Datasheet

Test circuits and typical characteristics
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
12/24
DocID9102 Rev 11
Figure 8: Drive enable and disable times waveforms (pull-down configuration)
1. t
PZH
is valid if the driver is initially disabled ( RE is high), t
PSH
is valid if the driver is
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. C
L
includes probe and stray capacitance
IN
OUT
t
PZH
or t
PSH
(1)
1.5 V 1.5 V
V
OM
t
PHZ
3 V
0 V
V
OH
0.25 V
0 V
IN
(1)
V
CC
D
S1
V
OM
= (V
OH
= V
OL
)/2 = 1.5 V
R
L
= 27 Ω
OUT
C
L
= 15 pF
(2)