MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0130; Rev 2; 11/05
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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General Description
The MAX703/MAX704 microprocessor (µP) supervisory
circuits reduce the complexity and number of compo-
nents required for power-supply monitoring and battery
control functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to that obtained with separate ICs or discrete
components.
The MAX703/MAX704 are available in 8-pin DIP and SO
packages and provide four functions:
1) An active-low reset during power-up, power-down,
and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS
µPs, or other low-power logic circuitry.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power
supply other than +5V.
4) An active-low manual reset input.
The MAX703 and MAX704 differ only in their supply-
voltage monitor levels. The MAX703 generates a reset
when the supply drops below 4.65V, while the MAX704
generates a reset below 4.40V.
Features
Applications
*
Dice are tested at TA= +25°C only.
**
Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP and SO packages are available in both leaded
and lead-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
PART TEMP RANGE PIN-PACKAGE
MAX703C/D 0°C to +70°C Dice*
MAX703CPA 0°C to +70°C 8 PDIP
MAX703CSA 0°C to +70°C 8 SO
MAX703EPA -40°C to +85°C 8 PDIP
MAX703ESA -40°C to +85°C 8 SO
MAX703MJA -55°C to +125°C 8 CERDIP**
MAX704C/D 0°C to +70°C Dice*
MAX704CPA 0°C to +70°C 8 PDIP
MAX704CSA 0°C to +70°C 8 SO
MAX704EPA -40°C to +85°C 8 PDIP
MAX704ESA -40°C to +85°C 8 SO
MAX704MJA -55°C to +125°C 8 CERDIP**
Battery-Backup Power Switching
Precision Supply-Voltage Monitor
4.65V (MAX703)
4.40V (MAX704)
200ms Reset Pulse Width
Debounced TTL/CMOS-Compatible Manual Reset
Input
200µA Quiescent Current
50nA Quiescent Current in Battery-Backup Mode
Voltage Monitor for Power-Fail or Low-Battery
Warning
8-Pin DIP and SO Packages
Guaranteed RESET Assertion to VCC = 1V
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
MR
PFOPFI
1
2
8
7
VBATT
RESETVCC
GND
VOUT
DIP/SO
TOP VIEW
3
4
6
5
MAX703
MAX704
Pin Configuration
MAX703
MAX704
UNREGULATED DC REGULATED +5V
CMOS RAM
MICROPROCESSOR
3.6V
LITHIUM
BATTERY
R1
R2
PFI
PUSHBUTTON
SWITCH
0.1µF
VOUT
VBATT
VCC
NMI
VCC
GND
GND
GND
BUS
MR
RESET RESET
PFO
VCC
Typical Operating Circuit
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +4.75V to +5.5V for MAX703, VCC = +4.5V to +5.5V for MAX704, VBATT = 2.8V, TA= TMIN to TMAX, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
VCC ....................................................................-0.3V to +6.0V
VBATT.................................................................-0.3V to +6.0V
All Other Inputs (Note 1).........................-0.3V to (VCB + 0.3V)
Input Current
VCC ...............................................................................200mA
VBATT ..............................................................................50mA
GND ................................................................................20mA
Output Current
VOUT...............................Short-Circuit Protected for Up to 10s
All Other Outputs ............................................................20mA
Rate-of-Rise VBATT, VCC .................................................100V/µs
Operating Temperature Range
C Suffix................................................................0°C to +70°C
E Suffix.............................................................-40°C to +85°C
M Suffix ..........................................................-55°C to +125°C
Continuous Power Dissipation (TA= +70°C)
8-Pin PDIP (derated 9.09mW/°C above +70°C) ..........727mW
8-Pin SO (derated 5.88mW/°C above +70°C) .............471mW
8-Pin CERDIP (derated 8.00mW/°C above +85°C) .....640mW
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: VCB is the greater of VCC and VBATT. The input voltage limits on PFI and MR may be exceeded if the current into these pins
