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參數(shù)資料
| 型號： | LM3709XMBPX-308 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, BGA9 |
| 封裝： | MICRO, BUMP, SMD-9 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 227K |
| 代理商： | LM3709XMBPX-308 |
Typical Performance Characteristics (Continued)
Watchdog Timeout Period vs Temperature
(t
WD programmed as 6.2ms)
Low-Line Comparator Propagation Delay vs Temperature
20011713
20011714
Circuit Information
Reset Output
The Reset input of a P initializes the device into a known
state. The LM3708/LM3709 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 LM3708 offers an active-low RESET; The
LM3709 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 LM3708/LM3709 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 P-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
pull-up. When the
MR input is pulled below V
MRT (1.225V) for more than 25 s,
reset is asserted after a typical delay of 12 s. 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.
Low-Line Output (LLO)
The low-line output comparator is typically used to provide a
non-maskable interrupt to a P 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.
Watchdog Timer Input (WDI)
The watchdog timer input monitors one of the microproces-
sor’s output lines for activity. Each time a transition occurs on
this monitored line, the watchdog counter is reset. However,
if no transition occurs and the timeout period is reached, the
LM3708/LM3709 assumes that the microprocessor has
locked up and the reset output is activated.
WDI is a high impedance input.
Special Precautions for the micro SMD Package
As with most integrated circuits, the LM3708 and LM3709
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.
LM3708/LM3709
www.national.com
8
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