Datasheet ASM690A, ASM692A, ASM802L, ASM802M, ASM805L Datasheet (Alliance Semiconductor)

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October 2003

ASM690A / 692A
ASM802L / 802M

ASM805L

rev 1.0

µP Power Supply Supervisor With Battery Backup Switch

General Description

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 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 V

threshold for microprocessor reset at

CC

power-up and power-down

• SPDT (Single-pole, Double-throw) PMOS switch connects
backup power to RAM if V

CC

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 AS690A / AS802L / AS805L

generate a reset pulse when the supply voltage drops below

4.65V and the AS692A / AS802M 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

.

Features

• Two precision supply-voltage monitor options

•4.65V (AS690A / AS802L / AS805L)

•4.40V (AS692A / AS802M )

• 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

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

Unregulated DC

R

R

0.1 µF

1

2

+

3.6 V

_

Lithium

Battery

PFI

V

BATT

GND

ASM690A

Regulated +5V

V

CC

RESET

PFO

WDI

V

OUT

Block Diagram

8

V

V

BATT

BATT

V

V

WDI

WDI

PFI

PFI

8

2

2

CC

CC

6

6

4

4

ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)

Battery-Switchover Circuit

Battery-Switchover Circuit

+

+

|+

|+

-

-

1.25V

1.25V

3.5V

3.5V

+

+

|+

|+

-

-

-

-

|+

|+

+

+

0.8V

0.8V

3

GND

Reset

Reset

Generator

Generator

Watchdog

Watchdog

Timer

Timer

1.25V

1.25V

|+

|+

RESET

NMI

I/O LINE

GND

V

CC

GND

-

-

+

+

V

CC

CMOS

RAM

1

1

7

7

5

5

BUS

V

V

OUT

OUT

RESET

RESET

(RESET)

(RESET)

PFO

PFO

Alliance Semiconductor

2575 Augustine Drive . Santa Clara, CA 95054 . Tel: [phone] . Fax: [phone] . www.alsc.com

Notice: The information in this document is subject to change without notice

ASM690A / 692A
ASM802L / 802M

October 2003

rev 1.0

Pin Configuration

Pin Description

Pin Number

ASM690A /

ASM692A

ASM802L /

ASM802M

11

ASM805L

Plastic/CerDip/SO

V

OUT

V

CC

GND

PFI

Name Function

Voltage supply for RAM. When VCC is above the reset threshold, V

V

OUT

V

output will be connected to the backup supply at V

higher) through the MOS switch to provide continuous power to the CMOS RAM.

ASM690A

1

ASM692A

2

ASM802L

3

ASM802M

4

(ASM805L)

through a P-Channel MOS device. If VCC falls below the reset threshold, this

CC

V

8

BATT

7

RESET (RESET)

6

WDI

PFO

5

ASM805L

OUT

(or VCC, whichever is

BATT

connects to

22

3 3 GND Ground

44PFI

55PFO

66WDI

7 - RESET

- 7 RESET Active-HIGH reset output. The inverse of RESET

88

V

CC

V

BATT

+5V power supply input.

Power failure monitor input. PFI is connected to the internal power fail comparator
which is referenced to 1.25V. The power fail output (PFO
remains HIGH if PFI is above 1.25V. If this feature is unused, the PFI pin should be
connected to GND or V

Power-fail output. PFO is active LOW whenever the PFI pin is less than 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 or LOW for
longer than the watchdog timeout period, typically 1.6 seconds, RESET (or RESET
is asserted for the reset pulse width time, t

Active-LOW reset output. When triggered by VCC falling below the reset threshold

or by watchdog timer timeout, RESET (or RESET
width t

(4.65V in ASM690A / ASM802L and 4.4V in the ASM692A / ASM802L) and
remains low for 200ms after V

Auxiliary power or backup-battery input. V

function is not used. The input has about 40mV of hysteresis to prevent rapid tog­gling between V

, typically 200ms. It will remain low if VCC is below the reset threshold

RS

and V

CC

OUT

.

, of 140ms, minimum.

RS

rises above the reset threshold.

CC

should be connected to GND if the

BATT

.

BATT

) is active LOW but

)

) pulses low for the reset pulse

.

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

October 2003

rev 1.0

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

Power-up reset occurs when a rising V

threshold, V

output is asserted in the appropriate logic state for the

duration of t

200ms and is LOW for the ASM690A, ASM692A, ASM802

and HIGH for the ASM805L. Figure 1 shows the reset pin

timing.

Timing

reaches the reset

CC

, forcing a reset condition in which the reset

RT

. The reset pulse width, tRS, is typically around

RS

ASM805L

Application Information

Microprocessor Interface

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 microprocessor

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.

