Datasheet

LTC2915/LTC2916
4
29156fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reset Timer Control (RT)
I
RT(UP)
RT Pull-Up Current V
RT
= 0.25V
l
–2 –3 –4 μA
I
RT(DOWN)
RT Pull-Down Current V
RT
= 1.1V
l
234 μA
I
RT(INT)
Internal RT V
CC
Detect Current V
RT
= V
CC
l
18 μA
V
RT(INT,LH)
RT Internal Timer Threshold V
RT
Rising, Referenced to V
CC
l
–100 –160 –300 mV
Reset Output (RST)
t
RST(INT)
Internal Reset Timeout Period V
RT
= V
CC
l
150 200 260 ms
t
RST(EXT)
Adjustable Reset Timeout Period C
RT
= 2.2nF
l
16 20 25 ms
t
UV
VM Undervoltage Detect to RST
Asserted
VM Less Than Reset Threshold
V
MTX
by More Than 5%
l
10 80 150 μs
V
OL
Output Voltage Low RST V
CC
= 3.3V, I
RST
= 2.5mA
V
CC
= 1V, I
RST
= 100μA
V
CC
= 0.8V, I
RST
= 15μA
l
l
l
0.15
0.15
0.05
0.4
0.3
0.2
V
V
V
I
OH(RST)
RST Output Voltage High Leakage RST = V
CC
l
±1 μA
Manual Reset Input (LTC2916)
V
IL
Input Low Voltage
l
0.2 • V
CC
V
V
IH
Input High Voltage
l
0.8 • V
CC
V
R
PU
Pull Up Resistance
l
50 100 150
kΩ
t
PW
Pulsewidth
l
250 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 2.5V, unless otherwise noted. (Note 2)
Note 3: V
CC
maximum pin voltage is limited by input current. Since the
V
CC
pin has an internal 6.2V shunt regulator, a low impedance supply
which exceeds 5.7V may exceed the rated terminal current. Operation
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Input impedance is dependent on the confi guration of the SEL
pins.
TIMING DIAGRAM
Monitor Input Timing
VM
RST
V
MTx
1V
t
UV
t
RST
29156 TD01