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 802-1418
製造零件編號74VHC595M
HK$3.526
毎管:48 個
單位
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
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 739-0136
製造零件編號MM74HC595MX
HK$4.69
/個 (每包:5個)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 166-2453
製造零件編號MM74HC595MX
HK$1.63
個 (在毎卷:2500)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 145-0892
製造零件編號SN74HC4040PW
HK$3.438
毎管:90 個
單位
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
RS庫存編號 170-7956
製造零件編號74HC595D,118
BrandNexperia
HK$0.847
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 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 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 483-7963
製造零件編號HEF4520BT,652
BrandNexperia
HK$3.962
/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 663-2101
製造零件編號SN74HC4040D
HK$3.746
/個 (每包:10個)
單位
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
RS庫存編號 807-2448
製造零件編號CD74HC4020E
HK$3.721
/個 (每包:25個)
單位
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
RS庫存編號 178-9203
製造零件編號SN74HC4040D
HK$2.795
毎管:40 個
單位
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
RS庫存編號 732-0691
製造零件編號CD4017BEE4
HK$4.294
/個 (每包:5個)
單位
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
RS庫存編號 663-2105
製造零件編號SN74HC4040PW
HK$4.081
/個 (每包:10個)
單位
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
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 165-4195
製造零件編號MIC5841YN
BrandMicrochip
HK$22.602
毎管:21 個
單位
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
RS庫存編號 145-5786
製造零件編號CD74HC393M
HK$3.163
毎管:50 個
單位
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
RS庫存編號 663-0288
製造零件編號CD74HC393M
HK$4.364
/個 (每包:10個)
單位
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
RS庫存編號 910-1519
製造零件編號MIC5841YN
BrandMicrochip
HK$29.755
/個 (每包:2個)
單位
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
RS庫存編號 921-5166
製造零件編號CD4017BEE4
HK$3.01
毎管:25 個
單位
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