High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Table 15.4 100BASE-TX Transceiver Characteristics

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

 

 

 

 

 

 

 

Overshoot and Undershoot

VOS

-

-

5

%

 

Jitter

 

 

 

1.4

nS

Note 15.9

 

 

 

 

 

 

 

Note 15.7 Measured at line side of transformer, line replaced by 100Ω (+/- 1%) resistor. Note 15.8 Offset from 16nS pulse width at 50% of pulse peak.

Note 15.9 Measured differentially.

Table 15.5 10BASE-T Transceiver Characteristics

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

 

 

 

 

 

 

 

Transmitter Peak Differential Output Voltage

VOUT

2.2

2.5

2.8

V

Note 15.10

Receiver Differential Squelch Threshold

VDS

300

420

585

mV

 

Note 15.10 Min/max voltages guaranteed as measured with 100Ω resistive load.

15.5AC Specifications

This section details the various AC timing specifications of the LAN9312.

Note: The I2C timing adheres to the Philips I2C-Bus Specification. Refer to the Philips I2C-Bus Specification for detailed I2C timing information.

15.5.1Equivalent Test Load

Output timing specifications assume the 25pF equivalent test load illustrated in Figure 15.1 below.

OUTPUT

25 pF

Figure 15.1 Output Equivalent Test Load

SMSC LAN9312

443

Revision 1.4 (08-19-08)

 

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