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庫存編號 483-6516
製造零件編號74HC40103D,652
BrandNexperia
TWD33.20
/個 (每包:5個)
單位
SOIC Counter 8 HC Surface Mount Binary Down Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 483-6695
製造零件編號74HCT165D,652
BrandNexperia
TWD19.20
/個 (每包:10個)
單位
SOIC Shift Register 8 HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 662-9562
製造零件編號CD4020BE
TWD16.80
/個 (每包:5個)
單位
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庫存編號 144-9939
製造零件編號CD4520BE
TWD15.50
毎管:25 個
單位
PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 791-8753
製造零件編號74HC595BQ,115
BrandNexperia
TWD10.20
/個 (每包:50個)
單位
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庫存編號 145-6607
製造零件編號CD4060BM
TWD14.70
毎管:40 個
單位
SOIC Counter 14 CD4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.5mm - -
RS庫存編號 177-6708
製造零件編號74HC4060D,652
BrandNexperia
TWD18.00
單位
SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 168-9619
製造零件編號HEF4017BT,652
BrandNexperia
TWD15.40
毎管:50 個
單位
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 709-2122
製造零件編號CD4516BE
TWD15.50
/個 (每包:10個)
單位
PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-0095
製造零件編號CD74HC164E
TWD19.70
/個 (每包:10個)
單位
PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 14 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 662-9717
製造零件編號CD4520BE
TWD19.20
/個 (每包:5個)
單位
PDIP Counter 4 4000 Through Hole Binary Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 634-619
製造零件編號CD74HCT193E
TWD29.00
單位
PDIP Counter 4 HCT Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 865-1599
製造零件編號HEF4021BT,652
BrandNexperia
TWD11.60
毎管:50 個
單位
SOIC Shift Register 8 HEF Surface Mount - Parallel to Serial 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 662-9556
製造零件編號CD40192BE
TWD19.20
/個 (每包:5個)
單位
PDIP Counter 4 4000 Through Hole Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 170-7972
製造零件編號HEF4094BT,653
BrandNexperia
TWD3.90
個 (在毎卷:2500)
單位
SO - 8 HEF Surface Mount - - 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 170-3420
製造零件編號MC14094BDR2G
TWD4.50
個 (在毎卷:2500)
單位
SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 144-9934
製造零件編號CD4026BE
TWD15.00
毎管:25 個
單位
PDIP Counter, Divider 5 4000 Through Hole Decade Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 809-6295
製造零件編號CD74HC595MT
TWD35.30
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 178-6973
製造零件編號74HC40103D,652
BrandNexperia
TWD28.40
毎管:50 個
單位
SOIC Counter 8 HC Surface Mount Binary Down Counter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 145-7005
製造零件編號CD74HC595MT
TWD27.10
個 (在毎卷:250)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm