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
rev 1.6 µP Power Supply Supervisor With Battery Backup Switch
ASM690A / 692A
ASM802L / 802M
ASM805L
March 2005
General Description
The ASM690A / ASM692A / ASM802L / ASM802M / ASM805L
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
battery-backup switching to maintain control in power loss and
brown-out situations. Additional monitoring capabilities can
provide an early warning of unregulated power supply loss
before the voltage regulator drops out. The important features
of these four functions are:
• 1.6 second watchdog timer to keep microprocessor
responsive
• 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 adde d. 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 / ASM802M have power-fail accuracy to
± 2%. The ASM805L is the same as the ASM690A except th at
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 sw itch on-chip
• Watchdog timer: 1.6 second timeout
• Power failure / low battery detection
• Short circuit protection and thermal limiting
• Small 8-pin SO and 8-pin PDIP packages
• No external components
• Specified over full temperature range
Applications
• 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
Block Diagram
BUS
+
_
R1
R2
0.1 µF
3.6 V
Lithium
Battery
ASM690A
Regulated +5V
Unregulated DC
VBATT
GND VOUT
WDI
PFO
PFI
RESET
VCC VCC
RESET
GND
GND
NMI
I/O LINE
VCC
CMOS
RAM
Battery-Switchover Circuit
Reset
Generator
Watchdog
Timer
VBATT
VCC
WDI
PFI
VOUT
RESET
(RESET)
PFO
1.25V
3.5V
0.8V 1.25V
GND
1
2
3
4
5
6
7
8
|+
|+
|+
|+ -
+
-
+
-
+
-
+
ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)
Battery-Switchover Circuit
Reset
Generator
Watchdog
Timer
VBATT
VCC
WDI
PFI
VOUT
RESET
(RESET)
PFO
1.25V
3.5V
0.8V 1.25V
1
2
4
5
6
7
8
|+
|+
|+
|+ -
+
-
+
-
+
-
+
2 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Pin Configuration
1
2
3
45
6
7
8
VOUT
VCC
GND
PFI
VBATT
RESET (RESET)
WDI
PFO
PDIP/SO
ASM690A
ASM692A
ASM802L
ASM802M
(ASM805L)
Pin Description
Pin Number
Name Function
ASM690A /
ASM692A
ASM802L /
ASM802M
ASM805L
11
VOUT
Volt age 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 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.
22
VCC +5V power supply input.
3 3 GND Ground
44PFI
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.
55PFO
Power-fail output. PFO is active LOW whenever the PFI pin is less than 1.25V.
66WDI
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.
7 - RESET
Active-LOW reset output. When triggered by VCC falling below the reset threshold
or by watchdog timer timeout, RESET pulses low for the reset pulse width tRS, typ-
ically 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 Active-HIGH reset output. The inverse of RESET.
88
VBATT
Auxiliary power or backup-battery input. VBATT should be connected to GND if the
function is not used. The input has about 40 mV of hysteresis to prevent rapid tog-
gling between VCC and VBATT.
3 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Detailed Description
It is important to initialize a microprocessor to a known state
in response to specific events that could create code
execution errors and “lock-up”. The reset output of these
supervisory circuits send a reset pulse to the microprocessor
in response to power-up, power-down/power-loss or a
watchdog time-out.
RESET/RESET Timing
Power-up reset occurs when a rising VCC reaches the reset
threshold, VRT, forcing a reset condition in which the reset
output is asserted in the appropriate logic state for the
duration of tRS. The reset pulse width, tRS, is typical ly 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 lon g 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/ASM80 2
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).
Application Information
Microprocessor Interfac e
The ASM690 has logic-LOW RESET output while the
ASM805 has an inverted logic-HIGH RESET output.
Microprocessors with bidirectional reset pins can pose a
problem when the supervisory circuit and the microprocesso r
output pins attempt to go to opposite logic states. The
problem can be resolved by placing a 4.7kΩ resistor between
the RESET output and the microprocessor reset pin. This is
shown in Figure 2. Since the series resistor limits drive
capabilities, the reset signal to other devices should be
buffered.
Figure 2: Interfacing with bi-directional
microprocessor reset inputs
V
CC
RESET
RESET
GND
GND
V
CC
ASM690A
Power Supply
Bi-directional I/O pin
RESET
Buffered
BUF
4.7K
Ω
Figure 1: RESET/RESET Timing
( ) ASM805L VBAT=PFI=3V
IOUT=0mA
4 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
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 e very 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 appli ed to the WDI pin. If this feature is
not used, the WDI pin should be open circuited or the logic
placed into a high-impedance state to allow the pin to float.
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/
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 bo th 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 voltage at VBATT. It should be noted that an internal
device diode (D1 in F igure 3) will be forward biased if VBATT
exceeds VCC by more than a diode drop when VCC is
switched to VOUT. Because of this it is recommended that
VBATT be no greater than VRT +0.6V.
Table 1. Pin Connections in Batter y Backup Mode
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 th e device is typically 35µA. When
VCC drops more than 1.1V below VBATT, the internal
switchover comparator, the PFI comparator and WDI
compar ator will shut of f, reduci ng the quiescent current drawn
by the IC to less than 1µA.
Condition SW1/SW2 SW3/SW4
VCC > Reset Threshold open closed
VCC < Reset Threshold
VCC > VBATT open closed
VCC < Reset Threshold
VCC < VBATT closed open
ASM690A/802A/805L Reset Threshold = 4.65V
ASM692A /ASM802M Reset Threshold = 4.4V
Pin Connection
VOUT Connected to VBATT through internal PMOS
switch
VBATT Connected to VOUT
PFI Disabled
PFO Logic-LOW
RESET Logic-LOW (except on ASM805 where it is
HIGH)
WDI Watchdog timer disabled
SW1 SW2 D1 D2 SW3 SW4
D3
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
VOUT
VCC
VBATT
Figure 3: Internal device configuration of battery
switch-over function
5 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Backup Power Sources - Batteries
Battery voltage selection is important to insure that the
battery does not discharge through the parasitic device diode
D1 (see Figure 3) when VCC is less than VBATT and VCC >
VRT.
Table 2: Maximum Ba tte r y Voltages
Although most batteries that meet the requirements of Table
2 are acceptable, lithium batteries are very effective backup
source due to their high-energy density and very low self-
discharge 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 Super Cap™ 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 conne ct the SuperCap™, this
circuit cannot insure that an over voltage condition will not
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
diode-resistor pair clamps the capacitor voltage at one diode
drop below VCC. VCC itself should be regulated within ±5% of
5V for the ASM692A/802M or within ±10% of 5V for the
ASM690A/802L/805L to insure that the storage capacitor
does not achieve an over voltage state.
Note: SuperCapTM is a trademark of Baknor Industries
Part Number MAXIMUM Battery Voltage (V)
ASM690A 4.80
ASM802L 4.80
ASM805L 4.80
ASM692A 4.55
ASM802M 4.55
100K ASM692A
ASM802M
VCC VOUT
VBATT RESET
(RESET)
GND
To µP
+
0.1F
Figure 5: Capacitor as a backup power source
Voltage clamped to 0.5V below VCC
VCC VOUT
VBATT RESET
(RESET)
GND
To µP
+5V
0.1F
+
Figure 4: Capacitor as a backup power source
D2
D1
To SRAM
D1
ASM692A
ASM802M
To SRAM
+5V
6 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Operation without a Backup Powe r Source
When operating without a back-up power source, the VBATT
pin should be connected to GND and VOUT should be
connected to VCC, since power source switchover will not
occur. Connecting VOUT to VCC eliminates the voltage drop
due to the ON-resistance of the PMOS switch.
Power-Fail Comparator
The Power Fail feature is an independent vo ltage 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
compared to a 1.25V internal reference. If the voltage at the
PFI pin is less than this reference voltage, the PF O 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 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.
V
CC
PFI PFO
GND
R1
R2
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
AB
+5V
PFO
0V
A5R2
R1R2
+
--------------------1.25V<=B5R2
R1R2
+
--------------------1.25V>=
Figure 6: Simple Voltage divider sets PFI trip point
+5V
VIN
VCC
PFI
PFO
GND
+5V
R3
R2
R1
VIN
To µP
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
C1*
* Optional
+5V
PFO
0V
0V VLVH
VTRIP
Figure 7: Hysterisis Added To PFI Pin
VTRIP 1.25
R2
R1R2
+
------------------
⎝⎠
⎜⎟
⎛⎞
------------------------=VH1.25
R2R3
||
R1R2R3
||
+
------------------------------
⎝⎠
⎛⎞
------------------------------------=
VL1.25–
R1
-----------------------51.25–
R3
-------------------+1.25
R2
----------=
7 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Monitoring Capabilit ies Of The Power-fail Input:
Although designed for power supply failure monitoring, the
PFI pin can be used for mo nitoring any voltage conditi on that
can be scaled b y means of a resisti ve 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 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”.
VCC
PFI
GND
R1
R2
V- V- = VTRIP
PFO
+5V
ASM690A
ASM692A
ASM802L
ASM802M
ASM805L
+5V
PFO
0V
VTRIP
V-
0V
51.25–
R1
------------------- 1.25 VTRIP
–
R2
-------------------------------=
Figure 8: Using PFI To Monitor Negative Supply Voltage
8 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Absolute Maximum Ratings
Parameter Min Max Unit
Pin Terminal Volta ge with Resp e ct to Ground
VCC -0.3 6.0 V
VBATT -0.3 6.0 V
All other inputs * -0.3 VCC + 0.3 V
Input Curren t at VCC 200 mA
Input Curren t at VBATT 50 mA
Input Current at GND 20 mA
Output Current
VOUT Short circuit protected
All other inputs 20 mA
Rate of Rise: VBATT and VCC 100 V/µs
Continuous Power Dissipation
Plastic DIP (derate 9mW/°C above 70°C) 800 mW
SO (derate 5.9mW/°C above 70°C) 500 mW
Operating Temperature Range (C Devices) 0 70 °C
Operating Temperature Range (E Devices) -40 85 °C
Storage Temperature Range -65 160 °C
Lead Temperature (Soldering, 10 sec) 300 °C
ESD rating HBM
MM 1
100 KV
V
* 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.
9 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
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 Conditions Min Typ Max Unit
VCC, VBATT V oltage
Range (Note 1) 1.1 5.5 V
Supply Current
Excluding IOUT IS35 100 µA
ISUPPLY in Battery
Backup Mode
(Excluding IOUT)VCC = 0V, VBATT = 2.8V
TA = 25°C 1.5
µA
TA = TMIN to TMAX 5.0
VBATT Standby
Current (Not e 2 ) 5.5V>VCC>VBATT + 0.2V TA = 25°C
TA = TMIN to TMAX
-0.1
-1.0 0.02
0.02 µA
VOUT Output IOUT = 5mA VCC-0.025 VCC-0.010 V
IOUT = 50mA VCC-0.25 VCC-0.10
VOUT in Battery
Backup Mode IOUT=250µA, VCC < VBATT - 0.2V VBATT - 0.1 VBATT - 0.001 V
Battery Switch
Threshold,
VCC to VBATT
VCC < VRT Po we r Up
Power Down 20
-20 mV
Battery Switch over
Hysteresis 40 mV
Reset Threshold VRT
ASM690A/802L/805L 4.50 4.65 4.75
V
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
Reset Threshold
Hysteresis 40 mV
Reset Pulse Width tRS 140 200 280 ms
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.
10 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Reset Output Volt-
age
ISOURCE = 800µA VCC - 1.5
V
ISINK = 3.2mA 0.4
ASM69_AC, ASM802_C, VCC=1.0V,
ISINK=50µA 0.3
ASM69_AE, ASM802_E, VCC=1.2V,
ISINK=100µA 0.3
ASM805LC, ISOURCE=4µA, VCC = 1.1V 0.8
ASM805LE, ISOURCE=4µA, VCC = 1.2V 0.9
ASM805L, ISOURCE=800µA VCC - 1.5
ASM805L, ISINK=3.2mA 0.4
Watchdog Timeout tWD 1.00 1.60 2.25 sec
WDI Pulse Width tWP VIL = 0.4V, VIH = 0.8VCC 50 ns
WDI Input Current WDI = VCC 50 150 µA
WDI = 0V -150 -50 µA
WDI Input Threshold
(Note 3)
VCC = 5V, Logic LOW 0.8 V
VCC = 5V, Logic HIGH 3.5
PFI Input Threshold ASM69_A ,ASM805L, VCC = 5V 1.20 1.25 1.30 V
ASM802_C/E, VCC = 5V 1.225 1.250 1.275
PFI Input Current -25 0.01 25 nA
PFO Output Voltage ISOURCE = 800µA VCC - 1.5 V
ISINK = 3.2mA 0.4
Parameter Symbol Conditions Min Typ Max Unit
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.
