Datasheet
SN75C185
LOW-POWER MULTIPLE DRIVERS AND RECEIVERS
SLLS065F – AUGUST 1989 – REVISED JANUARY 2000
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over operating free-air temperature range, V
DD
= 12 V, V
SS
= –12 V,
V
CC
= 5 V ±10% (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
IT+
Positive-going input threshhold
voltage
See Figure 5 1.6 2.1 2.55 V
V
IT–
Negative-going input threshhold
voltage
See Figure 5 0.65 1 1.25 V
V
hys
Input hysteresis voltage
(V
IT+
– V
IT–
)
600 1100 mV
V
I
= 0.75 V, I
OH
= –20 µA, See Figure 5 and Note 8 3.5
V
OH
High level out
p
ut voltage
V
I
=
0.75 V,
V
CC
= 4.5 V 2.8 4.4
V
V
OH
High
-
le
v
el
o
u
tp
u
t
v
oltage
V
I
=
0
.
75
V
,
I
OH
= –1 mA,
V
CC
= 5 V 3.8 4.9
V
See Figure 5
V
CC
= 5.5 V 4.3 5.4
V
OL
Low-level output voltage V
I
= 3 V, I
OL
= 3.2 mA, See Figure 5 0.17 0.4 V
I
IH
High level in
p
ut current
V
I
= 3 V 0.43 0.55 1
mA
I
IH
High
-
le
v
el
inp
u
t
c
u
rrent
V
I
= 25 V 3.6 4.6 8.3
mA
I
IL
Low level in
p
ut current
V
I
= –3 V –0.43 –0.55 –1
mA
I
IL
Lo
w-
le
v
el
inp
u
t
c
u
rrent
V
I
= –25 V –3.6 –5.0 –8.3
mA
I
OS(H)
Short-circuit output at high level V
I
= 0.75 V, V
O
= 0, See Figure 4 –8 –15 mA
I
OS(L)
Short-circuit output at low level V
I
= V
CC
, V
O
= V
CC
, See Figure 4 13 25 mA
†
All typical values are at T
A
= 25°C.
NOTE 8: If the inputs are left unconnected, the receiver interprets this as an input low, and the receiver outputs remain in the high state.
switching characteristics, V
DD
= 12 V, V
SS
= –12 V, V
CC
= 5 V ±10%, T
A
= 25°C (unless otherwise
noted) (see Figure 6)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
Propagation delay time, low- to high-level output 3 4 µs
t
PHL
Propagation delay time, high- to low-level output
R
L
=5kΩ
C
L
=50
p
F
3 4 µs
t
TLH
Transition time, low- to high-level output
R
L
=
5
kΩ
,
C
L
=
50
pF
300 450 ns
t
THL
Transition time, high- to low-level output 100 300 ns
t
w(N)
Duration of longest pulse rejected as noise
(see Note 9)
R
L
= 5 kΩ, C
L
= 50 pF 1 4 µs
NOTE 9: The receiver ignores any postive- or negative-going pulse that is less than the minimum value of t
w(N)
and accepts any positive- or
negative-going pulse greater than the maximum of t
w(N)
.