Datasheet

For a large differential input voltage (exceeding 3V
F
), this
protection circuitry increases the input bias current at IN+
(source) and IN- (sink).
F
(IN IN ) 3V
Input current
2 200
+− − −
=
×
Input currents with large differential input voltages should
not be confused with input bias currents (I
B
). As long as
the differential input voltage is less than 3V
F
, this input
current is less than 2I
B
.
The input circuitry allows the MAX961–MAX964/MAX997/
MAX999’s input common-mode range to extend 100mV
beyond both power-supply rails. The output remains in
the correct logic state if one or both inputs are within the
common-mode range. Taking either input outside the
common-mode range causes the input to saturate and the
propagation delay to increase.
Figure 2. MAX961/MAX963 Timing Diagram
Figure 3. Input Stage Circuitry
t
H
t
SU
t
LPW
0V
V
CC
V
OS
DIFFERENTIAL
INPUT
VOLTAGE
LE
Q
Q
V
OL
V
OH
t
LPD
t
PD
t
SKEW
t
SKEW
V
CC
2
V
CC
2
V
CC
2
MAX961–MAX964
MAX997
MAX999
IN+
200Ω
TO INTERNAL
CIRCUITRY
IN-
200Ω
TO INTERNAL
CIRCUITRY
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
www.maximintegrated.com
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