ALSC ASM690ACPA Up power supply supervisor with battery backup switch Datasheet

ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
µP Power Supply Supervisor With Battery Backup Switch
General Description
Applications
The AS690A / AS692A / AS802L / AS802M / AS805L offers
•
•
•
•
•
•
•
•
complete single chip solutions for power supply monitoring and
control battery functions in microprocessor systems. Each
device implements four functions: Reset control, watchdog
monitoring,
battery-backup
switching
and
power-failure
monitoring. In addition to microprocessor reset under power-up
and power-down conditions, these devices provide batterybackup switching to maintain control in power loss and brownout situations. Additional monitoring capabilities can provide an
early warning of unregulated power supply loss before the
Embedded control systems
Portable/Battery operated systems
Intelligent instruments
Wireless instruments
Wireless communication systems
PDAs and hand-held equipments
µP / µC power supply monitoring
Safety system
Typical Operating Circuit
Unregulated DC
voltage regulator drops out. The important features of these
Regulated +5V
four functions are:
•
•
•
1.6 second watchdog timer to keep microprocessor
responsive
4.40V or 4.65V VCC threshold for microprocessor reset at
R2
power-up and power-down
SPDT (Single-pole, Double-throw) PMOS switch connects
backup power to RAM if VCC fails
+
_
3.6 V
Lithium
Battery
RESET
RESET
PFI
PFO
NMI
VBATT
WDI
I/O LINE
VOUT
GND
GND
BUS
•
VCC
VCC
0.1 µF
R1
ASM690A
1.25V threshold detector for power loss or general purpose
voltage monitoring
VCC
These features are pin-compatible with the industry standard
GND
power-supply supervisors. Short-circuit and thermal protection
have also been added. The AS690A / AS802L /
AS805L
generate a reset pulse when the supply voltage drops below
4.65V and the AS692A / AS802M
Block Diagram
generate a reset below
4.40V. The ASM802L / ASM802M have power-fail accuracy to
± 2%. The ASM805L is the same as the ASM690A except that
RESET is provided instead of RESET.
VBATT
VCC
8
VOUT
Reset
Generator
7
RESET
(RESET)
+
|+
Two precision supply-voltage monitor options
•4.65V (AS690A / AS802L / AS805L)
Battery-backup power switch on-chip
Watchdog timer: 1.6 second timeout
Power failure / low battery detection
Short circuit protection and thermal limiting
Small 8-pin SO package
No external components
Specified over full temperature range
-
1.25V
Watchdog
Timer
3.5V
|+
•4.40V (AS692A / AS802M )
•
•
•
•
•
•
•
1
Battery-Switchover Circuit
2
Features
•
CMOS
RAM
WDI
6
+
|+
+
0.8V
PFI
1.25V
|+
4
+
ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)
3
GND
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
5
PFO
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Pin Configuration
Plastic/CerDip/SO
VOUT
1
VCC
2
GND
3
PFI
4
ASM690A
ASM692A
ASM802L
ASM802M
(ASM805L)
8
VBATT
7
RESET (RESET)
6
WDI
5
PFO
Pin Description
Pin Number
ASM690A /
ASM692A
ASM802L /
ASM802M
Name
Function
ASM805L
Voltage supply for RAM. When VCC is above the reset threshold, VOUT connects to
1
1
VOUT
VCC through a P-Channel MOS device. If VCC falls below the 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
4
4
PFI
Power failure monitor input. PFI is connected to the internal power fail 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
PFO
Power-fail output. PFO is active LOW whenever the PFI pin is less than 1.25V.
WDI
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 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.
6
6
Active-LOW reset output. When triggered by VCC falling below the reset threshold
7
-
RESET
or by watchdog timer timeout, RESET (or RESET) pulses low for the reset pulse
width tRS, typically 200ms. It will remain low if VCC is below the 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 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Detailed Description
Application Information
It is important to initialize a microprocessor to a known state
Microprocessor Interface
in response to specific events that could create code
The ASM690 has logic-LOW RESET output while the
execution errors and “lock-up”. The reset output of these
ASM805 has an inverted logic-HIGH RESET output.
supervisory circuits send a reset pulse to the microprocessor
Microprocessors with bidirectional reset pins can pose a
in response to power-up, power-down/power-loss or a
problem when the supervisory circuit and the microprocessor
watchdog time-out.
output pins attempt to go to opposite logic states. The
problem can be resolved by placing a 4.7kΩ resistor between
RESET/RESET Timing
the RESET output and the microprocessor reset pin. This is
Power-up reset occurs when a rising VCC reaches the reset
threshold, VRT, forcing a reset condition in which the reset
shown in Figure 2. Since the series resistor limits drive
capabilities, the reset signal to other devices should be
output is asserted in the appropriate logic state for the
buffered.
duration of tRS. The reset pulse width, tRS, is typically around
200ms and is LOW for the ASM690A, 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 these
devices 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.
Figure 1: RESET/RESET Timing
Watchdog Timer
A Watchdog time-out reset occurs when a logic “1” or logic
BUF
“0” is continuously applied to the WDI pin for more than 1.6
Buffered
RESET
seconds. After the duration of the reset interval, the watchdog
timer starts a new 1.6 second timing interval; the
VCC
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).
VCC
4.7K Ω
Power Supply
RESET
RESET
ASM690A
GND
GND
Bi-directional I/O pin
Figure 2: Interfacing with bi-directional
microprocessor reset inputs
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
3 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Watchdog Input
As discussed in the Reset section, the Watchdog input is
VBATT
VCC
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
SW1 SW2
(minimum tWD + tRS), a reset pulse will be asserted to return
the microprocessor to the initial start-up state. Pulses as
ASM690A
ASM692A
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
SW3 SW4
ASM805L
D3
ASM802L
placed into a high-impedance state to allow the pin to float.
D2
D1
ASM802M
VOUT
Backup-Battery Switchover
A power loss can be made less severe if the system RAM
contents are preserved. This is achieved in the ASM690/692/
Figure 3: Internal device configuration of battery
switch-over function
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
Table 1. Pin Connections in Battery Backup Mode
Pin
VOUT
Connection
Connected to VBATT through internal PMOS
switch
the voltage at VBATT. It should be noted that an internal
VBATT
device diode (D1 in Figure 3) will be forward biased if VBATT
exceeds VCC by more than a diode drop when VCC is
PFI
Disabled
PFO
Logic-LOW
switched to VOUT. Because of this it is recommended that
VBATT be no greater than VRT +0.6V.
RESET
WDI
Condition
SW1/SW2
SW3/SW4
VCC > Reset Threshold
open
closed
open
closed
closed
open
VCC < Reset Threshold
VCC > VBATT
VCC < Reset Threshold
VCC < VBATT
ASM690A/802A/805L Reset Threshold = 4.65V
ASM692A /ASM802M Reset Threshold = 4.4V
Connected to VOUT
Logic-LOW (except on ASM805 where it is
HIGH)
Watchdog timer disabled
During the backup power mode, the internal circuitry of the
supervisory circuit draws power from the battery supply.
While VCC is still alive, the comparator circuits 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 comparator and WDI
comparator will shut off, reducing the quiescent current drawn
by the IC to less than 1µA.
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
4 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Backup Power Sources - Batteries
diode-resistor pair clamps the capacitor voltage at one diode
Battery voltage selection is important to insure that the
drop below VCC. VCC itself should be regulated within ±5% of
battery does not discharge through the parasitic device diode
5V for the ASM692A/802M or within ±10% of 5V for the
D1 (see Figure 3) when VCC is less than VBATT and VCC >
ASM690A/802L/805L to insure that the storage capacitor
VRT.
does not achieve an over voltage state.
