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8S89834AKILFT

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13©2017 Integrated Device Technology, Inc. September 22, 2017
8S89834I Datasheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pairs.
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
V
CC
– 2V.
• For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 0.80V
(V
CC_MAX
– V
OH_MAX
) = 0.80V
• For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.60V
(V
CC_MAX
– V
OL_MAX
) = 1.60V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
OH_MAX
– (V
CC_MAX
– 2V))/R
L
] * (V
CC_MAX
– V
OH_MAX
) = [(2V – (V
CC_MAX
– V
OH_MAX
))/R
L
] * (V
CC_MAX
– V
OH_MAX
) =
[(2V – 0.80V)/50] * 0.80V = 19.20mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
– 2V))/R
L
] * (V
CC_MAX
– V
OL_MAX
) = [(2V – (V
CC_MAX
– V
OL_MAX
))/R
L
] * (V
CO_MAX
– V
OL_MAX
) =
[(2V – 1.60V)/50] * 1.60V = 12.80mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32mW
Reliability Information
Table 6.
JA
vs. Air Flow Table for a 16 Lead VFQFN
JA
by Velocity
Meters per Second 012.5
Multi-Layer PCB, JEDEC Standard Test Boards 74.7°C/W 65.3°C/W 58.5°C/W
V
OUT
V
CC
V
CC
- 2V
Q1
RL
DISCLAIMER Integrated Device Technology, Inc. (IDT) and its affiliated companies (herein referred to as “IDT”) reserve the right to modify the products and/or specifications described herein at any time, without
notice, at IDT’s sole discretion. Performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed
in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT's products for any
particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual
property rights of IDT or any third parties.
IDT's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably
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Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the property of
IDT or their respective third party owners. For datasheet type definitions and a glossary of common terms, visit www.idt.com/go/glossary. Integrated Device Technology, Inc. All rights reserved.
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14©2017 Integrated Device Technology, Inc. September 22, 2017
8S89834I Datasheet
Transistor Count
The transistor count for 8S89834I is: 351
This device is pin and function compatible and a suggested replacement for 889834.
Package Outline Drawings
The package outline drawings are located in the last section of this document. The package information is the most current data available and
is subject to change without notice or revision of this document.
Ordering Information
Table 8. Ordering Information
Revision History
Part/Order Number Marking Package Shipping Packaging Temperature
8S89834AKILF 834A “Lead-Free” 16 Lead VFQFN Tube -40C to 85C
8S89834AKILFT 834A “Lead-Free” 16 Lead VFQFN Tape & Reel -40C to 85C
Revision Date Description of Change
September 22, 2017
▪ Updated the package outline drawings; however, no mechanical changes
▪ Completed other minor improvements
January 27, 2016 ▪ Removed ICS from part numbers where needed.
▪ General Description - Deleted ICS chip.
▪ Ordering Information - Deleted quantity from tape and reel. Deleted LF note below table.
▪ Updated header and footer.
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8S89834AKILFT

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