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. 662-7140
Mfr. Part No.CD74HC4060M96
HK$3.183
Each (In a Pack of 10)
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
RS Stock No. 171-3571
Mfr. Part No.74HC164D
BrandToshiba
HK$2.653
Each (In a Pack of 50)
units
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.95 x 3.9 x 1.38mm 8.95mm 3.9mm
RS Stock No. 145-7151
Mfr. Part No.CD40102BE
HK$10.18
Each (In a Tube of 25)
units
PDIP Counter 8 4000 Through Hole Decade Down Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0773
Mfr. Part No.CD74HC4060PW
HK$4.04
Each (In a Tube of 90)
units
TSSOP Counter 14 HC Surface Mount Binary - 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 103-5686
Mfr. Part No.74HC595PW,112
BrandNexperia
HK$2.34
Each (In a Tube of 96)
units
TSSOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS Stock No. 663-0329
Mfr. Part No.CD74HC4024E
HK$5.65
Each (In a Pack of 5)
units
PDIP Counter 7 HC Through Hole Binary Up Counter 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 663-1981
Mfr. Part No.SN74HC165N
HK$4.234
Each (In a Pack of 5)
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. 145-0195
Mfr. Part No.CD74HCT393EE4
HK$2.915
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 HCT Through Hole Binary Up Counter 2 14 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 806-1634
Mfr. Part No.MC74HC595ADTG
HK$2.966
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. 145-5722
Mfr. Part No.CD74ACT161M
HK$5.78
Each (In a Tube of 40)
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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
RS Stock No. 145-0188
Mfr. Part No.TPIC6B596DW
HK$10.78
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
RS Stock No. 663-2757
Mfr. Part No.SN74LV393AD
HK$9.75
Each (In a Pack of 5)
units
SOIC Counter, Divider 4 LV Surface Mount Binary Up Counter 2 14 2 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS Stock No. 662-7092
Mfr. Part No.CD74HC299M96
HK$7.36
Each (In a Pack of 5)
units
SOIC Shift Register 8 HC Surface Mount - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS Stock No. 541-9702
Mfr. Part No.TC4520BP(F)
BrandToshiba
HK$6.69
Each (In a Pack of 5)
units
PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS Stock No. 163-0598
Mfr. Part No.MC74HC4020ADR2G
HK$1.43
Each (On a Reel of 2500)
units
SOIC Counter 14 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 709-2914
Mfr. Part No.CD74HC597E
HK$11.721
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. 806-3141
Mfr. Part No.MC14022BDG
HK$2.374
Each (In a Pack of 25)
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SOIC Counter 4 MC140 Surface Mount Octal - 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 165-4112
Mfr. Part No.MIC5841YWM
BrandMicrochip
HK$26.305
Each (In a Tube of 41)
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SOIC W Driver, Shift Register 8 MIC Surface Mount - Serial to Serial/Parallel 1 18 - - 11.66 x 7.65 x 2.39mm 11.66mm 7.65mm
RS Stock No. 307-705
Mfr. Part No.SN74LS191N
HK$9.41
Each
units
PDIP Counter 4 LS Through Hole Binary Down Counter, Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-1120
Mfr. Part No.CD74HC595DW
HK$6.45
Each (In a Tube of 40)
units
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm