ICS851S201I Datasheet, PDF (12/17 Pages) Integrated Device Technology – 2:1 Differential-to-HCSL Multiplexer with Low Input Level Alarm

ICS851S201I Data Sheet
2:1 DIFFERENTIAL-TO-HCSL MULTIPLEXER
3. Calculations and Equations.
The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.
HCSL output driver circuit and termination are shown in Figure 6.
VDD
I_OUT = 17mA
R_REF =
475 ± 1%
V_OUT
R_L
50
IC
Figure 6. HCSL Driver Circuit and Termination
HCSL is a current steering output which sources a maximum of 17mA of current per output. To calculate worst case on-chip power dissipation,
use the following equations which assume a 50 load to ground.
The highest power dissipation occurs when V_DD__MAX.
Power = (V_{DD_MAX} – V_OUT) * I_OUT
since V_OUT = I_OUT * R_L
Power = (V_{DD_MAX} – I_OUT * R_L) * I_OUT
= (3.465V – 17mA * 50) * 17mA
Total Power Dissipation per output pair = 44.5mW
ICS851S201CKI MAY 27, 2017
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