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. 186-9842
Mfr. Part No.MC14526BDWG
PHP40.90
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. 163-0546
Mfr. Part No.MC14526BDWR2G
PHP19.441
Each (On a Reel of 1000)
units
SOIC W Counter 3 CMOS Surface Mount Binary Down Counter 1 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 806-3315
Mfr. Part No.MC14557BDWG
PHP52.907
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. 145-2980
Mfr. Part No.MC14557BDWG
PHP51.92
Each (In a Tube of 47)
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. 186-9084
Mfr. Part No.MC14526BDWG
PHP40.915
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. 806-3286
Mfr. Part No.MC14526BDWR2G
PHP36.302
Each (On a Tape of 20)
units
SOIC W Counter 3 CMOS Surface Mount Binary Down Counter 1 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 145-2818
Mfr. Part No.MC74HC595ADG
PHP19.11
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. 689-8727
Mfr. Part No.MC74HC595ADR2G
PHP22.05
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. 689-8724
Mfr. Part No.MC74HC595ADG
PHP25.73
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. 163-2475
Mfr. Part No.MC74HC595ADR2G
PHP5.875
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. 806-3131
Mfr. Part No.MC14017BDG
PHP22.43
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. 739-5194
Mfr. Part No.74VHC595MTCX
PHP22.492
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. 186-9089
Mfr. Part No.MC74HC393ADG
PHP23.246
Each (In a Tube of 55)
units
SOIC Counter - HC Surface Mount Binary - - 14 2 V dc 6 V dc 8.75 x 4 x 1.5mm 8.75mm 4mm
RS Stock No. 166-2453
Mfr. Part No.MM74HC595MX
PHP10.414
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. 803-0967
Mfr. Part No.74VHC164MTCX
PHP18.01
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. 166-1698
Mfr. Part No.74VHC595MTCX
PHP7.40
Each (On a Reel of 2500)
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. 186-9621
Mfr. Part No.MM74HC164MX
PHP25.40
Each (In a Pack of 25)
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. 806-3135
Mfr. Part No.MC14018BDG
PHP26.30
Each (In a Pack of 20)
units
SOIC Counter 5 CMOS Surface Mount Divide-By-N Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 806-1432
Mfr. Part No.MC74HC165ADG
PHP17.84
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. 163-0544
Mfr. Part No.MC14516BDG
PHP33.925
Each (In a Tube of 48)
units
SOIC Counter 4 CMOS Surface Mount Binary Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm