LTC693 LINER [Linear Technology], LTC693 Datasheet - Page 7

• Manufacturer Part Number: LTC693
• Description: Microprocessor Supervisory Circuits
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
OSC IN: Oscillator Input. OSC IN can be driven by an
external clock signal or an external capacitor can be
connected between OSC IN and GND when OSC SEL is
forced low. In this configuration the nominal reset active
time and watchdog time-out period are determined by
the number of clocks or set by the formula (see
BLOCK
U
U
I D AGRA
OSC SEL
OSC IN
V BATT
CE IN
WDI
V CC
PFI
U
W
TRANSITION
DETECTOR
1.3V
GND
OSC
+
–
+
–
+
–
C1
C2
C3
M2
RESET PULSE
GENERATOR
WATCHDOG
TIMER
Applications Information section). When OSC SEL is
high or floating, the internal oscillator is enabled and the
reset active time is fixed at 200ms typical. OSC IN selects
between the 1.6 seconds and 100ms typical watchdog
time-out periods. In both cases the time-out period
immediately after a reset is 1.6 seconds typical.
CHARGE
PUMP
M1
LTC692/LTC693
LTC692/3 • BD
BATT ON
CE OUT
LOW LINE
PFO
RESET
RESET
WDO
V OUT
7