PulseCore ASM802LCSAF μp power supply supervisor with battery backup switch Datasheet

ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
µP Power Supply Supervisor With Battery Backup Switch
General Description
• Short circuit protection and thermal limiting
The ASM690A / ASM692A / ASM802L / ASM802M /
• Small 8-pin SO and 8-pin PDIP packages
ASM805L offers complete single chip solutions for power
• No external components
supply monitoring and control battery functions in
• Specified over full temperature range
microprocessor systems. Each device implements four
functions: Reset control, watchdog monitoring, battery-
Applications
backup switching and powerfailure monitoring. In addition
• Embedded control systems
to microprocessor reset under power-up and power-down
• Portable/Battery operated systems
conditions,
• Intelligent instruments
these
devices
provide
battery-backup
switching to maintain control in power loss and brown-out
• Wireless instruments
situations. Additional monitoring capabilities can provide
• Wireless communication systems
an early warning of unregulated power supply loss before
• PDAs and hand-held equipments
the voltage regulator drops out. The important features of
• µP / µC power supply monitoring
these four functions are:
• Safety system
• 1.6 second watchdog timer to keep microprocessor
responsive
Typical Operating Circuit
• 4.40V or 4.65V VCC threshold for microprocessor reset
at power-up and power-down
• SPDT
(Single-pole, Double-throw) PMOS switch
connects backup power to RAM if VCC fails
• 1.25V threshold detector for power loss or general
purpose voltage monitoring
These features are pin-compatible with the industry
standard power-supply supervisors. Short-circuit and
thermal protection have also been added. The ASM690A
/ ASM802L / ASM805L generate a reset pulse when the
supply voltage drops below 4.65V and the ASM692A /
ASM802M generate a reset below 4.40V. The ASM802L /
Block Diagram
ASM802M have power-fail accuracy to ± 2%. The
ASM805L is the same as the ASM690A except that
RESET is provided instead of RESET.
Features
• Two precision supply-voltage monitor options
4.65V (ASM690A / ASM802L / ASM805L)
4.40V (ASM692A / ASM802M )
• Battery-backup power switch on-chip
• Watchdog timer: 1.6 second timeout
• Power failure / low battery detection
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Pin Configuration
Pin Description
Pin Number
ASM690A/
ASM692A
Name
Function
ASM805L
ASM802L/
ASM802M
Voltage supply for RAM. When VCC is above the reset threshold, VOUT
connects to VCC through a P-Channel MOS device. If VCC falls below the
1
1
VOUT
reset threshold, this output will be connected to the backup supply at VBATT
(or VCC, whichever is higher) through the MOS switch to provide continuous
power to the CMOS RAM.
2
2
VCC
+5V power supply input.
3
3
GND
Ground
Power failure monitor input. PFI is connected to the internal power fail
4
4
PFI
comparator which is referenced to 1.25V. The power fail output (PFO) is
active LOW but remains HIGH if PFI is above 1.25V. If this feature is
unused, the PFI pin should be connected to GND or VOUT.
5
5
Power-fail output. PFO is active LOW whenever the PFI pin is less than
PFO
1.25V.
Watchdog input. The WDI input monitors microprocessor activity. An internal
timer is reset with each transition of the WDI input. If the WDI is held HIGH
6
6
WDI
or LOW for longer than the watchdog timeout period, typically 1.6 seconds,
RESET (or RESET) is asserted for the reset pulse width time, tRS, of
140ms, minimum.
Active-LOW reset output. When triggered by VCC falling below the reset
threshold or by watchdog timer timeout, RESET pulses low for the reset
7
-
pulse width tRS, typically 200ms. It will remain low if VCC is below the reset
RESET
threshold (4.65V in ASM690A / ASM802L and 4.4V in the ASM692A /
ASM802L) and remains low for 200ms after VCC rises above the reset
threshold.
-
7
RESET
8
8
VBATT
Active-HIGH reset output. The inverse of RESET.
Auxiliary power or backup-battery input. VBATT should be connected to GND
if the function is not used. The input has about 40mV of hysteresis to
prevent rapid toggling between VCC and VBATT.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
2 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Detailed Description
It is important to initialize a microprocessor to a known
Application Information
state in response to specific events that could create
Microprocessor Interface
code execution errors and “lock-up”. The reset output of
The ASM690 has logic-LOW RESET output while the
these supervisory circuits send a reset pulse to the
ASM805 has an inverted logic-HIGH RESET output.
microprocessor
Microprocessors with bidirectional reset pins can pose a
in
response
to
power-up,
power-
down/power-loss or a watchdog time-out.
problem
when
the
supervisory
circuit
and
the
microprocessor output pins attempt to go to opposite
RESET/RESET Timing
Power-up reset occurs when a rising VCC reaches the
reset threshold, VRT, forcing a reset condition in which
logic states. The problem can be resolved by placing a
4.7kΩ resistor between the RESET output and the
the reset output is asserted in the appropriate logic state
microprocessor reset pin. This is shown in Figure 2.
for the duration of tRS. The reset pulse width, tRS, is
Since the series resistor limits drive capabilities, the reset
typically around 200ms and is LOW for the ASM690A,
signal to other devices should be buffered.
ASM692A, ASM802 and HIGH for the ASM805L.
Figure 1 shows the reset pin timing.
Power-loss or “brown-out” reset occurs when VCC dips
below the reset threshold resulting in a reset assertion for
the duration of tRS. The reset signal remains asserted as
long as VCC is between VRT and 1.1V, the lowest VCC for
which thesedevices can provide a guaranteed logic-low
output. To ensure logic inputs connected to the ASM690A
/ ASM692A/ASM802 RESET pin are in a known state
when VCC is under 1.1V, a 100kΩ pull-down resistor at
RESET is needed: the logic-high ASM805L will need a
pull-up resistor to VCC.
Watchdog Timer
A Watchdog time-out reset occurs when a logic “1” or
logic “0” is continuously applied to the WDI pin for more
than 1.6 seconds. After the duration of the reset interval,
the watchdog timer starts a new 1.6 second timing
interval; the microprocessor must service the watchdog
input by changing states or by floating the WDI pin before
this interval is finished. If the WDI pin is held either HIGH
or LOW, a reset pulse will be triggered every 1.8 seconds
(the 1.6 second timing interval plus the reset pulse width
tRS).
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
3 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Watchdog Input
As discussed in the Reset section, the Watchdog input is
used to monitor microprocessor activity. It can be used to
insure that the microprocessor is in a continually
responsive state by requiring that the WDI pin be toggled
every second. If the WDI pin is not toggled within the 1.6
second window (minimum tWD + tRS), a reset pulse will be
asserted to return the microprocessor to the initial
start-up state. Pulses as short as 50ns can be applied to
the WDI pin. If this feature is not used, the WDI pin
should be open circuited or the logic placed into a highimpedance state to allow the pin to float.
Backup-Battery Switchover
A power loss can be made less severe if the system RAM
Table 1. Pin Connections in Battery Backup Mode
contents are preserved. This is achieved in the
ASM690/692/ 802/805 by switching from the failed VCC to
an alternate power source connected at VBATT when VCC
is less than the reset threshold voltage (VCC < VRT), and
VCC is less than VBATT. The VOUT pin is normally
connected to VCC through a 2Ω PMOS switch but a
brown-out or loss of VCC will cause a switchover to VBATT
by means of a 20Ω PMOS switch. Although both
conditions (VCC < VRT and VCC <VBATT) must occur for
the switchover to VBATT to occur, VOUT will be switched
back to VCC when VCC exceeds VRT irrespective of the
Pin
Connection
VOUT
Connected to VBATT through internal
PMOS switch
VBATT
Connected to VOUT
PFI
PFO
RESET
WDI
Disabled
Logic-LOW
Logic-LOW (except on ASM805 where
it is HIGH)
Watchdog timer disabled
voltage at VBATT. It should be noted that an internal
device diode (D1 in Figure 3) will be forward biased if
During the backup power mode, the internal circuitry of
VBATT exceeds VCC by more than a diode drop when VCC
the supervisory circuit draws power from the battery
is switched to VOUT. Because of this it is recommended
supply. While VCC is still alive, the comparator circuits
that VBATT be no greater than VRT +0.6V.
remain alive and the current drawn by the device is
typically 35µA. When VCC drops more than 1.1V below
VBATT, the internal switchover comparator, the PFI
Condition
SW1/SW2
SW3/SW4
VCC > Reset Threshold
Open
Closed
the quiescent current drawn by the IC to less than 1µA.
