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PDF MAX6319 Data sheet ( Hoja de datos )
| Número de pieza | MAX6319 | |
| Descripción | 5-Pin uP Supervisory Circuits | |
| Fabricantes | Maxim Integrated | |
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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
1 page  
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Pin Description
PIN
MAX6316L
MAX6316M
MAX6320P
MAX6317H
MAX6318LH
MAX6318MH
MAX6321HP
MAX6319LH
MAX6319MH
MAX6322HP
1—1
1
—1 3 3
2222
3 3—4
4 4 4—
5555
NAME
RESET
RESET
GND
MR
WDI
VCC
FUNCTION
MAX6316L/MAX6318LH/MAX6319LH:
Active-Low, Reset Output. CMOS push/pull
output (sources and sinks current).
MAX6316M/MAX6318MH/MAX6319MH:
Bidirectional, Active-Low, Reset Output.
Intended to interface directly to microprocessors
with bidirectional resets such as the Motorola
68HC11.
MAX6320P/MAX6321HP/MAX6322HP:
Open-Drain, Active-Low, Reset Output. NMOS out-
put (sinks current only). Connect a pullup resistor
from RESET to any supply voltage up to 6V.
Active-High, Reset Output. CMOS push/pull output
(sources and sinks current). Inverse of RESET.
Ground
Active-Low, Manual Reset Input. Pull low to force a
reset. Reset remains asserted for the duration of
the Reset Timeout Period after MR transitions from
low to high. Leave unconnected or connected to
VCC if not used.
Watchdog Input. Triggers a reset if it remains
either high or low for the duration of the watchdog
timeout period. The internal watchdog timer clears
whenever a reset asserts or whenever WDI sees a
rising or falling edge. To disable the watchdog fea-
ture, leave WDI unconnected or three-state the dri-
ver connected to WDI.
Supply Voltage. Reset is asserted when VCC
drops below the Reset Threshold Voltage (VRST).
Reset remains asserted until VCC rises above
VRST and for the duration of the Reset Timeout
Period (tRP) once VCC rises above VRST.
www.maximintegrated.com
Maxim Integrated | 5
5 Page 
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Figure 10 shows an example of a flow diagram where
the I/O driving the watchdog input is set high at the
beginning of the program, set low at the end 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 be quickly
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 current than does leaving WDI low for the
majority of the timeout period and periodically pulsing it
low-high-low.
START
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
POSSIBLE
INFINITE LOOP PATH
Pin Configurations
TOP VIEW
RESET 1
GND 2
MAX6316
MAX6320
5 VCC
RESET 1
GND 2
MAX6317
5 VCC
MR 3
4 WDI
SOT23
MR 3
4 WDI
SOT23
RETURN
Figure 10. Watchdog Flow Diagram
Typical Operating Circuit
VIN
MANUAL
RESET
VCC
RESET
MAX6316
MR WDI
GND
VCC
RESET
μP
I/O
GND
RESET 1
GND 2
MAX6318
MAX6321
5 VCC
RESET 1
MAX6319
GND 2 MAX6322
5 VCC
RESET 3
4 WDI RESET 3
4 MR
SOT23
SOT23
www.maximintegrated.com
Maxim Integrated | 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX6319.PDF ] | |
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