DP83901AV datasheet(61/62 Pages) NSC

61 / 62 page

150 Switching Characteristics AC Specs DP83901A Note All Timing is Preliminary (Continued)

Transmit Timing (End of Packet)

TLF10469 – 47

TRANSMIT SPECIFICATIONS

(End of Packet)

Symbol

Parameter

Min

Max

Units

tTOH

Transmit Output High before Idle (Half Step)

200

tTOI

Transmit Output Idle Time to g40 mV(Half Step)

8000

Reset Timing

TLF10469 – 45

Symbol

Parameter

Min

Max

Units

rstw

Reset Pulse Width (Note 1)

BSCK Cycles or TXC Cycles (Note 2)

Note 1

The RESET pulse requires the BSCK and TXC be stable On power up RESET should not be raised until BSCK and TXC have become stable Several

registers are affected by RESET Consult the register descriptions for details

Note 2

The slower of BSCK or TXC clocks will determine the minimum time for the RESET signal to be low TXC is X1 divided by 2

If BSCK k TXC then RESET e 8 c BSCK

If TXC k BSCK then RESET e 8 c TXC

160 AC Timing Test Conditions

All specifications are valid only if the mandatory isolation is

employed and all differential signals are taken to be at the

AUI side of the pulse transformer

Input Pulse Levels (TTLCMOS)

GND to 30V

Input Rise and Fall Times (TTLCMOS)

5 ns

Input and Output Reference Levles (TTLCMOS)

13V

Input Pulse Levels (Diff)

350 mV to b1315 mV

Input and Output

50% Point of

Reference Levels (Diff)

the Differential

TRI-STATE Reference Levels

Float (DV) g05V

Output Load (See Figure Below)

TLF10469 – 48

Note 1

50 pF includes scope and jig capacitance

Note 2

S1 e Open for timing tests for push pull outputs

S1 e VCC for VOL test

S1 e GND for VOH test

S1 e VCC for High Impedance to active low and

active low to High Impedance measurements

S1 e GND for High Impedance to active high and

active high to High Impedance measurements

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