MAX823YEXK-T [MAXIM]
Analog IC ; 模拟IC\n
| 型号： | MAX823YEXK-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog IC
|
| 文件： | 总10页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0487; Rev 4; 7/01
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
________________General Description
Features
The MAX823/MAX824/MAX825* microprocessor (µP)
supervisory circuits combine reset output, watchdog,
and manual reset input functions in 5-pin SOT23 and
SC70 packages. They significantly improve system relia-
bility and accuracy compared to separate ICs or discrete
components. The MAX823/MAX824/MAX825 are specifi-
o Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power Supplies
o Operating Current: 6µA (MAX823L/M) (SC70)
2µA (MAX825T/S/R/Z/Y) (SC70)
o Fully Specified Over Temperature
o 140ms min Power-On Reset
cally designed to ignore fast transients on V
.
CC
Seven preprogrammed reset threshold voltages are
available (see Reset Threshold Table). All three devices
have an active-low reset output, which is guaranteed to
o Guaranteed RESET Valid to V
= 1V
CC
o Power-Supply Transient Immunity
o Watchdog Timer with 1.6s Timeout
be in the correct state for V
down to 1V. The MAX823
CC
(MAX823/MAX824)
also offers a watchdog input and manual reset input.
The MAX824 offers a watchdog input and a comple-
mentary active-high reset. The MAX825 offers a manual
reset input and a complementary active-high reset. The
Selector Guide explains the functions offered in this
series of parts.
o Manual Reset Input (MAX823/MAX825)
o No External Components
Ordering Information
†
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
PIN-PACKAGE
5 SC70-5
*Patents Pending
________________________Applications
MAX823_EXK-T
MAX823_EUK-T
MAX824_EXK-T
5 SOT23-5
5 SC70-5
Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Monitoring
Portable/Battery-Powered Equipment
†Insert the desired suffix letter (from the Reset Threshold table) into
the blank to complete the part number. All devices are available in
tape-and-reel only. There is a 2500 piece minimum order increment.
Ordering Information continued at end of data sheet.
______________________Selector Guide
Reset Threshold Table
RESET
THRESHOLD (V)
FUNCTION
MAX823
MAX824
MAX825
SUFFIX
✔
✔
✔
✔
—
✔
✔
Active-Low Reset
Active-High Reset
Watchdog Input
L
4.63
4.38
3.08
2.93
2.63
2.32
2.19
—
✔
✔
M
—
✔
T
Manual Reset Input
S
Typical Operating Circuit appears at end of data sheet.
Marking Information appears at end of data sheet.
R
Z (SC70 only)
Y (SC70 only)
Pin Configurations
TOP VIEW
1
2
3
5
4
V
1
2
3
5
4
1
2
3
5
RESET
GND
MR
RESET
GND
V
V
CC
RESET
GND
CC
CC
MAX823
MAX824
MAX825
WDI
RESET
WDI
4
MR
RESET
SOT23/SC70
SOT23/SC70
SOT23/SC70
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
ABSOLUTE MAXIMUM RATINGS
CC
All Other Pins..............................................-0.3V to (V
V
........................................................................-0.3V to +6.0V
5-Pin SOT23 (derate 7.1mW/ C above +70 C).............571mW
Operating Temperature Range
+ 0.3V)
CC
Input Current, All Pins Except RESET and RESET..............20mA
Output Current, RESET, RESET ..........................................20mA
MAX82_EXK......................................................-40 C to +85 C
MAX82_EUK ...................................................-40 C to +125 C
Storage Temperature Range.............................-65 C to +150 C
