LTC2938 LINER [Linear Technology], LTC2938 Datasheet - Page 4

• Manufacturer Part Number: LTC2938
• Description: Confi gurable 4- and 6-Supply Monitors with Watchdog Timer
• Manufacturer: LINER [Linear Technology]

LTC2938/LTC2939
ELECTRICAL CHARACTERISTICS
SYMBOL
I
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: The greater of V1, V2 is the internal supply voltage (V
Note 4: Under static no-fault conditions, V1 will necessarily supply
quiescent current. If at any time V2 is larger than V1, V2 must be capable
TYPICAL PERFORMANCE CHARACTERISTICS
4
temperature range, otherwise specifi cations are at T
WDI
WP
1.015
1.010
0.995
0.985
1.005
1.000
0.990
–50
Normalized Threshold Voltages
vs Temperature
–25
0
TEMPERATURE (°C)
PARAMETER
WDI Input Current
WDI Input Pulse Width
25
50
75
100
29389 G01
125
–18
–12
18
12
–6
6
0
A
–50
CC
–ADJ Threshold Voltage
vs Temperature
= 25°C, V
).
CONDITIONS
V
V
V
V
V
WDI
WDI
WDI
WDI
CC
–25
The
= 3.3V or 5.5V
= GND
= 0.7V
= 1.1V
= 5V
0
l
CC
TEMPERATURE (°C)
denotes the specifi cations which apply over the full operating
= 5V unless otherwise specifi ed. (Note 3)
25
of supplying the quiescent current, programming (transient) current and
reference load current.
Note 5: The outputs RST and WDO have internal pull-ups to V2 of typically
6μA. However, external pull-up resistors may be used when faster rise
times are required or for V
to monitor 1.2V, 1.5V, 1.8V and 2.5V supplies, external pull-up resistors
are required to ensure that the output voltage, high, is above the V
threshold of the external circuit.
50
75
100
29389 G02
125
OH
1.228
1.222
1.210
1.204
1.198
1.192
1.216
l
l
l
l
l
voltages greater than V2. For V2 confi gured
–50
V
REF
MIN
–10
10
2
–25
vs Temperature
0
TEMPERATURE (°C)
TYP
25
50
MAX
–30
30
75
IH
100
293839ff
UNITS
input
29389 G03
μA
μA
μA
μA
125
μs