VCC < Reset Threshold
VCC > VBATT
Open
Closed
Backup Power Sources - Batteries
VCC < Reset Threshold
VCC < VBATT
Closed
Open
comparator and WDI comparator will shut off, reducing
Battery voltage selection is important to insure that the
ASM690A/802A/805L Reset Threshold = 4.65V
ASM692A /ASM802M Reset Threshold = 4.4V
battery does not discharge through the parasitic device
diode D1 (see Figure 3) when VCC is less than VBATT and
VCC >VRT.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
4 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
the ASM692A/802M or within ±10% of 5V for the
Table 2: Maximum Battery Voltages
ASM690A/802L/805L to insure that the storage capacitor
does not achieve an over voltage state.
Part Number
MAXIMUM Battery Voltage (V)
ASM690A
4.80
ASM802L
4.80
ASM805L
4.80
ASM692A
4.55
ASM802M
4.55
Note: SuperCapTM is a trademark of Baknor Industries
Although most batteries that meet the requirements of
Table2 are acceptable, lithium batteries are very effective
backup source due to their high-energy density and very
low selfdischarge rates.
Battery replacement while Powered
Batteries can be replaced even when the device is in a
powered state as long as VCC remains above the reset
threshold voltage VRT. In the ASM devices, a floating
VBATT pin will not cause a powersupply switchover as can
occur in some other supervisory circuits. If VBATT is not
used, the pin should be grounded.
Backup Power Sources - SuperCap™
Capacitor storage, with very high values of capacitance,
can be used as a back-up power source instead of
batteries. SuperCap™ are capacitors with capacities in
the fractional farad range. A 0.1 farad SuperCap™ would
provide a useful backup power source. Like the battery
supply, it is important that the capacitor voltage remain
below the maximum voltages shown in Table 2. Although
the circuit of Figure 4 shows the most simple way to
connect the SuperCap™, this circuit cannot insure that an
over voltage condition will not occur since the capacitor
Operation without a Backup Power Source
will ultimately charge up to VCC. To insure that an over
When operating without a back-up power source, the
voltage condition does not occur, the circuit of Figure 5 is
VBATT pin should be connected to GND and VOUT should
preferred. In this circuit configuration, the diode-resistor
be connected to VCC, since power source switchover will
pair clamps the capacitor voltage at one diode drop below
not occur. Connecting VOUT to VCC eliminates the voltage
VCC. VCC itself should be regulated within ±5% of 5V for
drop due to the ON-resistance of the PMOS switch.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
5 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Power-Fail Comparator
reasonable and should be larger than 10kΩ to avoid
The Power Fail feature is an independent voltage
excessive loading on the PFO pin. The calculations for
monitoring function that can be used for any number of
the correct values of resistors to set the hysteresis
monitoring activities. The PFI function can provide an
thresholds are given in Figure 7. A capacitor can be
early sensing of power supply failure by sensing the
added to offer additional noise rejection by low-pass
voltage of the unregulated DC ahead of the regulated
filtering.
supply sensing seen by the backup-battery switchover
circuitry. The PFI pin is compared to a 1.25V internal
reference. If the voltage at the PFI pin is less than this
reference voltage, the PFO pin goes low. By sensing the
voltage of the raw DC power supply, the microprocessor
system can prepare for imminent power-loss, especially if
the battery backup supply is not enabled. The input
voltage at the PFI pin results from a simple resistor
voltage divider as shown in Figure 6.
Power Fail Hysteresis
A noise margin can be added to the simple monitoring
circuit of Figure 6 by adding positive feedback from the
PFO pin. The circuit of Figure 7 adds this positive
“latching” effect by means of an additional resistor R3
connected between PFO and PFI which helps in pulling
PFI in the direction of PFO and eliminating an indecision
at the trip point. Resistor R3 is normally about 10 times
higher in resistance than R2 to keep the hysteresis band
Monitoring Capabilities Of The Power-fail Input:
Although designed for power supply failure monitoring,
the PFI pin can be used for monitoring any voltage
condition that can be scaled by means of a resistive
divider. An example is the negative power supply monitor
configured in Figure 8. In this case a good negative
supply will hold the PFI pin below 1.25V and the PFO pin
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
6 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
will be at logic “0”. As the negative voltage declines, the
voltage at the PFI pin will rise until it exceeds 1.25V and
the PFO pin will go to logic “1”.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
7 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Absolute Maximum Ratings
Parameter
Min
Max
Unit
VCC
-0.3
6.0
V
VBATT
-0.3
6.0
V
All other inputs1
-0.3
VCC + 0.3
V
Input Current at VCC
200
mA
Input Current at VBATT
50
mA
Input Current at GND
20
mA
Pin Terminal Voltage with Respect to Ground
Output Current
VOUT
Short circuit protected
All other inputs
20
mA
Rate of Rise: VBATT and VCC
100
V/µs
Plastic DIP (derate 9mW/°C above 70°C)
800
mW
SO (derate 5.9mW/°C above 70°C)
500
mW
Continuous Power Dissipation
Operating Temperature Range (C Devices)
0
70
°C
Operating Temperature Range (E Devices)
-40
85
°C
Storage Temperature Range
-65
160
°C
300
°C
1
100
KV
V
Lead Temperature (Soldering, 10 sec)
ESD rating
HBM
MM
1. The input voltage limits on PFI and WDI may be exceeded if the current is limited to less than 10mA
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods
may affect device reliability.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
8 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Electrical Characteristics
Unless other wise noted, VCC = 4.75V to 5.5V for the ASM690A / ASM802L / ASM805L and VCC = 4.5V to 5.5V for the
ASM692A / ASM802M;VBATT = 2.8V; and TA = TMIN to TMAX.
