MAX706CSA [MAXIM]
Low-Cost, uP Supervisory Circuits; 低成本，同比监控电路
| 型号： | MAX706CSA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Cost, uP Supervisory Circuits |
| 文件： | 总12页 (文件大小：101K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4334; Rev. 5; 9/95
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
_______________Ge n e ra l De s c rip t io n
___________________________Fe a t u re s
♦ µMAX Package: Smallest 8-Pin SO
The MAX705-MAX708/MAX813L microprocessor (µP)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to separate ICs or discrete components.
♦ Guaranteed RESET Valid at VCC = 1V
♦ Precision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
♦ 200ms Reset Pulse Width
The MAX705/MAX706/MAX813L provide four functions:
♦ Debounced TTL/CMOS-Compatible
1) A reset output during power-up, power-down, and
brownout conditions.
Manual-Reset Input
♦ Independent Watchdog Timer—1.6sec Timeout
2) An independent watchdog output that goes low if
the watchdog input has not been toggled within 1.6
seconds.
(MAX705/MAX706)
♦ Active-High Reset Output
(MAX707/MAX708/MAX813L)
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power sup-
ply other than +5V.
♦ Voltage Monitor for Power-Fail or Low-Battery
Warning
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/
MAX706, except an active-high reset is substituted for
the watchdog timer. The MAX813L is the same as the
MAX705, except RESET is provided instead of RESET.
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX705CPA
MAX705CSA
MAX705CUA
MAX705C/D
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when
the s up p ly volta g e d rop s b e low 4.65V, while the
MAX706/MAX708 generate a reset pulse below 4.40V.
All four parts are available in 8-pin DIP, SO and µMAX
packages.
8 µMAX
Dice*
Ordering Information continued at end of data sheet.
* Dice are specified at T = +25°C.
A
**Contact factory for availability and processing to MIL-STD-883.
_______________________Ap p lic a t io n s
Computers
Controllers
_________________P in Co n fig u ra t io n s
TOP VIEW
MR
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
WDO
1
2
3
4
8
7
6
5
V
CC
RESET (RESET)
WDI
MAX705
MAX706
MAX813L
GND
PFI
PFO
__________Typ ic a l Op e ra t in g Circ u it
DIP/SO
UNREGULATED DC
MAX667
+5V DC LINEAR
REGULATOR
MR
RESET
RESET
N.C.
1
2
3
4
8
7
6
5
µP
V
CC
V
MAX707
MAX708
CC
GND
PFI
V
CC
RESET
PFI
RESET
I/O LINE
PFI
PFO
MAX705
MAX706
MAX813L
WDO
PFO
NMI
INTERRUPT
MR
DIP/SO
PUSHBUTTON
SWITCH
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
SO (derate 5.88mW/°C above +70°C) . . . . . . . . . . . . . . . 471mW
V
µMAX (derate 4.10mW/°C above +70°C) . . . . . . . . . . . . 330mW
CERDIP (derate 8.00mW/°C above +70°C) . . . . . . . . . . 640mW
Operating Temperature Ranges
CC
All Other Inputs (Note 1) . . . . . . . . . . . . . . . -0.3V to (V + 0.3V)
CC
Input Current
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
MAX70_C__, MAX813LC__ . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
MAX70_E__, MAX813LE__ . . . . . . . . . . . . . . . . . . . -40°C to +85°C
MAX70_MJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . -65°C to +160°C
Lead Temperature (soldering, 10sec) . . . . . . . . . . . . . . . . +300°C
CC
GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Output Current (all outputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Continuous Power Dissipation
Plastic DIP (derate 9.09mW/°C above +70°C) . . . . . . . 727mW
Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA.
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.
ELECTRICAL CHARACTERISTICS
(V = 4.75V to 5.5V for MAX705/MAX707/MAX813L, V = 4.5V to 5.5V for MAX706/MAX708, T = T
to T
, unless otherwise noted.)
