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 662-9789
製造零件編號CD74AC164M
HK$5.672
/個 (每包:5個)
單位
SOIC Shift Register 8 AC Surface Mount - Serial to Parallel 1 14 1.5 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
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 663-0086
製造零件編號CD74HC163M
HK$5.588
/個 (每包:10個)
單位
SOIC Counter 4 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 177-1600
製造零件編號HV5622PJ-G
BrandMicrochip
HK$40.474
毎管:27 個
單位
PLCC - - - Surface Mount - Serial to Parallel Converter 4 44 10.8 V 13.2 V 16.6 x 16.6 x 4.4mm 16.6mm 16.6mm
RS庫存編號 807-2393
製造零件編號CD4520BM
HK$3.206
/個 (每包:40個)
單位
SOIC Counter 4 4000 Surface Mount Binary Up Counter 2 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 527-205
製造零件編號TPIC6595DW
HK$27.532
/個 (每包:5個)
單位
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS庫存編號 169-7239
製造零件編號74HC595T16-13
HK$0.709
個 (在毎卷:2500)
單位
TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.93mm 5.1mm 4.5mm
RS庫存編號 662-9569
製造零件編號CD4021BM
HK$2.921
/個 (每包:10個)
單位
SOIC Shift Register 8 4000 Surface Mount - Serial/Parallel to Serial 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 103-8172
製造零件編號74HC4040D,652
BrandNexperia
HK$2.56
毎管:50 個
單位
SOIC Counter 12 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 798-9045
製造零件編號74HC595T16-13
HK$2.01
/個 (每包:25個)
單位
TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.93mm 5.1mm 4.5mm
RS庫存編號 162-4390
製造零件編號TPIC6595N
HK$20.086
毎管:20 個
單位
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
RS庫存編號 910-1427
製造零件編號MIC5891YN
BrandMicrochip
HK$17.16
/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 145-0173
製造零件編號SN74HC393D
HK$2.875
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 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 145-1253
製造零件編號SN74LV164AD
HK$2.015
毎管:50 個
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 103-8392
製造零件編號HEF4060BT,652
BrandNexperia
HK$2.479
毎管:50 個
單位
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 305-080
製造零件編號SN74LS92N
HK$22.00
單位
PDIP Counter, Divider 4 LS Through Hole Decade Up Counter 1 14 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 635-252
製造零件編號CD74HCT4040E
HK$5.51
單位
PDIP Counter 12 HCT Through Hole Binary 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 169-5675
製造零件編號SN74HC166DR
HK$1.216
個 (在毎卷:2500)
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 162-6960
製造零件編號CD74HC4520M96
HK$1.668
個 (在毎卷:2500)
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