Lead Temperature (soldering, 10s) .................................+300 C
Continuous Power Dissipation (T = +70 C)
A
5-Pin SC70 (derate 3.1mW/ C above +70 C)...............247mW
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 MAX82_L, V
= +4.5V to +5.5V for MAX82_M, V
= +3.15V to +3.6V for MAX82_T, V
= +3V
CC
CC
CC
CC
to +3.6V for MAX82_S, V
= +2.7V to +3.6V for MAX82_R, V
= +2.38V to +2.75V for MAX82_Z, V
= +2.25V to +2.75V for
CC
CC
CC
MAX82_Y, T = T
to T
, T = -40 C to +85 C (SC70), T = -40 C to +125 C (SOT23), unless otherwise noted. Typical values
MAX A A
A
MIN
are at T = +25 C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +70°C
MIN
1.0
TYP
MAX
UNITS
T
T
5.5
A
Operating Voltage Range
V
CC
V
= T
to T
1.2
A
MIN
MAX
MAX823L/M
MAX824L/M
10
5
24
12
WDI and MR
unconnected
Supply Current
(SOT23 Only)
MAX823T/S/R/Z/Y
MAX824T/S/R/Z/Y
I
µA
µA
SUPPLY
MAX825L/M
4.5
3
12
8
MR unconnected
MAX825T/S/R/Z/Y
MAX823L/M
MAX824L/M
6
4
17
12
WDI and MR
unconnected
Supply Current
(SC70 Only)
MAX823T/S/R/Z/Y
MAX824T/S/R/Z/Y
I
SUPPLY
MAX825L/M
3
2
8
MR unconnected
MAX82_L
MAX825T/S/R/Z/Y
6
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
= +25°C
4.56
4.50
4.31
4.25
3.04
3.00
2.89
2.85
2.59
2.55
2.28
2.25
2.16
2.13
4.63
4.70
4.75
4.45
4.50
3.11
3.15
2.96
3.00
2.66
2.70
2.35
2.38
2.22
2.25
= T
to T
MIN
MAX
MAX
MAX
MAX
MAX
MAX
MAX
= +25°C
= T to T
4.38
3.08
2.93
2.63
2.32
2.19
MAX82_M
MAX82_T
MIN
= +25°C
= T to T
MIN
= +25°C
= T to T
Reset Threshold
V
RST
MAX82_S
V
MIN
= +25°C
= T to T
MAX82_R
MIN
= +25°C
= T to T
MAX82_Z
(SC70 only)
MIN
= +25°C
= T to T
MAX82_Y
(SC70 only)
MIN
2
_______________________________________________________________________________________
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
= +4.75V to +5.5V for MAX82_L, V
= +4.5V to +5.5V for MAX82_M, V
= +3.15V to +3.6V for MAX82_T, V
= +3V
CC
CC
CC
CC
to +3.6V for MAX82_S, V
= +2.7V to +3.6V for MAX82_R, V
= +2.38V to +2.75V for MAX82_Z, V
= +2.25V to +2.75V for
CC
CC
CC
MAX82_Y, T = T
to T
, T = -40 C to +85 C (SC70), T = -40 C to +125 C (SOT23), unless otherwise noted. Typical values
MAX A A
A
MIN
are at T = +25 C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
10
5
MAX
UNITS
MAX82_L/M
MAX82_T/S/R/Z/Y
Reset Threshold Hysteresis
mV
Reset Threshold Temperature
Coefficient
40
ppm/ C
Reset Timeout Period
t
140
200
20
280
ms
s
RP
V
to RESET Delay
V
- V
CC
= 100mV
CC
RST
MAX82_L/M, V
= V
max,
RST
CC
V
1.5
CC -
I
= 120 A
SOURCE
V
OH
MAX82_T/S/R/Z/Y, V
= V
max,
min,
CC
RST
0.8 ✕ V
CC
I
= 30 A
SOURCE
MAX82_L/M, V
= V
min,
RST
CC
0.4
0.3
0.3
I
= 3.2mA
SINK
RESET Output Voltage
V
MAX82_T/S/R/Z/Y V
= V
RST
CC
I
= 1.2mA
SINK
V
OL
T
V
= 0 C to +70 C, V
= 1V,
CC
= 50 A
A
falling, I
CC
SINK
T
= T
to T
, V
MAX CC
= 1.2V,
A
MIN
V
falling, V
= 0V, I
= 100 A
CC
BATT
SINK
MAX82_L/M, RESET = 0V, V
= 5.5V
800
400
CC
RESET Output Short-Circuit
Current (Note 2)
I
A
V
SOURCE
MAX82_T/S/R/Z/Y, RESET = 0V, V
= 3.6V
CC
V
V
> 1.8V, I
= 150 A
0.8 ✕ V
CC
OH
CC
SOURCE
MAX824L/M, MAX825L/M,
= V max, I = 3.2mA
0.4
0.3
V
RESET Output Voltage
CC
RST
SINK
V
OL
MAX824T/S/R/Z/Y, MAX825T/S/R/Z/Y,
V
= V
max, I
= 1.2mA
SINK
CC
RST
WATCHDOG INPUT (MAX823/MAX824)
Watchdog Timeout Period
WDI Pulse Width
t
1.12
50
1.60
2.40
s
WD
✕
t
V
= 0.4V, V = 0.8
V
CC
ns
WDI
IL
IH
✕
V
0.3
V
CC
IL
WDI Input Voltage (Note 3)
WDI Input Current (Note 4)
V
A
✕
V
0.7
V
CC
IH
WDI = V , time average
CC
120
-15
160
WDI = 0, time average
