MAX16016/MAX16020/MAX16021
Low-Power µP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
_______________________________________________________________________________________ 5
Note 2: All devices are 100% production tested at T
A
= +25°C and T
A
= +85°C. Limits to -40°C are guaranteed by design.
Note 3: V
BATT
can be 0V anytime, or V
CC
can go down to 0V if V
BATT
is active (except at startup).
Note 4: Use external current-limit resistor to limit current to 20mA (max).
Note 5: CEIN/CEOUT resistance is tested with V
CC
= 5V and V
CEIN
= 0V or 5V.
Note 6: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 7: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is
designed for a three-stated output device with a 10µA maximum leakage current and capable of driving a maximum capaci-
tive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.53V to 5.5V, V
BATT
= 3V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOW LINE (LL)
Low Line to Reset Threshold
Voltage
V
CC
falling (see Table 2) mV
V
CC
Falling to LL Delay V
CC
falling at 10V/ms 20 µs
V
CC
≥ 1.6V, I
SINK
= 1mA, LL asserted 0.3
LL Output Low Voltage V
OL
V
CC
≥ 1.2V, I
SINK
= 100µA, LL asserted 0.3
V
LL Output High Voltage (Push-
Pull Output)
V
OH
V
CC
= 0.9 x V
TH_LL
, I
SOURCE
= 100µA,
LL deasserted
V
OUT
-
0.3
V
Output Leakage Current V
LL
= 5.5V, LL deasserted 1 µA
BATTERY-OK INDICATOR (BATTOK, BATT_TEST)
BATTOK Threshold Inferred internally from BATT 2.508 2.6 2.673 V
BATTOK Output Voltage Low V
OL
V
CC
= 1.1 x V
TH
, I
SINK
= 1mA, reset
asserted
0.3 V
BATTOK Output High Voltage V
OH
V
CC
= 1.1 x V
TH
, I
SOURCE
= 100µA,
BATTOK asserted
V
OUT
-
0.3
V
BATTOK Output Leakage
Current
V
BATTOK
= 5.5V, deasserted 1 µA
BATT_TEST Output Low Voltage V
CC
= 1.1 x V
TH
, I
SINK
= 1mA 0.3 V
Table 1a. Reset Threshold Ranges
(MAX16016)
RESET THRESHOLD RANGES (V)
SUFFIX
MIN TYP MAX
L 4.508 4.63 4.906
M 4.264 4.38 4.635
T 2.991 3.08 3.239
S 2.845 2.93 3.080
R 2.549 2.63 2.755
Z 2.243 2.32 2.425
Y 2.117 2.19 2.288
W 1.603 1.67 1.733
V 1.514 1.575 1.639
Table 1b. Reset Threshold Ranges
(MAX16020/MAX16021)
RESET THRESHOLD RANGES (V)
SUFFIX
MIN TYP MAX
L 4.520 4.684 4.852
M 4.275 4.428 4.585
T 3.010 3.100 3.190
S 2.862 2.946 3.034
R 2.568 2.640 2.716
Z 2.260 2.323 2.390
Y 2.133 2.192 2.255
W 1.616 1.661 1.710
V 1.528 1.571 1.618
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