Datasheet

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SLLS173F − JANUARY 1994 − REVISED APRIL 2006
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
IK
Input clamp voltage I
I
= −18 mA −1.5 V
R
L
= 54 Ω,
See Figure 1
SN65LBC179,
SN65LBC179Q
1.1 2.2 5
|V
OD
|
Differential output voltage (see Note 3)
L
See Figure 1
SN75LBC179 1.5 2.2 5
V
|V
OD
| Differential output voltage (see Note 3)
R
L
= 60 Ω,
See Figure 2
SN65LBC179,
SN65LBC179Q
1.1 2.2 5
V
L
See Figure 2
SN75LBC179 1.5 2.2 5
∆|V
OD
|
Change in magnitude of differential output voltage
(see Note 4)
See Figures 1 and 2 ±0.2 V
V
OC
Common-mode output voltage 1 2.5 3 V
∆|V
OC
|
Change in magnitude of common-mode output
voltage (see Note 4)
R
L
= 54 Ω, See Figure 1
±0.2 V
I
O
Output current with power off V
CC
= 0, V
O
= −7 V to 12 V ±100 µA
I
IH
High-level input current V
I
= 2.4 V −100 µA
I
IL
Low-level input current V
I
= 0.4 V −100 µA
I
OS
Short-circuit output current −7 V ≤ V
O
≤ 12 V ±250 mA
I
CC
Supply current
No load
SN65LBC179,
SN75LBC179
4.2 5 mA
I
CC
Supply current
No load
SN65LBC179Q 4.2 7 mA
†
All typical values are at V
CC
= 5 V and T
A
= 25°C.
NOTES: 3. The minimum V
OD
specification of the SN65179 may not fully comply with ANSI RS-485 at operating temperatures below 0°C.
System designers should take the possibly lower output signal into account in determining the maximum signal transmission
distance.
4. ∆|V
OD
| and ∆|V
OC
| are the changes in the steady-state magnitude of V
OD
and V
OC
, respectively, that occur when the input is
changed from a high level to a low level.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
d(OD)
Differential-output delay time
R
L
= 54 Ω
See Figure 3
7 18 ns
t
t(OD)
Differential transition time
R
L
= 54
Ω,
See Figure 3
5 20 ns