Datasheet
LTC694-3.3/LTC695-3.3
4
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ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, V
BATT
= 2V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Back-Up Switching
Operating Voltage Range V
CC
V
BATT
l
l
3.0
1.5
5.50
2.75
V
V
V
OUT
Output Voltage I
OUT
= 1mA
l
V
CC
– 0.1
V
CC
– 0.2
V
CC
– 0.01
V
CC
– 0.01
V
V
I
OUT
= 50mA
l
V
CC
– 0.8 V
CC
– 0.4 V
V
OUT
in Battery Back-Up Mode I
OUT
= 250µA, V
CC
< V
BATT
l
V
BATT
– 0.1 V
BATT
– 0.02 V
Supply Current (Exclude I
OUT
)I
OUT
≤ 50µA, V
CC
= 3.6V
l
0.2
0.2
0.6
1.0
mA
mA
Supply Current in Battery Back-Up Mode V
CC
= 0V, V
BATT
= 2V
l
0.04
0.04
1
5
µA
µA
Battery Standby Current (+ = Discharge, – = Charge) 3.6V > V
CC
> V
BATT
+ 0.2V
l
–0.02
–0.10
0.02
0.10
µA
µA
Battery Switchover Threshold (V
CC
– V
BATT
) Power-Up
Power-Down
70
50
mV
mV
Battery Switchover Hysteresis 20 mV
BATT ON Output Voltage (Note 4) I
SINK
= 800µA
l
0.3 V
BATT ON Output Short-Circuit Current (Note 4) BATT ON = V
OUT
, Sink Current
BATT ON = 0V, Source Current
l 0.5
25
125
mA
µA
Reset and Watchdog Timer
Reset Voltage Threshold
l
2.8 2.9 3.0 V
Reset Threshold Hysteresis 40 mV
Reset Active Time OSC SEL HIGH, V
CC
= 3V
l
160
140
200
200
240
280
ms
ms
Watchdog Timeout Period, Internal Oscillator Long Period, V
CC
= 3V
l
1.2
1.0
1.6
1.6
2.0
2.25
sec
sec
Short Period, V
CC
= 3V
l
80
70
100
100
120
140
ms
ms
Watchdog Timeout Period, External Clock (Note 5) Long Period, V
CC
= 3V
Short Period, V
CC
= 3V
l
l
4032
960
4097
1025
Clock
Cycles
Reset Active Time PSRR 4 ms/V
Watchdog Timeout Period PSRR, Internal OSC Short Period
Long Period
2
32
ms/V
ms/V
Minimum WDI Input Pulse Width V
IL
= 0.4V, V
IH
= 3V
l
200 ns
RESET Output Voltage at V
CC
= 1V I
SINK
= 10µA, V
CC
= 1V
l
4 200 mV
RESET and LOW
_
LINE Output Voltage (Note 4) I
SINK
= 400µA, V
CC
= 2.8V
I
SOURCE
= 0.1µA, V
CC
= 3V
l
l
2.3
0.3 V
V
RESET and WDO Output Voltage (Note 4) I
SINK
= 400µA, V
CC
= 3V
I
SOURCE
= 0.1µA, V
CC
= 2.8V
l
l
2.3
0.3 V
V
RESET, RESET, WDO, LOW
_
LINE
Output Short-Circuit Current (Note 4)
Output Source Current
Output Sink Current
l
13
9
25 µA
mA
WDI Input Threshold Logic Low
Logic High
l
l
2.3
0.4 V
V
WDI Input Current WDI = V
OUT
WDI = 0V
l
l
–50
4
–8
50 µA
µA