85311AMILF datasheet(13/17 Pages) IDT

tên linh kiện	85311AMILF

Giải thích chi tiết về linh kiện	Low Skew, 1-to-2 , Different ial-to-2.5V, 3.3V LVPECL/ ECL Fanout Buffer

PDF	17 Pages

Scroll/Zoom	100%

nhà sản xuất	IDT [Integrated Device Technology]

Trang chủ	http://www.idt.com

Logo

13 / 17 page

Revision B, February 18, 2016

85311I Datasheet

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

LVPECL output driver circuit and termination are shown in Figure 5.

Figure 5. LVPECL Driver Circuit and Termination

To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of

VCC – 2V.

•

For logic high, VOUT = VOH_MAX = VCC_MAX – 0.9V

(VCC_MAX – VOH_MAX) = 0.9V

•

For logic low, VOUT = VOL_MAX = VCC_MAX – 1.7V

(VCC_MAX – VOL_MAX) = 1.7V

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = [(VOH_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOH_MAX) = [(2V – (VCC_MAX – VOH_MAX))/RL] * (VCC_MAX – VOH_MAX) =

[(2V – 0.9V)/50] * 0.9V = 19.8mW

Pd_L = [(VOL_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOL_MAX) = [(2V – (VCC_MAX – VOL_MAX))/RL] * (VCC_MAX – VOL_MAX) =

[(2V – 1.7V)/50] * 1.7V = 10.2mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW

VOUT

VCC

VCC - 2V

85311AMILF bảng dữ liệu(PDF) 13 Page - Integrated Device Technology