Table 2: Maximum Battery Voltages
Note: SuperCapTM is a trademark of Baknor Industries
Part Number
MAXIMUM Battery Voltage
ASM690A
4.80
ASM802L
4.80
ASM805L
4.80
ASM692A
4.55
ASM802M
4.55
+5V
To SRAM
VOUT
VCC
D1
VBATT
+
0.1F
Although most batteries that meet the requirements of Table
To µP
RESET
(RESET)
ASM692A
ASM802M
GND
2 are acceptable, lithium batteries are very effective backup
source due to their high-energy density and very low selfdischarge rates.
Figure 4: Capacitor as a backup power source
Battery replacement while Powered
Batteries can be replaced even when the device is in a
+5V
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.
VOUT
VCC
D1
D2
VBATT
Backup Power Sources - SuperCap™
Capacitor storage, with very high values of capacitance, can
be used as a back-up power source instead of batteries.
100K
+
0.1F
RESET
(RESET)
To SRAM
To µP
ASM692A
ASM802M
SuperCap™ are capacitors with capacities in the fractional
GND
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
Figure 5: Capacitor as a backup power source
Voltage clamped to 0.5V below VCC
occur since the capacitor will ultimately charge up to VCC. To
insure that an over voltage condition does not occur, the
circuit of Figure 5 is preferred. In this circuit configuration, the
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
5 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Operation without a Backup Power Source
Power Fail Hysteresis
When operating without a back-up power source, the VBATT
A noise margin can be added to the simple monitoring circuit
pin should be connected to GND and VOUT should be
of Figure 6 by adding positive feedback from the PFO pin.
connected to VCC, since power source switchover will not
The circuit of Figure 7 adds this positive “latching” effect by
occur. Connecting VOUT to VCC eliminates the voltage drop
due to the ON-resistance of the PMOS switch.
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
Power-Fail Comparator
The Power Fail feature is an independent voltage monitoring
function that can be used for any number of monitoring
activities. The PFI function can provide an early sensing of
power supply failure by sensing the voltage of the
unregulated DC ahead of the regulated supply sensing seen
by the backup-battery switchover circuitry. The PFI pin is
the hysteresis band reasonable and should be larger than
10kΩ to avoid excessive loading on the PFO pin. The
calculations for the correct values of resistors to set the
hysteresis thresholds are given in Figure 7. A capacitor can
be added to offer additional noise rejection by low-pass
filtering.
compared to a 1.25V internal reference. If the voltage at the
PFI pin is less than this reference voltage, the PFO pin goes
VIN
+5V
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
VCC
R1
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
input voltage at the PFI pin results from a simple resistor
PFI
voltage divider as shown in Figure 6.
R2
VIN
C1*
+5V
PFO
VCC
R1
R3
GND
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
PFO
PFI
R2
+5V
PFO
0V
GND
V
A
B
0V
5R 2
A = -------------------- < 1.25V
R +R
1
2
VL VTRIP VH
0V
+5V
PFO
* Optional
To µP
5R
2
B = -------------------- > 1.25V
R1 + R2
1.25
TRIP = ------------------------⎛ R2 ⎞
⎜ --------------------⎟
⎝ R 2 + R 2⎠
1.25
V H = -----------------------------------||
R
2 R3 ⎞
⎛ ----------------------------⎝ R 1 + R 2 || R 3⎠
V L – 1.25 5 – 1.25
1.25----------------------- + ------------------- = --------R1
R3
R2
Figure 6: Simple Voltage divider sets PFI trip point
Figure 7: Hysterisis Added To PFI Pin
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
6 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
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
+5V
can be scaled by means of a resistive divider. An example is
ASM690A
VCC ASM692A
the negative power supply monitor configured in Figure 8. In
this case a good negative supply will hold the PFI pin below
R1
1.25V and the PFO pin will be at logic “0”. As the negative
ASM802L
ASM802M
PFI ASM805L PFO
voltage declines, the voltage at the PFI pin will rise until it
exceeds 1.25V and the PFO pin will go to logic “1”.