-20
_______________________________________________________________________________________
3
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
= +4.75V to +5.5V for MAX82_L, V
= +4.5V to +5.5V for MAX82_M, V
= +3.15V to +3.6V for MAX82_T, V
= +3V
CC
CC
CC
CC
to +3.6V for MAX82_S, V
= +2.7V to +3.6V for MAX82_R, V
= +2.38V to +2.75V for MAX82_Z, V
= +2.25V to +2.75V for
CC
CC
CC
MAX82_Y, T = T
to T
, T = -40 C to +85 C (SC70), T = -40 C to +125 C (SOT23), unless otherwise noted. Typical values
MAX A A
A
MIN
are at T = +25 C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MANUAL RESET INPUT (MAX823/MAX825)
✕
V
0.3
V
CC
IL
MR Input Voltage
V
s
✕
V
0.7
V
CC
IH
MR Pulse Width
1.0
MR Noise Immunity (pulse width
with no reset)
100
500
52
ns
ns
k
MR to Reset Delay
MR Pullup Resistance
(internal)
35
75
Note 1: Over-temperature limits are guaranteed by design and not production tested.
Note 2: The RESET short-circuit current is the maximum pullup current when RESET is driven low by a µP bidirectional reset pin.
Note 3: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 4: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is
designed to drive a three-stated output device with a 10µA maximum leakage current and a maximum capacitive load of
200pF. This output device must be able to source and sink at least 200µA when active.
4
_______________________________________________________________________________________
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
__________________________________________Typical Operating Characteristics
MAX823_, V
= +5V, T = +25°C, unless otherwise noted.)
A
CC
RESET TIMEOUT PERIOD
vs. TEMPERATURE
V
SUPPLY CURRENT
vs. TEMPERATURE
RESET COMPARATOR PROPAGATION DELAY
vs. TEMPERATURE
30
CC
250
240
9
8
7
6
5
4
3
2
1
(SC70 ONLY)
V
FALLING
CC
25
20
15
10
5
230
220
210
200
190
180
MAX823L
MAX824Y
MAX825R
170
160
150
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20 40 60 80 100 120
TEMPERATURE ( C)
-40 -20
0
20
40
60
80 100
TEMPERATURE ( C)
TEMPERATURE ( C)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD
VOLTAGE vs. TEMPERATURE
MAXIMUM V TRANSIENT DURATION
CC
vs. RESET THRESHOLD OVERDRIVE
50
45
40
35
30
25
20
15
10
5
2.0
1.9
1.06
1.04
1.02
1.00
0.98
0.96
0.94
(SC70 ONLY)
1.8
1.7
1.6
1.5
1.4
1.3
RESET OCCURS
ABOVE CURVE
MAX82_Y
1.2
1.1
1.0
MAX82_R
MAX82_L
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
0
20 40 60 80 100 120 140 160 180 200
TEMPERATURE ( C)
TEMPERATURE ( C)
RESET THRESHOLD OVERDRIVE (mV), V - V
RST
CC
_______________________________________________________________________________________
5
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
Pin Description
PIN
NAME
FUNCTION
MAX823
MAX824
MAX825
Active-Low Reset Output. Pulses low for 200ms when triggered, and remains
low whenever V
remains low for 200ms after one of the following occurs: V
reset threshold, the watchdog triggers a reset, or MR goes low to high.
is below the reset threshold or when MR is a logic low. It
CC
1
2
1
2
1
2
4
3
RESET
GND
rises above the
CC
Ground
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as
long as MR is held low and for 200ms after MR returns high. The active-low input
has an internal 52k pullup resistor. It can be driven from a CMOS logic line or
3
—
3
MR
shorted to ground with a switch. Leave open or connect to V if unused.
CC
—
RESET
Active-High Reset Output. Inverse of RESET.