CC
CC
A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX70_C
MAX813LC
1.0
1.1
1.2
5.5
5.5
Operating Voltage Range
V
CC
V
MAX70_E/M, MAX813LE/M
5.5
MAX705C, MAX706C, MAX813LC
150
150
50
350
500
350
500
4.75
4.50
MAX705E/M, MAX706E/M, MAX813LE/M
MAX707C, MAX708C
Supply Current
I
µA
V
SUPPLY
MAX707E/M, MAX708E/M
MAX705, MAX707, MAX813L
MAX706, MAX708
50
5–70/MAX813L
4.50
4.25
4.65
4.40
40
Reset Threshold (Note 2)
V
RT
Reset Threshold Hysteresis (Note 2)
Reset Pulse Width (Note 2)
mV
ms
t
140
200
280
RS
I
= 800µA
V
CC
- 1.5
SOURCE
I
= 3.2mA
0.4
0.3
0.3
SINK
RESET Output Voltage
V
MAX70_C, V = 1V, I
= 50µA
CC
SINK
MAX70_E/M, V = 1.2V, I
= 100µA
CC
SINK
MAX707, MAX708, I
MAX707, MAX708, I
= 800µA
V
CC
- 1.5
SOURCE
= 1.2mA
0.4
SINK
MAX813LC, I
MAX813LE/M, I
= 4µA, V = 1.1V
CC
0.8
0.9
- 1.5
SOURCE
RESET Output Voltage
V
= 4µA, V = 1.2V
SOURCE
CC
I
= 800µA
V
SOURCE
CC
MAX813L
I
= 3.2mA
0.4
SINK
Watchdog Timeout Period
WDI Pulse Width
t
MAX705, MAX706, MAX813L
V = 0.4V, V = (V ) (0.8)
IL
1.00
50
1.60
2.25
sec
ns
WD
t
WP
IH
CC
Low
WDI Input Threshold
High
0.8
MAX705, MAX706, MAX813L,
= 5V
V
V
3.5
CC
MAX705, MAX706, MAX813L, WDI = V
50
150
CC
WDI Input Current
µA
MAX705, MAX706, MAX813L, WDI = 0V
-150
-50
MAX705, MAX706, MAX813L,
V
CC
- 1.5
I
= 800µA
SOURCE
WDO Output Voltage
V
MAX705, MAX706, MAX813L,
= 1.2mA
0.4
I
SINK
2
_______________________________________________________________________________________
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
ELECTRICAL CHARACTERISTICS (continued)
(V = 4.75V to 5.5V for MAX705/MAX707/MAX813L, V = 4.5V to 5.5V for MAX706/MAX708, T = T
to T
, unless otherwise noted.)
CC
CC
A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MR Pull-Up Current
MR Pulse Width
MR = 0V
100
150
250
600
µA
ns
t
MR
Low
0.8
MR Input Threshold
V
High
2.0
MR to Reset Out Delay (Note 2)
PFI Input Threshold
t
250
1.30
ns
V
MD
V
CC
= 5V
1.20
1.25
0.01
PFI Input Current
-25.00
25.00
nA
I
= 800µA
V
CC
- 1.5
SOURCE
PFO Output Voltage
V
I
= 3.2mA
0.4
SINK
Note 2: Applies to both RESET in the MAX705-MAX708 and RESET in the MAX707/MAX708/MAX813L.