is limited to less than 10mA.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range
V
CC
, V
BATT
(Note 2) 0 5.5 V
MAX70_C 200 350
Supply Current (Excluding
I
OUT
)I
SUPPLY
MAX70_E/M 200 500 µA
T
A
= +25°C 0.05 1.0
I
SUPPLY
in Battery-Backup
Mode (Excluding I
OUT
)
V
CC
= 0V, V
BATT
=
2.8V T
A
= T
MIN
to T
MAX
5.0 µA
T
A
= +25°C -0.10 +0.02
V
BATT
Standby Current
(Note 3)
5.5V > V
CC
> V
BATT
+ 0.2V T
A
= T
MIN
to T
MAX
-1.00 +0.02 µA
I
OUT
= 5mA V
CC
-
0.05
V
CC
-
0.025
V
OUT
Output
I
OUT
= 50mA V
CC
-
0.5
V
CC
-
0.25
V
V
OUT
in Battery-Backup
Mode I
OUT
= 250µA, V
CC
< V
BATT
- 0.2V V
BATT
-
0.1
V
BATT
-
0.02 V
Power-up 20
Battery Switch Threshold
(V
CC
- V
BATT
)V
CC
< V
RST
Power-down -20 mV
Battery Switchover Hysteresis 40 mV
MAX703 4.50 4.65 4.75
RESET Threshold V
RST
MAX704 4.25 4.40 4.50 V
RESET Threshold Hysteresis 40 mV
RESET Pulse Width t
RST
140 200 280 ms
V
OH
I
SOURCE
= 800µA V
CC
-
1.5
I
SINK
= 3.2mA 0.4
MAX70_C, V
CC
= 1V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 50µA 0.3
RESET Output Voltage
V
OL
MAX70_E/M, V
CC
= 1.2V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 100µA 0.3
V
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +4.75V to +5.5V for MAX703, VCC = +4.5V to +5.5V for MAX704, VBATT = 2.8V, TA= TMIN to TMAX, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VIL Low 0.8
MR Input Threshold VIH High 2.0 V
MR Pulse Width tMR 150 ns
MR to RESET Delay tMD 250 ns
MR Pullup Current MR = 0V 100 250 600 µA
PFI Input Threshold VCC = 5V 1.20 1.25 1.30 V
PFI Input Current -25 +0.01 +25 nA
VOH ISOURCE = 800µA VCC -
1.5
PFO Output Voltage
VOL ISINK = 3.2mA 0.4
V
Note 2: Either VCC or VBATT can go to 0V if the other is greater than 2.0V.
Note 3: “-“ = battery-charging current, “+” = battery-discharging current.
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX703 toc01
IOUT (mA)
VOUT (V)
40302010
4.80
4.85
4.90
4.95
5.00
4.75
050
VCC = +5V
VBATT = +2.8V
TA = +25°C
SLOPE = 5Ω
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX703 toc02
IOUT (mA)
VOUT (V)
0.80.60.40.2
2.72
2.74
2.76
2.78
2.80
2.70
0 1.0
VCC = 0V
VBATT = +2.8V
TA = +25°C
SLOPE = 80Ω
MAX703 toc03
500ms/div
MAX703 RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
OV
VCC
+5V
1V/div
+5V
1V/div
0V
VBATT = 0V
TA = +25°C
RESET
330pF
2kΩ
RESET
RESET
GND
VCC
VCC
MAX703 toc04
2µs/div
MAX703 RESET RESPONSE TIME
+5V
+5V
VCC
1V/div
+4V
0V
TA = +25°C
RESET
30pF
10kΩ
RESET
RESET
GND
VCC
VCC
MAX703 toc05
400ns/div
POWER-FAIL COMPARATOR
RESPONSE TIME
+1.30V
+5V
+1.20V
0V
VCC = +5V
TA = +25°C
PFI
PFO
30pF
1kΩ
PFO
PFI
+5V
1.25V
MAX703 toc06
400ns/div
POWER-FAIL COMPARATOR
RESPONSE TIME
+1.20V
+1.30V
+3V
0V
PFI
PFO 30pF
PFO
1kΩ
PFI +5V
1.25V
VCC = +5V
TA = +25°C
Typical Operating Characteristics
(VCC = +5V, VBATT = 2.8V, TA= +25°C, unless otherwise noted.)
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
4 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1V
OUT Supply Output for CMOS RAM. When VCC is above the reset threshold, VOUT connects to VCC through a p-
channel MOSFET switch. When VCC is below the reset threshold, the higher of VCC or VBATT is connected to VOUT.
2V
CC +5V Supply Input
3 GND Ground
4 PFI Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes low; otherwise PFO remains high. Connect
PFI to GND or VCC when not used.
5PFO P ow er - Fai l C om p ar ator O utp ut. It g oes l ow and si nks cur r ent w hen P FI i s l ess than 1.25V ; other w i se P FO r em ai ns hi g h.
6MR
Manual Reset Input. Generates a reset pulse when pulled below 0.8V. This active-low input is TTL/CMOS
compatible and can be shorted to ground with a switch. It has an internal 250µA pullup current. Leave floating
when not used.
7RESET Reset Output. Remains low while VCC is below the reset threshold (4.65V for the MAX703, 4.40V for the MAX704).
It remains low for 200ms after VCC rises above the reset threshold (Figure 2) or MR goes from low to high.
