NSC LM3700XCBPX-290, LM3700XCBP-308, LM3700XCBP-290, LM3700XBBPX-270, LM3700XBBP-270 Datasheet
LM3700/LM3701
Microprocessor Supervisory Circuit with Low Line
Output
General Description
The LM3700/LM3701 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3700/LM3701 series are available
in a 9-bump micro SMD package.
Built-in features include the following:
Reset: Reset is asserted during power-up, power-down, and
brownout conditions. RESET is guaranteed down to V
CC
of
1.0V.
Low Line Output: This early power failure warning indicator
goes low when the supply voltage drops to a value which is
2% higher than the reset threshold voltage.
Features
n Standard Reset Threshold voltage: 3.08V
n Custom Reset Threshold voltages: For other voltages
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
n No external components required
n RESET (LM3700) or RESET (LM3701) outputs
n Precision supply voltage monitor
n Factory programmable Reset Timeout Delay
n Available in micro SMD package for minimum footprint
n
±
0.5% Reset threshold accuracy at room temperature
n
±
2% Reset threshold accuracy over temperature
extremes
n Reset assertion down to 1V V
CC
(RESET option only)
n 28 µA VCCsupply current
Applications
n Embedded Controllers and Processors
n Intelligent Instruments
n Automotive Systems
n Critical µP Power Monitoring
Typical Application
20011403
September 2003
LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
© 2003 National Semiconductor Corporation DS200114 www.national.com
Connection Diagram
Top View
(looking from the coating side)
micro SMD 9 Bump Package
BPA09
20011401
Pin Descriptions
Bump No. Name Function
B1 V
CC
Power Supply input.
C1 RESET
Reset Logic Output. Pulses low for tRP(Reset Timeout Period) when triggered, and stays
low whenever V
CC
is below the reset threshold or when MR is below V
MRT
. It remains low
for tRPafter either VCCrises above the reset threshold, or after MR input rises above
V
MRT
(LM3700 only).
RESET Reset Logic Output. RESET is the inverse of RESET (LM3701 only).
C3 LLO Low-Line Logic Output. Early Power-Fail warning output. Low when VCCfalls below V
LLOT
(Low-Line Output Threshold). This output can be used to generate an NMI (Non-Maskable
Interrupt) to provide an early warning of imminent power-failure.
B3 GND Ground reference for all signals.
A1, A2, A3,
C2
NC No Connect.
B2 NC No Connect. Test input used at factory only. Leave floating.
LM3700/LM3701
www.national.com 2
Block Diagram
20011405
LM3700/LM3701
www.national.com3
Ordering Information
20011404
*For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office.
LM3700/LM3701
Part Number Output
Reset
Timeout
Period
Package
Marking
LM3700XBBP-270 totem-pole 28ms %%IE
LM3700XBBPX-270 totem-pole 28ms %%IE
LM3700XCBP-290 totem-pole 200ms %%123
LM3700XCBPX-290 totem-pole 200ms %%123
LM3700XCBP-308 totem-pole 200ms %%I0
LM3700XCBPX-308 totem-pole 200ms %%I0
LM3701XCBP-308 totem-pole 200ms %%I1
LM3701XCBPX-308 totem-pole 200ms %%I1
LM3700XBBP-420 totem-pole 28ms %%IF
LM3700XBBPX-420 totem-pole 28ms %%IF
%% is the datecode and will vary with time.
Table Of Functions
Part
Number
Active
Low
Reset
Active
High
Reset
Output
(X = totem-pole)
(Y = open-drain)
Reset
Timeout
Period
Low
Line
Output
LM3700 x X, Y* Customized x
LM3701 x X Customized x
* = available upon request. Contact National
LM3700/LM3701
www.national.com 4
Loading...