Datasheet

SN75LBC187
MULTICHANNEL EIA-232 DRIVER/RECEIVER
WITH CHARGE PUMP
SLLS130C – SEPTEMBER 1991 – REVISED MAY 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating conditions, T
A
= 25°C (unless otherwise
noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
PLH
Pro
p
agation delay time low to high level out
p
ut
Receiver
R
L
= 5 kΩ,
See Figure 1
C
L
= 50 pF,
1.25 µs
t
PLH
Propagation
dela
y
time
,
lo
w-
to
high
-
le
v
el
o
u
tp
u
t
Driver
R
L
= 3 kΩ,
See Figure 2
C
L
= 1200 pF,
1.25 µs
t
PHL
Pro
p
agation delay time high to low level out
p
ut
Receiver
R
L
= 5 kΩ,
See Figure 1
C
L
= 50 pF,
1.25 µs
t
PHL
Propagation
dela
y
time
,
high
-
to
lo
w-
le
v
el
o
u
tp
u
t
Driver
R
L
= 3 kΩ,
See Figure 2
C
L
= 1200 pF,
1.25 µs
t
Rise time driver out
p
ut
R
L
= 3 kΩ,
V
O
= –3 V to 3 V,
C
L
= 50 pF,
See Note 2
200 ns
t
r
Rise
time
,
dri
v
er
o
u
tp
u
t
R
L
= 3 kΩ,
V
O
= –3.3 V to 3.3 V,
C
L
= 2500 pF,
See Note 3
1.5 µs
t
f
Fall time driver out
p
ut
R
L
= 3 kΩ,
V
O
= 3 V to –3 V
C
L
= 50 pF,
200 ns
t
f
Fall
time
,
dri
v
er
o
u
tp
u
t
R
L
= 3 kΩ, C
L
= 2500 pF,
15
µs
L
V
O
= 3.3 V to –3.3 V
L
1
.
5
µ
s
NOTES: 2. The 200 ns for the output to change from –3 V to 3 V (or vice versa) corresponds to the 30 V/µs maximum slew rate of EIA/TIA-232-E,
EIA/TIA-562, and ITU Recommendation V.28.
3. The more stringent requirement for transition times comes from the EIA/TIA-562, which requires the rise and fall times to be
measured from 3.3 V.