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. 145-0892
Mfr. Part No.SN74HC4040PW
$0.856
Each (In a Tube of 90)
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TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 689-8727
Mfr. Part No.MC74HC595ADR2G
$0.716
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. 145-0941
Mfr. Part No.CD74ACT299M
$2.321
Each (In a Tube of 25)
units
SOIC Shift Register 8 ACT Surface Mount - Serial/Parallel to Serial/Parallel 1 20 4.5 V 5.5 V 13 x 7.6 x 2.35mm 13mm 7.6mm
RS Stock No. 662-9506
Mfr. Part No.CD40102BE
$2.39
Each (In a Pack of 5)
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PDIP Counter 8 4000 Through Hole Decade Down Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 816-8722
Mfr. Part No.74LV595PW,112
BrandNexperia
$1.224
Each (In a Pack of 8)
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TSSOP Shift Register 8 74LV Surface Mount - Serial to Serial/Parallel 1 16 1 V 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS Stock No. 806-3191
Mfr. Part No.MC14060BDR2G
$0.618
Each (In a Pack of 25)
units
SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 144-9996
Mfr. Part No.CD4518BE
$0.798
Each (In a Tube of 25)
units
PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0429
Mfr. Part No.CD74HC192E
$1.045
Each (In a Tube of 25)
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PDIP Counter 4 HC Through Hole Decade 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. 527-372
Mfr. Part No.SN74HC193N
$0.748
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. 541-9702
Mfr. Part No.TC4520BP(F)
BrandToshiba
$1.37
Each (In a Pack of 5)
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PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS Stock No. 169-5675
Mfr. Part No.SN74HC166DR
$0.235
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. 103-8179
Mfr. Part No.74HC4094D,652
BrandNexperia
$0.831
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
RS Stock No. 809-6295
Mfr. Part No.CD74HC595MT
$1.76
Each (In a Pack of 10)
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SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 170-7972
Mfr. Part No.HEF4094BT,653
BrandNexperia
$0.188
Each (On a Reel of 2500)
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SO - 8 HEF Surface Mount - - 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 170-8030
Mfr. Part No.74HCT4094D,118
BrandNexperia
$0.316
Each (On a Reel of 2500)
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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. 178-9181
Mfr. Part No.CD74HC4020M
$0.953
Each (In a Tube of 40)
units
SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 663-0329
Mfr. Part No.CD74HC4024E
$1.112
Each (In a Pack of 5)
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PDIP Counter 7 HC Through Hole Binary Up Counter 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 170-8019
Mfr. Part No.74HC597D,653
BrandNexperia
$0.303
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SO Shift Register 8 74HC Surface Mount - Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 740-5623
Mfr. Part No.NJU3730R-TE1
$3.26
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VSP Shift Register - - Surface Mount - Serial to Parallel 1 8 2.4 V 5.5 V 2.9 x 2.8 x 1.1mm 2.9mm 2.8mm
RS Stock No. 171-3488
Mfr. Part No.74VHC4040FT
BrandToshiba
$0.516
Each (In a Pack of 25)
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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