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. 709-2025
Mfr. Part No.CD4518BE
HK$4.038
Each (In a Pack of 10)
units
PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 171-3005
Mfr. Part No.74HC595D
BrandToshiba
HK$0.942
Each (On a Reel of 2500)
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SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.2 x 3.9 x 1.38mm 10.2mm 3.9mm
RS Stock No. 806-3191
Mfr. Part No.MC14060BDR2G
HK$3.04
Each (In a Pack of 25)
units
SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 145-9134
Mfr. Part No.MIC5821YN
BrandMicrochip
HK$19.324
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. 163-0525
Mfr. Part No.MC14020BDG
HK$4.40
Each (In a Tube of 48)
units
SOIC Counter 14 CMOS Surface Mount Binary Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 662-8534
Mfr. Part No.SN74LV595APWR
HK$6.464
Each (In a Pack of 5)
units
TSSOP Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 809-5539
Mfr. Part No.CD74HCT191M
HK$6.05
Each (In a Pack of 40)
units
SOIC Counter 4 HCT Surface Mount - Down Counter, Up Counter 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 809-5788
Mfr. Part No.SN74HC193PW
HK$4.18
Each (In a Pack of 15)
units
TSSOP Counter 4 HC Surface Mount Binary Down Counter, Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
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Mfr. Part No.MC74HCT595ADTG
HK$3.113
Each (In a Tube of 96)
units
TSSOP Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 177-6865
Mfr. Part No.74HCT393D,652
BrandNexperia
HK$5.22
Each
units
SOIC Counter, Divider 4 HCT Surface Mount Binary Up Counter 2 14 4.5 V 5.5 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS Stock No. 709-2214
Mfr. Part No.SN74LS390N
HK$13.482
Each (In a Pack of 5)
units
PDIP Counter, Divider 4 LS Through Hole Decade Up Counter 2 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 761-3965
Mfr. Part No.MM74HC595MTCX
HK$3.27
Each (In a Pack of 10)
units
TSSOP Shift Register 8 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 5 x 4.4 x 0.9mm 5mm 4.4mm
RS Stock No. 145-6057
Mfr. Part No.CD4026BPW
HK$3.68
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
RS Stock No. 186-9084
Mfr. Part No.MC14526BDWG
HK$6.51
Each (In a Tube of 47)
units
SOIC Counter 1 - Surface Mount Divide-By-N Down Counter - 16 3 V dc 18 V dc 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 177-3523
Mfr. Part No.HV507PG-G
BrandMicrochip
HK$105.76
Each (In a Tray of 66)
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PQFN Shift Register 64 CMOS Surface Mount - Serial to Parallel Converter 18 80 4.5 V 5.5 V 20.2 x 14.2 x 2.9mm 20.2mm 14.2mm
RS Stock No. 146-0381
Mfr. Part No.74HCT4060D,652
BrandNexperia
HK$5.06
Each (In a Tube of 50)
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SOIC Counter 14 74HCT Surface Mount Binary Up Counter 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
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Mfr. Part No.CD74HC390M96
HK$4.54
Each (In a Pack of 10)
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SOIC Counter, Divider 4 HC Surface Mount Decade Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
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Mfr. Part No.TPIC6A595DW
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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
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Mfr. Part No.HEF4020BT,652
BrandNexperia
HK$5.23
Each (In a Tube of 50)
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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. 145-0871
Mfr. Part No.CD74HC4520E
HK$5.01
Each (In a Tube of 25)
units
PDIP Counter 4 HC Through Hole Binary Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm