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 688-1537
製造零件編號MC14094BDTR2G
HK$3.348
/個 (每包:5個)
單位
TSSOP Shift Register 8 4000 Surface Mount - Up Counter 1 16 3 V 18 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 121-9245
製造零件編號CD4029BEE4
HK$2.271
毎管:25 個
單位
PDIP Counter 4 4000 Through Hole Binary, 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 171-3326
製造零件編號74VHC165FT
BrandToshiba
HK$0.967
個 (在毎卷:2500)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 663-1341
製造零件編號SN74AHCT594PW
HK$6.966
/個 (每包:5個)
單位
TSSOP Shift Register 8 AHCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 145-0429
製造零件編號CD74HC192E
HK$4.254
毎管:25 個
單位
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
全新
RS庫存編號 186-9597
製造零件編號74VHC595MX
HK$4.958
/個 (每包:25個)
單位
SOIC Shift Register - VHC Surface Mount - Serial to Parallel 1 16 2 V +5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 483-6695
製造零件編號74HCT165D,652
BrandNexperia
HK$3.284
/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 662-7165
製造零件編號CD74HC4520M96
HK$4.396
/個 (每包:5個)
單位
SOIC Counter 4 HC Surface Mount Binary Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
全新
RS庫存編號 186-9084
製造零件編號MC14526BDWG
HK$6.672
毎管:47 個
單位
SOIC Counter 1 - Surface Mount Divide-By-N Down Counter - 16 3 V dc 18 V dc 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS庫存編號 145-1063
製造零件編號CD74HC4015M
HK$9.38
毎管:40 個
單位
SOIC Shift Register 4 HC Surface Mount - Serial to Parallel 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 170-5422
製造零件編號74HC4094PW,118
BrandNexperia
HK$2.829
/個 (每包:25個)
單位
TSSOP Shift Register 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 163-0599
製造零件編號MC74HC4040ADTR2G
HK$1.795
個 (在毎卷:2500)
單位
TSSOP Counter 12 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 145-6607
製造零件編號CD4060BM
HK$2.697
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 910-1427
製造零件編號MIC5891YN
BrandMicrochip
HK$20.762
/個 (每包:5個)
單位
PDIP Driver, Shift Register 8 MIC Through Hole - Serial to Serial/Parallel 1 16 5 V 12 V 19.81 x 6.35 x 3.3mm 19.81mm 6.35mm
RS庫存編號 662-9786
製造零件編號CD74AC164E
HK$8.234
/個 (每包:5個)
單位
PDIP Shift Register 8 AC Through Hole - Serial to Parallel 1 14 1.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
全新
RS庫存編號 186-9621
製造零件編號MM74HC164MX
HK$4.398
/個 (每包:25個)
單位
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庫存編號 806-1634
製造零件編號MC74HC595ADTG
HK$2.357
/個 (每包:50個)
單位
TSSOP Shift Register 8 MC74 Surface Mount - Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 541-9623
製造零件編號TC4040BP(F)
BrandToshiba
HK$7.136
/個 (每包:5個)
單位
PDIP Counter, Divider 12 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 165-4085
製造零件編號MIC5891YWM
BrandMicrochip
HK$16.346
毎管:47 個
單位
SOIC W Driver, Shift Register 8 MIC Surface Mount - Serial to Serial/Parallel 1 16 5 V 12 V 10.39 x 7.65 x 2.39mm 10.39mm 7.65mm
RS庫存編號 145-1060
製造零件編號CD74ACT164M
HK$5.171
毎管:50 個
單位
SOIC Shift Register 8 ACT Surface Mount - Serial to Parallel 1 14 4.5 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm