LTC695ISW#PBF Linear Technology, LTC695ISW#PBF Datasheet - Page 14
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LTC695ISW#PBF
Manufacturer Part Number
LTC695ISW#PBF
Description
IC MPU SUPERVISRY CIRCUIT 16SOIC
Manufacturer
Linear Technology
Type
Simple Reset/Power-On Resetr
Datasheet
1.LTC690CN8PBF.pdf
(18 pages)
Specifications of LTC695ISW#PBF
Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.65V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LTC690/LTC691
LTC694/LTC695
APPLICATIONS INFORMATION
The LTC691 and LTC695 provide an additional output
(Watchdog Output, WDO) which goes low if the watchdog
timer is allowed to time out and remains low until set high
when V
The LTC691 and LTC695 have two additonal pins OSC SEL
and OSC IN, which allow reset active time and watchdog
timeout period to be adjusted per Table 2. Several
configurations are shown in Figure 12.
OSC IN can be driven by an external clock signal or an
external capacitor can be connected between OSC IN and
14
by the next transition on the WDI pin. WDO is also set high
CC
falls below the reset voltage threshold or V
RESET
WDO
V
WDI
CC
= 5V
5V
5V
4
4
3
3
1.6 SECOND WATCHDOG
INTERNAL OSCILLATOR
GND
GND
V
V
EXTERNAL CLOCK
CC
CC
LTC691
LTC695
LTC691
LTC695
t
1
Figure 11. Watchdog Timeout Period and Reset Active Time
OSC SEL
OSC SEL
OSC IN
OSC IN
7
8
8
7
Figure 12. Oscillator Configurations
t
FLOATING
OR HIGH
FLOATING
OR HIGH
2
BATT
t
1
t
t
t
.
1
2
3
= RESET ACTIVE TIME
= NORMAL WATCHDOG TIME-OUT PERIOD
= WATCHDOG TIME-OUT PERIOD IMMEDIATELY
AFTER A RESET
GND when OSC SEL is forced low. In these configurations,
the nominal reset active time and watchdog timeout
period are determined by the number of clocks or set by
the formula in Table 2. When OSC SEL is high or floating,
the internal oscillator is enabled and the reset active time
is fixed at 35ms minimum for the LTC691 and 140ms
minimum for the LTC695. OSC IN selectes between the
1 second and 70ms minimum normal watchdog timeout
periods. In both cases, the timeout period immediately
after a reset is at least 1 second.
5V
5V
t
3
4
3
4
3
EXTERNAL OSCILLATOR
INTERNAL OSCILLATOR
GND
100ms WATCHDOG
V
V
GND
CC
CC
LTC691
LTC695
LTC691
LTC695
OSC SEL
OSC SEL
OSC IN
OSC IN
8
7
8
7
FLOATING
OR HIGH
690 F12
690 F11
690fe