TNETX4080GGP datasheet(59/64 Pages) TI1

59 / 64 page

TNETX4080

ThunderSWITCH II™ 8-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS050A – AUGUST 1998 – REVISED NOVEMBER 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

The following load circuits and voltage waveforms show the conditions used for measuring switching characteristics.

Test points are illustrated schematically on the load circuits. Reference points are plotted on the voltage waveforms.

IV110

From Output

Under Test

Drive

Dependent

Internal and Input

Macro Load Circuit

From Output

Under Test

(four load values)

Output

Macro Load Circuit

tPLH/tPHL, tPZH/tPZL

N channel – tPZH only

P channel – tPZL only

Figure 20. Loading for Active Transitions

High or Low

+ Ion

Input

tPHZ/tPLZ

N channel – tPLZ only

P channel – tPHZ only

Figure 21. Loading for High-Impedance Transitions

10%

90%

10%

1.3 V

VDD

Input

47%

tPLH

VOH

VOL

Internal

In-Phase

Output

tPHL

47%

Figure 22. TTL Input Macro Propagation-Delay-Time Voltage Waveforms

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