TNETX15VE datasheet(92/113 Pages) TI1

92 / 113 page

TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 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 2 and 3)

–0.5 V to 4 V

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

Supply voltage range, VCC (5V) (see Notes 2 and 3)

–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

47.5

°C/W

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

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

38.2

°C/W

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

Thermal impedance, junction-to-case package, ZθJC

9.9

°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:

3. All voltage values are with respect to GND.

4. 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 TNETX15VE. 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 TNETX15VE

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 any 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.

–

When turning 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 failures (MTBF) shifts during product lifetimes.

recommended operating conditions

MIN

NOM

MAX

UNIT

VCC

Supply voltage

3.3

3.6

VCC(5V)

Supply voltage

4.5

5.5

VIH

High-level input voltage

VCC(5V)

VIL

Low-level input voltage (see Note 5)

0.8

IOH

High-level output current

-4

IOL

Low-level output current

NOTE 5: The algebraic convention, where the more negative (less positive) limit is designated as a minimum, is used for logic-voltage levels only.

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