Power-loss or “brown-out” reset occurs when V

the reset threshold resulting in a reset assertion for the

duration of t

V

is between VRT and 1.1V, the lowest VCC for which these

CC

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 V
100kΩ pull-down resistor at RESET is needed: the logic-high

ASM805L will need a pull-up resistor to V

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 t

RS. The reset signal remains asserted as long as

CC

CC

RS

dips below

CC

is under 1.1V, a

.

).

Figure 1: RESET/RESET Timing

V

CC

Power Supply

RESET

ASM690A

GND

Bi-directional I/O pin

4.7K

BUF

V

CC

Ω

RESET

GND

Buffered

RESET

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

October 2003

rev 1.0

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 t

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 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 V

power source connected at V

reset threshold voltage (V

V

. The V

BATT

2Ω PMOS switch but a brown-out or loss of VCC will cause a

switchover to V

Although both conditions (VCC < VRT and VCC <V

occur for the switchover to V

switched back to V

the voltage at V

device diode (D1 in Figure 3) will be forward biased if V

exceeds VCC by more than a diode drop when VCC is

switched to V

V

be no greater than VRT +0.6V.

BATT

+ tRS), a reset pulse will be asserted to return

WD

to an alternate

CC

when VCC is less than the

BATT

< VRT), and VCC is less than

CC

pin is normally connected to VCC through a

OUT

by means of a 20Ω PMOS switch.

BATT

BATT

to occur, V

BATT

when VCC exceeds VRT irrespective of

CC

. It should be noted that an internal

BATT

. Because of this it is recommended that

OUT

OUT

will be

) must

BATT

ASM805L

V

BATT

D2

SW2

SW1

ASM690A
ASM692A

ASM802L

ASM802M

Figure 3: Internal device configuration of battery

switch-over function

Table 1. Pin Connections in Battery Backup Mode

Pin Connection

V

OUT

V

BATT

PFI Disabled

PFO Logic-LOW

RESET

Connected to V

switch

Connected to V

Logic-LOW (except on ASM805 where it is
HIGH)

D1

ASM805L

D3

V

OUT

through internal PMOS

BATT

OUT

V

SW3

CC

SW4

Condition SW1/SW2 SW3/SW4

V

> Reset Threshold

CC

V

< Reset Threshold

CC

V

> V

CC

BATT

< Reset Threshold

V

CC

V

< V

CC

BATT

ASM690A/802A/805L Reset Threshold = 4.65V
ASM692A /ASM802M Reset Threshold = 4.4V

open closed

open closed

closed open

µP Power Supply Supervisor With Battery Backup Switch

Notice: The information in this document is subject to change without notice

WDI Watchdog timer disabled

During the backup power mode, the internal circuitry of the

supervisory circuit draws power from the battery supply.

While V

and the current drawn by the device is typically 35µA. When

V

CC

switchover comparator, the PFI comparator and WDI

comparator will shut off, reducing the quiescent current drawn

by the IC to less than 1µA.

is still alive, the comparator circuits remain alive

CC

drops more than 1.1V below V

BATT

, the internal

4 of 13

ASM690A / 692A
ASM802L / 802M

October 2003

rev 1.0

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 V

VRT.

Table 2: Maximum Battery Voltages

Part Number MAXIMUM Battery Voltage

ASM690A 4.80

ASM802L 4.80

ASM805L 4.80

ASM692A 4.55

ASM802M 4.55

Although most batteries that meet the requirements of Tab le

2 are acceptable, lithium batteries are very effective backup

source due to their high-energy density and very low self-

discharge rates.

is less than V

CC

and VCC >

BATT

ASM805L

diode-resistor pair clamps the capacitor voltage at one diode

drop below V

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: SuperCap

+5V

+

Figure 4: Capacitor as a backup power source

. VCC itself should be regulated within ±5% of

CC

TM

is a trademark of Baknor Industries

D1

0.1F

V

CC

V

BATT

ASM692A

ASM802M

GND

V

OUT

RESET

(RESET)

SRAM

To

To µP

Battery replacement while Powered

Batteries can be replaced even when the device is in a

powered state as long as V

threshold voltage VRT. In the ASM devices, a floating V

pin will not cause a powersupply switchover as can occur in

some other supervisory circuits. If V

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

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 will ultimately charge up to V

insure that an over voltage condition does not occur, the

circuit of Figure 5 is preferred. In this circuit configuration, the

™

are capacitors with capacities in the fractional

remains above the reset

CC

is not used, the pin

BATT

CC

BATT

. To

+5V

(RESET)

GND

V

OUT

RESET

V

D1

D2

100K

Figure 5: Capacitor as a backup power source

+

0.1F

Voltage clamped to 0.5V below V

CC

V

BATT

ASM692A

ASM802M

To SRAM

To µP

CC

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

October 2003

rev 1.0

Operation without a Backup Power Source

When operating without a back-up power source, the V

pin should be connected to GND and V

connected to VCC, since power source switchover will not

occur. Connecting V

due to the ON-resistance of the PMOS switch.