8V
BATT
Backup-Battery Input. When VCC falls below the reset threshold, VBATT is switched to VOUT if VBATT is 20mV
greater than VCC. When VCC rises 20mV above VBATT, VCC is switched to VOUT. The 40mV hysteresis prevents
repeated switching if VCC falls slowly.
BATTERY-SWITCHOVER
CIRCUITRY
GND
1.25V
MAX703
MAX704
RESET
GENERATOR RESET
PFO
MR
VOUT
VBATT
VCC
PFI
1.25V
Figure 1. Block Diagram
RESET
PFO*
VBATT = 3.0V
*PFO DEPENDS ON PFI EXCEPT IN BATTERY-BACKUP MODE, WHERE PFO IS LOW.
+5V
VCC
VOUT
+5V
+5V
0V
+5V
0V
0V
0V
VRST
3.0V
tRST
Figure 2. Timing Diagram
Detailed Description
RESET
Output
A µP’s reset input starts the µP in a known state.
Whenever the µP is in an unknown state, it should be
held in reset. The MAX703/MAX704 assert reset when
VCC is low, preventing code-execution errors during
power-up, power-down, or brownout conditions.
When VBATT is 2V or more, RESET is always valid, irre-
spective of VCC. On power-up, as VCC rises, RESET
remains low. When VCC exceeds the reset threshold,
an internal timer holds RESET low for a time equal to
the reset pulse width (typically 200ms); after this inter-
val, RESET goes high (Figure 2). If a power-fail or
brownout condition occurs (i.e., VCC drops below the
reset threshold), RESET is asserted. As long as VCC
remains below the reset threshold, the internal timer is
continually restarted, causing the RESET output to
remain low. Thus, a brownout condition that interrupts a
previously initiated reset pulse causes an additional
200ms delay from the end of the last interruption.
Power-Fail Comparator
The PFI input is compared to an internal reference. If
PFI is less than 1.25V, PFO goes low. The power-fail
comparator can be used as an undervoltage detector
to signal a failing power supply. In the
Typical
Operating Circuit
, an external voltage-divider at PFI is
used to monitor the unregulated DC voltage from which
the regulated +5V supply is derived.
The voltage-divider can be chosen so the voltage at
PFI falls below 1.25V just before the +5V regulator
drops out. PFO is then used as an interrupt to prepare
the µP for power-down.
To conserve power, the power-fail comparator is turned
off and PFO is forced low when the MAX703/MAX704
enter battery-backup mode.
Backup-Battery Switchover
In the event of a brownout or power failure, it may be
necessary to preserve the contents of RAM. With a
backup battery installed at VBATT, the MAX703/
MAX704 automatically switch RAM to backup power
when VCC fails.
As long as VCC exceeds the reset threshold, VCC con-
nects to VOUT through a 5Ωp-channel MOSFET power
switch. Once VCC falls below the reset threshold,
RESET goes low and VCC or VBATT (whichever is high-
er) switches to VOUT. Note that VBATT switches to VOUT
through an 80Ωswitch only if VCC is below the reset-
threshold voltage and VBATT is greater than VCC. When
VCC exceeds the reset threshold, it is connected to the
MAX703/MAX704 substrate, regardless of the voltage
applied to VBATT (Figure 3). During this time, diode D1
(between VBATT and the substrate) conducts current
from VBATT to VCC if VBATT ≥(VCC + 0.6V).
When the battery-backup mode is activated, VBATT
connects to VOUT. In this mode, the substrate connects
to VBATT and internal circuitry is powered from the bat-
tery (Figure 3). Table 1 shows the status of the MAX703/
MAX704 inputs and outputs in battery-backup mode.
When VCC is below, but within, 1V of VBATT, the internal
switchover comparator draws about 30µA. Once VCC
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
_______________________________________________________________________________________ 5
SIGNAL STATUS
VCC Disconnected from VOUT.
VOUT Connected to VBATT through an internal 80Ω
p-channel MOSFET switch.
VBATT Connected to VOUT. Supply current is < 1µA when
VCC < (VBATT - 1V).
RESET Logic-low.
PFI Power-fail comparator is disabled.
PFO Logic-low.
MR Disabled.
Table 1. Input and Output Status in
Battery-Backup Mode
S1 S2
D1
D3
D2
S3 S4
VBATT
SUBSTRATE
MAX703
MAX704
VOUT
VCC
Figure 3. Battery-Switchover Block Diagram
CONDITION S1/S2 S3/S4
VCC > Reset Threshold Open Closed
VCC < Reset Threshold and
VCC > VBATT Open Closed
VCC < Reset Threshold and
VCC < VBATT Closed Open
MAX703/MAX704
drops to more than 1V below VBATT, the internal
switchover comparator shuts off and the supply current
falls to less than 1µA.
