MAX3946 查看數據表（PDF） - Maxim Integrated

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MAX3946

1Gbps to 11.3Gbps, SFP+ Laser Driver with Laser Impedance Mismatch Tolerance

Maxim Integrated 

1Gbps to 11.3Gbps, SFP+ Laser Driver

with Laser Impedance Mismatch Tolerance

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.85V to +3.63V, TA = -40°C to +85°C, and Figure 1. Guaranteed by design and characterization from TA = -40°C to +95°C.

Typical values are at VCC = +3.3V, IBIAS = 60mA, IMOD = 40mA, 25I differential output load, and TA = +25°C, unless otherwise

noted.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

CONTROL I/O SPECIFICATIONS

DISABLE Input Current

IIH

IIL

Depends on pullup resistance

DISABLE Input High Voltage

VIH

DISABLE Input Low Voltage

VIL

DISABLE Input Resistance

RPULL Internal pullup resistor

3-WIRE DIGITAL I/O SPECIFICATIONS (SDA, SCL, CSEL)

Input High Voltage

VIH

Input Low Voltage

VIL

Input Hysteresis

VHYST

Input Leakage Current

IIL, IIH

VIN = 0V or VCC, internal pullup or

pulldown is 75kI typical

MIN TYP MAX UNITS

12

FA

500 800

1.8

VCC

V

0

0.8

V

4.7

7.5

10

kI

2.0

VCC

V

0.8

V

80

mV

150

FA

Output High Voltage

VOH External pullup is (4.7kI to 10kI) to VCC VCC - 0.5

V

Output Low Voltage

VOL External pullup is (4.7kI to 10kI) to VCC

0.4

V

3-WIRE DIGITAL INTERFACE TIMING CHARACTERISTICS (Figure 5)

SCL Clock Frequency

fSCL

400 1000 kHz

SCL Pulse-Width High

tCH

0.5

Fs

SCL Pulse-Width Low

tCL

0.5

Fs

SDA Setup Time

tDS

100

ns

SDA Hold Time

tDH

100

ns

SCL Rise to SDA Propagation

Time

tD

5

ns

CSEL Pulse-Width Low

CSEL Leading Time Before the

First SCL Edge

tCSW

tL

500

ns

500

ns

CSEL Trailing Time After the Last

SCL Edge

tT

500

ns

SDA, SCL Load

CB

Total bus capacitance on one line with

4.7kI pullup to VCC

20

pF

Note 2: Guaranteed by design and characterization (TA = -40NC to +95NC).

Note 3: BIAS is connected to 2.0V. TOUT+/TOUT- are connected through pullup inductors to a separate supply that is equal to VCCT.

Note 4: Stability is defined as [(I_measured) - (I_reference)]/(I_reference) over the listed current range, temperature, and VCC =

VCCREF Q5%. VCCREF = 3.0V to 3.45V. Reference current measured at VCCREF, TA = +25NC.

Note 5: Measured with K28.5 data pattern at 10.7Gbps and with a (27 - 1 PRBS + 72 zeros + 27 - 1 PRBS (inverted) + 72 ones)

pattern at 11.3Gbps.

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