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. 635-252
Mfr. Part No.CD74HCT4040E
$0.85
Each
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. 305-018
Mfr. Part No.SN74LS164N
$1.20
Each
units
PDIP Shift Register 8 LS Through Hole - Serial to Parallel 1 14 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.CD4015BEE4
$0.345
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. 186-9078
Mfr. Part No.MC14014BDG
$0.747
Each (In a Tube of 48)
units
SOIC Shift Register 8 - Surface Mount - Parallel to Serial - 16 3 V dc 18 V dc 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 186-9084
Mfr. Part No.MC14526BDWG
$1.383
Each (In a Tube of 47)
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. 144-9944
Mfr. Part No.CD74HC165E
$0.411
Each (In a Tube of 25)
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. 169-5691
Mfr. Part No.SN74LV595ADR
$0.551
Each (On a Reel of 2500)
units
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS Stock No. 662-9506
Mfr. Part No.CD40102BE
$1.736
Each (In a Pack of 5)
units
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. 806-2595
Mfr. Part No.MC100EP016AMNG
$29.04
Each
units
QFN Counter 8 ECL Surface Mount Binary Up Counter 1 32 3 V 3.6 V 5 x 5 x 0.95mm 5mm 5mm
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. 170-5521
Mfr. Part No.74HCT164D,653
BrandNexperia
$0.40
Each (In a Pack of 50)
units
SO Shift Register 8 74HCT Surface Mount - Serial to Parallel 1 14 4.5 V 5.5 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS Stock No. 662-9206
Mfr. Part No.TPIC6C596PWR
$1.478
Each (In a Pack of 5)
units
TSSOP Shift Register 8 - 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. 663-0130
Mfr. Part No.CD74HC192E
$0.728
Each (In a Pack of 5)
units
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. 663-0521
Mfr. Part No.CD74HCT166M
$0.464
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. 805-1974
Mfr. Part No.NLV74HC164ADR2G
$0.535
Each (In a Pack of 25)
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. 806-3147
Mfr. Part No.MC14021BDG
$0.658
Each (In a Pack of 25)
units
SOIC Shift Register 8 CMOS Surface Mount - Parallel to Serial 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 171-3445
Mfr. Part No.74VHC595FT
BrandToshiba
$0.364
Each (In a Pack of 50)
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. 740-5610
Mfr. Part No.NJU3712AV-TE1
$2.84
Each
units
SSOP Shift Register - - Surface Mount - Serial to Parallel 1 16 2.4 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 165-8733
Mfr. Part No.74LVC595ABQ,115
BrandNexperia
$0.366
Each (On a Reel of 3000)
units
QFN Shift Register 8 74LVC Surface Mount - Serial to Serial/Parallel 1 16 1.65 V 3.6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 709-2914
Mfr. Part No.CD74HC597EE4
$1.245
Each (In a Pack of 10)
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
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