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 483-6667
製造零件編號74HC597D,652
BrandNexperia
HK$3.118
/個 (每包:10個)
單位
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
RS庫存編號 178-6973
製造零件編號74HC40103D,652
BrandNexperia
HK$5.68
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 483-7963
製造零件編號HEF4520BT,652
BrandNexperia
HK$5.928
/個 (每包:20個)
單位
SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 436-7638
製造零件編號74HC595D,112
BrandNexperia
HK$2.406
毎管:50 個
單位
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
RS庫存編號 170-7956
製造零件編號74HC595D,118
BrandNexperia
HK$0.86
個 (在毎卷:2500)
單位
SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 166-1285
製造零件編號HEF4520BT,652
BrandNexperia
HK$1.528
毎管:50 個
單位
SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 483-6516
製造零件編號74HC40103D,652
BrandNexperia
HK$6.916
/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 791-8737
製造零件編號74HC393D,652
BrandNexperia
HK$3.223
/個 (每包:19個)
單位
SOIC Counter 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 146-0438
製造零件編號74HC594D,112
BrandNexperia
HK$4.504
毎管:50 個
單位
SOIC Shift Register 8 74HC Surface Mount - Serial to Parallel Converter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 816-4657
製造零件編號74HCT165PW,112
BrandNexperia
HK$1.60
/個 (每包:32個)
單位
TSSOP Shift Register 8 74HCT Surface Mount - Serial/Parallel to Serial 1 16 4.5 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 169-7294
製造零件編號74LVC595APW,112
BrandNexperia
HK$2.182
個 (在毎卷:2400)
單位
TSSOP Shift Register 8 74LVC Surface Mount - Serial to Serial/Parallel 1 16 1.65 V 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 170-5521
製造零件編號74HCT164D,653
BrandNexperia
HK$1.926
/個 (每包:50個)
單位
SO Shift Register 8 74HCT Surface Mount - Serial to Parallel 1 14 4.5 V 5.5 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 151-3376
製造零件編號74AHC594PW,118
BrandNexperia
HK$1.542
個 (在毎卷:2500)
單位
TSSOP Shift Register 8 74AH Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 177-6607
製造零件編號74HC164D,652
BrandNexperia
HK$10.40
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 170-8030
製造零件編號74HCT4094D,118
BrandNexperia
HK$1.215
個 (在毎卷:2500)
單位
SO - 8 74HCT 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 165-9891
製造零件編號74HC165PW,112
BrandNexperia
HK$1.746
毎管:96 個
單位
TSSOP Shift Register 8 74HC Surface Mount - Parallel to Serial 1 16 2 V 6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 813-9314
製造零件編號74HC4060BQ,115
BrandNexperia
HK$1.986
Each (On a Tape of 25)
單位
DHVQFN Counter - HC Surface Mount - - 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS庫存編號 791-8756
製造零件編號74HC4520D,112
BrandNexperia
HK$5.088
/個 (每包:10個)
單位
SOIC Counter 4 HC Surface Mount Binary Up Counter 2 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 368-6950
製造零件編號HEF4015BT,652
BrandNexperia
HK$3.086
毎管:50 個
單位
SOIC Shift Register 4 4000 Surface Mount - Serial to Parallel 2 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 177-6708
製造零件編號74HC4060D,652
BrandNexperia
HK$11.74
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