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MAX6748 の電気的特性と機能

MAX6748のメーカーはMaxim Integratedです、この部品の機能は「uP Reset Circuits」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX6748
部品説明 uP Reset Circuits
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX6748 Datasheet, MAX6748 PDF,ピン配置, 機能
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/

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MAX6748 pdf, ピン配列
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +1.2V to +5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Fast Watchdog Timeout Period,
SET Ratio = 64,
(MAX6752/MAX6753)
tWD1
CSWT = 1500pF
CSWT = 100pF
11.38 15.18 18.98
1.01
ms
Fast Watchdog Minimum Period
(MAX6752/MAX6753)
SWT Ramp Current
SWT Ramp Threshold
RESET Output Voltage LOW
Open-Drain, Push-Pull
(Asserted)
RESET Output Voltage HIGH,
Push-Pull (Not Asserted)
RESET Output Leakage Current,
Open Drain
IRAMP
VRAMP
VOL
VOH
ILKG
VSWT = 0 to 1.23V, VCC = 1.6V to 5V
VCC = 1.6V to 5V (VRAMP rising)
VCC 1.0V, ISINK = 50µA
VCC 2.7V, ISINK = 1.2mA
VCC 4.5V, ISINK = 3.2mA
VCC 1.8V, ISOURCE = 200µA
VCC 2.25V, ISOURCE = 500µA
VCC 4.5V, ISOURCE = 800µA
VCC > VTH, reset not asserted,
VRESET = 5.5V
DIGITAL INPUTS (MR, SET0, SET1, WDI, WDS)
Input Logic Levels
MR Minimum Pulse Width
MR Glitch Rejection
MR to RESET Delay
MR Pullup Resistance
WDI Minimum Pulse Width
VIL
VIH
VCC 4.0V
VIL VCC < 4.0V
VIH
Pullup to VCC
RESET IN
RESET IN Threshold
RESET IN Leakage Current
RESET IN to RESET Delay
VRESET IN
IRESET IN
TA = -40°C to +125°C
RESET IN falling at 1mV/µs
2000
200 250
1.173 1.235
0.8 x VCC
0.8 x VCC
0.8 x VCC
300
1.297
0.3
0.3
0.4
1.0
ns
nA
V
V
V
µA
0.8
2.4
0.3 x VCC
0.7 x VCC
1
100
200
12 20 28
300
V
µs
ns
ns
k
ns
1.216
-50
1.235
±1
20
1.254
+50
V
nA
µs
Note 1: Production testing done at TA = +25°C. Over temperature limits are guaranteed by design.
_______________________________________________________________________________________ 3
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3Pages


MAX6748 電子部品, 半導体
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
MAX6746
MAX6747
PIN
MAX6748
MAX6751
MAX6752
MAX6753
5 5
——
5
666
777
888
Pin Description (continued)
NAME
FUNCTION
WDS
SET1
WDI
RESET
VCC
Watchdog Select Input. WDS selects the watchdog mode. Connect
WDS to ground to select normal mode and the watchdog timeout
period. Connect WDS to VCC to select extended mode, multiplying the
basic timeout period by a factor of 128. A change in the state of WDS
clears the watchdog timer.
Logic Input. SET1 selects the watchdog window ratio or disables the
watchdog timer. See Table 1.
Watchdog Input.
MAX6746MAX6751: A falling transition must occur on WDI within the
selected watchdog timeout period or a reset pulse occurs. The
watchdog timer clears when a transition occurs on WDI or whenever
RESET is asserted. Connect SWT to ground to disable the watchdog
timer function.
MAX6752/MAX6753: WDI falling transitions within periods shorter than
tWD1 or longer than tWD2 force RESET to assert low for the reset timeout
period. The watchdog timer begins to count after RESET is deasserted.
The watchdog timer clears when a valid transition occurs on WDI or
whenever RESET is asserted. Connect SET0 high and SET1 low to
disable the watchdog timer function. See the Watchdog Timer section.
Push/Pull or Open-Drain Reset Output. RESET asserts whenever VCC or
RESET IN drops below the selected reset threshold voltage (VTH or
VRESET IN, respectively) or manual reset is pulled low. RESET remains
low for the reset timeout period after all reset conditions are deasserted,
and then goes high. The watchdog timer triggers a reset pulse (tRP)
whenever a watchdog fault occurs.
Supply Voltage. VCC is the power-supply input and the input for fixed
threshold VCC monitor.
6 _______________________________________________________________________________________
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