_______________________________________________________________________________________
3
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
MAX705/MAX707
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX705/MAX707
RESET RESPONSE TIME
POWER-FAIL COMPARATOR
DE-ASSERTION RESPONSE TIME
+5V
+5V
+5V
PFI
V
T
A
= +5V
= +25°C
CC
T
A
= +25°C
+5V
V
CC
PFO
V
+4V
CC
30pF
1k
+3V
T
A
= +25°C
PFO
+1.25V
+5V
0V
V
CC
V
CC
V
CC
V
CC
0V
10k
RESET
2k
RESET
330pF
+1.30V
RESET
GND
RESET
GND
RESET
RESET
30pF
PFI
+1.20V
0V
0V
500ms/div
2µs/div
400ns/div
MAX707
RESET, RESET ASSERTION
MAX707
RESET, RESET DE-ASSERTION
POWER-FAIL COMPARATOR
ASSERTION RESPONSE TIME
V
T
A
= V
= +25°C
V
= V
CC
RT
CC RT
+5V
T = +25°C
A
+5V
+5V
+5V
5–70/MAX813L
PFO
PFI
1k
PFO
RESET
RESET
RESET
RESET
V
CC
10k
0V
0V
RESET
RESET
GND
V
CC
30pF
10k
10k
330pF
0V
+1.25V
RESET
RESET
GND
330pF
+5V
+5V
10k
330pF
+1.30V
PFI
V
T
= +5V
= +25°C
CC
330pF
A
0V
0V
+1.20V
400ns/div
400ns/div
400ns/div
MAX707/MAX708/MAX813L
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX813L
RESET RESPONSE TIME
+5V
+5V
+5V
T
= +25°C
A
V
V
CC
+4V
CC
V
CC
RESET
GND
V
10k 330pF
CC
RESET
GND
0V
0V
0V
+4V
330pF
10k
RESET
0V
2µs/div
500ms/div
4
_______________________________________________________________________________________
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
______________________________________________________________P in De s c rip t io n
PIN
MAX705/MAX706 MAX707/MAX708
MAX813L
NAME
FUNCTION
DIP/SO
µMAX
DIP/SO
µMAX
DIP/SO
µMAX
Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an inter-
nal 250µA pull-up current. It can be driven from a TTL
or CMOS logic line as well as shorted to ground with
a switch.
1
3
1
3
1
3
MR
V
2
3
4
5
2
3
4
5
2
3
4
5
+5V Supply Input
CC
GND
0V Ground Reference for all signals
Power-Fail Voltage Monitor Input. When PFI is less
than 1.25V, PFO goes low. Connect PFI to GND or
4
5
6
7
4
5
6
7
4
5
6
7
PFI
V
when not used.
CC
Power-Fail Output goes low and sinks current when
PFI is less than 1.25V; otherwise PFO stays high.
PFO
Watchdog Input. If WDI remains high or low for
1.6sec, the internal watchdog timer runs out and
WDO goes low (Figure 1). Floating WDI or connect-
ing WDI to a high-impedance three-state buffer dis-
ables the watchdog feature. The internal watchdog
timer clears whenever reset is asserted, WDI is three-
stated, or WDI sees a rising or falling edge.
6
-
8
-
-
6
7
-
-
6
-
8
-
WDI
N.C.
No Connect
Active-Low Reset Output pulses low for 200ms when
triggered, and stays low whenever V is below the
CC
reset threshold (4.65V in the MAX705 and 4.40V in the
7
1
1
-
-
RESET
MAX706). It remains low for 200ms after V rises
CC
above the reset threshold or MR goes from low to high
(Figure 3). A watchdog timeout will not trigger RESET
unless WDO is connected to MR.
Watchdog Output pulls low when the internal watch-
dog timer finishes its 1.6sec count and does not go
high again until the watchdog is cleared. WDO also
goes low during low-line conditions. Whenever V is
below the reset threshold, WDO stays low; however,
unlike RESET, WDO does not have a minimum pulse
CC
8
2
-
-
8
7
2
1
WDO
width. As soon as V rises above the reset thresh-
CC
old, WDO goes high with no delay.
Active-High Reset Output is the inverse of RESET.
Whenever RESET is high, RESET is low, and vice
versa (Figure 2). The MAX813L has a RESET output
only.
-
-
8
2
RESET
_______________________________________________________________________________________
5
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
WATCHDOG
TRANSITION
DETECTOR
6
WATCHDOG
TIMER
8
7
5
WDI
8
7
WDO
V
CC
RESET
RESET
V
CC
250µA
TIMEBASE FOR
RESET AND
WATCHDOG
1
2
MR
250µA
1
2
MR
RESET
GENERATOR
V
CC
RESET
GENERATOR
RESET
(RESET)
V
CC
MAX707
MAX708
4.65V*
1.25V
MAX705
MAX706
MAX813L
4.65V*
1.25V
4
PFI
5
4
PFO
PFI
PFO
3
GND
3
GND
* 4.40V FOR MAX7O6.