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

compared to a 1.25V internal reference. If the voltage at the

PFI pin is less than this reference voltage, the PFO

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.

V

IN

to VCC eliminates the voltage drop

OUT

+5V

ASM690A

R1

V

CC

ASM692A

ASM802L

ASM802M

ASM805L

should be

OUT

BATT

pin goes

ASM805L

Power Fail Hysteresis

A noise margin can be added to the simple monitoring circuit

of Figure 6 by adding positive feedback from the PFO

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

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

IN

+5V

V

R

1

CC

ASM690A
ASM692A
ASM802L

PFI

R

2

C1*

R

3

ASM802M
ASM805L

PFO

GND

To µP

* Optional

pin.

pin. The

GND

2

1.25V>=

PFO

B

A

+5V

PFO

0V

5R

--------------------

R1R2+

PFI

R2

A

5R

--------------------

2

B

1.25V<=

R1R2+

Figure 6: Simple Voltage divider sets PFI trip point

µP Power Supply Supervisor With Battery Backup Switch

Notice: The information in this document is subject to change without notice

+5V

PFO

0V

V

V

51.25–

-------------------

+

L

TRIP

------------------------------------

=

V

H

⎛⎞
⎝⎠

1.25

----------

=

R

3

R

V

0V

TRIP

1.25

-------------------------

=

R

⎛⎞

2

--------------------

⎜⎟

R2R2+

⎝⎠

V

1.25–

L

-----------------------

R

1

Figure 7: Hysterisis Added To PFI Pin

V

H

1.25

||

R

2R3

------------------------------

R

||

+

1R2R3

2

6 of 13

ASM690A / 692A
ASM802L / 802M

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

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

voltage declines, the voltage at the PFI pin will rise until it

exceeds 1.25V and the PFO

pin will be at logic “0”. As the negative

pin will go to logic “1”.

+5V

PFO

+5V

R

V-

ASM805L

ASM690A

V

CC

ASM692A

PFI

ASM802L

ASM802M

ASM805L

GND

PFO

V- = V

TRIP

1

R

2

0V

V

TRIP

V-

1.25 V

51.25–

-------------------

R

1

Figure 8: Using PFI To Monitor Negative Supply Voltage

–

-------------------------------

=

R

TRIP

2

0V

µP Power Supply Supervisor With Battery Backup Switch

Notice: The information in this document is subject to change without notice

7 of 13

October 2003

rev 1.0

Absolute Maximum Ratings

Parameter Min Max Unit

Pin Terminal Voltage with Respect to Ground

ASM690A / 692A
ASM802L / 802M

ASM805L

V

CC

V

BATT

All other inputs * -0.3

Input Current at V

Input Current at V

Input Current at GND 20 mA

Output Current

V

OUT

All other inputs 20 mA

Rate of Rise: V

Continuous Power Dissipation

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

Operating Temperature Range (C Devices) 0 70 °C

CC

BATT

BATT

and V

CC

-0.3 6.0 V

-0.3 6.0 V

V

+ 0.3

CC

200 mA

50 mA

Short circuit protected

100 V/µs

V

Operating Temperature Range (E Devices) -40 85 °C

Storage Temperature Range -65 160 °C

Lead Temperature Soldering, (10 sec) 300 °C

* 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

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;

V

= 2.8V; and TA = T

BATT

Parameter Symbol Conditions Min Typ Max Unit

, V

BATT

Voltage

V

CC

Range (Note 1)

MIN

to T

.

MAX

ASM69_AC, ASM802_C 1.1 5.5

ASM69_AE, ASM80__E 1.1 5.5

ASM805L

VASM805LC 1.1 5.5

Supply Current
Excluding I

I

SUPPLY

Backup Mode
(Excluding I

V

BATT

Current (Note 2)

V

OUT

V

OUT

Backup Mode

Battery Switch
Threshold,
V

CC

Battery Switch over
Hysteresis

OUT

in Battery

OUT

Standby

Output

in Battery

to V

BATT

)

