DP83905AVQB datasheet(79/80 Pages) NSC

79 / 80 page

90 AC Timing Test Conditions

Input Pulse Levels (TTLCMOS)

GND to 30V

Input Rise and Fall Times (TTLCMOS)

5 ns

Input and Output Reference Levels

13V

(TTLCMOS)

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)

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

Output Load

(See Figure Below)

TLF11498 – 61

Note 1

Load Capacitance used depends on output type (includes scope

and jig capacitance)

For 3SL MOS TPI AUI CL e 50 pF

For 3SH OCH CL e 240 pF

Note 2

Specifications which measure delays from an active state to a high

impedance state are not guaranteed by production test but are character-

ized using 70 pF and are correlated to determine true driver turn-off time by

eliminating inherent R-C delay times in measurements

Note 3

S1 e Open for timing test 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

GND for High Impedance to active high and

active high to High Impedance measurements

Note 4

Pull-up load for CHRDY e 1kX

IO16 e 300X

M16 e 300X

Pin Capacitance TA e 25 C f e 1 MHz

Symbol

Parameter

Typ

Units

CIN

Input Capacitance

COUT

Output Capacitance

DERATING FACTOR

Output timing is measured with a purely capacitive load of

50 pF or 240 pF The following correction factor can be

used for other loads (Note This factor is preliminary)

Derating for 3SL MOS e E005 nspF

Derating for 3SH OCL TPI e E003 nspF

AUI Transmit Test Load

TLF11498 – 62

Note

In the above diagram the TXa and TXb signals are taken from the

AUI side of the isolation (pulse transformer) The pulse transformer used for

all testing is a 100 mH g01% Pulse Engineering PE64103

DP83905AVQB Datasheet(PDF) 79 Page - National Semiconductor (TI)

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