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MAX6361 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX6361
Description  SOT23, Low-Power μP Supervisory Circuits with Battery Backup
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6361 Datasheet(HTML) 5 Page - Maxim Integrated Products

   
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SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
_______________________________________________________________________________________
5
1.234
1.235
1.236
MAX6364
RESET IN THRESHOLD
vs. TEMPERATURE
TEMPERATURE (°C)
-40
20
40
-20
0
60
80
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
1.0
1.9
1.6
1.3
2.8
2.5
2.2
MAX6364
RESET IN TO RESET PROPAGATION DELAY
vs. TEMPERATURE
TEMPERATURE (°C)
-40
20
40
-20
0
60
80
VOD = 50mV
Pin Description
Detailed Description
The Typical Operating Circuit shows a typical connec-
tion for the MAX6361/MAX6363/MAX6364 family. OUT
powers the static random-access memory (SRAM). OUT
is internally connected to VCC if VCC is greater than the
reset threshold, or to the greater of VCC or VBATT when
VCC is less than the reset threshold. OUT can supply up
to 150mA from VCC. When VCC is higher than VBATT, the
BATT ON (MAX6363) output is low. When VCC is lower
than VBATT, an internal MOSFET connects the backup
battery to OUT. The on-resistance of the MOSFET is a
function of backup-battery voltage and is shown in the
Battery to Out On-Resistance vs. Temperature graph in
the Typical Operating Characteristics section.
Backup-Battery Input. When VCC falls below the reset threshold, BATT switches to OUT if VBATT is 20mV
greater than VCC. When VCC rises 20mV above VBATT, VCC switches to OUT. The 40mV hysteresis
prevents repeated switching if VCC falls slowly.
BATT
6
MAX6363 Battery-On Output. BATT ON goes high in battery backup mode.
BATT ON
MAX6364 Reset Input. When RESET IN falls below 1.235V, reset is asserted. Reset output remains
asserted as long as RESET IN is low and for at least 150ms (tRP) after RESET IN goes high.
RESET IN
Supply Voltage. Reset is asserted when VCC drops below the reset threshold voltage (VTH). Reset
remains asserted until VCC rises above VTH and for at least 150ms after VCC rises above VTH.
VCC
4
Output. OUT sources from VCC when it is above the reset threshold (VTH), and from the greater of VCC or
BATT when VCC is below VTH.
OUT
5
MAX6361 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains assert-
ed for at least 150ms (tRP) after MR transitions from low to high. Leave unconnected or connected to VCC
if not used.
MR
3
Ground
GND
2
PIN
Active-Low Reset Output (for L and P versions). RESET remains low while VCC is below the reset thresh-
old and for at least 150ms (tRP) after VCC rises above the reset threshold. RESET also asserts when MR
or RESET IN is low.
RESET
Active-High Reset Output (for H versions). RESET remains high while VCC is below the reset threshold
and for at least 150ms (tRP) after VCC rises above the reset threshold. RESET also asserts when MR or
RESET IN is low.
RESET
1
FUNCTION
NAME


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