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. 802-1418
Mfr. Part No.74VHC595M
HK$4.573
Each (In a Tube of 48)
units
SOIC Shift Register 9 VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 9.9 x 3.9 x 1.45mm 9.9mm 3.9mm
RS Stock No. 166-2453
Mfr. Part No.MM74HC595MX
HK$1.63
Each (On a Reel of 2500)
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. 739-0136
Mfr. Part No.MM74HC595MX
HK$4.88
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. 163-2475
Mfr. Part No.MC74HC595ADR2G
HK$1.077
Each (On a Reel of 2500)
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. 689-8724
Mfr. Part No.MC74HC595ADG
HK$4.19
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. 145-2818
Mfr. Part No.MC74HC595ADG
HK$3.11
Each (In a Tube of 48)
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. 518-8745
Mfr. Part No.MC14017BDR2G
HK$4.23
Each
units
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 178-7550
Mfr. Part No.MC14017BDR2G
HK$1.36
Each (On a Reel of 2500)
units
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-3131
Mfr. Part No.MC14017BDG
HK$3.85
Each (In a Pack of 25)
units
SOIC Counter 5 CMOS Surface Mount Decade Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 689-8727
Mfr. Part No.MC74HC595ADR2G
HK$3.698
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. 806-1432
Mfr. Part No.MC74HC165ADG
HK$3.05
Each (In a Pack of 48)
units
SOIC Shift Register 8 MC74 Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-3315
Mfr. Part No.MC14557BDWG
HK$8.46
Each (In a Pack of 10)
units
SOIC W Shift Register 64 CMOS Surface Mount - Serial 1 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 186-9107
Mfr. Part No.MM74HC164MX
HK$1.99
Each (On a Reel of 2500)
units
SOIC Shift Register - HC Surface Mount - Serial to Parallel - 14 2 V 6 V 8.75 x 4 x 1.5mm 8.75mm 4mm
RS Stock No. 186-9674
Mfr. Part No.MC74HCT595ADTR2G
HK$3.07
Each (In a Pack of 25)
units
TSSOP Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 163-0526
Mfr. Part No.MC14022BDG
HK$4.00
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. 806-2172
Mfr. Part No.MC74AC161DG
HK$3.95
Each (In a Pack of 25)
units
SOIC Counter 4 AC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 186-9050
Mfr. Part No.FS7140-01G-XTD
HK$53.11
Each (In a Tube of 48)
units
SOIC Clock Generator - - Surface Mount - Serial - 16 3 V 3.6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 163-0527
Mfr. Part No.MC14029BDR2G
HK$1.75
Each (On a Reel of 2500)
units
SOIC Counter 4 CMOS Surface Mount Binary, Decade Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 186-9094
Mfr. Part No.MC74HC4094ADG
HK$3.121
Each (In a Tube of 48)
units
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel - 16 2 V dc 6 V dc 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-1634
Mfr. Part No.MC74HC595ADTG
HK$2.98
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