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. 662-7121
Mfr. Part No.CD74HC4020M96
$0.942
Each (In a Pack of 5)
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. 663-1348
Mfr. Part No.SN74AHCT595PW
$0.833
Each (In a Pack of 10)
units
TSSOP Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 162-9176
Mfr. Part No.NLV74HC164ADR2G
$0.441
Each (On a Reel of 2500)
units
SOIC Shift Register 8 HC Surface Mount - Up Counter 1 14 2 V 6 V 8.75 x 4 x 1.5mm 8.75mm 4mm
RS Stock No. 922-2896
Mfr. Part No.CD4017BM
$0.732
Each (In a Tube of 40)
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SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 145-1015
Mfr. Part No.CD74HCT4040E
$0.95
Each (In a Tube of 25)
units
PDIP Counter 12 HCT Through Hole Binary Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 163-0526
Mfr. Part No.MC14022BDG
$0.815
Each (In a Tube of 48)
units
SOIC Counter 4 MC140 Surface Mount Octal - 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 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. 145-0448
Mfr. Part No.SN74AHCT594PW
$1.419
Each (In a Tube of 90)
units
TSSOP Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 178-5186
Mfr. Part No.STPIC6C595TTR
$1.062
Each (On a Reel of 2500)
units
TSSOP Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1mm 5mm 4.4mm
RS Stock No. 808-0098
Mfr. Part No.MC74HC164ADTR2G
$0.273
Each (On a Tape of 200)
units
TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 809-6289
Mfr. Part No.CD74HC4060PW
$0.794
Each (In a Pack of 10)
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TSSOP Counter 14 HC Surface Mount Binary - 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 162-4299
Mfr. Part No.SN74LS595N
$17.538
Each (In a Tube of 25)
units
PDIP Shift Register 8 LS Through Hole - Serial to Serial/Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 663-0648
Mfr. Part No.CD74HCT597M
$1.855
Each (In a Pack of 10)
units
SOIC Shift Register 8 HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 541-9241
Mfr. Part No.TC74HC4060AF(F)
BrandToshiba
$1.478
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. 171-3501
Mfr. Part No.74VHC161FT
BrandToshiba
$0.515
Each (In a Pack of 50)
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. 145-0188
Mfr. Part No.TPIC6B596DW
$2.123
Each (In a Tube of 25)
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. 145-1113
Mfr. Part No.SN74HC163PW
$0.566
Each (In a Tube of 90)
units
TSSOP Counter 4 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 145-0892
Mfr. Part No.SN74HC4040PW
$0.856
Each (In a Tube of 90)
units
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. 663-1981
Mfr. Part No.SN74HC165N
$0.83
Each (In a Pack of 5)
units
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 162-5278
Mfr. Part No.SN74HC165QPWRG4Q1
$0.29
Each (On a Reel of 2000)
units
TSSOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
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