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. 806-1432
Mfr. Part No.MC74HC165ADG
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Each (In a Pack of 48)
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SOIC Shift Register 8 MC74 Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
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Mfr. Part No.74HC595S16-13
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SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 709-2069
Mfr. Part No.SN74HC4040NE4
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PDIP Counter 12 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 526-640
Mfr. Part No.SN74HC165DR
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SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 177-3797
Mfr. Part No.HV513K7-G
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WQFN Shift Register 8 CMOS Surface Mount - Serial to Parallel Converter 10 32 4.5 V 5.5 V 6.1 x 6.1 x 0.75mm 6.1mm 6.1mm
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Mfr. Part No.MC74VHC595DR2G
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Each (On a Tape of 20)
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SOIC Shift Register 3 MC74 Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
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Mfr. Part No.CD74HC4015M
HK$11.29
Each (In a Pack of 5)
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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
RS Stock No. 145-0394
Mfr. Part No.SN74LS169BN
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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
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Mfr. Part No.74HC191D,652
BrandNexperia
HK$4.03
Each (In a Pack of 10)
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SOIC Counter 4 HC Surface Mount Binary Down Counter, Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 368-8439
Mfr. Part No.HEF4794BT,112
BrandNexperia
HK$10.395
Each (In a Tube of 50)
units
SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 808-0111
Mfr. Part No.MC74HC589ADR2G
HK$1.782
Each (In a Pack of 100)
units
SOIC Shift Register 8 HC Surface Mount - Parallel to Serial, Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 809-9471
Mfr. Part No.SN74ALS165D
HK$6.291
Each (In a Pack of 10)
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SOIC Shift Register 8 ALS Surface Mount - Serial/Parallel to Serial 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 145-6875
Mfr. Part No.CD4059AM
HK$18.961
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SOIC Counter, Divider 5 4000 Surface Mount Divide-By-N Down Counter 1 24 3 V 12 V 15.4 x 7.52 x 2.35mm 15.4mm 7.52mm
RS Stock No. 145-0854
Mfr. Part No.CD4020BE
HK$2.424
Each (In a Tube of 25)
units
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 662-9604
Mfr. Part No.CD4033BE
HK$9.728
Each (In a Pack of 5)
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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. 145-7381
Mfr. Part No.SN74LV393AD
HK$5.57
Each (In a Tube of 50)
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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. 663-1978
Mfr. Part No.SN74HC164PW
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TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
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Mfr. Part No.MC14557BDWG
HK$6.062
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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
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Mfr. Part No.SN74HC161NE4
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PDIP Counter 4 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 162-6915
Mfr. Part No.CD40103BNSR
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SOP Counter 8 4000 Surface Mount Binary Down Counter 1 16 3 V 18 V 10.3 x 5.3 x 1.95mm 10.3mm 5.3mm
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