3

LTC2901

2901is sn2901

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

150

µs

by More Than 1%

Output Voltage Low RST, COMPX

q

0.15

0.4

V

q

0.05

0.3

V

q

0.05

0.3

V

Output Voltage High RST, WDO, COMPX

q

V2 – 1

V

(Note 5)

Output Voltage Low WDO

q

0.15

0.4

V

Output Voltage High RST (LTC2901-2)

q

0.8 • V2

V

(Note 6)

CWT Pull-Up Current

q

–1.4

–2

–2.6

µA

CWT Pull-Down Current

q

10

20

30

µA

Watchdog Time-Out Period

q

20

30

40

ms

WDI Input Threshold High

q

1.6

V

WDI Input Threshold Low

q

0.4

V

WDI Input Pulse Width

q

150

ns

WDI Pull-Up Current

–10

µA

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: All voltage values are with respect to GND.

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 of supplying

the quiescent current, programming (transient) current and reference load

current.

Note 5: The output pins RST, WDO and COMPX have internal pull-ups to V2

of typically 6

µA. However, external pull-up resistors may be used when faster

Note 6: The push-pull RST output pin on the LTC2901-2 is

actively pulled up

to V2.