AM79C874VC datasheet(42/60 Pages) AMD

42 / 60 page

Am79C874

P R E L I M INARY

DC CHARACTERISTICS (CONTINUED)

Notes:

1. Applies to TEST1/ FXR+, TEST0/FXR-, and SDI+ inputs only. Valid only when in PECL mode.

2. Applies to RX

inputs when in MLT-3 mode only. The RX input is guaranteed to assert internal signal detect for any valid

peak-to-peak input signal greater than VSDA MIN.

3. Applies to RX

inputs when in MLT-3 mode only. The RX input is guaranteed to de-assert internal signal for any peak to peak

signal less than VSDD MAX.

4. Applies to FXT+ and FXT- outputs only. Valid only when in PECL mode.

5. Applies to TX

differential outputs only. Valid only when in the MLT-3 mode.

6. VTXR is the ratio of the magnitude of TX in the positive direction to the magnitude of TX in the negative direction.

7. Only valid for TX output when in the 10BASE-T mode.

8. An IOLL value applies to LED pins.

9. Applies to all output pins on the MII port.

10. IOZ applies to all high-impedance output pins and all bi-directional pins. For COL and CRS parameters, IOZH limits are up to

mA, and IOZL up to –500 mA.

11. 75% activity means 25% IPG and 75% data. 100% activity means minimum IPG.

12. Applies to digital inputs and all bidirectional pins. These pins may have internal pull-up or pull-down resistors. RX

limits up

to 1.0 mA max for IIL and –1.0 mA for IIH. XTL limits up to 6.0 mA for IIL and –6.0 mA for IIH. External pull-up/pull-down

resistors affect this value.

13. Parameter not measured.

Symbol

Parameter Description

Test Conditions

Minimum

Maximum

Units

VTSQ

10BASE-T Squelch

Threshold

Sinusoid 5 MHz<f<10 MHz

300

585

VTHS

Post-Squelch Differential

Threshold 10BASE-T

Sinusoid 5 MHz<f<10 MHz

150

293

VRXDTH

10BASE-T RX

Differential

Switching Threshold

Sinusoid 5 MHz<f<10 MHz

-60

VTX10NE

10BASE-T Near-End Peak

Differential Voltage

(Note 7)

MLT-3/10BASE-T Test Load

2.2

2.8

IOZ

Output Leakage Current

(Note 10)

0.4 V < VOUT < VDD

-30

CIN

Input Capacitance XTL

(Note 13)

3pF

ICC

Power Supply Current

10BASE-T, idle

10BASE-T, normal activity

10BASE-T, peak

100BASE-TX

100BASE-TX, no cable

Power down

105

130

100

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