R2
GND
V-
V- = VTRIP
+5V
PFO
0V
VTRIP
V-
0V
1.25 – V TRIP
5-----------------– 1.25= ------------------------------R2
R1
Figure 8: Using PFI To Monitor Negative Supply Voltage
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
7 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Absolute Maximum Ratings
Parameter
Min
Max
Unit
VCC
-0.3
6.0
V
VBATT
-0.3
6.0
V
All other inputs *
-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
CerDIP (derate 8mW/°C above 70°C)
650
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
Lead Temperature Soldering, (10 sec)
* 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 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
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
Symbol
VCC, VBATT Voltage
Range (Note 1)
Supply Current
Excluding IOUT
IS
Conditions
Min
1.1
5.5
ASM805LC
1.1
5.5
ASM69_AE, ASM80__E
1.1
5.5
ASM69_AC, ASM80__E
35
100
ASM69_AC, ASM802_C
35
100
TA = 25°C
VCC = 0V, VBATT=2.8V
VBATT Standby
5.5V>VCC>VBATT-0.2V
Current (Note 2)
TA = TMIN to TMAX
TA = 25°C
TA = TMIN to TMAX
VOUT in Battery
Backup Mode
Battery Switch
Threshold,
VCC to VBATT
-0.1
-1.0
VCC-
IOUT = 5mA
VOUT Output
0.025
Unit
V
µA
1.0
5.0
µA
0.02
0.02
µA
VCC-0.010
V
IOUT = 50mA
VCC-0.25
VCC-0.10
IOUT=250µA, VCC < VBATT-0.2V
VBATT-0.1
VBATT-0.001
V
20
-20
mV
40
mV
VCC < VRT
Power Up
Power Down
Battery Switch over
Hysteresis
VRT
Max
ASM69_AC, ASM802_C
ISUPPLY in Battery
Backup Mode
(Excluding IOUT)
Reset Threshold
Typ
ASM690A/802L/805L
4.50
4.65
4.75
ASM692A, ASM802M
4.25
4.40
4.50
ASM802L, TA = 25°C, VCC falling
4.55
4.70
ASM802M, TA=25°C, VCC falling
4.30
4.45
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
9 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Parameter
Symbol
Conditions
Min
Reset Threshold
Hysteresis
Reset Pulse Width
Typ
40
tRS
140
ISOURCE = 800µA
200
ASM69_AE, ASM802_E, VCC=1.2V,
0.3
ISINK=100µA
ASM805LC, ISOURCE=4µA, VCC = 1.1V
0.8
ASM805LE, ISOURCE=4µA, VCC = 1.2V
0.9
tWD
WDI Pulse Width
tWP
WDI Input Threshold
(Note 3)
PFI Input Threshold
2.25
50
-150
150
-50
µA
µA
0.8
ASM69_A,ASM805L, VCC = 5V
1.20
1.25
1.30
ASM802_C/E, VCC = 5V
1.225
1.250
1.275
-25
0.01
25
ISOURCE = 800µA
sec
ns
VCC = 5V, Logic LOW
PFI Input Current
PFO Output Voltage
1.60
50
WDI = VCC
WDI = 0V
V
0.4
1.00
VIL = 0.4V, VIH = 0.8VCC
ms
VCC - 1.5
ASM805L, ISINK=3.2mA
Watchdog Timeout
280
0.3
ISINK=50µA
ASM805L, ISOURCE=800µA
mV
0.4
ASM69_AC, ASM802_C, VCC=1.0V,
Reset Output Voltage
Unit
VCC - 1.5
ISINK = 3.2mA
WDI Input Current
Max
V
V
VCC - 1.5
ISINK = 3.2mA
nA
V
0.4
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 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Plastic DIP (8-Pin)
Package Information
Inches
Min
Millimeters
Max
Min
Max
Plastic DIP (8-Pin) *
CerDIP (8-Pin)
A
-
0.210
-
5.33
A1
0.015
-
0.38
-
A2
0.115
0.195
2.92
4.95
b
0.014
0.022
0.36
0.56
b2
0.045
0.070
1.14
1.78
b3
0.030
0.045
0.80
