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MAX6322 데이터시트 PDF




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부품번호 MAX6322 기능
기능 5-Pin uP Supervisory Circuits
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MAX6322 데이터시트, 핀배열, 회로
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
General Description
The MAX6316–MAX6322 family of microprocessor (µP)
supervisory circuits monitors power supplies and
microprocessor activity in digital systems. It offers sev-
eral combinations of push/pull, open-drain, and bidirec-
tional (such as Motorola 68HC11) reset outputs, along
with watchdog and manual reset features. The Selector
Guide below lists the specific functions available from
each device.
These devices are available in 26 factory-trimmed reset
threshold voltages (from 2.5V to 5V, in 100mV incre-
ments), featuring four minimum power-on reset timeout
periods (from 1ms to 1.12s), and four watchdog timeout
periods (from 6.3ms to 25.6s). Thirteen standard ver-
sions are available with an order increment requirement
of 2500 pieces (see Standard Versions table); contact
the factory for availability of other versions, which have
an order increment requirement of 10,000 pieces.
The MAX6316–MAX6322 are offered in a miniature
5-pin SOT23 package.
Benefits and Features
Integrated Configuration Enables Flexible Designs
Available in 26 Reset-Threshold Voltages
- 2.5V to 5V, in 100mV Increments
Four Reset Timeout Periods
- 1ms, 20ms, 140ms, or 1.12s (min)
Four Watchdog Timeout Periods
- 6.3ms, 102ms, 1.6s, or 25.6s (typ)
Four Reset Output Stages
- Active-High, Push/Pull
- Active-Low, Push/Pull
- Active-Low, Open-Drain
- Active-Low, Bidirectional
Integrated Features Increase Robustness
Guaranteed Reset Valid to VCC = 1V
Immune to Short-Negative VCC Transients
Saves Board Space
No External Components
Small 5-Pin SOT23 Package
Applications
Portable Computers
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Embedded Control Systems
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Selector Guide
Ordering Information
PART
TEMP RANGE
MAX6316LUK__ __- T -40°C to +125°C
MAX6316LUK__ __/ V + T -40°C to +125°C
MAX6316MUK__ __- T -40°C to +125°C
PIN-PACKAGE
5 SOT23
5 SOT23
5 SOT23
MAX6317HUK__ __- T
MAX6318HUK__ __- T
-40°C to +125°C 5 SOT23
-40°C to +125°C 5 SOT23
MAX6318MHUK__ __- T -40°C to +125°C 5 SOT23
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
/V Denotes an automotive-qualified part.
Ordering Information continued at end of data sheet.
PART
WATCHDOG
INPUT
MANUAL
RESET
INPUT
ACTIVE-LOW
PUSH/PULL
RESET OUTPUTS*
ACTIVE-HIGH ACTIVE-LOW
PUSH/PULL BIDIRECTIONAL
ACTIVE-LOW
OPEN-DRAIN
MAX6316L



MAX6316M


MAX6317H



MAX6318LH



MAX6318MH


MAX6319LH



MAX6319MH


MAX6320P


MAX6321HP


MAX6322HP


*The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.






19-0496; Rev 12; 4/15




MAX6322 pdf, 반도체, 판매, 대치품
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Typical Operating Characteristics
TA = +25°C, unless otherwise noted.)
MAX6316/MAX6317/MAX6318/MAX6320/MAX6321
SUPPLY CURRENT vs. TEMPERATURE
10
9
8 VCC = 5V
7
6
5
4 VCC = 3V
3
2
VCC = 1V
1
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
VCC FALLING TO RESET PROPAGATION
DELAY vs. TEMPERATURE
100
90
VCC FALLING AT 1mV/μs
VRST - VCC = 100mV
80
70
60
50
40
30
20
10
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
MAX6316/MAX6317/MAX6319/MAX6320/MAX6322
MANUAL RESET TO RESET
PROPAGATION DELAY vs. TEMPERATURE
320
300 VCC = 5V
280
260
240
220
200
180
160
140
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40
NORMALIZED RESET TIMEOUT
PERIOD vs. TEMPERATURE
-20 0 20 40 60 80
TEMPERATURE (°C)
100
MAX6316/MAX6317/MAX6318/MAX6320/MAX6321
NORMALIZED WATCHDOG TIMEOUT
PERIOD vs. TEMPERATURE
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
80
RESET OCCURS ABOVE LINES
70
VRST = 3.3V
60
50 VRST = 4.63V
40 VRST = 2.63V
30
20
10
0
10
100 1000
RESET THRESHOLD OVERDRIVE (mV) VRST - VCC
MAX6316M/6318MH/6319MH
BIDIRECTIONAL
PULLUP CHARACTERISTICS
MAX6316toc07
+5V
74HC05 4.7kΩ
100pF
INPUT
PASSIVE
4.7kΩ
PULLUP
2V/div
INPUT 74HC05
100pF
+5V
VCC
RESET
MR GND
RESET, ACTIVE
PULLUP
2V/div
RESET
INPUT
5V/div
200ns/div
www.maximintegrated.com
Maxim Integrated | 4

