ADM6315-46D1ARTZR7 Analog Devices Inc, ADM6315-46D1ARTZR7 Datasheet - Page 7

• Manufacturer Part Number: ADM6315-46D1ARTZR7
• Description: IC SUPERVISOR OD 4.63V SOT143
• Manufacturer: Analog Devices Inc
• Type: Simple Reset/Power-On Resetr

Specifications of ADM6315-46D1ARTZR7

• Package / Case: SOT-143, SOT-143B, TO-253AA
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 125°C
• Output: Open Drain or Open Collector
• Reset: Active Low
• Number Of Voltages Monitored: 1
• Reset Timeout: 1 ms Minimum
• Voltage - Threshold: 4.63V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

THEORY OF OPERATION
INTERFACING TO OTHER DEVICES’ OUTPUT
The ADM6315 series is designed to integrate with as many
devices as possible. One feature of the ADM6315 is the RESET
open-drain output, which can sink current from sources with a
voltage greater than the V
suitable for use in more diverse applications.
BENEFITS OF A VERY ACCURATE RESET THRESHOLD
Because the ADM6315 series can operate effectively even when
there are large degradations of the supply voltages (due to an
accurate internal voltage reference circuit), the possibility of a
malfunction during a power failure is greatly reduced.
DETAILED DESCRIPTION
The ADM6315 is designed to protect the integrity of a system’s
operation by ensuring the proper operation of the system
during power-up, power-down, and brownout conditions.
When the ADM6315 is powered up, the RESET output of the
ADM6315 remains low for a period typically equal to the RESET
active timeout period. This is designed to give the system time
to power up correctly and for the power supply to stabilize
before any devices are brought out of reset and allowed to begin
executing instructions. Initializing a system in this way provides
a more reliable startup for microprocessor systems.
When a brownout condition occurs (assuming V
1 mV/μs), the ADM6315 produces a reset in typically 35 μs.
Producing a reset this fast means that the entire system can be
reset together before any part of the system’s voltage falls below
its recommended operating voltage. This can avoid dangerous
and/or erroneous operation of a microprocessor-based system.
Figure 10. V
V
RESET
CC
V
CC
TRIP POINT (MAX)
V
V
CC
CC
CC
Power-Down/Brownout Timing Diagram
TO RESET
TRIP POINT
DELAY
CC
of the ADM6315 input, making it
V
CC
VOL
TRIP POINT (MIN)
CC
is falling at
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MANUAL RESET INPUT
The ADM6315 also provides an additional input, MR . This
input can be used either as a means for the system operator to
reset the system manually via a switch or for a digital circuit to
reset the system.
The MR input (typically) ignores negative-going pulses that are
faster than 100 ns, and it is guaranteed to accept any negative-
going input pulse of a duration greater than or equal to 1 μs. If
MR is connected to long cables or is used in a noisy environment,
placing a 1 μF decoupling capacitor between the MR input and
ground further improves the glitch immunity of the ADM6315.
TRANSIENT IMMUNITY
As well as being an accurate reset circuit, the ADM6315 has
good immunity from negative-going transients (see Figure 7).
Because of this characteristic, the ADM6315 is suitable for use
in noisy environments.
Figure 7 shows the RESET comparator overdrive (the maximum
magnitude of negative-going pulses with respect to the typical
reset threshold) vs. the pulse duration without a reset.
V
CC
TRIP POINT (MIN)
RESET
V
CC
Figure 11. V
CC
V
CC
Power-Up Timing Diagram
RESET ACTIVE TIMEOUT
V
TRIP POINT
CC
TRIP POINT (MAX)
ADM6315