LTC695-3.3 LINER [Linear Technology], LTC695-3.3 Datasheet - Page 7

• Manufacturer Part Number: LTC695-3.3
• Description: 3.3V 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 Applications
BLOCK
U
U
I D AGRA
OSC SEL
U
OSC IN
V BATT
CE IN
V CC
WDI
PFI
W
TRANSITION
DETECTOR
1.3V
GND
OSC
+
–
–
+
–
+
C1
C2
C3
M2
RESET PULSE
GENERATOR
WATCHDOG
TIMER
Information section). When OSC SEL is high or floating,
the internal oscillator is enabled and the reset active time
is fixed at 200ms typical for the LTC695-3.3. 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
LTC694-3.3/LTC695-3.3
BATT ON
CE OUT
LOW LINE
PFO
RESET
RESET
WDO
694/5-3.3 BD
V OUT
7