LOW S
參數(shù)資料
型號: ICS85314BGI-01LF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 5/20頁
文件大?。?/td> 0K
描述: IC CLOCK BUFFER MUX 2:5 20-TSSOP
標(biāo)準(zhǔn)包裝: 74
系列: HiPerClockS™
類型: 扇出緩沖器(分配),多路復(fù)用器
電路數(shù): 1
比率 - 輸入:輸出: 2:5
差分 - 輸入:輸出: 是/是
輸入: HCSL,LVCMOS,LVDS,LVHSTL,LVPECL,LVTTL,SSTL
輸出: LVPECL
頻率 - 最大: 700MHz
電源電壓: 2.375 V ~ 3.8 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 20-TSSOP
包裝: 管件
產(chǎn)品目錄頁面: 1250 (CN2011-ZH PDF)
其它名稱: 800-1167
800-1167-5
800-1167-ND
85314BGI-01LF
85314BGI-01
www.idt.com
REV. F JULY 25, 2010
13
ICS85314I-01
LOW SKEW, 1-TO-5
DIFFERENTIAL-TO-2.5V/3.3V LVPECL FANOUT BUFFER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS85314I-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS85314I-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC = 3.8V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX = VCC_MAX * IEE_MAX = 3.8V * 80mA = 304mW
Power (outputs)
MAX = 30.2mW/Loaded Output pair
If all outputs are loaded, the total power is 5 * 30.2mW = 151mW
Total Power
_MAX (3.465V, with all outputs switching) = 304mW + 151mW = 455mW
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 the devices is 125°C.
The equation for Tj is as follows: Tj =
θ
JA * Pd_total + TA
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
JA must 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 6A below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.455W * 66.6°C/W = 115°C. This is well 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).
θθθθθ
JA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
114.5°C/W
98.0°C/W
88.0°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
73.2°C/W
66.6°C/W
63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 6A. THERMAL RESISTANCE
θθθθθ
JA
FOR
20-PIN TSSOP, FORCED CONVECTION
θθθθθ
JA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
83.2°C/W
65.7°C/W
57.5°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
46.2°C/W
39.7°C/W
36.8°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 6B. THERMAL RESISTANCE
θθθθθ
JA
FOR
20-PIN SOIC, FORCED CONVECTION
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