Datasheet

Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
10 Maxim Integrated
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
_______________________________________________________Switching Waveforms
DI
3V
0V
Z
Y
V
O
0V
-V
O
V
O
1.5V
t
PLH
1/2 V
O
10%
t
R
90%
90%
t
PHL
1.5V
1/2 V
O
10%
t
F
V
DIFF
= V (Y) - V (Z)
V
DIFF
t
SKEW =
| t
PLH
- t
PHL
|
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
Y, Z
V
OL
Y, Z
0V
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
ZL(SHDN)
, t
ZL
t
LZ
t
ZH(SHDN)
, t
ZH
t
HZ
DE
V
OH
V
OL
V
ID
-V
ID
1.5V
0V
1.5V
OUTPUT
INPUT
0V
RO
A-B
t
PLH
t
PHL
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
V
CC
RO
RO
0V
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
1.5V
1.5V
t
ZL(SHDN)
, t
ZL
t
LZ
t
ZH(SHDN)
, t
ZH
t
HZ
RE
_________________Function Tables (MAX481/MAX483/MAX485/MAX487/MAX1487)
Figure 8. Driver Propagation Delays Figure 9. Driver Enable and Disable Times (except MAX488 and
MAX490)
Figure 10. Receiver Propagation Delays
Figure 11. Receiver Enable and Disable Times (except MAX488
and MAX490)
Table 1. Transmitting Table 2. Receiving
INPUTS OUTPUT
RE DE A-B RO
0
0
0
1
0
0
0
0
> +0.2V
< -0.2V
Inputs open
X
1
0
1
High-Z
*
INPUTS OUTPUTS
RE
DE DI Z Y
X
X
0
1
1
1
0
0
1
0
X
X
0
1
High-Z
High-Z
*
1
0
High-Z
High-Z
*
X = Don’t care
High-Z = High impedance
* Shutdown mode for MAX481/MAX483/MAX487
X = Don’t care
High-Z = High impedance
* Shutdown mode for MAX481/MAX483/MAX487