I

S

ASM69_AC, ASM80__E 35 100

ASM69_AC, ASM802_C 35 100

T

= 25°C

A

V

= 0V, V

CC

5.5V>V

CC>VBATT

= 5mA

I

OUT

= 50mA VCC-0.25 VCC-0.10

I

OUT

I

=250µA, VCC < V

OUT

VCC < V

ASM690A/802L/805L 4.50 4.65 4.75

RT

BATT

=2.8V

-0.2V

TA = T

TA = 25°C

T

A

-0.2V V

BATT

Power Up
Power Down

= T

MIN

MIN

to T

to T

MAX

MAX

-0.1

-1.0

V

CC

0.025

BATT

-

-0.1 V

-0.010

V

CC

-0.001

BATT

20

-20

40 mV

1.0

5.0

0.02

0.02

µA

µA

µA

V

V

mV

ASM692A, ASM802M 4.25 4.40 4.50

Reset Threshold

V

RT

ASM802L, T

= 25°C, VCC falling

A

ASM802M, T

Notes:

1. If V

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 V
input impedance is 50 kΩ. WDI is biased to 0.3V

CC

or V

is 0V, the other must be greater than 2.0V.

BATT

µP Power Supply Supervisor With Battery Backup Switch

Notice: The information in this document is subject to change without notice

=25°C, VCC falling

A

.

CC

4.55 4.70

4.30 4.45

is within the operating voltage range. WDI

CC

V

9 of 13

ASM690A / 692A
ASM802L / 802M

October 2003

rev 1.0

Parameter Symbol Conditions Min Typ Max Unit

ASM805L

Reset Threshold
Hysteresis

Reset Pulse Width

Reset Output Volt­age

Watchdog Timeout

WDI Pulse Width

WDI Input Current

t

t

t

RS

WD

WP

40 mV

140 200 280 ms

I

SOURCE

I

SINK

ASM69_AC, ASM802_C, V

I

SINK

ASM69_AE, ASM802_E, V

I

SINK

ASM805LC, I

ASM805LE, I

ASM805L, I

ASM805L, I

VIL = 0.4V, VIH = 0.8V

WDI = V

WDI = 0V -150 -50 µA

= 800µA VCC - 1.5

= 3.2mA

=1.0V,

CC

=50µA

=1.2V,

CC

=100µA

SOURCE

SOURCE

SOURCE

SINK

CC

=4µA, VCC = 1.1V

=4µA, VCC = 1.2V

=800µA VCC - 1.5

=3.2mA

CC

0.4

0.3

0.3

0.8

0.9

0.4

1.00 1.60 2.25 sec

50 ns

50 150 µA

V

WDI Input Thresh-

V

old
(Note 3)

PFI Input Thresh­old

PFI Input Current -25 0.01 25 nA

PFO Output Volt­age

Notes:

1. If V

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 V
input impedance is 50 kΩ. WDI is biased to 0.3V

CC

or V

is 0V, the other must be greater than 2.0V.

BATT

= 5V, Logic LOW

CC

ASM69_A,ASM805L, V

ASM802_C/E, V

I

SOURCE

I

SINK

= 800µA VCC - 1.5

= 3.2mA

CC

= 5V

.

CC

CC

= 5V

0.8 V

1.20 1.25 1.30

1.225 1.250 1.275

0.4

is within the operating voltage range. WDI

CC

V

V

10 of 13

µP Power Supply Supervisor With Battery Backup Switch

Notice: The information in this document is subject to change without notice

ASM690A / 692A
ASM802L / 802M

October 2003

rev 1.0

Plastic DIP (8-Pin)

CerDIP (8-Pin)

SO (8-Pin)

ASM805L

Package Information

Inches Millimeters

Min Max Min Max

Plastic DIP (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 7.11

e 0.100 - 2.54

eA 0.300 - 7.62

eB - 0.430 - 10.92

eC - 0.060

L 0.115 0.150 2.92 3.81

CerDIP (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 2.54

L 0.125 0.200 3.18 5.08

SO (8-Pin) **

A 0.053 0.069 1.35 1.75

A1 0.004 0.010 0.10 0.25

B 0.013 0.020 0.33 0.51

C 0.007 0.010 0.19 0.25

e 0.050 1.27

E 0.150 0.157 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

October 2003

rev 1.0

Ordering Information

Part Number Reset Threshold (V) Temperature Range (°C) Pins-Package

ASM690A

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

ASM690AEPA -40 TO +85 8-Plastic DIP

ASM690AESA 4.5 TO 4.75 -40 TO +85 8-SO

ASM690AMJA 4.5 TO 4.75 Contact Factory 8-Cer DIP

ASM692A

ASM692ACPA 4.25 TO 4.50 0 TO +70 8-Plastic DIP

ASM805L

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

ASM802L

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

ASM802M

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

ASM805L

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

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

rev 1.0

ASM690A / 692A
ASM802L / 802M

ASM805L

Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com

© 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
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the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.

Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM690A / 692A

ASM802L / 802M
ASM805L

Document Version: 1.0