( ) ARE FOR MAX813L ONLY.
* 4.40V FOR MAX7O6.
Figure 1. MAX705/MAX706/MAX813L Block Diagram
Figure 2. MAX707/MAX708 Block Diagram
WDI input is three-stated, the watchdog timer will stay
cleared and will not count. As soon as reset is released
and WDI is driven high or low, the timer will start counting.
Pulses as short as 50ns can be detected.
_______________De t a ile d De s c rip t io n
5–70/MAX813L
Re s e t Ou t p u t
A microprocessor’s (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 MAX705-MAX708/MAX813L
assert reset during power-up and prevent code execu-
tion errors during power-down or brownout conditions.
Typically, WDO will be connected to the non-maskable
interrupt input (NMI) of a µP. When VCC drops below
the reset threshold, WDO will go low whether or not the
watchdog timer has timed out yet. Normally this would
trigger an NMI interrupt, but RESET goes low simultane-
ously, and thus overrides the NMI interrupt.
On power-up, once VCC reaches 1V, RESET is a guaran-
teed logic low of 0.4V or less. As V rises, RESET stays
low. When VCC rises above the resCeCt threshold, an inter-
nal timer releases RESET after about 200ms. RESET puls-
es low whenever VCC dips below the reset threshold, i.e.
brownout condition. If brownout occurs in the middle of
a previously initiated reset pulse, the pulse continues for
at least another 140ms. On power-down, once V falls
below the reset threshold, RESET stays low and iCs Cguar-
If WDI is left unconnected, WDO can be used as a low-
line output. Since floating WDI disables the internal
timer, WDO goes low only when VCC falls below the
reset threshold, thus functioning as a low-line output.
The MAX705/MAX706 have a watchdog timer and a
RESET output. The MAX707/MAX708 have both active-
high and active-low reset outputs. The MAX813L has
both an active-high reset output and a watchdog timer.
anteed to be 0.4V or less until V drops below 1V.
CC
The MAX707/MAX708/MAX813L active-high RESET output
is simply the complement of the RESET output, and is
guaranteed to be valid with V down to 1.1V. Some µPs,
such as Intel’s 80C51, requireCaCn active-high reset pulse.
Ma n u a l Re s e t
The manual-reset input (MR) allows reset to be trig-
gered by a pushbutton switch. The switch is effectively
debounced by the 140ms minimum reset pulse width.
MR is TTL/CMOS logic compatible, so it can be driven
by an external logic line. MR can be used to force a
wa tc hd og time out to g e ne ra te a re s e t p uls e in the
MAX705/MAX706/MAX813L. Simply connect WDO to
MR.
Wa t c h d o g Tim e r
The MAX705/MAX706/MAX813L watchdog circuit moni-
tors the µP’s activity. If the µP does not toggle the watch-
dog input (WDI) within 1.6sec and WDI is not three-stat-
ed, WDO goes low. As long as RESET is asserted or the
6
_______________________________________________________________________________________
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
To build an early-warning circuit for power failure, con-
ne c t the PFI p in to a volta g e d ivid e r (s e e Typ ic a l
Operating Circuit). Choose the voltage divider ratio so
that the voltage at PFI falls below 1.25V just before the
+5V regulator drops out. Use PFO to interrupt the µP
so it can prepare for an orderly power-down.
P o w e r-Fa il Co m p a ra t o r
The power-fail comparator can be used for various pur-
poses because its output and noninverting input are
not internally connected. The inverting input is internal-
ly connected to a 1.25V reference.
__________Ap p lic a t io n s In fo rm a t io n
t
WP
t
t
t
WD
WD
WD
En s u rin g a Va lid RES ET
+5V
0V
WDI
WDO
Ou t p u t Do w n t o V
= 0 V
CC
When VCC falls below 1V, the MAX705-MAX708 RESET
output no longer sinks current—it becomes an open cir-
cuit. High-impedance CMOS logic inputs can drift to
undetermined voltages if left undriven. If a pull-down
resistor is added to the RESET pin as shown in Figure 5,
any stray charge or leakage currents will be drained to
ground, holding RESET low. Resistor value (R1) is not
critical. It should be about 100kΩ, large enough not to
load RESET and small enough to pull RESET to ground.
