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 540-0231
製造零件編號TC74HC4040AP(F)
BrandToshiba
HK$4.966
/個 (每包:5個)
單位
PDIP Counter 12 HC Through Hole Binary Up Counter 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 145-0448
製造零件編號SN74AHCT594PW
HK$7.21
毎管:90 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 121-9068
製造零件編號TPIC6B596N
HK$12.15
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 145-6870
製造零件編號CD74HCT164M96
HK$1.568
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HCT 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 663-2098
製造零件編號SN74HC393D
HK$3.852
/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 169-7807
製造零件編號74HC4094D,652
BrandNexperia
HK$4.58
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 170-8015
製造零件編號74HCT165D,653
BrandNexperia
HK$1.78
個 (在毎卷:2500)
單位
SO Shift Register 8 74HCT Surface Mount - Serial/Parallel to Serial 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 169-5691
製造零件編號SN74LV595ADR
HK$3.02
個 (在毎卷:2500)
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 809-6286
製造零件編號CD74HC595DW
HK$6.644
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm
RS庫存編號 806-3169
製造零件編號MC14029BDR2G
HK$4.326
Each (On a Tape of 20)
單位
SOIC Counter 4 CMOS Surface Mount Binary, Decade Down Counter, Up Counter 1 16 -0.5 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 663-1984
製造零件編號SN74HC165PW
HK$3.514
/個 (每包:10個)
單位
TSSOP Shift Register 8 HC Surface Mount - Parallel to Serial 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 170-7981
製造零件編號74HCT595D,118
BrandNexperia
HK$3.005
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 709-2914
製造零件編號CD74HC597E
HK$11.721
/個 (每包:10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 162-7392
製造零件編號SN74HC4020DR
HK$1.916
個 (在毎卷:2500)
單位
SOIC Counter 14 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 527-592
製造零件編號CD74HC4094PWR
HK$3.698
/個 (每包:25個)
單位
TSSOP Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 808-0111
製造零件編號MC74HC589ADR2G
HK$1.748
/個 (每包:100個)
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 663-2442
製造零件編號SN74LS165AD
HK$7.44
/個 (每包:5個)
單位
SOIC Shift Register 8 LS Surface Mount - Serial to Serial/Parallel 1 16 4.75 V 5.25 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 910-1427
製造零件編號MIC5891YN
BrandMicrochip
HK$18.602
/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 709-2031
製造零件編號CD4029BE
HK$3.411
/個 (每包:10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 662-7033
製造零件編號CD74HC161M96
HK$4.38
/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