11 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Package Information
8-lead PDIP Package
Symbol Dimensions
Inches Millimeters
Min Max Min Max
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
C 0.008 0.014 0.20 0.36
D 0.355 0.400 9.02 10.16
E 0.300 0.325 7.62 8.26
E1 0.240 0.280 6.10 7.11
e 0.10 BSC 2.54 BSC
eB 0.430 10.92
L 0.115 0.150 2.92 3.81
12 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
8-lead (150-mil) SOIC Package
Symbol
Dimensions
Inches Millimeters
Min Max Min Max
A1 0.004 0.010 0.10 0.25
A 0.053 0.069 1.35 1.75
A2 0.049 0.059 1.25 1.50
B 0.012 0.020 0.31 0.51
C 0.007 0.010 0.18 0.25
D 0.193 BSC 4.90 BSC
E 0.154 BSC 3.91 BSC
e 0.050 BSC 1.27 BSC
H 0.236 BSC 6.00 BSC
L 0.016 0.050 0.41 1.27
θ0° 8° 0° 8°
D
EH
D
A1
A2
A
θ
L
C
B
e
13 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Ordering Information - Tin - Lead Devices
Part Number Reset Threshold (V) Temperature Range (°C) Pins-Package Package Marking
ASM690A
ASM690ACPA 4.5 TO 4.75 0 TO +70 8-Plasti c DIP ASM690ACPA
ASM690ACSA 4.5 TO 4.75 0 TO +70 8-SO ASM690ACSA
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
ASM692A
ASM692ACPA 4.25 T O 4.50 0 TO +70 8-Plastic DIP ASM692ACPA
ASM692ACSA 4.25 TO 4.50 0 TO +70 8-SO ASM692AC S A
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
ASM802L
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
ASM802LEPA 4.5 TO 4.75 -40 TO +85 8-Plasti c DIP ASM802LEPA
ASM802LESA 4.5 TO 4.75 -40 TO +85 8-SO ASM802LESA
ASM802M
ASM802MCPA 4.25 TO 4.50 0 TO +70 8-Plastic DIP ASM802MCPA
ASM802MCSA 4.25 T O 4.50 0 TO +70 8-SO ASM80 2 M C SA
ASM802MEPA 4.25 TO 4.50 -40 TO +85 8-Plastic DIP ASM802MEPA
ASM802MESA 4.25 T O 4. 50 -40 TO +85 8-SO ASM802MESA
ASM805L
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
ASM805LEPA 4.5 TO 4.75 -40 TO +85 8-Plasti c DIP ASM805LEPA
ASM805LESA 4.5 TO 4.75 -40 TO +85 8-SO ASM805LESA
14 of 15
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
rev 1.6
March 2005
Ordering Information - Lead Free Devices
Notes:
• For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
• Alliance Semiconductor's lead free parts are RoHS compliant.
Part Number Reset Threshold (V) Temperature Range (°C) Pins-Package Package Marking
ASM690A
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
ASM692A
ASM692ACPAF 4.25 TO 4. 50 0 TO +70 8-Plastic DIP ASM692ACPAF
ASM692ACSAF 4.25 T O 4. 50 0 TO +70 8-SO ASM692ACSAF
ASM692AEPAF 4.25 T O 4.50 -40 TO +85 8-Plastic DIP ASM692AEPAF
ASM692AESAF 4.25 TO 4.50 -40 TO +85 8-SO ASM692AESAF
ASM802L
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
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
ASM802M
ASM802MCPAF 4.25 TO 4.50 0 T O +7 0 8-Plastic DIP ASM802MCPAF
ASM802MCSAF 4.25 T O 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
ASM805L
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
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
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: 1.6
© 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
specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and
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or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale
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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
reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that
the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
ASM690A / 692A
ASM802L / 802M
ASM805L
March 2005
rev 1.6