+5V
0V
+5V
0V
RESET
RESET EXTERNALLY
TRIGGERED BY MR
t
RS
+5V
0V
(RESET)
Mo n it o rin g Vo lt a g e s Ot h e r Th a n t h e
Un re g u la t e d DC In p u t
Monitor voltages other than the unregulated DC by
connecting a voltage divider to PFI and adjusting the
ratio appropriately. If required, add hysteresis by con-
necting a resistor (with a value approximately 10 times
the sum of the two resistors in the potential divider net-
work) between PFI and PFO. A capacitor between PFI
and GND will reduce the power-fail circuit’s sensitivity
to high-frequency noise on the line being monitored.
RESET can be asserted on other voltages in addition to
the +5V VCC line. Connect PFO to MR to initiate a RESET
pulse when PFI drops below 1.25V. Figure 6 shows the
MAX705-MAX708 configured to assert RESET when the
+5V supply falls below the reset threshold, or when the
+12V supply falls below approximately 11V.
( ) ARE FOR MAX813L ONLY.
Figure 3. MAX705/MAX706/MAX813L Watchdog TIming
V
RT
V
RT
V
CC
t
RS
t
RS
+5V
RESET
0V
Mo n it o rin g a Ne g a t ive Vo lt a g e
The power-fail comparator can also monitor a negative
supply rail (Figure 7). When the negative rail is good (a
negative voltage of large magnitude), PFO is low, and
when the negative rail is degraded (a negative voltage
of lesser magnitude), PFO is high. By adding the resis-
tors and transistor as shown, a high PFO triggers reset.
As long a s PFO re ma ins hig h, the MAX705-
MAX708/MAX813L will keep reset asserted (RESET =
low, RESET = high). Note that this circuit’s accuracy
depends on the PFI threshold tolerance, the VCC line,
and the resistors.
+5V
0V
MR
t
MD
t
MR
+5V
0V
WDO
MR EXTERNALLY DRIVEN LOW
Figure 4. MAX705/MAX706 RESET, MR, and WDO Timing with
WDI Three-Stated. The MAX707/MAX708/MAX813L RESET
output is the inverse of RESET shown.
_______________________________________________________________________________________
7
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
+5V
+12V
V
CC
TO µP
RESET
1M
1%
MAX70_
MAX70_
MR
130k
1%
RESET
PFI
PFO
GND
R1
PARAMETER
MIN TYP MAX UNIT
10.67 10.87 11.50
+12V Reset
Threshold at +25°C
V
Figure 5. RESET Valid to Ground Circuit
Figure 6. Monitoring Both +5V and +12V
+5V
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
V
CC
100k
MR
R1
R2
5–70/MAX813L
MAX70_
100k
V
CC
V
CC
PFO
2N3904
PFI
MAX70_
µP
4.7k
RESET
RESET
RESET
TO µP
GND
V-
MR
GND
GND
+5V
0V
+5V
0V
PFO
Figure 8. Interfacing to µPs with Bidirectional Reset I/O
V
TRIP
V-
0V
In t e rfa c in g t o µP s w it h
Bid ire c t io n a l Re s e t P in s
1.25 − V
TRIP
5 −1.25
=
, V
TRIP
< 0
R1
R2
µPs with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the MAX705-MAX708
RESET output. If, for example, the RESET output is driven
high and the µP wants to pull it low, indeterminate logic
levels may result. To correct this, connect a 4.7kΩ
resistor between the RESET output and the µP reset I/O,
as in Figure 8. Buffer the RESET output to other system
components.
