# 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.

...
Read more Read less
685

#### Filters

Viewing 1 - 20 of 685 products
Results per page
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
 New RS Stock No. 802-1418 Mfr. Part No.74VHC595M BrandON Semiconductor Compare HK\$3.526 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 New RS Stock No. 739-0136 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare HK\$4.69 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 New RS Stock No. 483-6667 Mfr. Part No.74HC597D,652 BrandNexperia Compare HK\$3.118 Each (In a Pack of 10) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 166-2453 Mfr. Part No.MM74HC595MX BrandON Semiconductor Compare 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 New RS Stock No. 921-5166 Mfr. Part No.CD4017BEE4 BrandTexas Instruments Compare HK\$3.01 Each (In a Tube of 25) units PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm New RS Stock No. 178-6973 Mfr. Part No.74HC40103D,652 BrandNexperia Compare HK\$5.68 Each (In a Tube of 50) units SOIC Counter 8 HC Surface Mount Binary Down Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 663-2101 Mfr. Part No.SN74HC4040D BrandTexas Instruments Compare HK\$3.746 Each (In a Pack of 10) units SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 732-0691 Mfr. Part No.CD4017BEE4 BrandTexas Instruments Compare HK\$4.294 Each (In a Pack of 5) units PDIP Counter, Divider 5 CMOS Through Hole Decade Up Counter 1 16 3 V 18 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm New RS Stock No. 483-7963 Mfr. Part No.HEF4520BT,652 BrandNexperia Compare HK\$3.962 Each (In a Pack of 20) units SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 663-0288 Mfr. Part No.CD74HC393M BrandTexas Instruments Compare HK\$4.364 Each (In a Pack of 10) units SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm New RS Stock No. 807-2448 Mfr. Part No.CD74HC4020E BrandTexas Instruments Compare HK\$3.721 Each (In a Pack of 25) units PDIP Counter 14 74HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm New RS Stock No. 178-9203 Mfr. Part No.SN74HC4040D BrandTexas Instruments Compare HK\$2.795 Each (In a Tube of 40) units SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm New RS Stock No. 910-1519 Mfr. Part No.MIC5841YN BrandMicrochip Compare HK\$29.755 Each (In a Pack of 2) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 18 - - 23.37 x 6.35 x 3.3mm 23.37mm 6.35mm New RS Stock No. 663-2105 Mfr. Part No.SN74HC4040PW BrandTexas Instruments Compare HK\$4.081 Each (In a Pack of 10) units TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 483-6516 Mfr. Part No.74HC40103D,652 BrandNexperia Compare HK\$6.916 Each (In a Pack of 5) units SOIC Counter 8 HC Surface Mount Binary Down Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 166-1285 Mfr. Part No.HEF4520BT,652 BrandNexperia Compare HK\$1.528 Each (In a Tube of 50) units SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 436-7638 Mfr. Part No.74HC595D,112 BrandNexperia Compare HK\$2.406 Each (In a Tube of 50) units SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm New RS Stock No. 145-5786 Mfr. Part No.CD74HC393M BrandTexas Instruments Compare HK\$3.163 Each (In a Tube of 50) units SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm New RS Stock No. 145-0892 Mfr. Part No.SN74HC4040PW BrandTexas Instruments Compare HK\$3.438 Each (In a Tube of 90) units TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm New RS Stock No. 165-4195 Mfr. Part No.MIC5841YN BrandMicrochip Compare HK\$22.602 Each (In a Tube of 21) units PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 18 - - 23.37 x 6.35 x 3.3mm 23.37mm 6.35mm
Related Products
PushPull bulkhead mounted housing with HARTING PushPull technologyCompact, ...
Description:
PushPull bulkhead mounted housing with HARTING PushPull technologyCompact, space-saving design for device integration of RJ45-, USB-, Signal- or Power-pcb femaleHigh packing density (spacing 27 x 21 mm).
IP67 Common Core field installable IEC 61076-3-106 Variant ...
Description:
IP67 Common Core field installable IEC 61076-3-106 Variant 1 compliant RJ45 industrial circular plug and receptacle kits for use with Cat 5e cable in harsh environments. These industrial circular Ethernet IP67 RJ45 plug and receptacle kits have a pass-through modular ...
19" rack mount unit 1 HU with 24 ...
Description:
19" rack mount unit 1 HU with 24 RJ45 jacks assembled on one common PCBNo special tooling required for mounting of cover (shielded type)Printed circuit board is mounted horizontallyGrounding using the enclosed earth connection cable (shielded types)360° shielding can be ...
Category 3 right angle SMT RJ11, RJ12 and ...
Description:
Category 3 right angle SMT RJ11, RJ12 and RJ45 modular jacks with an industry standard footprint and a low 11.5 mm profile. These cat 3 low profile modular RJ jacks have black UL 94V-0 thermoplastic housings, highly reliable gold plated ...