82541(PI/GI/EI) — Networking Silicon

20

4.2.2

Voltage Ramp and Sequencing Recommendations

Note:

In any case or time period (greater than 1 ns), the supply voltage should comply with 3.3 V > 1.8 V

> 1.2V. This is important to avoid stress in the ESD protection circuits. After 3.3 V reaches 10% of

its final value, all voltage rails (1.8 V and 1.2 V) have 150 ms to reach their final operating values.

tr/tf

input rise/fall time (Schmitt input)

0

10

ms

Operating temperature range

(ambient)

070

°C

Junction temperature

≤125

°C

a. Sustained operation of the device at conditions exceeding these values, even if they are within the absolute maximum rating

limits, might result in permanent damage.

b. The value listed in this table is for external voltage regulation. If the internal voltage regulator is used, the minimum value is

1.67 V.

c.

The value listed in this table is for external voltage regulation. If the internal voltage regulator is used, the maximum value is

1.926 V.

d. The value listed in this table is for external voltage regulation. If the internal voltage regulator is used, the minimum value is

1.12 V.

e. The value listed in this table is for external voltage regulation. If the internal voltage regulator is used, the maximum value is

1.284 V.

Table 3.

3.3V Supply Voltage Ramp

Parameter

Description

Min

Max

Unit

Rise Time

Time from 10% to 90% mark

0.1

100

ms

Monotonicity

Voltage dip allowed in ramp

0

mV

Slope

Ramp rate at any time between 10% to 90%

28800

V/s

Operational

Range

Voltage range for normal operating conditions

3

3.6

V

Ripple

Maximum voltage ripple at a bandwidth equal

to 50 MHz

70

mV

Overshoot

Maximum voltage allowed

4

V

Table 4.

1.8V Supply Voltage Ramp

Symbol

Parameter

Min

Max

Unit

Rise Time

Time from 10% to 90% mark

0.1

100

ms

Monotonicity

Voltage dip allowed in ramp

0

mV

Slope

Ramp rate at any time between 10% to 90%

57600

V/s

Operational

Range

Voltage range for normal operating conditions

1.71

1.89

V

Ripple

Maximum voltage ripple at frequency below

1 MHz

280

Ripple

Minimum voltage ripple at frequency below

1 MHz

1.55

V

Overshoot

Maximum voltage allowed

2.2

V

Table 2.

Symbol

Parameter

Min

Max

Unit