Test circuits and typical characteristics

ST3485EB, ST3485EC, ST3485EI, ST3485EIY

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DocID9102 Rev 11

Figure 8: Drive enable and disable times waveforms (pull-down configuration)

1.

initially in shutdown mode (RE is low).

Figure 9: Drive propagation time test circuit

1.

The input pulse is supplied by a generator with the following characteristics: PRR =

250 kHz, 50 % duty cycle, tr ≤ 6.0 ns.

2.

IN

OUT

tPZH or tPSH

(1)

1.5 V

1.5 V

VOM

tPHZ

3 V

0 V

VOH

0.25 V

0 V

IN

(1)

VCC

D

S1

VOM = (VOH = VOL)/2 = 1.5 V

RL = 27 Ω

OUT

CL = 15 pF

(2)