Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADM6315-44D1ARTRL7 Datasheet(PDF) 7 Page - Analog Devices

Part No. ADM6315-44D1ARTRL7
Description  Open-Drain Microprocessor Supervisory Circuit in 4-Lead SOT-143
Download  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo 

ADM6315-44D1ARTRL7 Datasheet(HTML) 7 Page - Analog Devices

Zoom Inzoom in Zoom Outzoom out
 7 / 12 page
background image
ADM6315
Rev. E | Page 7 of 12
THEORY OF OPERATION
MANUAL RESET INPUT
INTERFACING TO OUTPUT OF OTHER DEVICES
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 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 VCC of the ADM6315 input, making it
suitable for use in more diverse applications.
MR
The
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
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.
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.
VCC TRIP POINT (MAX)
VCC TRIP POINT
VCC
VCC TRIP POINT (MIN)
RESET
RESET ACTIVE TIMEOUT
RESET
VOL
VCC TRIP POINT (MAX)
VCC TRIP POINT
VCC TO RESET
DELAY
VCC
VCC TRIP POINT (MIN)
Figure 10. VCC Power-Down/Brownout Timing Diagram
Figure 11. VCC Power-Up Timing Diagram
DETAILED DESCRIPTION
TRANSIENT IMMUNITY
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.
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.
RESET
When the ADM6315 is powered up, the
output of the
ADM6315 remains low for a period typically equal to the RESET
active timeout period. This feature allows adequate time for the
system 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.
RESET
When a brownout condition occurs (assuming VCC is falling at
1 mV/μs), the ADM6315 produces a reset in 35 μs typical.
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 system reset can avoid
dangerous and/or erroneous operation of a microprocessor-
based system.
Figure 7 shows the
comparator overdrive (the maximum
magnitude of negative-going pulses with respect to the typical
reset threshold) vs. the pulse duration without a reset.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn