TNETA1585

ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE

WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES

SDNS041A – NOVEMBER 1996 – REVISED JULY 1998

20

POST OFFICE BOX 655303

electrical characteristics over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

TTL

IOH = 8 mA

VCC 06

VOH

High level output voltage

TTL

IOH = 4 mA

VCC – 0.6

V

VOH

High-level output voltage

5 V tolerant TTL

IOH = 8 mA

VCC 06

V

5-V tolerant TTL

IOH = 4 mA

VCC – 0.6

TTL

IOL = 8 mA

0.4

VOL

Low level output voltage

TTL

IOL = 4 mA

0.4

V

VOL

Low-level output voltage

5 V tolerant TTL

IOL = 8 mA

0.4

V

5-V tolerant TTL

IOL = 4 mA

0.4

IIH

High level input current

TTL

VI = VIH (max),

See Note 4

±1

µA

IIH

High-level input current

5-V tolerant TTL

VI = VIH (min)

–760

µA

IIL

Low-level input current

TTL

VI =VIL (min)

See Note 5

±1

µA

IIL

Low-level in ut current

5-V tolerant TTL

VI = VIL (min),

See Note 5

±1

µA

IOZ

High-impedance-state output current

TTL

±20

µA

IOZ

High-im edance-state out ut current

5-V tolerant TTL

±20

µA

NOTES:

4. These specifications apply only when the pulldown terminator is turned off.

5. These specifications apply only when the pullup terminator is turned off.

recommended power-supply sequencing for mixed-voltage devices

The recommended power-supply sequencing in a mixed-voltage system is as follows:

reach 95 percent of their end-point values within a 25-ms time window. All bus contention between the

TNETA1585 and external devices is eliminated by the end of the 25-ms time window. The preferred

order of supply ramping is to ramp the 3.3-V supply followed by the 5-V supply. This order is not

mandatory, but it allows a larger cumulative number of power-supply on events than the reverse order.

state values and reach 5 percent of these values within a 25-ms time window. All bus contention

between the TNETA1585 and external devices is eliminated by the end of the 25-ms time window. The

preferred order of supply ramping is to ramp down the 5-V supply followed by the 3.3-V supply. This

order is not mandatory, but it allows a larger cumulative number of power-supply off events than the

reverse order.

If these precautions and guidelines are not followed, the TNETA1585 device may experience failures.