Datasheet

LTC690/LTC691
LTC694/LTC695
8
690ff
For more information www.linear.com/690
Typical perForMance characTerisTics
Reset Active Time
vs Temperature LTC690-1
Reset Active Time
vs Temperature LTC694-5
Reset Voltage Threshold
vs Temperature
Power-Fail Comparator
Response Time
Power-Fail Comparator
Response Time
Power-Fail Comparator Response
Time with Pull-Up Resistor
V
OUT
vs I
OUT
V
OUT
vs I
OUT
Power Failure Input Threshold
vs Temperature
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
4.90
4.95
5.00
40
690 G01
4.85
4.80
4.75
10
20
30
50
SLOPE = 5Ω
V
CC
= 5V
V
BATT
= 2.8V
T
A
= 25°C
LOAD CURRENT (µA)
0
OUTPUT VOLTAGE (V)
2.76
2.78
400
690 G02
2.74
2.72
100
200
300
500
2.80
V
CC
= 0V
V
BATT
= 2.8V
T
A
= 25°C
SLOPE = 125Ω
TEMPERATURE (°C)
–50
PFI INPUT THRESHOLD (V)
1.304
1.306
1.308
25 75
690 G03
1.302
1.300
–25 0
50 100 125
1.298
1.296
1.294
V
CC
= 5V
TEMPERATURE (°C)
–50
RESET ACTIVE TIME
54
56
58
25 75
690 G04
52
50
–25 0
50 100 125
48
46
V
CC
= 5V
TEMPERATURE (°C)
–50
RESET ACTIVE TIME
216
224
232
25 75
690 G05
208
200
–25 0
50 100 125
192
184
V
CC
= 5V
TEMPERATURE (°C)
–50
RESET VOLTAGE THRESHOLD (V)
4.64
4.65
4.66
25 75
690 G06
4.63
4.62
–25 0
50 100 125
4.61
4.60
TIME (µs)
0
4
5
6
4
690 G07
3
2
0
1 2 3
5
1
1.305V
1.285V
87
6
V
CC
= 5V
T
A
= 25°C
+
–
V
PFI
1.3V
PFO
30pF
V
PFI
= 20mV STEP
PFO OUTPUT VOLTAGE (V)
TIME (µs)
0
4
5
6
40
690 G08
3
2
0
20
60
1
1.315V
1.295V
120
10080
V
PFI
= 20mV STEP
180160
140
V
CC
= 5V
T
A
= 25°C
+
–
V
PFI
1.3V
PFO
30pF
PFO OUTPUT VOLTAGE (V)
TIME (µs)
0
4
5
6
4
690 G09
3
2
0
2
6
1
1.315V
1.295V
12
108
V
PFI
= 20mV STEP
1816
14
V
CC
= 5V
T
A
= 25˚C
+
–
V
PFI
1.3V
PFO
30pF
10k
5V
PFO OUTPUT VOLTAGE (V)