Datasheet
ISO1176T
www.ti.com
SLLSE28F –OCTOBER 2010–REVISED OCTOBER 2012
RS-485 DRIVER SWITCHING CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
, t
PHL
Prop delay time 23 35
V
CC1
= 5V ± 10%,
ns
V
CC2
= 5V ± 5%
t
sk(p)
Pulse skew (|t
PHL
– t
PLH
|) 2 5
t
PLH
, t
PHL
Prop delay time 25 40
V
CC1
= 3.3V ± 10%,
See Figure 10 ns
V
CC2
= 5V ± 5%
t
sk(p)
Pulse skew (|t
PHL
– t
PLH
|) 2 5
t
r
Differential output signal rise time 2 3 7.5
ns
t
f
Differential output signal fall time 2 3 7.5
t
pDE
DE to ISODE prop delay See Figure 14 30 ns
t
t(MLH)
, t
t(MHL)
Output transition skew See Figure 11 1 ns
t
p(AZH)
, t
p(BZH)
,
Propagation delay, high-impedance-to-active output 80
See Figure 12 and
t
p(AZL)
, t
p(BZL)
Figure 13, ns
t
p(AHZ)
, t
p(BHZ)
,
C
L
= 50pf, RE at 0 V
Propagation delay, active-to-high-impedance output 80
t
p(ALZ)
, t
p(BLZ)
| t
p(AZL)
– t
p(BZH)
|
Enable skew time 0.55 1.5 ns
| t
p(AZH)
– t
p(BZL)
|
t
(CFB)
Time from application of short-circuit to current fold back See Figure 9 0.5 µs
t
(TSD)
Time from application of short-circuit to thermal shutdown See Figure 9, T
A
= 25°C 100 µs
RECEIVER ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IT(+)
Positive-going input threshold voltage I
O
= –8mA –80 -10
See Figure 16
V
IT(–)
Negative-going input threshold voltage I
O
= 8mA –200 –120 mV
V
hys
Hysteresis voltage (V
IT+
– V
IT–
) 25
I
OH
= -8mA V
CC1
– 0.4 3
V
ID
= 200 mV, See
V
OH
High-level output voltage V
V
CC1
= 3.3V ±
Figure 16
I
OH
= -20µA V
CC1
– 0.1 3.3
10% and V
CC2
=
I
OL
= 8mA 0.2 0.4
V
ID
= -200 mV, See
5V ± 5%
V
OL
Low-level output voltage V
Figure 16
I
OL
= 20µA 0 0.1
I
OH
= –8mA V
CC1
– 0.8 4.6
V
ID
= 200 mV, See
V
OH
High-level output voltage V
Figure 16
I
OH
= –20µA V
CC1
– 0.1 5
V
CC1
= 5V ±
10% and V
CC2
=
V
ID
= –200 mV,
I
OL
= 8mA 0.2 0.4
5V ± 5%
See Figure 16
V
OL
Low-level output voltage V
I
OL
= 20µA 0 0.1
V
CC2
= 4.75V
I
A
, I
B
or 5.25V
V
I
= –7 or 12V,
Bus pin input current –160 200 µA
Other input = 0 V
I
A(off)
,
V
CC2
= 0V
I
B(off)
I
I
Receiver enable input current RE = 0 V –50 50 µA
I
OZ
High-impedance state output current RE = V
CC1
–1 1 µA
R
ID
Differential input resistance A, B 60 kΩ
Test input signal is a 1MHz sine
C
ID
Differential input capacitance wave with 1Vpp amplitude. CD is 7 10 pF
measured across A and B.
CMR Common mode rejection See Figure 19 4 V
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