Parameter
VCC, VBATT Voltage
Range (Note 1)
Supply Current
Excluding IOUT
SYMBOL
Conditions
35
IS
TA = 25°C
VCC = 0V, VBATT = 2.8V
VBATT Standby
Current (Note 2)
5.5V>VCC>VBATT + 0.2V
VOUT Output
VOUT in Battery
Backup Mode
Battery Switch
Threshold,
VCC to VBATT
Battery Switch over
Hysteresis
VRT
TA = 25°C
TA =TMIN to TMAX
-0.1
-1.0
100
µA
IOUT = 50mA
IOUT=250µA, VCC < VBATT - 0.2V
VBATT- 0.1
Power Up
Power Down
ASM690A/802L/805L
ASM692A, ASM802M
ASM802L, TA = 25°C, VCC falling
ASM802M, TA=25°C, VCC falling
4.50
4.25
4.55
4.30
tRS
140
ISOURCE = 800µA
ISINK = 3.2mA
ASM69_AC,ASM802_C,VCC=1.0V,ISINK=50µA
ASM69_AE,ASM802_E,VCC=1.2V,ISINK=100µA
ASM805LC, ISOURCE=4µA, VCC = 1.1V
ASM805LE, ISOURCE=4µA, VCC = 1.2V
ASM805L, ISOURCE=800µA
tWD
WDI Pulse Width
tWP
V
V
20
-20
mV
40
mV
4.65
4.40
200
VCC - 1.5
4.75
4.50
4.70
4.45
mV
280
ms
0.4
0.3
0.3
V
0.4
1.60
2.25
sec
50
-50
150
µA
µA
0.8
V
ns
50
-150
VCC = 5V, Logic LOW
VCC = 5V, Logic HIGH
V
0.8
0.9
VCC - 1.5
1.00
VIL = 0.4V, VIH = 0.8VCC
WDI = VCC
WDI = 0V
µA
VCC0.010
VCC0.10
VBATT
0.001
40
Watchdog Timeout
WDI Input
Threshold
(Note 3)
V
0.02
0.02
ASM805L, ISINK=3.2mA
WDI Input Current
5.5
µA
Reset Threshold
Hysteresis
Reset Output
Voltage
Unit
5.0
VCC-0.025
VCC-0.25
VCC < VRT
Max
1.5
TA =TMIN to TMAX
IOUT = 5mA
Reset Pulse Width
TYP
1.1
ISUPPLY in Battery
Backup Mode
(Excluding IOUT)
Reset Threshold
Min
3.5
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
9 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Parameter
SYMBOL
PFI Input Threshold
Conditions
ASM69_A, ASM805L, VCC = 5V
ASM802_C/E, VCC = 5V
PFI Input Current
PFO Output
Voltage
ISOURCE = 800µA
ISINK = 3.2mA
Min
TYP
Max
Unit
1.20
1.225
1.25
1.250
1.30
1.275
V
-25
0.01
25
nA
VCC - 1.5
0.4
V
Notes:
1. If VCC or VBATT is 0V, the other must be greater than 2.0V.
2. Battery charging-current is “-”. Battery discharge current is “+”.
3. WDI is guaranteed to be in an intermediate level state if WDI is floating and VCC is within the operating voltage range.
