ICS1892 datasheet(122/148 Pages) ICST

122 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

122

Chapter 10

DC and AC Operating Conditions

ICS1892 Data Sheet

10.4

DC Operating Characteristics

This section lists the DC operating characteristics for the ICS1892.

10.4.1

DC Operating Characteristics for Supply Current

Table 10-4 lists the DC operating characteristics for the supply current to the ICS1892.

Note:

All VDD measurements are taken with respect to VSS (which equals 0 V).

† These supply current parameters are measured through VDD pins to the ICS1892. The supply current

parameters exclude external transformer currents.

10.4.2

DC Operating Characteristics for TTL Inputs and Outputs

Table 10-5 lists the DC operating characteristics of the ICS1892 TTL inputs and outputs.

Note:

All VDD measurements are taken with respect to VSS (which equals 0 V).

10.4.3

DC Operating Characteristics for REF_IN

Table 10-6 lists the DC characteristics for the REF_IN pin.

Note:

The REF_IN input switch point is 50% of VDD.

Table 10-4.

DC Operating Characteristics for Supply Current

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Supply Current†

IDD

100Base-TX Mode

VDD = 5.25 V

–

162

180

Supply Current†

IDD

10Base-T Mode

VDD = 5.25 V

–

133

147

Supply Current†

IDD

Auto-Negotiation Mode

VDD = 5.25 V

–

162

180

Supply Current†

IDD

Power-Down Mode

VDD = 5.25 V

–

Supply Current†

IDD

Reset

VDD = 5.25 V

–

Table 10-5.

DC Operating Characteristics for TTL Inputs and Outputs

Parameter

Symbol

Conditions

Min.

Max.

Units

TTL Input High Voltage

VIH

VDD = 5.25 V

–

2.0

–

TTL Input Low Voltage

VIL

VDD = 5.25 V

–

0.8

TTL Output High Voltage

VOH

VDD = 4.75 V

IOH = –4 mA

2.4

–

TTL Output Low Voltage

VOL

VDD = 4.75 V

IOL = +4 mA

–

0.4

TTL Driving CMOS,

Output High Voltage

VOH

VDD = 4.75 V

IOH = –4 mA

3.68

–

TTL Driving CMOS,

Output Low Voltage

VOL

VDD = 4.75 V

IOL = +4 mA

–

0.4

Table 10-6.

DC Operating Characteristics for REF_IN

Parameter

Symbol

Test Conditions

Min.

Max.

Units

Input High Voltage

VIH

VDD = 5.25 V

VSS = 0 V

3.5

–

Input Low Voltage

VIL

VDD = 5.25 V

VSS = 0 V

–

1.5

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