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. 145-0873
Mfr. Part No.CD74HC4518E
HK$9.664
Each (In a Tube of 25)
units
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. 922-2896
Mfr. Part No.CD4017BM
HK$3.001
Each (In a Tube of 40)
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. 663-2622
Mfr. Part No.SN74LS90N
HK$17.722
Each (In a Pack of 5)
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. 709-2012
Mfr. Part No.SN74HC393NE4
HK$3.602
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. 527-520
Mfr. Part No.SN74HC595DR
HK$3.59
Each (In a Pack of 25)
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. 163-2475
Mfr. Part No.MC74HC595ADR2G
HK$1.077
Each (On a Reel of 2500)
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. 662-9584
Mfr. Part No.CD4024BM
HK$2.841
Each (In a Pack of 10)
units
SOIC Counter, Divider 7 4000 Surface Mount Binary Up Counter 1 14 3 V 18 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS Stock No. 662-9528
Mfr. Part No.CD40110BE
HK$11.072
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$1.43
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. 526-757
Mfr. Part No.SN74HC595D
HK$3.712
Each (In a Tube of 40)
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. 145-2818
Mfr. Part No.MC74HC595ADG
HK$1.745
Each (In a Tube of 48)
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. 709-2069
Mfr. Part No.SN74HC4040NE4
HK$3.459
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. 662-9565
Mfr. Part No.CD4021BEE4
HK$5.146
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. 162-7429
Mfr. Part No.SN74LV165AD
HK$1.596
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. 689-8724
Mfr. Part No.MC74HC595ADG
HK$3.278
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. 806-1432
Mfr. Part No.MC74HC165ADG
HK$2.212
Each (In a Pack of 48)
units
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
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. 806-3131
Mfr. Part No.MC14017BDG
HK$3.122
Each (In a Pack of 25)
units
SOIC Counter 5 CMOS Surface Mount Decade Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 145-0417
Mfr. Part No.CD4024BM
HK$1.801
Each (In a Tube of 50)
units
SOIC Counter, Divider 7 4000 Surface Mount Binary Up Counter 1 14 3 V 18 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS Stock No. 808-0091
Mfr. Part No.MC74HC165ADR2G
HK$1.33
Each (In a Pack of 200)
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
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