LTC2903 LINER [Linear Technology], LTC2903 Datasheet - Page 5

• Manufacturer Part Number: LTC2903
• Description: Low Voltage Supervisorwith 27 Selectable Thresholds and Watchdog Timer
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
SYMBOL
Reset Output ( ⎯ R ⎯ S ⎯ T )
t
t
t
V
I
Watchdog Timer Control (WT)
I
I
V
I
I
Watchdog Input (WDI)
t
t
t
t
V
V
t
Manual Reset Input (LTC2918)
V
V
R
t
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.
Note 3: V
V
which exceeds 5.7V may exceed the rated terminal current. Operation
temperature range, otherwise specifi cations are at T
RST(INT)
RST(EXT)
UV
OH(RST)
WT(UP)
WT(DOWN)
WT(INT)
WT(DIS)
WDU(INT)
WDL(INT)
WDU(EXT)
WDL(EXT)
PW(WDI)
PW(MR)
OL
WT(INT, LH)
IL(WDI)
IH(WDI)
IL(MR)
IH(MR)
PU
CC
pin has an internal 6.2V shunt regulator, a low impedance supply
CC
maximum pin voltage is limited by input current. Since the
PARAMETER
Internal Reset Timeout Period
Adjustable Reset Timeout Period
VM Undervoltage Detect to ⎯ R ⎯ S ⎯ T
Asserted
Output Voltage Low ⎯ R ⎯ S ⎯ T
⎯ R ⎯ S ⎯ T Output Voltage High Leakage
WT Pull Up Current
WT Pull Down Current
WT Internal Timer Threshold
Internal WT V
Watchdog Disable Hold Current
Internal Watchdog Upper Boundary
Internal Watchdog Lower Boundary
(Note 5)
External Watchdog Upper Boundary
External Watchdog Lower Boundary
(Note 5)
Input Low Voltage
Input High Voltage
Input Pulsewidth
WDI Leakage Current
Input Low Voltage
Input High Voltage
Pull Up Resistance
Pulsewidth
CC
Detect Current
A
= 25°C. V
CONDITIONS
V
C
VM Less Than Reset Threshold
V
V
V
V
⎯ R ⎯ S ⎯ T = V
V
V
V
V
V
V
B Versions, V
C
B Versions, C
RT
RT
MTX
CC
CC
CC
WT
WT
WT
WT
WT
WT
WT
The
= V
= 2.2nF
= 3.3V, I
= 1V, I
= 0.8V, I
= 0.25V
= 1.1V
Rising, Referenced to V
= V
= 0V
= V
= 2.2nF
by More Than 5%
CC
CC
CC
CC
●
CC
RST
denotes the specifi cations which apply over the full operating
= 2.5V, unless otherwise noted. (Note 2)
RST
RST
WT
WT
= 100μA
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.
Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a
period between the lower and upper boundary or ⎯ R ⎯ S ⎯ T is invoked. For the
LTC2917-A/LTC2918-A, the edges must simply occur before the upper
boundary. See Applications Information.
= 2.5mA
= 15μA
= V
= 2.2nF
CC
CC
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
LTC2917/LTC2918
0.8 • V
–100
37.5
MIN
150
130
400
250
1.3
1.1
16
10
–2
50
2
CC
t
WDU(EXT)
–160
0.15
0.15
0.05
–3.5
TYP
200
160
100
1.6
20
80
–3
50
3
1
/32
0.2 • V
–300
MAX
62.5
260
150
200
150
0.4
0.3
0.2
0.4
25
±1
–4
±1
4
8
2
CC
UNITS
29178f
5
mV
ms
ms
ms
ms
ms
kΩ
μA
μA
μA
μA
μA
μA
μs
ns
ns
V
V
V
V
V
V
V
s