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 662-9506
製造零件編號CD40102BE
HK$11.98
/個 (每包:5個)
單位
PDIP Counter 8 4000 Through Hole Decade Down Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 186-9097
製造零件編號MC74HCT595ADTG
HK$3.113
毎管:96 個
單位
TSSOP Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 122-2837
製造零件編號74HCT595S16-13
HK$1.17
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HCT Surface Mount Octal Serial to Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 709-2453
製造零件編號CD74HC390E
HK$4.96
/個 (每包:10個)
單位
PDIP Counter, Divider 4 HC Through Hole Decade Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-1414
製造零件編號SN74ALS164AD
HK$22.50
/個 (每包:5個)
單位
SOIC Shift Register 8 ALS 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
RS庫存編號 145-2976
製造零件編號MC14015BDG
HK$4.59
毎管:48 個
單位
SOIC Shift Register 4 CMOS Surface Mount Divide-By-N Serial/Parallel 2 16 -0.5 V +18 V 19.55 x 6.85 x 3.43mm 19.55mm 6.85mm
RS庫存編號 163-0604
製造零件編號MC74HC589ADR2G
HK$1.20
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Parallel to Serial, Serial 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 809-6295
製造零件編號CD74HC595MT
HK$7.797
/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 816-4688
製造零件編號74HCT4020D,652
BrandNexperia
HK$4.71
/個 (每包:25個)
單位
SOIC Counter 14 74HCT Surface Mount Binary Up Counter 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 217-5695
製造零件編號SN74HC595N
HK$4.25
單位
PDIP Shift Register 8 HC Through Hole - Serial to Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 162-7238
製造零件編號CD40161BE
HK$3.914
毎管:25 個
單位
PDIP Counter 4 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 145-0070
製造零件編號SN74HC165D
HK$3.791
毎管:40 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 923-6706
製造零件編號CD4060BE
HK$4.036
毎管:25 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 162-9176
製造零件編號NLV74HC164ADR2G
HK$2.16
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Up Counter 1 14 2 V 6 V 8.75 x 4 x 1.5mm 8.75mm 4mm
RS庫存編號 663-0294
製造零件編號CD74HC40103E
HK$11.38
/個 (每包:5個)
單位
PDIP Counter 8 HC Through Hole Binary Down Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 186-9764
製造零件編號MC14021BDR2G
HK$3.07
/個 (每包:25個)
單位
SOIC Shift Register 8 - Surface Mount - Parallel to Serial - 16 3 V dc 18 V dc 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 144-9932
製造零件編號CD4022BE
HK$2.216
毎管:25 個
單位
PDIP Counter, Divider 4 4000 Through Hole Octal 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 145-0027
製造零件編號CD74HC597E
HK$6.966
毎管:25 個
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 809-5788
製造零件編號SN74HC193PW
HK$4.18
/個 (每包:15個)
單位
TSSOP Counter 4 HC Surface Mount Binary Down Counter, 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 170-8030
製造零件編號74HCT4094D,118
BrandNexperia
HK$1.61
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