IMP183 4/A/D
Application Information
Table 1. Threshold Selection
3.3V Input
Tolerance Select
5VTOL = 5V
IN
5VTOL = GND
3.3VTOL = 3.3V
IN
3.3VTOL = GND
5V Input
MAX
—
—
2.64
2.97
3.3V
Tolerance
—
—
20%
10%
TRIP Point (V)
MIN
—
—
2.47
2.80
Nominal
—
—
2.55
2.88
5V
Tolerance
10%
5%
—
—
TRIP Point (V)
MIN
4.25
4.5
—
—
Nominal
4.38
4.63
—
—
MAX
4.49
4.75
—
—
1834_03t.eps
Manual Reset Operation
Pushbutton switch input, PBRST, allows the user to override the
internal trip point detection circuits and issue reset signals. The
pushbutton input is debounced and is pulled HIGH through a
40kΩ, internal pull-up resistor.
When at least one of the reset outputs is not asserted, a pushbut-
ton initiated reset signal can be issued by holding PBRST LOW for
at least 2ms. When PBRST is held LOW, both resets become active
and remain active for approximately 350ms after PBRST returns
HIGH. See
Figure 3
and
Figure 4.
5V
IMP1834
1
2
3
4
5V
IN
3.3V
IN
8
7
6
5
3.3V
t
PB
t
PDLY
V
IL
t
RST
RESET
V
OH
V
OL
1834_05.eps
PBRST
V
IH
5VRESET 3.3VRESET
5VTOL
GND
3.3VTOL
PBRST
1834_04.eps
RESET
(IMP1834D)
Figure 3. Pushbutton Reset
Figure 4. Timing Diagram: Pushbutton Reset
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
5
A1PROS [ A1 PROS CO., LTD. ]