Watchdog Input. If WDI remains either high or low for longer than the watch-
dog timeout period, the internal watchdog timer runs out and a reset is trig-
gered. The internal watchdog timer clears whenever reset is asserted, or
whenever WDI sees a rising or falling edge. If WDI is left unconnected or is
connected to a three-stated buffer output, the watchdog feature is disabled.
4
5
4
5
—
WDI
5
V
CC
Supply Voltage
V
CC
MAX823
MAX824
MAX825
RESET
RESET
GENERATOR
RESET
(MAX824/MAX825
ONLY)
V
CC
1.25V
MR
(MAX823/MAX825
ONLY)
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
WDI
(MAX823/MAX824
ONLY)
GND
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
Watchdog Input (MAX823/MAX824)
_______________Detailed Description
In the MAX823/MAX824, the watchdog circuit monitors
RESET Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX823/MAX824/MAX825 µP super-
visory circuits assert a reset to prevent code-execution
errors during power-up, power-down, and brownout
conditions. RESET is guaranteed to be a logic low for
the µP’s activity. If the µP does not toggle the watchdog
input (WDI) within t
(1.6s), reset asserts. The internal
WD
1.6s timer is cleared by either a reset pulse or by tog-
gling WDI, which detects pulses as short as 50ns.
While reset is asserted, the timer remains cleared and
does not count. As soon as reset is released, the timer
starts counting (Figure 3).
V
down to 1V. Once V
exceeds the reset thresh-
CC
CC
old, an internal timer keeps RESET low for the specified
Disable the watchdog function by leaving WDI uncon-
nected or by three-stating the driver connected to WDI.
The watchdog input is internally driven low during the
first 7/8 of the watchdog timeout period and high for the
last 1/8 of the watchdog timeout period. When WDI is
left unconnected, this internal driver clears the 1.6s
timer every 1.4s. When WDI is three-stated or uncon-
nected, the maximum allowable leakage current is
10µA and the maximum allowable load capacitance is
200pF.
reset timeout period (t ); after this interval, RESET
returns high (Figure 2).
RP
If a brownout condition occurs (V
dips below the
CC
reset threshold), RESET goes low. Each time RESET is
asserted it stays low for the reset timeout period. Any
time V
goes below the reset threshold the internal
CC
timer restarts. RESET both sources and sinks current.
RESET on the MAX824/MAX825 is the inverse of
RESET.
Manual Reset Input (MAX823/MAX825)
Many µP-based products require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. On the MAX823/
MAX825, a logic low on MR asserts reset. Reset remains
Applications Information
Watchdog Input Current
The MAX823/MAX824 WDI inputs are internally driven
through a buffer and series resistor from the watchdog
counter (Figure 1). When WDI is left unconnected, the
watchdog timer is serviced within the watchdog timeout
period by a low-high-low pulse from the counter chain.
For minimum watchdog input current (minimum overall
power consumption), leave WDI low for the majority of
the watchdog timeout period, pulsing it low-high-low
once within the first 7/8 of the watchdog timeout period
to reset the watchdog timer. If WDI is externally driven
high for the majority of the timeout period, up to 160µA
can flow into WDI.
asserted while MR is low, and for t (200ms nominal)
RP
after it returns high. MR has an internal 52k pullup
resistor, so it can be left open if not used. This input can
be driven with CMOS logic levels or with open-drain/
collector outputs. Connect a normally open momentary
switch from MR to GND to create a manual-reset func-
tion; external debounce circuitry is not required. If MR is
driven from long cables or the device is used in a noisy
environment, connect a 0.1µF capacitor from MR to
GND to provide additional noise immunity.
V
CC
V
CC
t
RST
V
V
RST
RST
1V
t
1V
RESET*
WDI
t
RP
RP
t
RD
RP
RESET
t
t
RP
WD
t
t
RESET
RD
GND
*RESET ON THE MAX824/MAX825 IS THE INVERSE OF RESET.
Figure 2. Reset Timing Diagram
Figure 3. MAX823/MAX824 Watchdog Timing Relationship
_______________________________________________________________________________________
7
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
An optional 0.1µF bypass capacitor mounted close to
CC
Interfacing to µPs with
Bidirectional Reset Pins
V
provides additional transient immunity.
