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LTC1536 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1536
Description  Precision Triple Supply Monitor for PCI Applications
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1536 Datasheet(HTML) 7 Page - Linear Technology

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LTC1536
1536fa
TI I G DIAGRA S
VCC Monitor Timing
Pushbutton Reset Function Timing
t < tPB
tPB
tRST
tDB
tSRST
1536 TD02
PBR
RST
SRST
tRST
1536 TD01
VRTX
VCCX
RST
tFAIL Fast Undervoltage Detect
tFAIL
500mV
1536 TD03
VCC3 OR
VCC5
VRTX
SLEW RATE
≤0.1V/µs
RST
tPF
300mV
1536 TD04
VCC5
FALL TIME
≤ 10ns, VCC3 = 3.3V
RST
3.3V
Power-Fail Detect
APPLICATIONS INFORMATION
Operation
The LTC1536 is a low power, high accuracy triple supply
monitoring circuit. This reset generator has two basic
functions: generation of a reset when power supplies are
out of range, and generation of a reset or “soft” reset when
the reset button is pushed. The LTC1536 has the added
feature that when the reset supplies are grossly undervolt-
age there is a very short delay from undervoltage detect to
assertion of RST.
Supply Monitoring
All three VCC inputs must be above predetermined thresh-
olds for 200ms before the reset output is released. The
LTC1536 will assert reset during power-up, power-down
and brownout conditions on any one or more of the VCC
inputs.
On power-up, either the VCC5 or VCC3 pin can power the
drive circuits for the RST pin. This ensures that RST will
be low when either VCC5 or VCC3 reaches 1V. As long as
any one of the VCC inputs is below its predetermined
threshold, RST will stay a logic low. Once all of the VCC
inputs rise above their thresholds, an internal timer is
started and RST is released after 200ms. RST outputs the
inverted state of what is seen on RST.
RST is reasserted whenever any one of the VCC inputs
drops below its predetermined threshold and remains
asserted until 200ms after all of the VCC inputs are above
their thresholds.
On power-down, once any of the VCC inputs drops below
its threshold, RST is held at a logic low. A logic low of 0.4V
is guaranteed until VCC3 and VCC5 drops below 1V.
Pushbutton Reset
The LTC1536 provides a pushbutton reset input pin. The
PBR input has an internal pull-up current source to VCC3.
If the PBR pin is not used it can be left floating.


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