XC6121/XC6122/XC6123/XC6124
Series
■PIN LOGIC CONDITIONS
PIN NAME
LOGIC
H
CONDITIONS
VIN>VDFL+VHYS
PIN NAME LOGIC
CONDITIONS
The state maintaining WD>VWDH
for more than tWD
H
L
VIN
The state maintaining WD<VWDL
for more than tWD
L
VIN<VDFL
WD
H
L
VEN/VENB≧1.30V
VEN/VENB≦0.35V
L→H
H→L
VWDL→VWDH, 300ns≦tWDIN≦tWD
VWDH→VWDL, 300ns≦tWDIN≦tWD
EN/ENB
NOTE:
V
V
V
V
DFL: Detect Voltage
HYS: Hysteresis Range
WDH: WD High Level Voltage
WDL: WD Low Level Voltage
tWDIN: WD Pulse Width
tWD: WD Timeout Period
For the details of each parameter, please see the electrical characteristics.
■FUNCTION CHART
XC6121/XC6122
VEN
XC6123/XC6124
VENB
(*2)
VIN
H
VWD
VRESETB
H
L
Repeating detect and release (H→L→H)
H
L
L
OPEN
L⇔H
H
H
L
H
L
H
L
*1
NOTE:
*1: Including all logics of the WD (VWD=H, L, OPEN, H→L, L→H).
*2: When the VRESETB is High, the circuit is in the release state.
When the VRESETB is Low, the circuit is in the detection state.
*3: VIN=L and VEN/VENB=H can not be combined because the rated input voltage of the EN/ENB pin is Vss-0.3V to VIN+0.3V.
*4: The RESETB pin becomes indefinite operation while 0.35V<VEN/VENB<1.3V.
*5: The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the VEN 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 VENB 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.
13/26
TOREX [ Torex Semiconductor ]
