MAX6887BETE-T Maxim Integrated, MAX6887BETE-T Datasheet - Page 8

• Manufacturer Part Number: MAX6887BETE-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6887, MAX6888r

Specifications of MAX6887BETE-T

• Number Of Voltages Monitored: 6
• Undervoltage Threshold: 4.62 V, 3.06 V, 2.31 V, 0.557 V, 0.557 V, 0.557 V
• Overvoltage Threshold: 5.36 V, 3.54 V, 2.68 V, 0.643 V, 0.643 V, 0.643 V
• Manual Reset: Resettable
• Watchdog: Watchdog
• Supply Voltage - Max: 5.8 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFN EP
• Maximum Power Dissipation: 1667 mW
• Minimum Operating Temperature: - 40 C
• Supply Current (typ): 900 uA
• Supply Voltage - Min: 2.7 V

Hex/Quad, Power-Supply Supervisory Circuits
detector input (IN1–IN6) to monitor a user-defined sup-
ply voltage:
where V
Use the following procedure to design the proper volt-
age-divider and calculate thresholds:
1) Pick a value for R2. Use the equation above with
2) To find the actual undervoltage and overvoltage
Table 1. MAX6887 Threshold Options
8
MAX6887AETE
MAX6887BETE
MAX6887CETE
MAX6887DETE
MAX6887EETE
MAX6887FETE
MAX6887GETE
MAX6887HETE
MAX6887QETE
MAX6887IETE
MAX6887JETE
MAX6887KETE
MAX6887LETE
MAX6887METE
MAX6887NETE
MAX6887OETE
MAX6887PETE
MAX6887RETE
_______________________________________________________________________________________
the desired supply voltage to be monitored and
solve for R1. Use high-value resistors R1 and R2 to
minimize current consumption due to low leakage
currents.
thresholds, use the following equations:
PART
MON
V
V
ACTUALUV
ACTUALOV
is the desired voltage to be monitored.
0 6
. V
4.620
4.620
4.620
3.060
3.060
3.060
3.060
3.060
0.557
4.380
4.380
4.380
2.880
2.880
2.880
2.880
2.880
0.527
IN1
=
V
=
=
MON
V
V
MON
MON
3.060
3.060
3.060
2.310
2.310
2.310
2.310
1.670
0.557
2.880
2.880
2.880
2.190
2.190
2.190
2.190
1.580
0.527
IN2
×
⎛
⎜
⎝
×
×
UV THRESHOLDS (V)
R
⎛
⎜
⎝
1
⎛
⎜
⎝
R
V
+
V
2.310
2.310
1.670
1.670
1.670
1.390
0.557
0.557
0.557
2.190
2.190
1.580
1.580
1.580
1.310
0.527
0.527
0.527
2
REFUV
REFOV
R
0 6
IN3
0 6
.
2
.
⎞
⎟
⎠
V
V
⎞
⎟
⎠
⎞
⎟
⎠
1.670
0.557
0.557
1.390
0.557
0.557
0.557
0.557
0.557
1.580
0.527
0.527
1.310
0.527
0.527
0.527
0.527
0.527
IN4
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.527
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.527
IN5
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.527
0.557
0.557
0.557
0.557
0.557
0.557
0.557
0.527
V
age thresholds listed in Tables 1 and 2 that allow
adjustable thresholds. Their values are based on toler-
ances of ±7.5% and ±12.5% from a 0.6V reference.
See the Selector Guide to find which thresholds in
Tables 1 and 2 are adjustable.
Many µP-based products require manual reset capability
to allow an operator or external logic circuitry to initiate a
reset. The manual reset input (MR) can be connected
directly to a switch without an external pullup resistor or
debouncing network. MR is internally pulled up to BP.
Leave unconnected if not used. MR is internally pulled
up to BP through a 10µA current source. MR is designed
to reject fast, falling transients (typically 100ns pulses)
and MR must be held low for a minimum of 1µs to assert
RESET. Connect a 0.1µF capacitor from MR to ground to
provide additional noise immunity. After MR transitions
from low to high, RESET remains asserted for the dura-
tion of its time delay.
MARGIN allows system-level testing while power sup-
plies exceed the normal operating ranges. Drive
MARGIN low to hold RESET, OV, and WDO in their
IN6
REFUV
5.360
5.360
5.360
3.540
3.540
3.540
3.540
3.540
0.643
5.620
5.620
5.620
3.700
3.700
3.700
3.700
3.700
0.673
and V
IN1
REFOV
3.540
3.540
3.540
2.680
2.680
2.680
2.680
1.930
0.643
3.700
3.700
3.700
2.810
2.810
2.810
2.810
2.020
0.673
IN2
Margin Output Disable (MARGIN)
OV THRESHOLDS (V)
are the undervoltage and overvolt-
2.680
2.680
1.930
1.930
1.930
1.610
0.643
0.643
0.643
2.810
2.810
2.020
2.020
2.020
1.680
0.673
0.673
0.673
IN3
1.930
0.643
0.643
1.610
0.643
0.643
0.643
0.643
0.643
2.020
0.673
0.673
1.680
0.673
0.673
0.673
0.673
0.673
IN4
Manual Reset (MR)
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.673
0.673
0.673
0.673
0.673
0.673
0.673
0.673
0.673
IN5
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.643
0.673
0.673
0.673
0.673
0.673
0.673
0.673
0.673
0.673
IN6