Si3452/3

Rev. 1.0

5

Table 2. Recommended Operating Conditions

Description

Symbol

Test Conditions

Min

Typ

Max

Unit

Ambient operating tem-

perature

“–GM” part numbers

–10

—

85

°C

“–IM” part numbers

–40

—

85

Thermal impedance*

θ

JA

No airflow

—

32

—

°C/W

1 m/s airflow

—

28

—

Power Supply Voltages

For IEEE 802.3af (15.4 W) apps.

–57

–48

–45

V

For IEEE 802.3at (30 W) apps.

–57

–54

–51

3.0

3.3

3.6

V

Power Supply Currents

All ports on, excluding load current.

—

3.7

6.0

mA

All ports in shutdown mode

—

1

2

—8

14

mA

*Note: Modeled with six parts evenly spaced on a 30 x 120 mm2, four-layer board with 25 thermal vias to a Vneg plane on the

back.

Table 3. UVLO, and Reset Specifications

Description

Symbol

Test Conditions

Min

Typ

Max

Unit

—2.2

—

V

*

Ramp from 0 V to 3.0 V

—

—

1

ms

RST input high voltage

——

V

RST input low voltage

—

—

0.8

V

RST input leakage

RST =0V

—

—

40

μA

Reset time delay

Time between end of reset and begin-

ning of normal operation

——

100

ms

Reset assertion time

RST low time to generate system

reset

15

—

—

μs

–4

—

4

%

Point at which VEE UVLO is

declared.

VEE going negative

VEE going positive

–38

—

–36

–33

—

–31

V

*Note: If VDD ramp time is slower than 1 ms, hold the reset pins low until VDD is above 3.0 V to insure proper reset

operation.