Figure 7. Monitoring a Negative Voltage
8
_______________________________________________________________________________________
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
__Orde ring Inform a tion (c ontinue d)
_______Pin Configura tion (c ontinue d)
PART
MAX705EPA
MAX705ESA
MAX705MJA
MAX706CPA
MAX706CSA
MAX706CUA
MAX706C/D
MAX706EPA
MAX706ESA
MAX706MJA
MAX707CPA
MAX707CSA
MAX707CUA
MAX707C/D
MAX707EPA
MAX707ESA
MAX707MJA
MAX708CPA
MAX708CSA
MAX708CUA
MAX708C/D
MAX708EPA
MAX708ESA
MAX708MJA
MAX813LCPA
MAX813LCSA
MAX813LCUA
MAX813LC/D
MAX813LEPA
MAX813LESA
MAX813LMJA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
TOP VIEW
(RESET) RESET
1
2
3
4
WDI
PFO
PFI
8
7
6
5
WDO
MR
8 CERDIP**
8 Plastic DIP
8 SO
MAX705
MAX706
MAX813L
V
CC
GND
8 µMAX
Dice*
µMAX
8 Plastic DIP
8 SO
RESET
RESET
MR
N.C.
PFO
PFI
1
2
3
4
8
7
6
5
8 CERDIP**
8 Plastic DIP
8 SO
MAX707
MAX708
V
CC
GND
8 µMAX
Dice*
µMAX
8 Plastic DIP
8 SO
( ) ARE FOR MAX813L ONLY.
8 CERDIP**
8 Plastic DIP
8 SO
____________________Chip Topogra phy
8 µMAX
Dice*
MR
V
CC
WDO/RESET
8 Plastic DIP
8 SO
RESET (RESET)
WDI/N. C.
8 CERDIP**
8 Plastic DIP
8 SO
0. 051"
(1. 30mm)
8 µMAX
Dice*
GND
8 Plastic DIP
8 SO
PFI PFO
8 CERDIP**
0. 074"
(1. 88mm)
* Dice are specified at T = +25 °C.
A
**Contact factory for availability and processing to MIL-STD-883.
( ) ARE FOR MAX813L ONLY.
TRANSISTOR COUNT: 572
SUBSTRATE MUST BE LEFT UNCONNECTED.
_______________________________________________________________________________________
9
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
_______________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
MIN
0.036
MAX
0.044
0.008
0.014
0.007
0.120
0.120
MIN
0.91
0.10
0.25
0.13
2.95
2.95
MAX
1.11
0.20
0.36
0.18
3.05
3.05
A
C
A1 0.004
α
A
B
C
D
E
e
0.010
0.005
0.116
0.116
0.101mm
0.004 in
e
B
A1
L
0.0256
0.65
H
L
0.188
0.016
0°
0.198
0.026
6°
4.78
0.41
0°
5.03
0.66
6°
α
21-0036D
E
H
8-PIN µMAX
MICROMAX SMALL-OUTLINE
PACKAGE
D
5–70/MAX813L
10 ______________________________________________________________________________________
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
1 0 0 0 - u p ( $ )
P r i c e
†
P i n s
m a x ( t y p )
µ A
B a c k u p M o d e
S U P P L Y
I
m a x ( t y p )
m A
O p e r a t i n g
M o d e
S U P P L Y
I
O u t p u t
B a t t e r y - O n
O u t p u t
L o w - L i n e
PSpevoyCrcuits
I n p u t
M a n u a l - R e s e t
C o m p a r a t o r
P o w e r - F a i l
P r o t e c t
W r E i t C e
– — –
) Ω
M a x (
O n R e s i s t a n c e
O U T
- t o - V B A V T T
) Ω
M a x (
O n R e s i s t a n c e
O U T
- t o C - V C V
S w i t c h
B a c k u p - B a t t e r y
O u t p u t
W a t c h d o g
S e p a r a t e
( s e c ) , i f A v a i l a b l e
T i m e o u t P e r i o d
W a t c h d o g
N o m i n a l
C C
= 1 V t o V
V a T l i E d S E R
– — — — — –
R e s e t
A c t i v e - H i g h
R e s e t
A c t i v e - L o w
P u l s e W i d t h ( m s )
M i n i m u m R e s e t
T h r e s h o l d ( V )
N o m i n a l R e s e t
N u m b e r
P a r t
_µ
______________________________________________________________________________________ 11
Lo w -Co s t , µP S u p e rvis o ry Circ u it s
5–70/MAX813L
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.
12 __________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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