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. 540-0095
Mfr. Part No.TC74HC595AP(F)
BrandToshiba
$2.876
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. 756-2836
Mfr. Part No.TC4094BP(N,F)
BrandToshiba
$1.338
Each (In a Pack of 5)
units
PDIP Shift Register 8 CMOS Through Hole - Serial/Parallel 1 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS Stock No. 541-9623
Mfr. Part No.TC4040BP(F)
BrandToshiba
$0.922
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. 540-0304
Mfr. Part No.TC74HC4060AP(F)
BrandToshiba
$2.47
Each (In a Pack of 5)
units
PDIP Counter 14 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS Stock No. 540-0203
Mfr. Part No.TC74HC4020AP(F)
BrandToshiba
$0.98
Each (In a Pack of 5)
units
PDIP Counter 14 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. 541-9421
Mfr. Part No.TC74HC595AF(F)
BrandToshiba
$2.736
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. 540-0231
Mfr. Part No.TC74HC4040AP(F)
BrandToshiba
$2.248
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. 896-2628
Mfr. Part No.74VHC164FT(BE)
BrandToshiba
$0.54
Each (In a Pack of 10)
units
TSSOP Shift Register - VHC Surface Mount - - 1 14 2 V 5.5 V 5 x 4.4 x 1mm 5mm 4.4mm
RS Stock No. 171-3532
Mfr. Part No.74VHC164FT
BrandToshiba
$0.248
Each (In a Pack of 50)
units
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
New
RS Stock No. 581-792
Mfr. Part No.TC74VHC595FK(EL,K)
BrandToshiba
$1.152
Each (In a Pack of 5)
units
VSSOP Shift Register 8 VHC Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 4 x 3 x 0.8mm 4mm 3mm
RS Stock No. 756-2827
Mfr. Part No.TC4094BF(EL,N,F)
BrandToshiba
$2.224
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. 171-3384
Mfr. Part No.74HC164D
BrandToshiba
$0.163
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. 171-3488
Mfr. Part No.74VHC4040FT
BrandToshiba
$0.39
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. 171-3571
Mfr. Part No.74HC164D
BrandToshiba
$0.266
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. 756-2971
Mfr. Part No.TC74HC595AF(EL,F)
BrandToshiba
$1.628
Each (In a Pack of 5)
units
SOP Shift Register 3 CMOS Surface Mount - Serial/Parallel 1 16 2 V 6 V 10.8 x 5.3 x 1.5mm 10.8mm 5.3mm
RS Stock No. 171-3341
Mfr. Part No.74VHC393FT
BrandToshiba
$0.187
Each (On a Reel of 2500)
units
TSSOP Counter - 74VHC Surface Mount Binary - 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS Stock No. 171-3471
Mfr. Part No.74VHC4020FT
BrandToshiba
$0.39
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. 644-0375
Mfr. Part No.TC74AC164FT
BrandToshiba
$1.638
Each (In a Pack of 5)
units
TSSOP Shift Register 8 AC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 5 x 4.4 x 1mm 5mm 4.4mm
RS Stock No. 539-8655
Mfr. Part No.TC74AC163P(F)
BrandToshiba
$3.356
Each (In a Pack of 5)
units
PDIP Counter 4 AC Through Hole Binary Up Counter 1 16 2 V 5.5 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS Stock No. 541-9910
Mfr. Part No.TC74AC166F(F)
BrandToshiba
$2.812
Each (In a Pack of 5)
units
SOP Shift Register 8 AC Surface Mount - Serial to Serial/Parallel - 16 2 V 5.5 V 10 x 4.4 x 1.5mm 10mm 4.4mm