Manual Reset
The manual reset input (MR) allows RESET to be acti-
vated by a pushbutton switch. The switch is effectively
debounced by the 140ms minimum reset pulse width.
Because it is TTL/CMOS compatible, MR can be driven
by an external logic line.
Applications Information
Using a SuperCap
®
as a
Backup Power Source
SuperCaps are capacitors with extremely high capaci-
tance values (on the order of 0.1 Farad). When using
SuperCaps, if VCC exceeds the MAX703/MAX704 reset
thresholds (4.65V and 4.40V, respectively), VBATT may
not exceed VCC by more than 0.6V. Thus, with a 5% tol-
erance on VCC, VBATT should not exceed VCC (min)
+ 0.6V = 5.35V. Similarly, with a 10% tolerance on VCC,
VBATT should not exceed 5.1V.
Figure 4’s SuperCap circuit uses the MAX703 with a
±5% tolerance voltage supply. In this circuit, the
SuperCap rapidly charges to within a diode drop of
VCC. However, the diode leakage current with trickle-
charge the SuperCap voltage to VCC. If VBATT = 5.25V
and the power is suddenly removed and then reapplied
with VCC = 4.75V, VBATT - VCC does not exceed the
allowable 0.6V difference voltage.
Figure 5’s circuit uses the MAX704 with a ±10% tole-
rance voltage supply. Note that if VCC = 5.5V and
VBATT ≤5.1V, the power can be suddenly removed
and reapplied with VCC = 4.5V, and VBATT - VCC will
not exceed the allowable 0.6V voltage difference.
Batteries and Power Supplies
as Backup Power Sources
Lithium batteries work well as backup batteries
because they have very low self-discharge rates and
high-energy density. Single lithium batteries with open-
circuit voltages of 3.0V to 3.6V are ideal for use with the
MAX703/MAX704. Batteries with an open-circuit volt-
age less than the minimum reset threshold plus 0.3V
can be directly connected to the MAX703/MAX704
VBATT input with no additional circuitry (see the
Typical
Operating Circuit
).
However, batteries with open-circuit voltages greater
than the reset threshold plus 0.3V CANNOT be used as
backup batteries, since they source current into the
substrate through diode D1 (Figure 3) when VCC is
close to the reset threshold.
Using the MAX703/MAX704 without a
Backup Power Source
If a backup power source is not used, ground VBATT
and connect VCC to VOUT. A direct connection to VCC
eliminates any voltage drop across the internal switch,
which would otherwise appear at VOUT. Alternatively,
use the MAX705–MAX708, which do not have battery-
backup capabilities.
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
6 _______________________________________________________________________________________
SuperCap is a registered trademark of Bankor Industries.
+5V
VCC
0.1F
VOUT
VBATT
GND
RESET TO µP
TO STATIC RAM
MAX703
Figure 4. Using a SuperCap as a Backup Power Source with a
MAX703 and a +5V ±5% Supply
+5V
VCC
0.1F
VOUT
VBATT
GND
RESET TO µP
TO STATIC RAM
MAX704
100kΩ
Figure 5. Using a SuperCap as a Backup Power Source with
the MAX704 and a +5V ±10% Supply
PART MAXIMUM BACKUP-BATTERY VOLTAGE (V)
MAX703 4.80
MAX704 4.55
Table 2. Allowable Backup-Battery Voltages
Ensuring a Valid
RESET
Output
Down to VCC = 0V
When VCC falls below 1V, the MAX703/MAX704 RESET
output no longer sinks current; it becomes an open cir-
cuit. High-impedance CMOS logic inputs can drift to
undetermined voltages if left as open circuits. If a pull-
down resistor is added to the RESET pin as shown in
Figure 6, any stray charge or leakage currents will flow
to ground, holding RESET low. Resistor value R1 is not
critical. It should be about 100kΩ, which is large
enough not to load RESET and small enough to pull
RESET to ground.
Replacing the Backup Battery
The backup battery can be removed while VCC remains
valid without triggering a reset. As long as VCC stays
above the reset threshold, battery-backup mode cannot
be entered. This is an improvement on switchover ICs
that initiate a reset when VCC and VBATT are at or near
the same voltage level (regardless of the reset thresh-
old voltage). If the voltage on the unconnected VBATT
pin floats up toward VCC, this condition alone cannot
initiate a reset when using the MAX703/MAX704.
