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. 178-9075
Mfr. Part No.TPIC6C595N
$1.804
Each (In a Tube of 25)
units
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 145-0090
Mfr. Part No.SN74LS194AN
$2.222
Each (In a Tube of 25)
units
PDIP Shift Register 4 LS Through Hole - Serial/Parallel to Parallel 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS Stock No. 809-6239
Mfr. Part No.CD4520BPW
$0.787
Each (In a Pack of 15)
units
TSSOP Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS Stock No. 121-8422
Mfr. Part No.TPIC6595DW
$5.148
Each (In a Tube of 25)
units
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS Stock No. 170-7987
Mfr. Part No.74HC165D,653
BrandNexperia
$0.169
Each (On a Reel of 2500)
units
SO Shift Register 8 74HC Surface Mount - Serial/Parallel to Serial 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 791-8753
Mfr. Part No.74HC595BQ,115
BrandNexperia
$0.509
Each (In a Pack of 50)
units
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 166-0098
Mfr. Part No.74HC595BQ,115
BrandNexperia
$0.173
Each (On a Reel of 3000)
units
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS Stock No. 121-8438
Mfr. Part No.TPIC6B595N
$2.453
Each (In a Tube of 20)
units
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
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. 527-205
Mfr. Part No.TPIC6595DW
$5.72
Each (In a Pack of 5)
units
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
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. 113-0629
Mfr. Part No.74HC4040D,652
BrandNexperia
$0.90
Each
units
SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS Stock No. 921-5197
Mfr. Part No.CD74HC4059M96
$2.379
Each (On a Reel of 2000)
units
SOIC Counter 5 74HC Surface Mount Divide-By-N Down Counter 1 24 2 V 6 V 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm
RS Stock No. 121-9235
Mfr. Part No.SN74LV165APW
$0.793
Each (In a Tube of 90)
units
TSSOP Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
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. 732-0922
Mfr. Part No.CD74HC4059M96
$4.55
Each
units
SOIC Counter 5 74HC Surface Mount Divide-By-N Down Counter 1 24 2 V 6 V 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm
RS Stock No. 662-9562
Mfr. Part No.CD4020BE
$0.994
Each (In a Pack of 5)
units
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
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. 526-202
Mfr. Part No.SN74LV165APWR
$0.576
Each (In a Pack of 20)
units
TSSOP Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS Stock No. 355-8934
Mfr. Part No.HEF4060BT,652
BrandNexperia
$4.71
Each
units
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
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