LXT970ATC datasheet(48/74 Pages) INTEL

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LXT970A — Dual-Speed Fast Ethernet Transceiver

Datasheet

Table 23. Digital I/O Characteristics1

Parameter

Symbol

Min

Typ

Max

Units

Test Conditions

Input Low Voltage3

VIL

––

Input High Voltage3

VIH

2.0

––

Input Current

-10

–

µA0.0 < VI < VCC

Output Low Voltage

VOL

––

0.4

IOL = 4 mA

Output High Voltage (MII only)

VOH

2.2

––

VIOH = -4 mA, VCCIO =3.3V

Output High Voltage

VOH

2.4

––

VIOH = -4 mA, VCCIO =5.0V

MII Driver Output Resistance

(Line Driver Output Enabled)

RO2,4

6.0

–

25.0

Ω

VCCIO = 3.3V

RO2,4

6.0

–

25.0

Ω

VCCIO = 5.0V

1. Applies to all pins except MF<4:0> pins. Refer to Table 24 for MF pin I/O Characteristics.

2. Parameter is guaranteed by design and not subject to production testing.

3. Does not apply to XI or TX_CLK pins. Refer to Table 25 for clock input levels.

4. Applies to default MII driver level (bit 17.3= 0).

Table 24. Digital I/O Characteristics - MultiFunction Pins MF<4:0>

Parameter

Symbol

Min

Typ

Max

Units

Test Conditions

Input Voltage Level 1

VMF1VCC - 0.5

––

Input Voltage Level 2

VMF2(VCC/2) + 0.5

–

VCC - 1.2

Input Voltage Level 3

VMF31.2

–

VCC/2 - 0.5

Input Voltage Level 4

VMF4

––

0.5

1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

Table 25. Required Clock Characteristics

Parameter

Sym

Min

Typ

Max

Units

Test Conditions

Master Clock Mode - External XI Clock Input

Input Low Voltage2

VIL

––

1.0

Input High Voltage2

VIH

3.2

––

Input Clock Frequency Tolerance2

∆f

––

± 100

ppm

Clock frequency is 25

MHz or 2.5 MHz

Input Clock Duty Cycle2

Tdc

–

Input Capacitance (XI and XO)

CIN

–

3.0

–

Slave Clock Mode - External TX_CLK Input

Input Low Voltage

VIL

––

Input High Voltage

VIH

2.0

––

Input Clock Frequency Tolerance2

∆f

––

± 100

ppm

Clock frequency is 25

MHz or 2.5 MHz

Input Clock Duty Cycle2

Tdc

–

1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

2. Parameter is guaranteed by design; not subject to production testing.

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