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TNETA1585PCM Datasheet(PDF) 20 Page - Texas Instruments

Part No. TNETA1585PCM
Description  ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TNETA1585PCM Datasheet(HTML) 20 Page - Texas Instruments

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TNETA1585
ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE
WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES
SDNS041A – NOVEMBER 1996 – REVISED JULY 1998
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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:
When the power supply is being turned on, all 3.3-V and 5-V supplies should start ramping from 0 V and
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.
When the power supply is being turned off, all 3.3-V and 5-V supplies should start ramping from steady
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.


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