ZL40262

DS20006843A-page 12

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2024 Microchip Technology Inc. and its subsidiaries.

2.3

Termination of Unused Inputs and Outputs

Unused outputs should be left unconnected.

2.4

Power Consumption

The device total power consumption can be calculated as:

EQUATION 2-1:

Where:

Power dissipated inside the device can be calculated by subtracting power dissipated in termination/biasing resistors

from the power consumption:

EQUATION 2-2:

Where:

2.5

Power Supply Filtering

Each power pin (VDD and VDDO) should be decoupled with 0.1 µF capacitor with minimum equivalent series resistance

(ESR) and minimum series inductance (ESL). For example, 0402 X5R Ceramic Capacitors with 6.3V minimum rating

could be used. These capacitors should be placed as close as possible to the power pins. To reduce the power noise

from adjacent digital components on the board, each power supply could optionally be further insulated with low resis-

tance ferrite bead with 10 µF and 1 µF capacitors. Figure 2-8 shows the standard and optional decoupling method.

PS = VDD × IS

Core power consumed by the input buffer. The static cur-

rent (IS) is specified in Table 4.

PC = VDDO × IDD_CM

Common output power shared between two outputs. The

current IDD_CM is specified in Table 4.

PO_DIF = VDDO × IDD_HCSL × N

Output power where output current per output

(IDD_HCSL) is specified in Table 4.

N is number of enabled outputs.

PHCSL = (VSW / 50Ω)2 x (50Ω + 33Ω)

VSW is voltage swing of HCSL output. 50Ω is termination

resistance and 33Ω is series resistance of the HCSL out-

put.

PT PS PC PO_DIFF

+

+

=

PD PT N PHCSL



–

=