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XC6121/XC6122/XC6123/XC6124
Series
PIN NAME LOGIC CONDITIONS PIN NAME LOGIC CONDITIONS
V
IN
H V
IN
>V
DFL
+V
HYS
WD
H
The state maintaining WD>V
WDH
for more than t
WD
L V
IN
<V
DFL
L
The state maintaining WD<V
WDL
for more than t
WD
EN/ENB
H
V
EN
/V
ENB
≧1.30V L→H V
WDL
→V
WDH
, 300ns≦t
WDIN
≦t
WD
L
V
EN
/V
ENB
≦0.35V H→L V
WDH
→V
WDL
, 300ns≦t
WDIN
≦t
WD
VIN
XC6121/XC6122 XC6123/XC6124
V
WD
V
RESETB
(*2)
V
EN
V
ENB
H H L
H
Repeating detect and release (H→L→H)
L
OPEN
L⇔H
H
H
L
H
*1
H
L
L L
■PIN LOGIC CONDITIONS
NOTE:
V
DFL
: Detect Voltage
V
HYS
: Hysteresis Range
V
WDH
: WD High Level Voltage
V
WDL
: WD Low Level Voltage
t
WDIN
: WD Pulse Width
t
WD
: WD Timeout Period
For the details of each parameter, please see the electrical characteristics.
■FUNCTION CHART
NOTE:
*1: Including all logics of the WD (V
WD
=H, L, OPEN, H→L, L→H).
*2: When the V
RESETB
is High, the circuit is in the release state.
When the V
RESETB
is Low, the circuit is in the detection state.
*3: V
IN
=L and V
EN
/V
ENB
=H can not be combined because the rated input voltage of the EN/ENB pin is Vss-0.3V to V
IN
+0.3V.
*4: The RESETB pin becomes indefinite operation while 0.35V<V
EN
/V
ENB
<1.3V.
*5: The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the V
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 V
ENB
pin in
low level. The ENB pin of the XC6124 series is internally pulled down. The watchdog function can be used even the ENB pin
left open.
