MAX961 Datasheet, PDF (8/12 Pages) Maxim Integrated Products – Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,Beyond-the-Rails Comparators

Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
DIFFERENTIAL
INPUT
V_OS
VOLTAGE
t_SU
t_H
V_CC
LE
V_CC
2
0V
t_PD
V_OH
Q
V_CC
2
V_OL
Q
V_CC
2
t_SKEW
Figure 2. MAX961/MAX963 Timing Diagram
200Ω
IN+
MAX961-MAX964
MAX997
MAX999
TO INTERNAL
CIRCUITRY
IN-
200Ω
TO INTERNAL
CIRCUITRY
t_LPW
t_LPD
t_SKEW
For a large differential input voltage (exceeding 3V_F),
this protection circuitry increases the input bias current
at IN+ (source) and IN- (sink).
(IN+ - IN-) - 3V_F
Input current = ————————
2 x 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 3. Input Stage Circuitry
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