WDI input impedance is 50 kΩ. WDI is biased to 0.3VCC.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
10 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Package Dimensions
8-lead PDIP Package
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
11 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
8-lead (150-mil) SOIC Package
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
12 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Ordering Information - Tin - Lead Devices
Reset Threshold (V)
Temperature (°C)
Pins-Package
Package
Marking
ASM690ACPA
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM690ACPA
ASM690ACSA
4.5 to 4.75
0 to +70
8-SO
ASM690ACSA
Part Number
ASM690A
ASM690AEPA
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM690AEPA
ASM690AESA
4.5 to 4.75
-40 to +85
8-SO
ASM690AESA
ASM692ACPA
4.25 to 4.50
0 to +70
8-Plastic DIP
ASM692ACPA
ASM692ACSA
4.25 to 4.50
0 to +70
8-SO
ASM692ACSA
ASM692AEPA
4.25 to 4.50
-40 to +85
8-Plastic DIP
ASM692AEPA
ASM692AESA
4.25 to 4.50
-40 to +85
8-SO
ASM692AESA
ASM802LCPA
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM802LCPA
ASM802LCSA
4.5 to 4.75
0 to +70
8-SO
ASM802LCSA
ASM692A
ASM802L
ASM802LEPA
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM802LEPA
ASM802LESA
4.5 to 4.75
-40 to +85
8-SO
ASM802LESA
ASM802MCPA
4.25 to 4.50
0 to +70
8-Plastic DIP
ASM802MCPA
ASM802MCSA
4.25 to 4.50
0 to +70
8-SO
ASM802MCSA
ASM802MEPA
4.25 to 4.50
-40 to +85
8-Plastic DIP
ASM802MEPA
ASM802MESA
4.25 to 4.50
-40 to +85
8-SO
ASM802MESA
ASM805LCPA
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM805LCPA
ASM805LCSA
4.5 to 4.75
0 to +70
8-SO
ASM805LCSA
ASM802M
ASM805L
ASM805LEPA
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM805LEPA
ASM805LESA
4.5 to 4.75
-40 to +85
8-SO
ASM805LESA
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
13 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
Ordering Information - Lead Free Devices
Reset Threshold(V)
Temperature(°C)
Pins-Package
Package
Marking
ASM690ACPAF
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM690ACPAF
ASM690ACSAF
4.5 to 4.75
0 to +70
8-SO
ASM690ACSAF
ASM690AEPAF
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM690AEPAF
ASM690AESAF
4.5 to 4.75
-40 to +85
8-SO
ASM690AESAF
ASM692ACPAF
4.25 to 4.50
0 to +70
8-Plastic DIP
ASM692ACPAF
ASM692ACSAF
4.25 to 4.50
0 to +70
8-SO
ASM692ACSAF
ASM692AEPAF
4.25 to 4.50
-40 to +85
8-Plastic DIP
ASM692AEPAF
ASM692AESAF
4.25 to 4.50
-40 to +85
8-SO
ASM692AESAF
ASM802LCPAF
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM802LCPAF
ASM802LCSAF
4.5 to 4.75
0 to +70
8-SO
ASM802LCSAF
Part Number
ASM690A
ASM692A
ASM802L
ASM802LEPAF
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM802LEPAF
ASM802LESAF
4.5 to 4.75
-40 to +85
8-SO
ASM802LESAF
ASM802MCPAF
4.25 to 4.50
0 to +70
8-Plastic DIP
ASM802MCPAF
ASM802MCSAF
4.25 to 4.50
0 to +70
8-SO
ASM802MCSAF
ASM802MEPAF
4.25 to 4.50
-40 to +85
8-Plastic DIP
ASM802MEPAF
ASM802MESAF
4.25 to 4.50
-40 to +85
8-SO
ASM802MESAF
ASM805LCPAF
4.5 to 4.75
0 to +70
8-Plastic DIP
ASM805LCPAF
ASM805LCSAF
4.5 to 4.75
0 to +70
8-SO
ASM805LCSAF
ASM802M
ASM805L
ASM805LEPAF
4.5 to 4.75
-40 to +85
8-Plastic DIP
ASM805LEPAF
ASM805LESAF
4.5 to 4.75
-40 to +85
8-SO
ASM805LESAF
Notes:
• For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
• PulseCore Semiconductor's lead free parts are RoHS compliant.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice.
14 of 15
ASM690A/692A
ASM802L/802M
ASM805L
April 2008
rev 1.7
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: ASM690A / 692A
ASM802L / 802M
ASM805L
Document Version: 1.7
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µP Power Supply Supervisor With Battery Backup Switch
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