TNETX3150 datasheet(84/113 Pages) TI1

84 / 113 page

TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage range, VCC (see Notes 1 and 2)

–0.5 V to 4 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply voltage range, VCC (5V) (see Notes 1 and 2)

–0.5 V to 5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI

–0.5 V to VCC(5 V) + 0.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, VO

–0.5 V to VCC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermal impedance, junction-to-ambient package, airflow = 0, ZθJA

11.11

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . .

Thermal impedance, junction-to-ambient package, airflow = 100 ft/min, ZθJA

9.61

°C/W

. . . . . . . . . . . . . . . . .

Thermal impedance, junction-to-case package, ZθJC

0.94

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating case temperature range, TC

°C to 95°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, Tstg

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” can cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods can affect device reliability.

NOTES:

1. All voltage values are with respect to GND.

2. Turning power supplies on and off (cycling sequence) within a mixed 5-V/3.3-V system is an important consideration. The designer

must observe a few rules to avoid damaging the TNETX3150/TNETX3150A. Check with the manufacturers of all components used

in the 3.3-V to 5-V interface to ensure that no unique device characteristics exist that would lead to rules more restrictive than the

TNETX3150/TNETX3150A requires.

The optimum solution to power-supply sequencing in a mixed-voltage system is to ramp up the 3.3-V supply first. A power-on reset

component operating from this supply forces all 5-V tolerant outputs into the high-impedance state. Then, the 5-V supply is ramped

up. On power down, the 5-V rail deenergizes first, followed by the 3.3-V rail.

The second-best solution is to ramp both the 3.3-V and 5-V rails at the same time, making sure that no more than 3.6 V exists between

these two rails during the ramp up or down. If the 3.3 V is derived from the 5 V, then the 3.3 V rises as the 5 V rises so that the 5-V

rail never exceeds the 3.3-V rail by more than 3.6 V. Both the optimum and second-choice algorithms for power up prevent device

damage. If it is impractical to implement ramping, follow these rules:

• When turning on the power supply, all 3.3-V and 5-V supplies should start ramping from 0 V and reach

95 percent of their end-point values within 25 ms. All bus contention between the device and external

devices is eliminated by the end of 25 ms.

• Whenturning off the power supply, 3.5-V and 5-V supplies should start ramping from steady-state values

and reach 5 percent of these values within 25 ms. All bus contention between the device and external

devices is eliminated by the end of 25 ms. There is a 250-second lifetime maximum at greater than 3.6 V

between the supply rails. Holding this period to 25 ms per power-on/off cycle should not significantly

contribute to mean time between failure (MTBF) shifts during product lifetimes.

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