
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. 923-2304
Mfr. Part No.SN74LS92N
SGD3.84
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. 806-1634
Mfr. Part No.MC74HC595ADTG
SGD0.524
Each (In a Pack of 50)
units
TSSOP Shift Register 8 MC74 Surface Mount - Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
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. 709-2914
Mfr. Part No.CD74HC597E
SGD1.223
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. 163-0544
Mfr. Part No.MC14516BDG
SGD0.993
Each (In a Tube of 48)
units
SOIC Counter 4 CMOS Surface Mount Binary Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 662-9543
Mfr. Part No.CD4017BM
SGD0.646
Each (In a Pack of 10)
units
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 305-080
Mfr. Part No.SN74LS92N
SGD4.56
Each
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. 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. 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. 166-0098
Mfr. Part No.74HC595BQ,115
BrandNexperia
SGD0.155
Each (On a Reel of 3000)
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. 527-451
Mfr. Part No.CD4022BE
SGD0.646
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 4000 Through Hole Octal Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 121-8425
Mfr. Part No.SN74HC594N
SGD0.851
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. 144-9896
Mfr. Part No.SN74LS393N
SGD1.571
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 LS Through Hole Binary Up Counter 2 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-5786
Mfr. Part No.CD74HC393M
SGD0.979
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
RS Stock No. 145-0003
Mfr. Part No.CD4516BE
SGD0.492
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. 144-9934
Mfr. Part No.CD4026BE
SGD0.707
Each (In a Tube of 25)
units
PDIP Counter, Divider 5 4000 Through Hole Decade Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 121-8284
Mfr. Part No.SN74LS93N
SGD2.769
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 LS Through Hole Binary 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. 663-0313
Mfr. Part No.CD74HC4015M
SGD2.41
Each (In a Pack of 5)
units
SOIC Shift Register 4 HC Surface Mount - Serial to Parallel 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
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