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. 806-1432
Mfr. Part No.MC74HC165ADG
$0.622
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. 163-0552
Mfr. Part No.MC14569BDWR2G
$2.706
Each (On a Reel of 1000)
units
SOIC W Counter 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 806-3135
Mfr. Part No.MC14018BDG
$0.873
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. 806-3324
Mfr. Part No.MC14569BDWG
$4.004
Each (In a Pack of 5)
units
SOIC W Counter 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 178-7550
Mfr. Part No.MC14017BDR2G
$0.267
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. 806-3327
Mfr. Part No.MC14569BDWR2G
$5.126
Each (On a Tape of 5)
units
SOIC W Counter 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS Stock No. 806-3131
Mfr. Part No.MC14017BDG
$0.782
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. 518-8745
Mfr. Part No.MC14017BDR2G
$0.84
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. 163-0546
Mfr. Part No.MC14526BDWR2G
$0.636
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. 186-9947
Mfr. Part No.FS7140-01G-XTD
$13.29
Each (In a Pack of 2)
units
SOIC Clock Generator - - Surface Mount - Serial - 16 3 V 3.6 V 10 x 4 x 1.5mm 10mm 4mm
RS Stock No. 184-1289
Mfr. Part No.MM74HC595M
$0.975
Each (In a Pack of 20)
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. 186-9107
Mfr. Part No.MM74HC164MX
$0.455
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. 186-9712
Mfr. Part No.MC74HC393ADG
$0.756
Each (In a Pack of 25)
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. 186-9719
Mfr. Part No.MC14014BDG
$0.807
Each (In a Pack of 25)
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. 464-261
Mfr. Part No.MC74HC589ADG
$0.448
Each (In a Pack of 20)
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. 806-3289
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. 806-1564
Mfr. Part No.MC74HC4040ADG
$0.792
Each (In a Pack of 48)
units
SOIC Counter 12 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
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. 146-2098
Mfr. Part No.74VHC164MTCX
$0.232
Each (On a Reel of 2500)
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. 145-2980
Mfr. Part No.MC14557BDWG
$1.661
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