IMP1834/A/D
Application Information
Table 1. Threshold Selection
3.3V Input
TRIP Point (V)
5V Input
Tolerance Select
TRIP Point (V)
3.3V
5V
Tolerance
Tolerance
MIN
—
Nominal
—
MAX
—
MIN
4.25
4.5
—
Nominal
4.38
4.63
—
MAX
4.49
4.75
—
5VTOL = 5VIN
—
—
10%
5%
—
5VTOL = GND
—
—
—
3.3VTOL = 3.3VIN
3.3VTOL = GND
20%
10%
2.47
2.80
2.55
2.88
2.64
2.97
—
—
—
—
1834_03t.eps
Manual Reset Operation
Pushbutton switch input, PBRST, allows the user to override the When at least one of the reset outputs is not asserted, a pushbut-
internal trip point detection circuits and issue reset signals. The ton initiated reset signal can be issued by holding PBRST LOW for
pushbutton input is debounced and is pulled HIGH through a at least 2ms. When PBRST is held LOW, both resets become active
40kΩ, internal pull-up resistor.
and remain active for approximately 350ms after PBRST returns
HIGH. See Figure 3 and Figure 4.
5V
3.3V
tPB
IMP1834
PBRST
V
IH
tPDLY
8
7
6
5
1
2
3
4
5VIN
3.3VIN
V
IL
5VRESET 3.3VRESET
tRST
5VTOL
GND
3.3VTOL
PBRST
RESET
VOH
VOL
RESET
1834_05.eps
(IMP1834D)
1834_04.eps
Figure 3. Pushbutton Reset
Figure 4. Timing Diagram: Pushbutton Reset
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
5
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