ADM6315-44D2ARTRL7 Analog Devices Inc, ADM6315-44D2ARTRL7 Datasheet - Page 6

• Manufacturer Part Number: ADM6315-44D2ARTRL7
• Description: IC SUPERVISOR OD 3.90V SOT143
• Manufacturer: Analog Devices Inc
• Type: Simple Reset/Power-On Resetr

Specifications of ADM6315-44D2ARTRL7

• 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: 140 ms Minimum
• Voltage - Threshold: 4.39V
• Other names: ADM631544D2ARTRL7

ADM6315
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 (depending on the selected
reset active timeout), 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 instruc-
tions. Initializing a system in this way provides a more reliable
startup for microprocessor systems.
Figure 2. V
RESET
V
V
CC
CC
CC
TRIP POINT (MAX)
Power-Down/Brownout Timing Diagram
V
CC
V
CC
TRIP POINT
DELAY
TO RESET
CC
of the ADM6315 input, making it
V
CC
VOL
TRIP POINT (MIN)
–6–
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.
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
manually reset the system via a switch or for a digital circuit to
reset the system.
The MR input (typically) ignores negative going pulses faster
than 100 ns and is guaranteed to accept any negative going input
pulse of a duration greater than or equal to 1 µs. If MR is con-
nected to long cables or is used in a noisy environment, then 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 to negative going transients (TPC 4). Because
of this characteristic, the ADM6315 is suitable for use in noisy
environments.
TPC 4 shows the reset comparator overdrive (the maximum mag-
nitude of negative going pulses with respect to the typical reset
threshold) versus the pulse duration, without causing a reset.
V
CC
TRIP POINT (MIN)
Figure 3. V
V
RESET
CC
CC
Power-Up Timing Diagram
V
CC
RESET ACTIVE TIMEOUT
V
TRIP POINT
CC
TRIP POINT (MAX)
CC
is falling at
REV. C