LTC1536CMS8#PBF Linear Technology, LTC1536CMS8#PBF Datasheet - Page 7

• Manufacturer Part Number: LTC1536CMS8#PBF
• Description: IC PREC TRPL SPPLY MONITOR 8MSOP
• Manufacturer: Linear Technology
• Type: Multi-Voltage Supervisorr

Specifications of LTC1536CMS8#PBF

• Number Of Voltages Monitored: 3
• Output: Open Drain or Open Collector
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.985V, 4.725V, Adj
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Voltage Supervisor Type: Voltage Monitor
• Number Of Voltage Supervisors: 3
• Monitored Supervisor Voltage: 2.985/4.725/Adj
• Operating Supply Voltage (min): 1V
• Operating Supply Voltage (max): 7V
• Package Type: MSOP
• Operating Temperature Classification: Commercial
• Operating Temp Range: 0C to 70C
• Pin Count: 8
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
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 V
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 V
inputs.
On power-up, either the V
drive circuits for the RST pin. This ensures that RST will
TI I G DIAGRA S
V
RST
CCX
W
U
V
V
CC3 OR
CC
RTX
V
RST
CC5
inputs must be above predetermined thresh-
t
FAIL
V
U
Fast Undervoltage Detect
RTX
V
CC
Monitor Timing
INFORMATION
SLEW RATE ≤0.1V/µs
t
FAIL
U
CC5
W
or V
CC3
W
500mV
t
RST
pin can power the
1536 TD03
U
1536 TD01
CC
be low when either V
any one of the V
threshold, RST will stay a logic low. Once all of the V
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 V
drops below its predetermined threshold and remains
asserted until 200ms after all of the V
their thresholds.
On power-down, once any of the V
its threshold, RST is held at a logic low. A logic low of 0.4V
is guaranteed until V
Pushbutton Reset
The LTC1536 provides a pushbutton reset input pin. The
PBR input has an internal pull-up current source to V
If the PBR pin is not used it can be left floating.
SRST
PBR
RST
t < t
V
RST
CC5
PB
Pushbutton Reset Function Timing
t
DB
3.3V
CC
t
SRST
Power-Fail Detect
inputs is below its predetermined
CC3
CC5
FALL TIME ≤ 10ns, V
t
PF
or V
and V
t
PB
CC3
CC5
reaches 1V. As long as
300mV
CC
drops below 1V.
CC3
CC
inputs drops below
= 3.3V
inputs are above
LTC1536
1536 TD04
t
RST
CC
inputs
1536 TD02
CC3
1536fa
7
CC
.