MAX999EUK-T(2014) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX999EUK-T
(Rev.:2014)

Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyond-the-Rails Comparators

Maxim Integrated 

MAX961–MAX964/

MAX997/MAX999

Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,

Beyond-the-Rails Comparators

DIFFERENTIAL

INPUT

VOS

VOLTAGE

tSU

tH

VCC

LE

VCC

2

0V

tPD

VOH

Q

VCC

2

VOL

tLPW

tLPD

Q

VCC

2

Figure 2. MAX961/MAX963 Timing Diagram

200Ω

IN+

MAX961–MAX964

MAX997

MAX999

TO INTERNAL

CIRCUITRY

IN-

200Ω

TO INTERNAL

CIRCUITRY

tSKEW

tSKEW

For a large differential input voltage (exceeding 3VF), this

protection circuitry increases the input bias current at IN+

(source) and IN- (sink).

Input current = (IN+ − IN−) − 3VF

2 × 200

Input currents with large differential input voltages should

not be confused with input bias currents (IB). As long as

the differential input voltage is less than 3VF, this input

current is less than 2IB.

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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