3
LTC2903-1
29031f a
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
V1
V1 Input Current (Note 4) V1 = 3.3V (LTC2903-A1, LTC2903-D1) ● 20 80 µA
V1 = 5V (LTC2903-B1, LTC2903-C1,
● 25 80 µA
LTC2903-E1)
I
V2
V2 Input Current (Note 4) V2 = 2.5V (LTC2903-A1) ● 830 µA
V2 = 3.3V (LTC2903-B1, LTC2903-C1)
● 10 30 µA
V2 = 0.55V (LTC2903-D1, LTC2903-E1)
● ±30 nA
I
V3
V3 Input Current V3 = 1.8V (LTC2903-A1, LTC2903-C1) ● 830 µA
V3 = 2.5V (LTC2903-B1)
● 10 30 µA
V3 = 0.55V (LTC2903-D1, LTC2903-E1)
● ±30 nA
I
V4
V4 Input Current V4 = 0.55V (LTC2903-A1) ● ±30 nA
V4 = 1.8V (LTC2903-B1)
● 24 µA
V4 = –5.2V (LTC2903-C1)
● –3 –6 µA
V4 = 0.55V (LTC2903-D1, LTC2903-E1)
● ±30 nA
t
RST
Reset Time-Out Period ● 140 200 260 ms
t
UV
V
X
Undervoltage Detect to RST V
X
Less Than Threshold V
RTX
by 150 µs
More Than 1%
V
OH
Output Voltage High RST (LTC2903-1) (Note 5) I
RST(DN)
= –1µA (LTC2903-A1, ● V2 – 1 V
LTC2903-B1, LTC2903-C1)
(LTC2903-D1, LTC2903-E1) ● V1 – 1 V
V
OL
Output Voltage Low RST (Note 6) V
CC
= 0.2V, I
RST
= 0.1µA ● 560 mV
V
CC
= 0.5V, I
RST
= 5µA ● 10 150 mV
V
CC
= 1V, I
RST
= 200µA ● 25 300 mV
V
CC
= 3V, I
RST
= 2500µA ● 100 300 mV
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 3.3V unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All currents into pins are positive, all voltages are referenced to
GND unless otherwise noted.
Note 3: The internal supply voltage (V
CC
) is generated from the greater
voltage on the V1 and V2 inputs. V
CC
= V1 for options D1 and E1.
Note 4: Under typical operating conditions, quiescent current is drawn
from the V1 input. When V2 exceeds V1, V2 supplies the quiescent
current. V1 only for options D1 and E1.
Note 5: The RST output pin on the LTC2903-1 has an internal pull-up to
V2 (for options A1, B1 and C1) of typically 10µA. However, for faster rise
times or for V
OH
voltages greater than V2, use an external pull-up resistor.
The internal pull-up is connected to V1 for options D1 and E1.
Note 6: For options A1, B1 and C1, the RST pulldown current is derived
from V1, V2 and V3. For options D1 and E1, pulldown strength is derived
from V1.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT33
3.3V, 5% Reset Threshold V1 Input Threshold ● 3.036 3.086 3.135 V
V
RTAV2
V2 Adjustable Threshold V2 Input Threshold ● 0.492 0.500 0.508 V
V
RTAV3
V3 Adjustable Threshold V3 Input Threshold ● 0.492 0.500 0.508 V
V
RTAV4
V4 Adjustable Threshold V4 Input Threshold ● 0.492 0.500 0.508 V
(LTC2903-D1) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT50
5V, 5% Reset Threshold V1 Input Threshold ● 4.600 4.675 4.750 V
V
RTAV2
V2 Adjustable Threshold V2 Input Threshold ● 0.492 0.500 0.508 V
V
RTAV3
V3 Adjustable Threshold V3 Input Threshold ● 0.492 0.500 0.508 V
V
RTAV4
V4 Adjustable Threshold V4 Input Threshold ● 0.492 0.500 0.508 V
(LTC2903-E1) The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at
T
A
= 25°C. V
CC
= 5V unless otherwise noted.
