AM79C875KC datasheet(35/48 Pages) AMD

35 / 48 page

Am79C875

Power Supply Current Consumption

Symbol

Parameter

Description

Test Conditions

Minimum

Typical

Maximum

Units

IDD

Power Supply Current

for 10BASE-T

(Note 11)

VDD = maximum

260

(Note 13)

480

(Note 11,12)

IDD

Power Supply Current

for 100BASE-TX/FX

(Note 11)

VDD = maximum

300

380

(Note 11)

Notes:

1. Applies to FXR+, FXR-, SDI+, and SDI- inputs only. Valid only when Port 3 is in PECL mode. VDD is that of the fiber

transceiver.

2. Applies to RX± inputs when the corresponding port is 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 MAX. Tested within limits of VSDD and VSDA.

3. Applies to RX± inputs when the corresponding port is in MLT-3 mode only. The RX± input is guaranteed to de-assert internal

signal for any peak to peak signal less than VSDD MIN. Tested within limits of VSDD and VSDA.

4. Applies to FXT+ and FXT- outputs only. Valid only when Port 3 is in PECL mode. VDD is that of the fiber transceiver.

5. Applies to digital inputs and all bidirectional pins. RX± limits up to 1.0 mA max for IIL and -1.0 mA min for IIH. Pull-up/pull-down

resistors effect this value.

6. Applies to TX± differential outputs only. Valid only when the port is in the MLT-3 mode.

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

8. Parameter not tested.

9. Only valid for TX output when the port is in the 10BASE-T mode.

10. IOZ applies to all high-impedance output pins. Pull-up/pull-down resistors effect this value.

11. Tested with all TX± output pins driving the rated load.

12. Assumes 80% Utilization with all ports at 10 Mbps, using 1:1 transformers.

13. Typical is 30% network utilization.

14. Assumes outputs are loaded, and all LEDs are used.

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 (Note 8)

Sinusoid 5 MHz<f<10 MHz

150

293

VRXDTH

10BASE-T RX

± Differential

Switching Threshold (Note 8)

Sinusoid 5 MHz<f<10 MHz

-60

VTX10NE

10BASE-T Near-End Peak

Differential Voltage (Note 9)

MLT-3/10BASE-T Test Load

2.2

2.8

IOZ

Output Leakage Current

(Note 10)

0.4 V < VOUT < VDD

-30

100

µA

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