Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

LM3705YDBP-308 Arkusz danych(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM3705YDBP-308
Szczegółowy opis  Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3705YDBP-308 Arkusz danych(HTML) 9 Page - National Semiconductor (TI)

Back Button LM3705YDBP-308 Datasheet HTML 5Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 6Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 7Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 8Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 9Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 10Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 11Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 12Page - National Semiconductor (TI) LM3705YDBP-308 Datasheet HTML 13Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 17 page
background image
Circuit Information
Reset Output
The Reset input of a µP initializes the device into a known
state. The LM3704/LM3705 microprocessor supervisory cir-
cuits assert a forced reset output to prevent code execution
errors during power-up, power-down, and brownout condi-
tions.
RESET is guaranteed valid for V
CC > 1V. Once VCC ex-
ceeds the reset threshold, an internal timer maintains the
output for the reset timeout period. After this interval, reset
goes high. The LM3704 offers an active-low RESET; The
LM3705 offers an active-high RESET.
Any time V
CC drops below the reset threshold (such as
during a brownout), the reset activates. When V
CC again
rises above the reset threshold, the internal timer starts.
Reset holds until V
CC exceeds the reset threshold for longer
than the reset timeout period. After this time, reset releases.
The Manual Reset input (MR) will initiate a forced reset also.
See the Manual Reset Input section.
Reset Threshold
The LM3704/LM3705 family is available with a reset voltage
of 3.08V. Other reset thresholds in the 2.20V to 5.0V range,
in steps of 10 mV, are available; contact National Semicon-
ductor for details.
Manual Reset Input (MR)
Many µP-based products require a manual reset capability,
allowing the operator to initiate a reset. The MR input is fully
debounced and provides an internal 56 k
Ω pull-up. When the
MR input is pulled below V
MRT (1.225V) for more than 25 µs,
reset is asserted after a typical delay of 12 µs. Reset remains
active as long as MR is held low, and releases after the reset
timeout period expires after MR rises above V
MRT. Use MR
with digital logic to assert or to daisy chain supervisory
circuits. It may be used as another low-line comparator by
adding a buffer.
Power-Fail Comparator (PFI/PFO)
The PFI is compared to a 1.225V internal reference, V
PFT.If
PFI is less than V
PFT, the Power Fail Output PFO drops low.
The power-fail comparator signals a falling power supply,
and is driven typically by an external voltage divider that
senses either the unregulated supply or another system
supply voltage. The voltage divider generally is chosen so
the voltage at PFI drops below V
PFT several milliseconds
before the main supply voltage drops below the reset thresh-
old, providing advanced warning of a brownout.
The voltage threshold is set by R
1 and R2 and is calculated
as follows:
Note this comparator is completely separate from the rest of
the circuitry, and may be employed for other functions as
needed.
Low-Line Output (LLO)
The low-line output comparator is typically used to provide a
non-maskable interrupt to a µP when V
CC begins falling. LLO
monitors V
CC and goes low when VCC falls below VLLOT
(typically 1.02
V
RST) with hysteresis of 0.0032 VRST.
Special Precautions for the micro SMD Package
As with most integrated circuits, the LM3704 and LM3705
are sensitive to exposure from visible and infrared (IR) light
radiation. Unlike a plastic encapsulated IC, the micro SMD
package has very limited shielding from light, and some
sensitivity to light reflected from the surface of the PC board
or long wavelength IR entering the die from the side may be
experienced. This light could have an unpredictable affect on
the electrical performance of the IC. Care should be taken to
shield the device from direct exposure to bright visible or IR
light during operation.
Micro SMD Mounting
The micro SMD package requires specific mounting tech-
niques which are detailed in National Semiconductor Appli-
cation Note AN-1112. Referring to the section Surface
Mount Technology (SMT) Assembly Considerations,it
should be noted that the pad style which must be used with
the 9-pin package is the NSMD (non-solder mask defined)
type.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
www.national.com
9


Podobny numer części - LM3705YDBP-308

ProducentNumer częściArkusz danychSzczegółowy opis
logo
National Semiconductor ...
LM3700 NSC-LM3700 Datasheet
195Kb / 12P
   Microprocessor Supervisory Circuit with Low Line Output
logo
Texas Instruments
LM3700 TI-LM3700 Datasheet
246Kb / 12P
[Old version datasheet]   LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
LM3700XCBP-290 TI-LM3700XCBP-290 Datasheet
246Kb / 12P
[Old version datasheet]   LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
logo
National Semiconductor ...
LM3700XCBP-308 NSC-LM3700XCBP-308 Datasheet
195Kb / 12P
   Microprocessor Supervisory Circuit with Low Line Output
LM3700XCBPX-308 NSC-LM3700XCBPX-308 Datasheet
195Kb / 12P
   Microprocessor Supervisory Circuit with Low Line Output
More results

Podobny opis - LM3705YDBP-308

ProducentNumer częściArkusz danychSzczegółowy opis
logo
National Semiconductor ...
LM3710 NSC-LM3710 Datasheet
319Kb / 16P
   Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset and Watchdog Timer
LM3702 NSC-LM3702 Datasheet
222Kb / 13P
   Microprocessor Supervisory Circuits with Low Line Output and Manual Reset
logo
Texas Instruments
LM3710 TI1-LM3710 Datasheet
1Mb / 19P
[Old version datasheet]   LM3710/LM3711 Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset and Watchdog Timer
logo
National Semiconductor ...
LM3712 NSC-LM3712 Datasheet
244Kb / 13P
   Microprocessor Supervisory Circuits with Separate Watchdog Timer Output, Power Fail Input and Manual Reset
LM3709 NSC-LM3709 Datasheet
232Kb / 11P
   Microprocessor Supervisory Circuits with Low Line Output, Manual Reset and Watchdog Timer
logo
SG Micro Corp
SGM811 SGMICRO-SGM811_15 Datasheet
360Kb / 2P
   Microprocessor Supervisory with Manual Reset Input
SGM811 SGMICRO-SGM811_17 Datasheet
1Mb / 12P
   Microprocessor Supervisory with Manual Reset Input
SGM811 SGMICRO-SGM811 Datasheet
480Kb / 9P
   Microprocessor Supervisory with Manual Reset Input
logo
Texas Instruments
LM3704 TI1-LM3704 Datasheet
396Kb / 18P
[Old version datasheet]   Voltage Supervisor With Power-Fail Input, Low-Line Output and Manual Reset
logo
ams AG
AS1916 AMSCO-AS1916 Datasheet
401Kb / 13P
   Microprocessor Supervisory Circuits with Manual Reset and Watchdog
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com