ADuM1241ARSZ datasheet(13/24 Pages) AD

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Data Sheet

ADuM1240/ADuM1241/ADuM1245/ADuM1246

TRUTH TABLES

Table 22 provides the truth table (positive logic) for the

ADuM1240 and the ADuM1241, and Table 23 provides the

truth table (positive logic) for the ADuM1245 and the

ADuM1246. For a description of the abbreviations used in the

truth tables, see Table 21.

Table 21. Truth Table Abbreviations

Letter

Description

High level

Low level

↑

Rising data transition

↓

Falling data transition

Irrelevant

Level of VOX prior to levels being established

High impedance

Table 22. ADuM1240/ADuM1241 Truth Table (Positive Logic)1, 2, 3

VIx Input

VDDI State

VDDO State

ENx

State

VOx Output

Description

Powered

Normal operation; data is high and refresh is enabled.

Powered

Normal operation; data is low and refresh is enabled.

Unpowered

Powered

Input unpowered. Outputs are in the default high state. Outputs return to

the input state within 150 µs of VDDI power restoration. See the pin function

descriptions (Table 19 and Table 20) for details.

Unpowered

Powered

Input unpowered. Outputs are static at the level that was last sent from

the input or at the power-up level. See the pin function descriptions (Table 19

and Table 20) for details.

↑

Powered

Output is high after propagation delay, refresh is disabled.

↓

Powered

Output is low after propagation delay, refresh is disabled.

Powered

Unpowered

Output unpowered. Output pins are in high impedance state. Outputs

return to the input state within 150 µs of VDDO power restoration. See the

pin function descriptions (Table 19 and Table 20) for details.

VIx and VOx refer to the input and output signals of a given channel (A, B, C, or D).

VDDI refers to the power supply on the input side of a given channel (A, B, C, or D).

VDDO refers to the power supply on the output side of a given channel (A, B, C, or D).

Table 23. ADuM1245/ADuM1246 Truth Table (Positive Logic)1, 2, 3

VIx Input

VDDI State

VDDO State

ENx State

VOx Output

Description

Powered

Normal operation; data is high and refresh is enabled.

Powered

Normal operation; data is low and refresh is enabled.

Unpowered

Powered

Input unpowered. Outputs are in the default low state. Outputs

return to the input state within 150 µs of VDDI power restoration. See

the pin function descriptions (Table 19 and Table 20) for details.

Unpowered

Powered

Input unpowered. Outputs are static at the level that was last sent

from the input or at the power-up level. See the pin function

descriptions (Table 19 and Table 20) for details.

↑

Powered

Output is high, refresh is disabled.

↓

Powered

Output is low, refresh is disabled.

Powered

Unpowered

Output unpowered. Output pins are in high impedance state.

Outputs return to input state within 150 µs of VDDO power restoration.

See the pin function descriptions (Table 19 and Table 20) for details.

VIx and VOx refer to the input and output signals of a given channel (A, B, C, or D).

VDDI refers to the power supply on the input side of a given channel (A, B, C, or D).

VDDO refers to the power supply on the output side of a given channel (A, B, C, or D).

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