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. 528-145
Mfr. Part No.TPIC6B595N
MYR5.75
Each (In a Pack of 5)
units
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
RS Stock No. 121-8438
Mfr. Part No.TPIC6B595N
MYR5.52
Each (In a Tube of 20)
units
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
RS Stock No. 145-0419
Mfr. Part No.CD4035BE
MYR3.077
Each (In a Tube of 25)
units
PDIP Shift Register 4 4000 Through Hole - Serial/Parallel to Parallel 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 662-9613
Mfr. Part No.CD4035BE
MYR5.444
Each (In a Pack of 5)
units
PDIP Shift Register 4 4000 Through Hole - Serial/Parallel to Parallel 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0090
Mfr. Part No.SN74LS194AN
MYR3.527
Each (In a Tube of 25)
units
PDIP Shift Register 4 LS Through Hole - Serial/Parallel to Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 304-986
Mfr. Part No.SN74LS194AN
MYR5.66
Each
units
PDIP Shift Register 4 LS Through Hole - Serial/Parallel to Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 663-0281
Mfr. Part No.CD74HC390M
MYR2.47
Each (In a Pack of 10)
units
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
RS Stock No. 662-7109
Mfr. Part No.CD74HC390M96
MYR1.972
Each (In a Pack of 10)
units
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
RS Stock No. 178-9161
Mfr. Part No.CD74HC390M96
MYR2.80
Each (In a Tube of 40)
units
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
RS Stock No. 178-9178
Mfr. Part No.CD74HC390M
MYR3.35
Each (In a Tube of 40)
units
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
RS Stock No. 163-0525
Mfr. Part No.MC14020BDG
MYR1.119
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. 634-574
Mfr. Part No.CD74HCT93E
MYR4.93
Each
units
PDIP Counter, Divider 4 HCT Through Hole Binary Up Counter 1 14 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 527-372
Mfr. Part No.SN74HC193N
MYR1.658
Each (In a Tube of 25)
units
PDIP Counter 4 HC Through Hole Binary Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 177-6865
Mfr. Part No.74HCT393D,652
BrandNexperia
MYR1.95
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. 121-8284
Mfr. Part No.SN74LS93N
MYR8.046
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 LS Through Hole Binary 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. 307-626
Mfr. Part No.SN74LS93N
MYR9.48
Each
units
PDIP Counter, Divider 4 LS Through Hole Binary 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. 178-6995
Mfr. Part No.74HCT393D,652
BrandNexperia
MYR1.577
Each (In a Tube of 57)
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. 145-0013
Mfr. Part No.SN74LS161ANE4
MYR1.768
Each (In a Tube of 25)
units
PDIP Counter 4 LS Through Hole Binary 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. 145-0684
Mfr. Part No.CD74HCT93E
MYR2.902
Each (In a Tube of 25)
units
PDIP Counter, Divider 4 HCT Through Hole Binary Up Counter 1 14 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 709-2463
Mfr. Part No.SN74LS161ANE4
MYR3.808
Each (In a Pack of 5)
units
PDIP Counter 4 LS Through Hole Binary 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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