lms485 National Semiconductor Corporation, lms485 Datasheet - Page 5

• Manufacturer Part Number: lms485
• Description: 5v Low Power Rs-485 / Rs-422 Differential Bus
• Manufacturer: National Semiconductor Corporation

V
V
I
R
Power Supply Current
I
I
I
I
Switching Characteristics
Driver
T
T
T
T
T
T
T
T
T
Receiver
T
T
T
T
T
F
OZR
CC
OSD1
OSD2
OSR
Symbol
PLH
PHL
SKEW
R
F
ZH
ZL
HZ
LZ
PLH
PHL
SKEW
ZH
ZL
MAX
OH
OL
Electrical Characteristics
IN
Over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics
Note 2: All voltage values, except differential I/O bus voltage, are with respect to network ground terminal.
Note 3: The maximum power dissipation is a function of T
(T
Note 4: ESD rating based upon human body model, 100pF discharged through 1.5kΩ.
Note 5: Voltage limits apply to DI, DE, RE pins.
Note 6: Differential input/output bus voltage is measured at the non-inverting terminal A with respect to the inverting terminal B.
Note 7: |∆V
Note 8: Peak current
,
,
,
,
J(MAX)
,
,
- T
A
OD
CMOS High-level Output
Voltage
CMOS Low-level
Tristate Output Leakage
Current
Input Resistance
Supply Current
Driver Short-circuit Output
Current
Driver Short-circuit Output
Current
Receiver Short-circuit Output
Current
Propagation Delay Input to
Output
Driver Output Skew
Driver Rise and Fall Time
Driver Enable to Ouput Valid
Time
Driver Output Disable Time
Propagation Delay Input to
Output
Receiver Output Skew
Receiver Enable Time
Receiver Disable Time
Maximum Data Rate
)/θ
| and |∆V
JA
. All numbers apply for packages soldered directly into a PC board.
OC
Parameter
| are changes in magnitude of V
I
I
0.4V ≤ V
− 7V ≤ V
DE = V
DE = 0V, RE = GND or V
V
(Note 8)
V
(Note 8)
0 V ≤V
R
(Figure 3, Figure 7)
R
(Figure 3, Figure 7)
R
(Figure 3, Figure 7)
C
(Figure 4, Figure 8)
C
(Figure 4, Figure 8)
R
(Figure 5, Figure 7)
R
(Figure 5, Figure 7)
C
(Figure 6, Figure 10)
OH
OL
O
O
L
L
L
L
L
L
L
L
(Continued)
= 54Ω, C
= 54Ω, C
= 54Ω, C
= 100 pF, R
= 15 pF, R
= 54Ω, C
= 54Ω, C
= 15 pF, R
= 4mA, V
= high, −7V ≤ V
= low, − 7V ≤V
= −4mA, V
OD
J(MAX)
O
and V
CC,
O
CM
≤ V
, θ
≤ + 2.4V
RE = GND or V
≤+12V
JA
OC
CC
L
L
L
L
L
ID
, and T
Conditions
L
= 100pF
= 100 pF
= 100 pF
, respectively when the input changes from high to low levels.
= 100 pF
= 100 pF
L
ID
L
= −200mV
= 500Ω
= 1 kΩ
= 500Ω
= 200mV
CM
A
CM
. The maximum allowable power dissipation at any ambient temperature is P
5
≤ + 12V
≤ + 12V
CC
CC
Min
3.5
2.5
12
35
35
10
20
7
3
Typ
320
315
35
25
30
50
20
20
5
8
5
Max
0.40
500
400
250
250
200
±
95
60
10
40
70
70
50
50
1
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Units
Mbps
mA
mA
mA
µA
kΩ
µA
nS
nS
nS
nS
nS
nS
nS
nS
nS
V
V
D
=