Datasheet > 8421002AGI

8421002AGI

更新时间： 2023-02-15 00:00:00

品牌	Logo	应用领域
艾迪悌 - IDT		光电二极管
页数	文件大小	规格书
15页	1081K
描述
Clock Generator, 226.66MHz, PDSO20, 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20

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8421002AGI 数据手册

ICS8421002I

FEMTOCLOCKS™ CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER

POWER CONSIDERATIONS

This section provides information on power dissipation and junction temperature for the ICS8421002I.

Equations and example calculations are also provided.

1. Power Dissipation.

The total power dissipation for the ICS8421002I is the sum of the core power plus the power dissipated in the load(s).

The following is the power dissipation for V = 3.3V + 5ꢀ = 3.465V, which gives worst case results.

NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.

•

Power (core) = V

* I

= 3.465V * 122mA = 422.7mW

DD_MAX

MAX

DD_MAX

Power (outputs) = 32.8mW/Loaded Output pair

MAX

If all outputs are loaded, the total power is 2 * 32.8mW = 65.6mW

Total Power

(3.465V, with all outputs switching) = 422.7mW + 65.6mW = 488.3mW

_MAX

2. Junction Temperature.

Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the

device. The maximum recommended junction temperature for HiPerClockS devices is 125°C.

The equation for Tj is as follows: Tj = θ_JA* Pd_total + T_A

Tj = Junction Temperature

θ_JA= Junction-to-Ambient Thermal Resistance

Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)

T_A= Ambient Temperature

In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θ_JAmust be used. Assuming a

moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 66.6°C/W per Table 6 below.

Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:

85°C + 0.488W * 66.6°C/W = 117.5°C. This is below the limit of 125°C.

This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,

and the type of board (single layer or multi-layer).

TABLE 6. THERMAL RESISTANCE θ FOR 20-PIN TSSOP, FORCED CONVECTION

θ by Velocity (Linear Feet per Minute)

200

98.0°C/W

66.6°C/W

500

88.0°C/W

63.5°C/W

Single-Layer PCB, JEDEC Standard Test Boards

Multi-Layer PCB, JEDEC Standard Test Boards

114.5°C/W

73.2°C/W

NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.

IDT^™/ ICS^™HSTL FREQUENCY SYNTHESIZER

ICS8421002I REV B MARCH 02, 2009

1...6 7 8910 11 12...15

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与8421002AGI相关器件

型号	品牌	获取价格	描述	数据表
8421002AGI-01	IDT	获取价格	Clock Generator, 170MHz, PDSO20, 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20
8421002AGILFT	IDT	获取价格	Clock Generator, 226.66MHz, PDSO20, 6.50 X 4.40 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153
8421002IAGIT	IDT	获取价格	PLL/Frequency Synthesis Circuit
8421004AGI-01	IDT	获取价格	Clock Generator, 170MHz, PDSO24, 4.40 X 7.80 MM, 0.92 MM HEIGHT, MO-153, TSSOP-24
8421004AGI-01LFT	IDT	获取价格	Clock Generator, 170MHz, PDSO24, 4.40 X 7.80 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, T
8421004AGI-01T	IDT	获取价格	Clock Generator, 170MHz, PDSO24, 4.40 X 7.80 MM, 0.92 MM HEIGHT, MO-153, TSSOP-24
842-1205-C02		获取价格	Kotron? Sentinel Models 822, 832 and 842 RF Point Level Switches
842-1206-G02		获取价格	Kotron? Sentinel Models 822, 832 and 842
8421-51	ASM-SENSOR	获取价格	MEMORY HiLOGGER
8421J80D9ABE	ITT	获取价格	Snap-acting Momentary Pushbutton Switches

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