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T8302

Internet Protocol Telephone Advanced RISC Machine (ARM®) Ethernet QoS Using IEEE® 802.1q

Agere -> LSI Corporation 

Data Sheet

July 2001

T8302 Internet Protocol Telephone

Advanced RISC Machine (ARM )

19 Electrical Specifications (continued)

19.4 PHY Clock Crystal

The T8302 requires a 25 MHz clock source (derived from an oscillator or a crystal) for PHY timing. If a crystal s

used, it must be connected between XLO and XHI. The crystal specifications are shown below.

Table 212. PHY Clock (XLO, XHI) Crystal Specifications

Parameter

Frequency.

Oscillation Mode.

Effective Series Resistance.

Load Capacitance.

Shunt Capacitance.

Frequency Tolerance and Stability.

Value

25 MHz

Fundamental, parallel resonance

A discussion of crystal selection for the T8302 may be found

in the application note Crystal Selection for the T8301/T8302

Chip Set.

±50 ppm

19.5 Real-Time Clock Crystal

The T8302 may use an optional a 32.768 KHz clock source (derived from an oscillator or a crystal) for real-time

clock timing. This crystal is only required if the internal RTC clock does not provide sufficient accuracy. If a crystal

is used, it must be connected between XRTC0 and XRTC1. The crystal specifications are shown below.

Table 213. Real-Time Clock (XRTC0, XRTC1) Specifications

Parameter

Frequency.

Oscillation Mode.

Effective Series Resistance.

Load Capacitance.

Shunt Capacitance.

Frequency Tolerance and Stability.

Value

32.768 KHz

Fundamental, parallel resonance

A discussion of crystal selection for the T8302 may be found

in the application note Crystal Selection for the T8301/T8302

Chip Set.

±20 ppm

Table 214. Reset Pulse

Parameter

RESET# Minimum Pulse Width.

Min

Max

Unit

200

—

ns

19.6 dc Electrical Characteristics

VDD = 3.3 V and Vss = 0.0 V unless otherwise specified.

Table 215. dc Electrical Characteristics

Parameter

Supply Current.

Supply Voltage (3.3 V ± 5%).

Input High-Voltage.

Input Low-Voltage.

Input Current.

Symbol

IDD

VDD

VIH

VIL

II

Agere Systems Inc.

Condition

—

—

—

—

VA = 2.0 V

Min Typ

—

—

3.135 —

2.0

—

—

—

—

—

Max

600

3.465

—

0.8

20

Unit

mA

V

V

V

µA

243

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