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MAX6322 전자부품, 판매, 대치품
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Bidirectional RESET Output
The MAX6316M/MAX6318MH/MAX6319MH are designed
to interface with µPs that have bidirectional reset pins,
such as the Motorola 68HC11. Like an open-drain output,
these devices allow the µP or other devices to pull the
bidirectional reset (RESET) low and assert a reset condi-
tion. However, unlike a standard open-drain output, it
includes the commonly specified 4.7kΩ pullup resistor
with a P-channel active pullup in parallel.
This configuration allows the MAX6316M/MAX6318MH/
MAX6319MH to solve a problem associated with µPs
that have bidirectional reset pins in systems where sev-
eral devices connect to RESET (Figure 3). These µPs
can often determine if a reset was asserted by an exter-
nal device (i.e., the supervisor IC) or by the µP itself
(due to a watchdog fault, clock error, or other source),
and then jump to a vector appropriate for the source of
the reset. However, if the µP does assert reset, it does
not retain the information, but must determine the
cause after the reset has occurred.
The following procedure describes how this is done in
the Motorola 68HC11. In all cases of reset, the µP pulls
RESET low for about four external-clock cycles. It then
releases RESET, waits for two external-clock cycles,
then checks RESET’s state. If RESET is still low, the µP
concludes that the source of the reset was external
and, when RESET eventually reaches the high state, it
jumps to the normal reset vector. In this case, stored-
state information is erased and processing begins from
scratch. If, on the other hand, RESET is high after a
delay of two external-clock cycles, the processor
knows that it caused the reset itself and can jump to a
different vector and use stored-state information to
determine what caused the reset.
A problem occurs with faster µPs; two external-clock
cycles are only 500ns at 4MHz. When there are several
devices on the reset line, and only a passive pullup resis-
tor is used, the input capacitance and stray capacitance
can prevent RESET from reaching the logic high state (0.8
5 VCC) in the time allowed. If this happens, all resets will
be interpreted as external. The µP output stage is guaran-
teed to sink 1.6mA, so the rise time can not be reduced
considerably by decreasing the 4.7kΩ internal pullup
resistance. See Bidirectional Pullup Characteristics in the
Typical Operating Characteristics.
The MAX6316M/MAX6318MH/MAX6319MH overcome
this problem with an active pullup FET in parallel with the
4.7kΩ resistor (Figures 4 and 5). The pullup transistor
holds RESET high until the µP reset I/O or the supervisory
circuit itself forces the line low. Once RESET goes below
VPTH, a comparator sets the transition edge flip-flop, indi-
cating that the next transition for RESET will be low to
high. When RESET is released, the 4.7kΩ resistor pulls
RESET up toward VCC. Once RESET rises above VPTH
but is below (0.85 x VCC), the active P-channel pullup
turns on. Once RESET rises above (0.85 x VCC) or the
2µs one-shot times out, the active pullup turns off. The
parallel combination of the 4.7kΩ pullup and the
VCC
VCC
WDI*
MR**
RESET***
RESET
CIRCUITRY
4.7kΩ
RESET
RESET
CIN CSTRAY
68HC11
CIN
RESET
CIRCUITRY
MAX6316M
MAX6318MH
MAX6319MH
* MAX6316M/MAX6318MH
** MAX6316M/MAX6319MH
*** ACTIVE-HIGH PUSH/PULL MAX6318MH/MAX6319MH
RESET
CIN
Figure 3. MAX6316M/MAX6318MH/MAX6319MH Supports Additional Devices on the Reset Bus
OTHER DEVICES
www.maximintegrated.com
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