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. 541-9588
Mfr. Part No.TC4020BP(F)
BrandToshiba
SGD1.19
Each (In a Pack of 5)
units
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS Stock No. 541-9897
Mfr. Part No.TC74AC163F(F)
BrandToshiba
SGD1.70
Each (In a Pack of 5)
units
SOP Counter 4 AC Surface Mount Binary Up Counter 1 16 2 V 5.5 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS Stock No. 539-9642
Mfr. Part No.TC74HC165AP(F)
BrandToshiba
SGD1.16
Each (In a Pack of 5)
units
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS Stock No. 171-3488
Mfr. Part No.74VHC4040FT
BrandToshiba
SGD0.392
Each (In a Pack of 25)
units
TSSOP Counter 12 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 171-3323
Mfr. Part No.74VHC161FT
BrandToshiba
SGD0.186
Each (On a Reel of 2500)
units
TSSOP Counter - 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 756-3094
Mfr. Part No.TC74VHC4040FT(EL,K
BrandToshiba
SGD1.122
Each (In a Pack of 5)
units
TSSOP Counter 12 CMOS Surface Mount Binary - 1 16 2 V 5.5 V 5.4 x 4.4 x 1mm 5.4mm 4.4mm
RS Stock No. 540-7866
Mfr. Part No.TC74HC165AF(F)
BrandToshiba
SGD1.54
Each (In a Pack of 5)
units
SOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS Stock No. 541-9623
Mfr. Part No.TC4040BP(F)
BrandToshiba
SGD0.818
Each (In a Pack of 5)
units
PDIP Counter, Divider 12 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS Stock No. 171-3351
Mfr. Part No.74VHC595FT
BrandToshiba
SGD0.14
Each (On a Reel of 2500)
units
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 756-2827
Mfr. Part No.TC4094BF(EL,N,F)
BrandToshiba
SGD2.36
Each (In a Pack of 5)
units
SOP Shift Register 8 CMOS Surface Mount - Serial/Parallel 1 16 3 V 18 V 10.8 x 5.3 x 1.5mm 10.8mm 5.3mm
RS Stock No. 541-9190
Mfr. Part No.TC74HC4040AF(F)
BrandToshiba
SGD1.38
Each (In a Pack of 5)
units
SOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V - 10.8mm 5.3mm
RS Stock No. 171-3343
Mfr. Part No.74VHC4040FT
BrandToshiba
SGD0.168
Each (On a Reel of 2500)
units
TSSOP Counter 12 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 171-3384
Mfr. Part No.74HC164D
BrandToshiba
SGD0.154
Each (On a Reel of 2500)
units
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.95 x 3.9 x 1.38mm 8.95mm 3.9mm
RS Stock No. 540-0231
Mfr. Part No.TC74HC4040AP(F)
BrandToshiba
SGD0.946
Each (In a Pack of 5)
units
PDIP Counter 12 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS Stock No. 541-9241
Mfr. Part No.TC74HC4060AF(F)
BrandToshiba
SGD1.488
Each (In a Pack of 5)
units
SOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10.8 x 5.3 x 1.5mm 10.8mm 5.3mm
RS Stock No. 171-3571
Mfr. Part No.74HC164D
BrandToshiba
SGD0.267
Each (In a Pack of 50)
units
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.95 x 3.9 x 1.38mm 8.95mm 3.9mm
RS Stock No. 171-3471
Mfr. Part No.74VHC4020FT
BrandToshiba
SGD0.392
Each (In a Pack of 25)
units
TSSOP Counter 14 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 171-3445
Mfr. Part No.74VHC595FT
BrandToshiba
SGD0.302
Each (In a Pack of 50)
units
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 541-9421
Mfr. Part No.TC74HC595AF(F)
BrandToshiba
SGD4.00
Each (In a Pack of 5)
units
SOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS Stock No. 643-9971
Mfr. Part No.TC74VHC163FT
BrandToshiba
SGD2.52
Each (In a Pack of 5)
units
TSSOP Counter 4 VHC Surface Mount Binary Up Counter 1 16 2 V 5.5 V 5.4 x 4.4 x 1mm 5.4mm 4.4mm