MAX809MEUR/GH9-T Maxim Integrated, MAX809MEUR/GH9-T Datasheet - Page 5

• Manufacturer Part Number: MAX809MEUR/GH9-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX803L, MAX803M, MAX803R, MAX803S, MAX803T, MAX803Z, MAX809J, MAX809L, MAX809M, MAX809R, MAX809S, MAX809T, MAX809Z, MAX810L, MAX810M, MAX810R, MAX810S, MAX810T, MAX810Zr

Specifications of MAX809MEUR/GH9-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.5 V, 3 V, 3.3 V, 5 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 240 ms
• Supply Voltage - Max: 5.5 V
• Chip Enable Signals: No
• Maximum Power Dissipation: 320 mW
• Power Fail Detection: No
• Supply Voltage - Min: 1.2 V

A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX803/MAX809/MAX810 assert
reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a
reset signal whenever the V
below a preset threshold, keeping it asserted for at
least 140ms after V
old. The MAX803 uses an open-drain output, and the
MAX809/MAX810 have a push-pull output stage.
Connect a pullup resistor on the MAX803’s RESET out-
put to any supply between 0 and 6V.
Maxim Integrated
PIN
MAX803L
MAX803M
MAX803T
MAX803S
MAX803R
MAX803Z
MAX809L
MAX809M
MAX809J
MAX809T
MAX809S
MAX809R
MAX809Z
MAX810L
MAX810M
MAX810T
MAX810S
MAX810R
MAX810Z
PART/SUFFIX
1
2
3
(MAX810)
(MAX803/
MAX809)
RESET
RESET
NAME
GND
V
CC
RESET THRESHOLD (V)
CC
Ground
RESET Output remains low while V
is below the reset threshold, and for at
least 140ms after V
reset threshold.
RESET Output remains high while V
is below the reset threshold, and for at
least 140ms after V
reset threshold.
Supply Voltage (+5V, +3.3V, +3.0V, or
+2.5V)
Detailed Description
has risen above the reset thresh-
4.63
4.38
3.08
2.93
2.63
2.32
4.63
4.38
4.00
3.08
2.93
2.63
2.32
4.63
4.38
3.08
2.93
2.63
2.32
CC
3-Pin Microprocessor Reset Circuits
Pin Description
supply voltage declines
FUNCTION
CC
CC
rises above the
rises above the
CC
CC
OPEN-DRAIN RESET
OPEN-DRAIN RESET
OPEN-DRAIN RESET
OPEN-DRAIN RESET
OPEN-DRAIN RESET
OPEN-DRAIN RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
PUSH-PULL RESET
MAX803/MAX809/MAX810
OUTPUT TYPE
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX803/
MAX809/MAX810 are relatively immune to short-duration
negative-going V
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX803/MAX809/
MAX810 do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to V
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going V
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, for
the MAX8__L and MAX8__M, a V
100mV below the reset threshold and lasts 20µs or less
will not cause a reset pulse. A 0.1µF bypass capacitor
mounted as close as possible to the V
additional transient immunity.
When V
no longer sinks current—it becomes an open circuit.
CC
falls below 1V, the MAX809 RESET output
Negative-Going V
Applications Information
CC
Ensuring a Valid Reset Output
transients (glitches).
CWAA
ACAA
ADAA
AGAA
AHAA
AAAA
ABAA
AKAA
AFAA
AJAA
ALAA
SOT
CC
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
transient can have without
TOP MARK
Selector Guide
Down to V
CC
transient that goes
CC
CC
Transients
pin provides
SC70
AAW
ABC
ABD
AAN
AAO
AAQ
AAU
AAZ
ABA
ABB
ABE
AAP
AAR
AAS
AAV
AAX
AAY
AAT
⎯
CC
= 0V
CC
5
,