Datasheet

LTC2908
6
2908fd
TYPICAL PERFORMANCE CHARACTERISTICS
Specifi cations are at T
A
= 25°C unless otherwise noted.
V1 (V)
0
RST OUTPUT VOLTAGE (V)
3.0
4.0
5.0
4
2908 G13
2.0
1.0
0
1
2
3
5
V1 = V2 (A1/B1)
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V4 = 1.5V (B1)
V
ADJ1
= V
ADJ2
= V
ADJ3
=
V
ADJ4
= V
ADJ5
= 0.55V
V
RT25
LTC2908-C1
V
RT50
LTC2908-A1
V
RT33
LTC2908-B1
V1 (V)
0
RST OUTPUT VOLTAGE (V)
0.2
V2 = GND
V2 = V1
0.3
0.8
2908 G14
0.1
0
0.2
0.4
0.6
0.4
V3 = V4 = V
ADJ1
=
V
ADJ2
= GND (A1/B1)
V
ADJ1
= V
ADJ2
= V
ADJ3
=
V
ADJ4
= V
ADJ5
= GND (C1)
V1 = INPUT
SUPPLY VOLTAGE, V
CC
(V)
0
RST PULL-DOWN CURRENT, I
RST
(mA)
2
4
1
3
5
6
1234
2908 G15
50
RST AT
150mV
RST AT
50mV
V
CC
= V1 = V2
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V4 = 1.5V (B1)
V
ADJ1
=V
ADJ2
= 0.55V
V
RT33
LTC2908-B1
V
RT50
LTC2908-A1
SUPPLY VOLTAGE V
CC
(V)
0
1.5
2.0
2.5
1.5
2.5
2928 G25
1.0
0.5
0
0.5 1.0 2.0
3.0
3.5
4.0
RST PULL-DOWN CURRENT, I
RST
(mA)
V
CC
= V1
V
ADJ1
=V
ADJ2
=V
ADJ3
=
V
ADJ4
=V
ADJ5
= 0.55V
V
RT25
LTC2908-C1
RST AT 150mV
RST AT 50mV
SUPPLY VOLTAGE, V
CC
(V)
0.01
RST PULL-DOWN CURRENT, I
RST
(mA)
0.1
1
10
0 0.4 0.6 0.8
0.001
0.2
1
2908 G16
V
CC
= V1 = V2
V3 = V4 = V
ADJ1
= V
ADJ2
= GND
RST AT 150mV
RST AT 50mV
SUPPLY VOLTAGE, V
CC
(V)
0.01
RST PULL-DOWN CURRENT, I
RST
(mA)
0.1
1
10
0 0.4 0.6 0.8
0.001
0.2
1
2908 G17
V
CC
= V1
V2 = V3 = V4 = V
ADJ1
= V
ADJ2
=
V
ADJ3
= V
ADJ4
= V
ADJ5
= GND
RST AT 150mV
RST AT 50mV
RST PULL-DOWN CURRENT, I
RST
(mA)
0
RST OUTPUT VOLTAGE LOW, V
OL
(V)
0.7
15
2908 G18
0.4
0.2
510 20
0.1
0
0.8
0.6
0.5
0.3
25 30 35
V1 = 5.0V
V2 = 3.3V
V3 = 2.5V
V4 = 1.8V
V
ADJ1
= V
ADJ2
= 0.4V
85°C –40°C
25°C
RST PULL-DOWN CURRENT, I
RST
(mA)
0
RST OUTPUT VOLTAGE LOW, V
OL
(V)
0.7
15
2908 G19
0.4
0.2
510 20
0.1
0
0.8
0.6
0.5
0.3
25
V1 = 3.3V
V2 = 2.5V
V3 = 1.8V
V4 = 1.5V
V
ADJ1
= V
ADJ2
= 0.4V
85°C –40°C
25°C
25°C
RST PULL-DOWN CURRENT, I
RST
(mA)
0.0
0.00
RST OUTPUT VOLTAGE LOW, V
OL
(V)
0.20
0.40
0.60
0.80
1.0
1.20
5.0 10.0 15.0 20.0
2908 G23
25.0
V1 = 2.5V
V
ADJ1
= V
ADJ2
= V
ADJ3
=
V
ADJ4
= V
ADJ5
= 0.4V
85°C
–40°C
RST Output Voltage vs V1 with
10k Pull-Up Resistor to V1
RST Output Voltage vs V1 with
10k Pull-Up Resistor to V1
RST Pull-Down Current vs
Supply Voltage
LTC2908-A1/LTC2908-B1
RST Pull-Down Current vs
Supply Voltage with 1 Input
RST Pull-Down Current vs
Supply Voltage
LTC2908-C1
RST Pull-Down Current vs
Supply Voltage with 2 Inputs
LTC2908-A1/LTC29089-B1
RST Output Voltage Low vs
RST Pull-Down Current
LTC2908-A1
RST Output Voltage Low vs
RST Pull-Down Current
LTC2908-B1
RST Output Voltage Low vs
RST Pull-Down Current
LTC2908-C1