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. 526-202
Mfr. Part No.SN74LV165APWR
$0.576
Each (In a Pack of 20)
units
TSSOP Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 809-6239
Mfr. Part No.CD4520BPW
$0.787
Each (In a Pack of 15)
units
TSSOP Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 662-9562
Mfr. Part No.CD4020BE
$0.994
Each (In a Pack of 5)
units
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 922-2962
Mfr. Part No.TPIC6A595DW
$5.533
Each (In a Tube of 25)
units
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 24 4.5 V 5.5 V 15.4 x 7.52 x 2.35mm 15.4mm 7.52mm
RS Stock No. 145-0854
Mfr. Part No.CD4020BE
$0.816
Each (In a Tube of 25)
units
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0135
Mfr. Part No.CD40193BE
$0.77
Each (In a Tube of 25)
units
PDIP Counter 4 4000 Through Hole Binary 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. 145-0090
Mfr. Part No.SN74LS194AN
$2.222
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. 170-7987
Mfr. Part No.74HC165D,653
BrandNexperia
$0.169
Each (On a Reel of 2500)
units
SO Shift Register 8 74HC Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 806-3324
Mfr. Part No.MC14569BDWG
$4.004
Each (In a Pack of 5)
units
SOIC W Counter 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 144-9930
Mfr. Part No.CD4021BEE4
$0.50
Each (In a Tube of 25)
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. 170-7981
Mfr. Part No.74HCT595D,118
BrandNexperia
$0.63
Each (On a Reel of 2500)
units
SO - 8 74HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 806-3327
Mfr. Part No.MC14569BDWR2G
$5.126
Each (On a Tape of 5)
units
SOIC W Counter 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 166-0098
Mfr. Part No.74HC595BQ,115
BrandNexperia
$0.173
Each (On a Reel of 3000)
units
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 806-3131
Mfr. Part No.MC14017BDG
$0.782
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. 526-662
Mfr. Part No.SN74HC594D
$1.266
Each (In a Pack of 5)
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. 709-2069
Mfr. Part No.SN74HC4040N
$0.831
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. 528-145
Mfr. Part No.TPIC6B595N
$2.904
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. 806-3135
Mfr. Part No.MC14018BDG
$0.873
Each (In a Pack of 20)
units
SOIC Counter 5 CMOS Surface Mount Divide-By-N Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 923-3732
Mfr. Part No.TPIC6595DWR
$2.479
Each (On a Reel of 2000)
units
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS Stock No. 103-8181
Mfr. Part No.74HC165D,652
BrandNexperia
$0.524
Each (In a Tube of 50)
units
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
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