The RESET output maximum pullup current is 800µA for
L/M versions (400µA for T/S/R/Z/Y versions). This allows
µPs with bidirectional resets, such as the 68HC11, to
force RESET low when the MAX823/MAX824/MAX825
are pulling RESET high (Figure 4).
Watchdog Software Considerations
(MAX823/MAX824)
One way to help the watchdog timer monitor software
execution more closely is to set and reset the watchdog
input at different points in the program, rather than
pulsing the watchdog input high-low-high or low-high-
low. This technique avoids a stuck loop, in which the
watchdog timer would continue to be reset inside the
loop, keeping the watchdog from timing out.
Negative-Going V
Transients
CC
These supervisors are relatively immune to short-
duration, negative-going V transients (glitches), which
CC
usually do not require the entire system to shut down.
Resets are issued to the µP during power-up, power-
down, and brownout conditions.
Figure 5 shows an example of a flow diagram where the
I/O driving the watchdog input is set high at the begin-
ning of the program, set low at the beginning of every
subroutine or loop, then set high again when the pro-
gram returns to the beginning. If the program should
hang in any subroutine, the problem would quickly be
corrected, since the I/O is continually set low and the
watchdog timer is allowed to time out, causing a reset
or interrupt to be issued. As described in the Watchdog
Input Current section, this scheme results in higher time
average WDI input current than does leaving WDI low
for the majority of the timeout period and periodically
pulsing it low-high-low.
The Typical Operating Characteristics show a graph of
the MAX823_’s Maximum V
Transient Duration vs.
CC
Reset Threshold Overdrive, for which reset pulses are
not generated. The graph was produced using nega-
tive-going V
pulses, starting at 5V and ending below
CC
the reset threshold by the magnitude indicated (reset
threshold overdrive). The graph shows the maximum
pulse width that a negative-going V
transient can
CC
typically have without triggering a reset pulse. As the
amplitude of the transient increases (i.e., goes farther
below the reset threshold), the maximum allowable
pulse width decreases.
V
CC
START
V
CC
SET WDI
HIGH
V
CC
MAX823
MAX824
MAX825
PROGRAM
CODE
V
CC
I
MAX = 800 A L, M
SOURCE
400 A T, S, R, Z, Y
RESET
GENERATOR
RESET
SUBROUTINE OR
PROGRAM LOOP
P
SET WDI LOW
GND
GND
RETURN
Figure 4. Interfacing to µPs with Bidirectional Resets
Figure 5. Watchdog Flow Diagram
8
_______________________________________________________________________________________
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
Typical Operating Circuit
____________________Chip Information
TRANSISTOR COUNT: 607
V
CC
PROCESS TECHNOLOGY: BiCMOS
V
CC
V
CC
RESET
WDI
RESET
I/O
MAX823
P
MR
MANUAL
RESET
GND
GND
Ordering Information (continued)
†
PART
TEMP. RANGE
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23-5
5 SC70-5
MAX824_EUK-T
MAX825_EXK-T
MAX825_EUK-T
5 SOT23-5
†Insert the desired suffix letter (from the Reset Threshold table) into
the blank to complete the part number. All devices are available in
tape-and-reel only. There is a 2,500 piece minimum order increment.
Marking Information
MARKING INFORMATION (TOP)
XXXX
(SC70 ONLY)
MARKING INFORMATION (TOP)
AAL = MAX823L
AAM = MAX823M
AAP = MAX823R
AAO = MAX823S
AAN = MAX823T
AAR = MAX823Y
AAQ = MAX823Z
AAS = MAX824L
AAT = MAX824M
AAW = MAX824R
AAV = MAX824S
AAU = MAX824T
AAY = MAX824Y
AAX = MAX824Z
AAZ = MAX825L
ABA = MAX825M
ABD = MAX825R
ABC = MAX825S
ABB = MAX825T
ABF = MAX825Y
ABE = MAX825Z
XXXX
(SOT ONLY)
AAAI = MAX823L
AAAJ = MAX823M
AAAK = MAX823T
AAAL = MAX823S
AAAM = MAX823R
AAAN = MAX824L
AAAO = MAX824M
AAAP = MAX824T
AAAQ = MAX824S
AAAR = MAX824R
AAAS = MAX825L
AAAT = MAX825M
AAAU = MAX825T
AAAV = MAX825S
AAAW= MAX825R
_______________________________________________________________________________________
9
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
Package Information
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.
10 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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