Datasheet > 8N4S270AC-1080CDI

8N4S270AC-1080CDI

更新时间： 2024-01-27 11:07:02

品牌	Logo	应用领域
艾迪悌 - IDT		机械输出元件振荡器
页数	文件大小	规格书
18页	606K
描述
LVDS Output Clock Oscillator

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8N4S270AC-1080CDI 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	Reach Compliance Code：	compliant
风险等级：	5.71	其他特性：	ENABLE/DISABLE FUNCTION; DIFFERENTIAL OUTPUT; TRAY
最长下降时间：	0.45 ns	频率调整-机械：	NO
频率稳定性：	100%	JESD-609代码：	e3
安装特点：	SURFACE MOUNT	标称工作频率：	125 MHz
最高工作温度：	85 °C	最低工作温度：	-40 °C
振荡器类型：	LVDS	物理尺寸：	7.0mm x 5.0mm x 1.55mm
最长上升时间：	0.45 ns	最大供电电压：	3.465 V
最小供电电压：	3.135 V	标称供电电压：	3.3 V
表面贴装：	YES	最大对称度：	53/47 %
端子面层：	Matte Tin (Sn)	Base Number Matches：	1

IDT8N4S270 Data Sheet

LVDS FREQUENCY-PROGRAMMABLE CRYSTAL OSCILLATOR

Power Considerations

This section provides information on power dissipation and junction temperature for the IDT8N4S270. 

Equations and example calculations are also provided.

1. Power Dissipation.

The total power dissipation for the IDT8N4S270 is the sum of the core power plus the power dissipated due to the load. The following is the

power dissipation for V_DD= 3.3V + 5% = 3.465V, which gives worst case results.

•

Power (core)_MAX= V_{DD_MAX}* I_{DD_MAX}= 3.465V * 160mA = 554.4mW

2. Junction Temperature.

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

maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond

wire and bond pad temperature remains below 125°C.

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

Tj = Junction Temperature

_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 _JAmust be used. Assuming no air flow and

a multi-layer board, the appropriate value is 49.4°C/W per Table 6 below.

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

85°C + 0.554W * 49.4°C/W = 112.4°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 (multi-layer).

Table 6. Thermal Resistance _JAfor 6 Lead Ceramic 5mm x 7mm Package, Forced Convection

_JAby Velocity

Meters per Second

Multi-Layer PCB, JEDEC Standard Test Boards

49.4°C/W

44.2°C/W

42.1°C/W

IDT8N4S270CCD REVISION A AUGUST 31, 2012

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