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. 601-4033
Mfr. Part No.TC4040BF(F)
BrandToshiba
$2.424
Each (In a Pack of 5)
units
SOP Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS Stock No. 179-2149
Mfr. Part No.CD74HC4024M
$1.036
Each (In a Tube of 50)
units
SOIC Counter 7 HC Surface Mount Binary Up Counter 1 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS Stock No. 464-271
Mfr. Part No.MC14040BDG
$0.656
Each (In a Pack of 20)
units
SOIC Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-1634
Mfr. Part No.MC74HC595ADTG
$0.53
Each (In a Pack of 50)
units
TSSOP Shift Register 8 MC74 Surface Mount - Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 662-7109
Mfr. Part No.CD74HC390M96
$0.748
Each (In a Pack of 10)
units
SOIC Counter, Divider 4 HC Surface Mount Decade Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 709-2012
Mfr. Part No.SN74HC393NE4
$0.887
Each (In a Pack of 10)
units
PDIP Counter, Divider 4 HC Through Hole Binary Up Counter 2 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 171-3351
Mfr. Part No.74VHC595FT
BrandToshiba
$0.206
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. 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. 739-0136
Mfr. Part No.MM74HC595MX
$0.992
Each (In a Pack of 5)
units
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-1435
Mfr. Part No.MC74HC161ADG
$0.357
Each (In a Pack of 48)
units
SOIC Counter 4 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 803-0967
Mfr. Part No.74VHC164MTCX
$0.229
Each (In a Pack of 20)
units
SOP Shift Register 8 VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 10.2 x 5.3 x 1.8mm 10.2mm 5.3mm
RS Stock No. 663-2442
Mfr. Part No.SN74LS165AD
$0.55
Each (In a Pack of 5)
units
SOIC Shift Register 8 LS Surface Mount - Serial to Serial/Parallel 1 16 4.75 V 5.25 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 169-7294
Mfr. Part No.74LVC595APW,112
BrandNexperia
$0.452
Each (On a Reel of 2400)
units
TSSOP Shift Register 8 74LVC Surface Mount - Serial to Serial/Parallel 1 16 1.65 V 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS Stock No. 171-3532
Mfr. Part No.74VHC164FT
BrandToshiba
$0.30
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. 581-748
Mfr. Part No.TC74VHC4040FK(EL,K
BrandToshiba
$1.26
Each (In a Pack of 5)
units
VSSOP Counter 12 VHC Surface Mount Binary Up Counter 1 16 2 V 5.5 V 4.25 x 3 x 0.8mm 4.25mm 3mm
RS Stock No. 333-2978
Mfr. Part No.SN74HC165N
$0.603
Each (In a Tube of 25)
units
PDIP Shift Register 8 HC Through Hole - Parallel to Serial Converter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 896-2628
Mfr. Part No.74VHC164FT(BE)
BrandToshiba
$0.659
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. 162-6950
Mfr. Part No.CD74HC4040M96
$0.374
Each (On a Reel of 2500)
units
SOIC Counter 12 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. 663-1332
Mfr. Part No.SN74AHCT594D
$1.28
Each (In a Pack of 5)
units
SOIC Shift Register 8 AHCT 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. 663-0607
Mfr. Part No.CD74HCT390M
$0.966
Each (In a Pack of 10)
units
SOIC Counter, Divider 4 HCT Surface Mount Decade Up Counter 2 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
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