參數(shù)資料
型號(hào)： LTC1985ES5-1.8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
封裝： PLASTIC, SOT-23, 5 PIN
文件頁(yè)數(shù)： 5/8頁(yè)
文件大?。?/td> 135K
代理商： LTC1985ES5-1.8
5
LTC1985-1.8
V
CC
Monitor Timing
t
RST
1985-18 TD
V
RTX
V
CCX
RST
TIW
W
Supply Monitoring
The LTC1985 is a low power, high accuracy triple supply
monitoring cirucit with a single 200ms microprocessor
reset output.
All three V
CC
inputs must be above predetermined thresh-
olds for reset not to be invoked. The LTC1985 will assert
reset during power-up, power-down and brownout condi-
tions on any one or all of the V
CC
inputs.
3V or 1.8V Power Detect
The LTC1985 is powered from the 3V input pin (V
CC3
) or
the 1.8V input pin (V
CC18
), whichever pin has the highest
potential. This ensures the part pulls the RST pin low as
soon as either input pin is
≥
1V.
Power-Up
Upon power-up, either the V
CC18
or V
CC3
pin, can power
the part. This ensures that RST will be low when either
V
CC18
or V
CC3
reaches 1V. As long as any one of the V
CC
inputs is below its predetermined threshold, RST will stay
a logic low. Once all of the V
CC
inputs rise above their
thresholds, an internal timer is started and RST is released
after 200ms.
RST is reasserted whenever any one of the V
CC
inputs
drops below its predetermined threshold and remains
asserted until 200ms after all of the V
CC
inputs are above
their thresholds.
Power-Down
On power-down, once any of the V
CC
inputs drop below its
threshold, RST is held at a logic low. A logic low of 0.3V is
guaranteed until both V
CC3
and V
CC18
drop below 1V.
Override Functions
The V
CCA
pin, if unused, can be tied to either V
CC3
or V
CC18
.
This is an obvious solution since the trip points for V
CC3
and V
CC18
will always be greater than the trip point for
V
CCA
. Likewise, the V
CC18
, if unused, can be tied to V
CC3
.
V
CC3
must always be used. Tying V
CC3
to V
CC18
and
operating off of a 1.8V supply will result in the continuous
assertion of RST.
APPLICATIOU
W
U
U
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