LTC2938 LINER [Linear Technology], LTC2938 Datasheet - Page 9

• Manufacturer Part Number: LTC2938
• Description: Confi gurable 4- and 6-Supply Monitors with Watchdog Timer
• Manufacturer: LINER [Linear Technology]

TIMING DIAGRAM
WDO
WDI
RST
V
n
POWER-ON RESET
FOLLOWED BY RESET
CAUSED BY
UNDERVOLTAGE EVENT.
WATCHDOG OUTPUT SET
HIGH, WATCHDOG INPUT =
DON’T CARE
t
RST
t
RST
RST
V
n
WATCHDOG INPUT NOT TOGGLED,
WATCHDOG TIMER EXPIRES, WATCHDOG
OUTPUT PULLS LOW. RESET OUTPUT
PULLS LOW FOR ONE RESET TIMEOUT
PERIOD.
WATCHDOG INPUT REMAINS UNTOGGLED,
WATCHDOG OUTPUT REMAINS LOW,
RESET OUTPUT PULLS LOW AGAIN AFTER
ONE WATCHDOG TIMEOUT PERIOD.
WATCHDOG OUTPUT CLEARED BY
UNDERVOLTAGE EVENT.
t
WD
V
RT
t
RST
Reset and Watchdog Timing
t
WD
t
V
UV
n
Monitor Timing
t
RST
t
RST
t
RST
WATCHDOG INPUT NOT
TOGGLED, WATCHDOG
TIMER EXPIRES,
WATCHDOG OUTPUT
PULLS LOW. RESET
OUTPUT PULLS LOW.
WATCHDOG OUTPUT
LOW TIME SHORTENED
BY UNDERVOLTAGE
EVENT DURING RESET
TIMEOUT.
t
WD
t
RST
293839 TD01
LTC2938/LTC2939
WATCHDOG INPUT NOT
TOGGLED, WATCHDOG
TIMER EXPIRES, WATCHDOG
OUTPUT PULLS LOW. RESET
OUTPUT PULLS LOW.
WATCHDOG OUTPUT NOT
CLEARED BY WATCHDOG
INPUT DURING RESET
TIMEOUT. AFTER RESET
COMPLETED, WATCHDOG
INPUT CLEARS WATCHDOG
OUTPUT.
t
WD
t
RST
293839 TD02
293839ff
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