MAX6386XS17D6-T 查看數據表（PDF） - Maxim Integrated
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MAX6386XS17D6-T Datasheet PDF : 10 Pages
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SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
VCC
VIN
MAX6387
MAX6388
R1
MAX6389
RESET IN
RESET
R2
(RESET)
GND
Figure 1. RESET IN Configuration
( ) IS FOR MAX6388
Reset Timeout Delay
SUFFIX
MIN
D1
1ms
D2
20ms
D3
140ms
D5
280ms
D6
560ms
D4
1120ms
D7
1200ms
MAX6390_ _D4
1120/140ms*
MAX6390_ _D7
1200/150ms*
*The MAX6390 has a 1120ms or 1200ms RESET timeout and a
140ms or 150ms manual reset timeout.
a negative-going pulse applied to VCC, starting above
the actual reset threshold and ending below it by the
magnitude indicated (reset comparator overdrive). The
graph indicates the typical maximum pulse width a neg-
ative-going VCC transient may have without causing a
reset pulse to be issued. As the magnitude of the tran-
sient increases (goes farther below the reset threshold),
the maximum allowable pulse width decreases. A 0.1µF
capacitor mounted as close as possible to VCC provides
additional transient immunity.
Ensuring a Valid RESET
Output Down to VCC = 0V
The MAX6381–MAX6390 are guaranteed to operate
properly down to VCC = 1V. In applications that require
valid reset levels down to VCC = 0V, a pulldown resistor
to active-low outputs (push/pull only, Figure 2) and a
pullup resistor to active-high outputs (push/pull only)
will ensure that the reset line is valid while the reset out-
put can no longer sink or source current. This scheme
VCC
MAX6381
MAX6384
MAX6387
RESET
R1
GND
100k
Figure 2. RESET Valid to VCC = Ground Circuit
does not work with the open-drain outputs of the
MAX6383/MAX6386/MAX6389/MAX6390. The resistor
value used is not critical, but it must be small enough
not to load the reset output when VCC is above the
reset threshold. For most applications, 100kΩ is ade-
quate.
PART
MAX638_
MAX6390
Standard Versions
RESET
THRESHOLD
46
44
31
29
26
23
22
17
16
46
44
31
29
26
23
22
17
16
RESET TIMEOUT
D3
D4
7
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