AM79C985 datasheet(36/48 Pages) AMD

36 / 48 page

Am79C985

PRELIMINARY

DC CHARACTERISTICS (continued)

Notes:

1. Parameter not tested.

2. LED current not included. Maximum current rating on LED drivers is 12 mA.

Parameter

Symbol

Parameter Description

Test Conditions

Min

Max

Unit

Twisted Pair Ports (Continued)

VTSQ+

RXD Positive Squelch Threshold

(peak)

Sinusoid

5 MHz<f<10 MHz

300

520

VTSQ–

RXD Negative Squelch Threshold

(peak)

Sinusoid

5 MHz<f<10 MHz

–520

–300

VTHS+

RXD Post-Squelch Positive

Threshold (peak)

Sinusoid

5 MHz<f<10 MHz

150

293

VTHS–

RXD Post-Squelch Negative

Threshold (peak)

Sinusoid

5 MHz<f<10 MHz

–293

–150

VLTSQ+

RXD Positive Squelch Threshold

(peak) - Extended Distance Mode

Sinusoid

5 MHz<f<10 MHz

180

365

VLTSQ–

RXD Negative Squelch Threshold

(peak) - Extended Distance Mode

Sinusoid

5 MHz<f<10 MHz

–365

–180

VLTHS+

RXD Post-Squelch Positive

Threshold - Extended Distance Mode

Sinusoid

5 MHz<f<10 MHz

175

VLTHS–

RXD Post-Squelch Negative

Threshold - Extended Distance Mode

Sinusoid

5 MHz<f<10 MHz

–175

–90

VRXDTH

RXD Switching Threshold

(Note 1)

–60

Power Supply Current

IDD

Power Supply Current

(Idle) (Note 2)

CLK = 20 MHz

VDD = +5.25V

–

100

Power Supply Current

(Transmitting)

CLK = 20 MHz

VDD = +5.25V

–

350

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