MAX6363LUT44 datasheet(5/8 Pages) MAXIM

Part #	MAX6363LUT44

Description	SOT23, Low-Power 關P Supervisory Circuits with Battery Backup

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Manufacturer	MAXIM [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

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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