AM79C98 datasheet(15/22 Pages) AMD

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AMD

Am79C98

DC CHARACTERISTICS (continued)

Parameter

Symbol

Parameter Description

Test Conditions

Min

Max

Unit

Twisted Pair Interface

IIRXD

Input Current at RXD+/–

AVSS < VIN < AVDD

–500

500

µA

RRXD

RXD+/– Differential Input

(Note 1)

Ω

Resistance

VTIVB

RXD+, RXD– Open Circuit Input

IIN = 0 mA

AVDD - 3.0

AVDD - 1.5

Voltage (Bias)

VTIDV

Differential Mode Input

AVDD = +5 V

–3.1

3.1

Voltage Range (RXD+/–)

VTSQ+

RXD Positive

Sinusoid 5 MHz < f< 10 MHz

300

520

Squelch Threshold (Peak)

VTSQ–

RXD Negative

Sinusoid 5 MHz < f< 10 MHz

–520

–300

Squelch Threshold (Peak)

VTHS+

RXD Post-Squelch Positive

Sinusoid 5 MHz < f< 10 MHz

150

293

Threshold (Peak)

VTHS–

RXD Post-Squelch Negative

Sinusoid 5 MHz < f< 10 MHz

–293

–150

Threshold (Peak)

VRXDTH

RXD Switching Threshold

(Note 1)

–60

VTXH

TXD+/– and TXP+/–

(Note 2)

DVDD - 0.6

DVDD

Output HIGH Voltage

DVSS = 0 V

VTXL

TXD+/– and TXP+/–

(Note 2)

DVSS

DVSS + 0.6

Output LOW Voltage

DVDD = +5 V

VTXI

TXD+/– and TXP+/–

–40

+40

Differential Output

Voltage Imbalance

VTXOFF

TXD+/– and TXP+/–

DVDD = +5 V

–40

+40

Differential Idle Output Voltage

RTX

TXD+/– and TXP+/–

(Note 1)

Ω

Differential Driver

Output Impedance

IIREXT

Input Current at REXT Pin

REXT = 24.3K

Ω ± 1%

120

µA

AVDD = +5 V

Power Supply Current

IDD

Power Supply Current

PRDN/RST = HIGH

115

(Transmitting 10 MHz Data)

(Typical TP load)

Power Supply Current

PRDN/RST = HIGH

(Transmitting 10 MHz Data)

(No TP load)

IDDPRDN

Power Supply Current

PRDN/RST = LOW

in Power Down Mode

AM79C98 Datasheet(PDF) 15 Page - Advanced Micro Devices

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