1.14
D
0.355
0.400
0.80
1.14
D1
0.005
-
0.13
-
E
0.300
0.325
7.62
8.26
E1
0.240
0.280
6.10
e
0.100
-
2.54
eA
0.300
-
7.62
eB
-
0.430
eC
-
0.060
L
0.115
0.150
7.11
-
10.92
2.92
3.81
CerDIP (8-Pin)
SO (8-Pin)
A
-
0.200
-
5.08
A1
0.015
0.070
0.38
1.78
b
0.014
0.023
0.36
0.58
B2
0.038
0.065
0.97
1.65
C
0.008
0.015
0.20
0.38
D
-
0.405
-
10.29
D1
0.005
-
0.13
-
E
0.290
0.320
7.37
8.13
E1
0.220
0.310
5.59
7.87
e
0.100
L
0.125
A
0.053
A1
B
2.54
0.200
3.18
5.08
0.069
1.35
1.75
0.004
0.010
0.10
0.25
0.013
0.020
0.33
0.51
C
0.007
0.010
0.19
0.25
SO (8-Pin) **
e
0.050
E
0.150
0.157
1.27
3.80
4.00
H
0.228
0.244
5.80
6.20
L
0.016
0.050
0.40
1.27
D
0.189
0.197
4.80
5.00
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
11 of 13
ASM690A / 692A
ASM802L / 802M
ASM805L
October 2003
rev 1.0
Ordering Information
Part Number
Reset Threshold (V)
Temperature Range (°C)
Pins-Package
ASM690ACPA
4.5 TO 4.75
0 TO +70
8-Plastic DIP
ASM690ACSA
4.5 TO 4.75
0 TO +70
8-SO
ASM690AC/D
4.5 TO 4.75
25
DICE
-40 TO +85
8-Plastic DIP
ASM690A
ASM690AEPA
ASM690AESA
4.5 TO 4.75
-40 TO +85
8-SO
ASM690AMJA
4.5 TO 4.75
Contact Factory
8-Cer DIP
ASM692ACPA
4.25 TO 4.50
0 TO +70
8-Plastic DIP
ASM692ACSA
4.25 TO 4.50
0 TO +70
8-SO
ASM692AC/D
4.25 TO 4.50
25
DICE
ASM692AEPA
4.25 TO 4.50
-40 TO +85
8-Plastic DIP
ASM692AESA
4.25 TO 4.50
-40 TO +85
8-SO
ASM692AMJA
4.25 TO 4.50
Contact Factory
8-Cer DIP
ASM802LCPA
4.5 TO 4.75
0 TO +70
8-Plastic DIP
ASM802LCSA
4.5 TO 4.75
0 TO +70
8-SO
ASM802LAEPA
4.5 TO 4.75
-40 TO +85
8-Plastic DIP
ASM802LESA
4.5 TO 4.75
-40 TO +85
8-SO
ASM802MCPA
4.25 TO 4.50
0 TO +70
8-Plastic DIP
ASM802MCSA
4.25 TO 4.50
0 TO +70
8-SO
ASM802MEPA
4.25 TO 4.50
-40 TO +85
8-Plastic DIP
ASM802MESA
4.25 TO 4.50
-40 TO +85
8-SO
ASM805LCPA
4.5 TO 4.75
0 TO +70
8-Plastic DIP
ASM805LCSA
4.5 TO 4.75
0 TO +70
8-SO
ASM805LC/D
4.5 TO 4.75
25
DICE
ASM805LEPA
4.5 TO 4.75
-40 TO +85
8-Plastic DIP
ASM805LESA
4.5 TO 4.75
-40 TO +85
8-SO
ASM805LMJA
4.5 TO 4.75
Contact Factory
8-Cer DIP
ASM692A
ASM802L
ASM802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
Notice: The information in this document is subject to change without notice
12 of 13
October 2003
ASM690A / 692A
ASM802L / 802M
ASM805L
rev 1.0
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM690A / 692A
ASM802L / 802M
ASM805L
Document Version: 1.0
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or
registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the
right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may
appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the
right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these
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parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may
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the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
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