Table 3.2. Enable Input Truth

Part Number

EN11, 2

EN21, 2

Operation

Si8630

—

H

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

—

L

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

Si8631

H

X

Output A3 enabled and follows the input state.

L

X

Output A3 disabled and in high impedance state.3

X

H

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

X

L

Outputs B1, B2 are disabled and in high impedance state.3

Si8635

—

—

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

Note:

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

pulled-up to local VDD 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 Si86xx 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 into a high-impedance state when the EN pin is disabled

(EN = 0).

Si8630/31/35 Data Sheet

Device Operation

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