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PDF MAX806 Data sheet ( Hoja de datos )
| Número de pieza | MAX806 | |
| Descripción | Microprocessor Supervisory Circuits | |
| Fabricantes | Maxim Integrated | |
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19-4333; Rev 3; 9/93
Microprocessor Supervisory Circuits
__________________General Description
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
reduce the complexity and number of components
required for power-supply monitoring and battery-control
functions in microprocessor (µP) systems. They signifi-
cantly improve system reliability and accuracy compared
to separate ICs or discrete components.
These parts provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS
µP, or other low-power logic.
3) A reset pulse if the optional watchdog timer has not
been toggled within 1.6sec.
4) A 1.25V threshold detector for power-fail warning or
low-battery detection, or to monitor a power supply
other than +5V.
The parts differ in their reset-voltage threshold levels
and reset outputs. The MAX690A/MAX802L/MAX805L
generate a reset pulse when the supply voltage drops
below 4.65V, and the MAX692A/MAX802M generate a
reset below 4.40V. The MAX802L/MAX802M guaran-
tee power-fail accuracies to ±2%. The MAX805L is the
same as the MAX690A except that RESET is provided
instead of RESET.
All parts are available in 8-pin DIP and SO packages.
The MAX690A/MAX802L are pin compatible with the
MAX690 and MAX694. The MAX692A/MAX802M are
pin compatible with the MAX692.
_______________________Applications
Battery-Powered Computers and Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
__________Typical Operating Circuit
UNREGULATED DC REGULATED +5V
O.1µF
R1
R2
3.6V
LITHIUM
BATTERY
VCC RESET
PFO
PFI
WDI
VBATTGNDVOUT
MAX690A
MAX802L
VCC
RESET
NMI µP
I/O LINE GND
VCC
CMOS
RAM
GND
___________________________Features
o Precision Supply-Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
o Reset Time Delay – 200ms
o Watchdog Timer – 1.6sec Timeout
o Battery-Backup Power Switching
o 200µA Quiescent Supply Current
o 50nA Quiescent Supply Current in Battery-
Backup Mode
o Voltage Monitor for Power-Fail or Low-Battery
Warning
o Power-Fail Accuracy Guaranteed to ±2%
(MAX802L/M)
o Guaranteed RESET Assertion to VCC = 1V
o 8-Pin SO and DIP Packages
______________Ordering Information
PART
MAX690ACPA
MAX690ACSA
MAX690AC/D
MAX690AEPA
MAX690AESA
MAX690AMJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
Ordering Information continued on last page.
* Dice are specified at TA = +25°C
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
TOP VIEW
VOUT 1
VCC 2
GND 3
PFI 4
MAX690A
MAX692A
MAX802L
MAX802M
MAX805L
8 VBATT
7 RESET (RESET)
6 WDI
5 PFO
DIP/SO
( ) ARE FOR MAX805L ONLY.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
Microprocessor Supervisory Circuits
______________________________________________________________Pin Description
PIN
MAX690A/MAX692A
MAX802L/MAX802M
MAX805L
NAME
FUNCTION
Supply Output for CMOS RAM. When VCC is above the reset threshold,
1
1
VOUT
VOUT connects to VCC through a P-channel MOSFET switch. When VCC
is below the reset threshold, the higher of VCC or VBATT will be
connected to VOUT.
2 2 VCC +5V Supply Input
3 3 GND Ground
4 4 PFI Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes
low. Connect PFI to GND or VCC when not used.
5
5
PFO
Power-Fail Output. When PFI is less than 1.25V, PFO goes low;
otherwise PFO stays high.
Watchdog Input. If WDI remains high or low for 1.6sec, the internal
watchdog timer runs out and reset is triggered. If WDI is left floating or
6 6 WDI connected to a high-impedance three-state buffer, the watchdog
feature is disabled. The internal watchdog timer clears whenever reset
is asserted, WDI is three-stated, or WDI sees a rising or falling edge.
Reset Output. Whenever RESET is triggered, it pulses low for 200ms. It
stays low when VCC is below the reset threshold (4.65V in the
7 RESET MAX690A/MAX802L and 4.4V in the MAX692A/MAX802M) and remains
low for 200ms after VCC rises above the reset threshold. A watchdog
timeout also triggers RESET.
Active-High Reset Output is the inverse of RESET. When RESET is
– 7 RESET asserted, the RESET output voltage = VCC or VBATT, whichever is
higher.
Backup-Battery Input. When VCC falls below the reset threshold, VBATT
8
8
VBATT
will be switched to VOUT if VBATT is 20mV greater than VCC. When VCC
rises to 20mV above VBATT, VOUT will be reconnected to VCC. The 40mV
hysteresis prevents repeated switching if VCC falls slowly.
_______________________________________________________________________________________ 5
5 Page 
Microprocessor Supervisory Circuits
________________________µP Supervisory Circuits
Part
Number
Nominal
Reset
Threshold
(V)
Minimum
Reset
Pulse
Width
(ms)
Nominal
Watchdog
Timeout Backup-
Period Battery
(sec)
Switch
CE -
Write
Protect
Power-
Fail
Com-
parator
MAX690A/692A 4.65/4.40 140
1.6
MAX691A/693A 4.65/4.40 140/adj. 1.6/adj.
/10ns
MAX696
Adj.
35/adj.
1.6/adj.
MAX697
Adj.
35/adj.
1.6/adj.
MAX700
4.65/adj.
200
-
MAX703/704 4.65/4.40 140
-
MAX705/706 4.65/4.40 140
1.6
MAX706P
2.63
140 1.6
MAX706R/S/T
2.63/2.93/
3.08
140
1.6
MAX707/708 4.65/4.40 140
-
MAX708R/S/T
2.63/2.93/
3.08
140
-
MAX709L/M/
R/S/T
4.65/4.40/ 140
2.63/2.93/3.08
-
MAX791 4.65 140 1
/10ns
MAX792L/M/
R/S/T
4.65/4.40/ 140
2.63/2.93/3.08
1
/10ns
MAX800L/M 4.60/4.40 140
1.6/adj.
/10ns /±2%
MAX802L/M 4.60/4.40 140
1.6
/±2%
MAX805L
4.65
140 1.6
MAX813L
4.65
140 1.6
MAX820L/M/
R/S/T
4.65/4.40/ 140
2.63/2.93/3.08
1
/10ns /±2%
MAX1232
4.37/4.62 250
0.15/0.60/1.2
MAX1259
-
--
Manual- Watch- Low-
Reset dog Line
Input Output Output
Active- Battery-
High On
Reset Output
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX806.PDF ] | |
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