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XC6121/XC6122/XC6123/XC6124

Series

PIN NAME

LOGIC

CONDITIONS

PIN NAME

LOGIC

CONDITIONS

H

H

L

L

H

EN/ENB>1.30V

L→H

EN/ENB

L

EN/ENB<0.35V

WD

H→L

XC6121/XC6122

XC6123/XC6124

EN

ENB

WD

RESETB (*2)

H

L

OPEN

Repeating detect and release (H→L→H)

H

H

L

L⇔H

H

H

H

H

L

L

L

*1

L

■PIN LOGIC CONDITIONS

NOTE:

For the details of each parameter, please see the electrical characteristics.

■FUNCTION CHART

NOTE:

*1: Including all logics of the WD (WD=H, L, OPEN, H→L, L→H).

*2: When the RESETB is High, the circuit is in the release state.

When the RESETB is Low, the circuit is in the detection state.

*4: The RESETB pin becomes indefinite operation while 0.35V<EN/ENB<1.3V.

*5:

The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the

EN pin in high level. The EN pin of the XC6122 series is internally pulled up. The watchdog function can be

used even the EN pin left open. The ENB pin of the XC6123 series is not internally pulled down. When using

the watchdog function, please drive the ENB pin in low level. The ENB pin of the XC6124 series is internally

pulled up. The watchdog function can be used even the ENB pin left open.