Datasheet
currents, holding RESET low (Figure 4). The pull-down
resistor’s value is not critical; 100kΩ is large enough not
to load RESET and small enough to pull RESET to
ground. For applications where RESET must be valid to
V
CC
, a 100kΩ pull-up resistor between RESET and V
CC
will hold RESET high when V
CC
falls below 1V (Figure 5).
Since the MAX6305/MAX6306/MAX6307 have open-
drain, active-low outputs, they typically use a pull-up
resistor. With these devices and under these conditions
(V
CC
< 1V), RESET will most likely not maintain an
active condition, but will drift toward a nonactive level
due to the pull-up resistor and the RESET output’s
reduction in sinking capability. These devices are not
recommended for applications that require a valid
RESET output below 1V.
SUFFIX
T
A
= +25°C T
A
= -40°C to +85°C
00
Preprogrammed Threshold
Not Available
Preprogrammed
Threshold Not
Available
50 4.925 5.000 5.075 4.875 5.125
49 4.827 4.900 4.974 4.778 5.023
48 4.728 4.800 4.872 4.680 4.920
47 4.630 4.700 4.771 4.583 4.818
46 4.561 4.630 4.699 4.514 4.746
45 4.433 4.500 4.568 4.388 4.613
44 4.314 4.380 4.446 4.270 4.490
43 4.236 4.300 4.365 4.193 4.408
42 4.137 4.200 4.263 4.095 4.305
41 4.039 4.100 4.162 3.998 4.203
40 3.940 4.000 4.060 3.900 4.100
39 3.842 3.900 3.959 3.803 3.998
38 3.743 3.800 3.857 3.705 3.895
37 3.645 3.700 3.756 3.608 3.793
36 3.546 3.600 3.654 3.510 3.690
35 3.448 3.500 3.553 3.413 3.588
34 3.349 3.400 3.451 3.315 3.485
33 3.251 3.300 3.350 3.218 3.383
32 3.152 3.200 3.248 3.120 3.280
31 3.034 3.080 3.126 3.003 3.157
30 2.955 3.000 3.045 2.925 3.075
29 2.886 2.930 2.974 2.857 3.000
28 2.758 2.800 2.842 2.730 2.870
27 2.660 2.700 2.741 2.633 2.768
26 2.591 2.630 2.669 2.564 2.696
25 2.463 2.500 2.538 2.438 2.563
*
Factory-trimmed reset thresholds are available in approximately
100mV increments with a ±1.5% room-temperature variance.
MIN TYP MAX
MIN MAX
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
8
MAX6308
MAX6309
MAX6310
GND
100k
V
CC
V
CC
RESET
MAX6311
MAX6312
MAX6313
GND
100k
V
CC
V
CC
RESET
Figure 4. Ensuring RESET Valid to V
CC
= 0V
Figure 5. Ensuring RESET Valid to V
CC
= 0V
Table 1. Factory-Trimmed Reset
Thresholds*