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. 807-2448
Mfr. Part No.CD74HC4020E
HK$4.43
Each (In a Pack of 25)
units
PDIP Counter 14 74HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm
RS Stock No. 663-0379
Mfr. Part No.CD74HC4518E
HK$15.23
Each (In a Pack of 5)
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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. 144-9996
Mfr. Part No.CD4518BE
HK$4.038
Each (In a Tube of 25)
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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. 663-2622
Mfr. Part No.SN74LS90N
HK$5.202
Each (In a Pack of 5)
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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. 709-2012
Mfr. Part No.SN74HC393NE4
HK$4.622
Each (In a Pack of 10)
units
PDIP Counter, Divider 4 HC Through Hole Binary Up Counter 2 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 662-9528
Mfr. Part No.CD40110BE
HK$13.35
Each (In a Pack of 5)
units
PDIP Counter 5 4000 Through Hole Decade 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. 121-8427
Mfr. Part No.SN74HC595DR
HK$1.143
Each (On a Reel of 2500)
units
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. 162-7390
Mfr. Part No.SN74HC393NE4
HK$1.72
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 HC Through Hole Binary Up Counter 2 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 121-9581
Mfr. Part No.74HC595S16-13
HK$1.09
Each (On a Reel of 2500)
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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. 162-7429
Mfr. Part No.SN74LV165AD
HK$3.89
Each (In a Tube of 40)
units
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 662-9565
Mfr. Part No.CD4021BE
HK$7.002
Each (In a Pack of 5)
units
PDIP Shift Register 8 4000 Through Hole - Serial/Parallel to Serial 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 709-2069
Mfr. Part No.SN74HC4040N
HK$4.09
Each (In a Pack of 10)
units
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. 145-0001
Mfr. Part No.SN74HC4040N
HK$4.09
Each (In a Tube of 25)
units
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. 637-933
Mfr. Part No.SN74LS595N
HK$86.40
Each
units
PDIP Shift Register 8 LS Through Hole - Serial to Serial/Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 689-8724
Mfr. Part No.MC74HC595ADG
HK$4.19
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. 178-7550
Mfr. Part No.MC14017BDR2G
HK$1.36
Each (On a Reel of 2500)
units
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 809-5829
Mfr. Part No.SN74HC595DT
HK$6.50
Each (In a Pack of 10)
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. 663-2713
Mfr. Part No.SN74LV165AD
HK$3.89
Each (In a Pack of 10)
units
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 145-0661
Mfr. Part No.CD40110BE
HK$11.38
Each (In a Tube of 25)
units
PDIP Counter 5 4000 Through Hole Decade 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. 921-5197
Mfr. Part No.CD74HC4059M96
HK$11.989
Each (On a Reel of 2000)
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SOIC Counter 5 74HC Surface Mount Divide-By-N Down Counter 1 24 2 V 6 V 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm
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