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. 145-0893
Mfr. Part No.SN74HC595PW
$0.853
Each (In a Tube of 90)
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
RS Stock No. 165-8511
Mfr. Part No.74LV165PW,112
BrandNexperia
$0.661
Each (In a Tube of 96)
units
TSSOP Shift Register 8 74LV Surface Mount - Serial/Parallel to Serial 1 16 1 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS Stock No. 186-9842
Mfr. Part No.MC14526BDWG
$1.368
Each (In a Pack of 10)
units
SOIC Counter 1 - Surface Mount Divide-By-N Down Counter - 16 3 V dc 18 V dc 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 739-5194
Mfr. Part No.74VHC595MTCX
$0.732
Each (In a Pack of 5)
units
TSSOP Shift Register 8 74VHC Surface Mount - Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 0.9mm 5mm 4.4mm
RS Stock No. 171-3532
Mfr. Part No.74VHC164FT
BrandToshiba
$0.463
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
RS Stock No. 184-4276
Mfr. Part No.MC74HC165ADTR2G
$0.156
Each (On a Reel of 2500)
units
TSSOP Shift Register 8 74HC Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 5.1 x 4.5 x 1.2mm 5.1mm 4.5mm
RS Stock No. 163-0601
Mfr. Part No.MC74HC4094ADR2G
$0.209
Each (On a Reel of 2500)
units
SOIC Shift Register 8 MC74 Surface Mount - Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-3289
Mfr. Part No.MC14518BDWG
$1.221
Each (In a Pack of 20)
units
SOIC W Counter 4 CMOS Surface Mount BCD Up Counter 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 910-1528
Mfr. Part No.MIC5821YN
BrandMicrochip
$4.62
Each (In a Pack of 5)
units
PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 - - 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm
RS Stock No. 541-9178
Mfr. Part No.TC74HC4020AF(F)
BrandToshiba
$1.488
Each (In a Pack of 5)
units
SOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V - 10.8mm 5.3mm
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. 171-3326
Mfr. Part No.74VHC165FT
BrandToshiba
$0.162
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. 171-3323
Mfr. Part No.74VHC161FT
BrandToshiba
$0.203
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. 152-6484
Mfr. Part No.74HCT595PW-Q100,11
BrandNexperia
$0.693
Each (On a Reel of 2500)
units
TSSOP Shift Register 8 74HCT Surface Mount - Serial to Parallel 1 16 4.5 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS Stock No. 709-2999
Mfr. Part No.SN74LS163AN
$1.354
Each (In a Pack of 5)
units
PDIP Counter 4 LS Through Hole Binary Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 637-911
Mfr. Part No.SN74LS592N
$19.88
Each
units
PDIP Counter 8 LS Through Hole Binary Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0191
Mfr. Part No.CD4015BE
$0.798
Each (In a Tube of 25)
units
PDIP Shift Register 4 4000 Through Hole - Serial to Parallel 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 806-1684
Mfr. Part No.MC74HCT595ADG
$0.596
Each (In a Pack of 48)
units
SOIC Shift Register 8 MC74 Surface Mount - Serial/Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 809-9452
Mfr. Part No.SN74AHC595PW
$0.858
Each (In a Pack of 10)
units
SOIC Shift Register 8 AHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 144-9945
Mfr. Part No.CD74HC164E
$0.95
Each (In a Tube of 25)
units
PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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