Datasheet

LTC6991
6
6991fb
Supply Current vs R
SET
RST Threshold Voltage
vs Supply VoltageTypical I
SET
Current Limit vs V
+
Supply Current vs Supply Voltage Supply Current vs Temperature
Supply Current
vs RST Pin Voltage
Reset Propagation Delay (t
RST
)
vs Supply Voltage
Rise and Fall Time
vs Supply Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
V
+
= 3.3V, R
SET
= 200k, T
A
= 25°C unless otherwise noted.
SUPPLY VOLTAGE (V)
2
0
POWER SUPPLY CURRENT (µA)
25
50
75
100
125
150
34 56
6991 G10
R
SET
= 50k
R
SET
= 100k
R
SET
= 200k
R
SET
= 800k
TEMPERATURE (°C)
–50
POWER SUPPLY CURRENT (µA)
100
125
150
25 75
6991 G11
75
50
–25 0
50 100 125
25
0
5V, R
SET
= 100k
2.5V, R
SET
= 100k
2.5V, R
SET
= 800k
5V, R
SET
= 800k
V
RST
/V
+
(V/V)
0
POWER SUPPLY CURRENT (µA)
150
200
250
0.8
6991 G12
100
50
0
0.2
0.4
0.6
1.0
5V
RST FALLING
5V
RST RISING
3.3V
RST FALLING
3.3V
RST RISING
R
SET
= 800k
R
SET
(k)
0
0
POWER SUPPLY CURRENT (µA)
25
50
75
100
125
150
200 400 600 800
6991 G13
V
+
= 5V
V
+
= 3.3V
V
+
= 2.5V
SUPPLY VOLTAGE (V)
I
SET
(µA)
6991 G15
1000
400
800
200
600
0
24356
SET PIN SHORTED TO GND
SUPPLY VOLTAGE (V)
RST PIN VOLTAGE (V)
6991 G14
3.5
1.0
2.0
3.0
0.5
1.5
2.5
0
24356
POSITIVE-GOING
NEGATIVE-GOING
SUPPLY VOLTAGE (V)
2
0
PROPAGATION DELAY (ns)
5
15
20
25
50
35
3
4
6991 G16
10
40
45
30
5
6
C
LOAD
= 5pF
SUPPLY VOLTAGE (V)
RISE/FALL TIME (ns)
6991 G17
3.0
1.5
2.5
1.0
0.5
2.0
0
24356
C
LOAD
= 5pF
t
RISE
t
FALL
Typical Frequency Error
vs Time (Long-Term Drift)
TIME (h)
DELTA FREQUENCY (ppm)
6991 G17a
50
0
150
–150
–100
–50
100
200
–200
0 1200400 800 1600 2000 2400 2800
65 UNITS
SOT-23 AND DFN PARTS
T
A
= 30°C