Si8440/41/42/45

20

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Table 13. Enable Input Truth Table1

P/N

EN11,2 EN21,2

Operation

Si8440

—

H

Outputs B1, B2, B3, B4 are enabled and follow the input state.

—

L

Outputs B1, B2, B3, B4 are disabled and Logic Low or in high impedance state.3

Si8441

H

X

Output A4 enabled and follows the input state.

L

X

Output A4 disabled and Logic Low or in high impedance state.3

X

H

Outputs B1, B2, B3 are enabled and follow the input state.

X

L

Outputs B1, B2, B3 are disabled and Logic Low or in high impedance state.3

Si8442

H

X

Outputs A3 and A4 are enabled and follow the input state.

L

X

Outputs A3 and A4 are disabled and Logic Low or in high impedance state.3

X

H

Outputs B1 and B2 are enabled and follow the input state.

X

L

Outputs B1 and B2 are disabled and Logic Low or in high impedance state.3

Si8445

—

—

Outputs B1, B2, B3, B4 are enabled and follow the input state.

Notes:

1. Enable inputs EN1 and EN2 can be used for multiplexing, for clock sync, or other output control. EN1, EN2 logic

operation is summarized for each isolator product in Table 13. These inputs are internally pulled-up to local VDD by a

3 µA current source allowing them to be connected to an external logic level (high or low) or left floating. To minimize

noise coupling, do not connect circuit traces to EN1 or EN2 if they are left floating. If EN1, EN2 are unused, it is

recommended they be connected to an external logic level, especially if the Si84xx is operating in a noisy environment.

2. X = not applicable; H = Logic High; L = Logic Low.

3. When using the enable pin (EN) function, the output pin state is driven to a logic low state when the EN pin is disabled

(EN = 0) in Revision C. Revision D outputs go into a high-impedance state when the EN pin is disabled (EN = 0). See

"3. Errata and Design Migration Guidelines" on page 24 for more details.