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MAX6748 데이터시트 PDF




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부품번호 MAX6748 기능
기능 uP Reset Circuits
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MAX6748 데이터시트, 핀배열, 회로
19-2530; Rev 2; 8/03
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
General Description
The MAX6746–MAX6753 low-power microprocessor
(µP) supervisory circuits monitor single/dual system
supply voltages from 1.575V to 5V and provide maxi-
mum adjustability for reset and watchdog functions.
These devices assert a reset signal whenever the V CC
supply voltage or RESET IN falls below its reset thresh-
old or when manual reset is pulled low. The reset output
remains asserted for the reset timeout period after V CC
and RESET IN rise above the reset threshold. The reset
function features immunity to power-supply transients.
The MAX6746–MAX6753 have ±2% factory-trimmed
reset threshold voltages in approximately 100mV incre-
ments from 1.575V to 5.0V and/or adjustable reset
threshold voltages using external resistors.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746–MAX6751 contain a
watchdog select input that extends the watchdog time-
out period by 128x. The MAX6752/MAX6753 contain a
window watchdog timer that looks for activity outside an
expected window of operation.
The MAX6746–MAX6753 are available with a push-pull
or open-drain active-low RESET output. The MAX6746–
MAX6753 are available in an 8-pin SOT23 package and
are fully specified over the automotive temperature
range (-40°C to +125°C).
Applications
Medical Equipment
Automotive
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
Pin Configurations
TOP VIEW
RESET IN (MR) 1
SWT 2
SRT 3
GND 4
MAX6746–
MAX6751
8 VCC
7 RESET
6 WDI
5 WDS
SOT23-8
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
Pin Configurations continued at end of data sheet.
Features
o Factory-Set Reset Threshold Options from 1.575V
to 5V in ~100mV Increments
o Adjustable Reset Threshold Options
o Single/Dual Voltage Monitoring
o Capacitor-Adjustable Reset Timeout
o Capacitor-Adjustable Watchdog Timeout
o Min/Max (Windowed) Watchdog Option
o Manual Reset Input Option
o Guaranteed RESET Valid for VCC 1V
o 3.7µA Supply Current
o Push-Pull or Open-Drain RESET Output Options
o Power-Supply Transient Immunity
o Small 8-Pin SOT23 Packages
Ordering Information
PART
MAX6746KA_ _-T
MAX6747KA_ _-T
MAX6748KA-T
MAX6749KA-T
MAX6750KA_ _-T
MAX6751KA_ _-T
MAX6752KA_ _-T
MAX6753KA_ _-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
Note: “_ _” represents the two number suffix needed when
ordering the reset threshold voltage value for the
MAX6746/MAX6747 and MAX6750–MAX6753. The reset
threshold voltages are available in approximately 100mV incre-
ments. Table 2 contains the suffix and reset factory-trimmed
voltages. All devices are available in tape-and-reel only. There
is a 2500-piece minimum order increment for standard ver-
sions (see Table 3). Sample stock is typically held on standard
versions only. Nonstandard versions require a minimum order
increment of 10,000 pieces. Contact factory for availability.
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery,and ordering informationp, lease contact Maxim/Dallas Directa!t
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
http://www.Datasheet4U.com/




MAX6748 pdf, 반도체, 판매, 대치품
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
(VCC = +5V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
RESET TIMEOUT PERIOD vs. CSRT
10,000
1000
100
10
1
WATCHDOG TIMEOUT PERIOD vs. CSWT
100,000
MAX6746–MAX6751
10,000
1000
EXTENDED MODE
100
10 NORMAL MODE
1
0.1
100
1000 10,000
CSRT (pF)
100,000
0.1
100
1000 10,000
CSWT (pF)
100,000
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
6
5
4
3
2
1
0
123456
SUPPLY VOLTAGE (V)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.20
1.15
1.10
CSRT = 100pF
1.05
1.00
CSRT = 1500pF
0.95
0.90
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE
6
5 VCC = 5V
4
3 VCC = 1.8V
VCC = 3.3V
2
1
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
NORMALIZED WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
1.20
1.15
1.10
1.05 CSWT = 100pF
1.00
CSWT = 1500pF
0.95
0.90
0.85
0.80
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
NORMALIZED RESET IN THRESHOLD VOLTAGE
vs. TEMPERATURE
1.010
1.008 VCC = 5V
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
175
150
125
100 RESET OCCURS
ABOVE THE CURVE
75
50
25
0
0
VTH = 2.92V
200 400 600 800 1000
RESET THRESHOLD OVERDRIVE (mV)
RESET IN THRESHOLD
vs. SUPPLY VOLTAGE
1.240
1.239
1.238
1.237
1.236
1.235
1
2345
SUPPLY VOLTAGE (V)
6
4 _______________________________________________________________________________________
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MAX6748 전자부품, 판매, 대치품
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
tWD1 (MIN) tWD1 (MAX) tWD2 (MIN) tWD2 (MAX)
GUARANTEED
TO ASSERT
RESET
WDI CONDITION 1
WDI CONDITION 2
GUARANTEED TO
NOT ASSERT
GUARANTEED TO
ASSERT
RESET
RESET
*UNDETERMINED
*UNDETERMINED
FAST FAULT
NORMAL OPERATION
WDI CONDITION 3
SLOW FAULT
*UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION
Figure 1. MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship
Detailed Description
The MAX6746MAX6753 assert a reset signal whenever
the VCC supply voltage or RESET IN falls below its reset
threshold. The reset output remains asserted for the
reset timeout period after V CC and RESET IN rise above
its respective reset threshold. A watchdog timer triggers
a reset pulse whenever a watchdog fault occurs.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746 MAX6751 contain a
watchdog select input that extends the watchdog time-
out period to 128x.
The MAX6752 and MAX6753 have a sophisticated
watchdog timer that detects when the processor is run-
ning outside an expected window of operation. The
watchdog signals a fault when the input pulses arrive too
early (faster that the selected t WD1 timeout period) or too
late (slower than the selected t WD2 timeout period) (see
Figure 1).
RESET is guaranteed to be in the correct logic state for
VCC greater than 1V. For applications requiring valid
reset logic when V CC is less than 1V, see the section
Ensuring a Valid RESET Output Down to VCC = 0V.
RESET IN Threshold
The MAX6748MAX6751 monitor the voltage on RESET IN
using an adjustable reset threshold (V RESET IN) set with
an external resistor voltage-divider ( Figure 2). Use the
following formula to calculate the externally monitored
voltage (VMON_TH):
VMON_TH = VRESET IN x (R1 + R2) / R2
VMON_TH
R1 VCC
Reset Output
The reset output is typically connected to the reset input
of a µP. A µP s reset input starts or restarts the µP in a
known state. The MAX6746 MAX6753 µP supervisory
circuits provide the reset logic to prevent code-execu-
tion errors during power-up, power-down, and
brownout conditions (see t he Typical Operating Circuit ).
RESET changes from high to low whenever the moni-
tored voltage, RESET IN and/or V CC drop below the
reset threshold voltages. Once V RESET IN and/or V CC
exceeds its respective reset threshold voltage(s),
RESET remains low for the reset timeout period, then
goes high.
RESET IN
VCC
R2 MAX6748
MAX6749
MAX6750
GND MAX6751
VMON_TH = 1.235 x (R1 + R2) / R2
Figure 2. Calculating the Monitored Threshold Voltage
(VMON_TH)
_______________________________________________________________________________________ 7
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