Adding Hysteresis to the
Power-Fail Comparator
Hysteresis adds a noise margin to the power-fail com-
parator and prevents repeated triggering of PFO when
VIN is near the power-fail comparator trip point. Figure 7
shows how to add hysteresis to the power-fail com-
parator. Select the ratio of R1 and R2 so that PFI sees
1.25V when VIN falls to the desired trip point (VTRIP).
Resistor R3 adds hysteresis. It will typically be an order
of magnitude greater than R1 or R2. The current
through R1 and R2 should be at least 1µA to ensure
that the 25nA (max) PFI input current does not shift the
trip point. R3 should be larger than 10kΩto prevent it
from loading down the PFO pin. Capacitor C1 adds
additional noise rejection.
Monitoring a Negative Voltage
The power-fail comparator can be used to monitor a
negative supply voltage using Figure 8’s circuit. When
the negative supply is valid, PFO is low. When the neg-
ative supply voltage droops, PFO goes high. This cir-
cuit’s accuracy is affected by the PFI threshold
tolerance, the VCC voltage, and resistors R1 and R2.
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
_______________________________________________________________________________________ 7
VCC VOUT
VBATT RESET
MAX703
MAX704
R1
Figure 6.
RESET
Valid to Ground Circuit
VIN
TO µP
+5V
+5V
0V
0V VLVTRIP
VIN
R1
R2 R3
PFI
*OPTIONAL
C1*
VCC
GND
PFO
PFO
MAX703
MAX704
VH
Figure 7. Adding Hysteresis to the Power-Fail Comparator
V-
+5V
+5V
0V
0V
VTRIP
V-
R1
R2
PFI
NOTE: VTRIP IS NEGATIVE
VCC
GND
PFO
PFO
MAX703
MAX704
Figure 8. Monitoring a Negative Voltage
VRR
R
VRR
RR R
TRIP
H
=+⎛
⎝
⎜⎞
⎠
⎟
=+
⎛
⎝
⎜⎞
⎠
⎟
125
125
12
2
23
12 3
.
./ ||
||
V
RRR
L−+−=
125 5 125 125
132
...
5 1 25 1 25
12
−=−..
R
V
R
TRIP
MAX703/MAX704
Using the Power-Fail Comparator
to Assert Reset
In addition to asserting reset at the VCC reset threshold
voltage, reset can also be asserted at the PFI input
threshold voltage. Connect PFO to MR to initiate a reset
pulse when the monitored supply drops below a user-
specified threshold or when VCC falls below the reset
threshold. For additional noise rejection, place a
capacitor between PFI and GND.
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
8 _______________________________________________________________________________________
PART
NOMI NAL
RESET
THRESHOLD
( V)
M I NI M UM
RESET
PULSE
WI DTH
( m s)
NOMI NAL
WATCH-
DOG
TI MEOUT
PERI OD
( s )
BACKUP-
BATTERY
SWITCH
CE
WRITE
PROTECT
POWER- FAI L
COMPARATOR
M ANUAL
RESET
I NPUT
WATCH-
DOG
I NPUT
LOW-
LI NE
OUTPUT
ACTI VE-
HI GH
RESET
BATT
ON
OUTPUT
MAX690A 4.65 140 1.6 Yes No Yes No No No No No
MAX691A 4.65 140/Adj. 1.6/Adj. Yes Yes Yes No Yes Yes Yes Yes
MAX692A 4.40 140 1.6 Yes No Yes No No No No No
MAX693A 4.40 140/Adj. 1.6/Adj. Yes Yes Yes No Yes Yes Yes Yes
MAX696 Adj. 35/Adj. 1.6/Adj. Yes No Yes No Yes Yes Yes Yes
MAX697 Adj. 35/Adj. 1.6/Adj. No Yes Yes No Yes Yes Yes No
MAX700 4.65/Adj. 200 — No No No Yes No No Yes No
MAX703 4.65 140 — Yes No Yes Yes No No No No
MAX704 4.40 140 — Yes No Yes Yes No No No No
MAX705 4.65 140 1.6 No No Yes Yes Yes No No No
MAX706 4.40 140 1.6 No No Yes Yes Yes No No No
MAX707 4.65 140 — No No Yes Yes No No Yes No
MAX708 4.40 140 — No No Yes Yes No No Yes No
MAX791 4.65 140 1.0 Yes Yes Yes Yes Yes Yes Yes Yes
MAX1232 4.50/4.75 250 0.15/0.60/
1.2 No No No Yes No No Yes No
MAX1259 — — — Yes No Yes No No No No No
Table 3. Maxim Microprocessor Supervisory Products
MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
9
© 2005 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
REDUTA
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages.
Chip Topography
SUBSTRATE MUST BE LEFT UNCONNECTED
TRANSISTOR COUNT: 573
