MAX1487CSA Datasheet, PDF (10/17 Pages) Maxim Integrated Products – Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
_______________________________________________________Switching Waveforms
3V
DI
1.5V
0V
t_PLH
1.5V
t_PHL
1/2 V_O
Z
V_O
Y
1/2 V_O
V_DIFF = V (Y) - V (Z)
V_DIFF
V_O
0V
-V_O
10%
90%
90%
10%
t_R
t_F
t_{SKEW =} | t_PLH - t_PHL |
Figure 8. Driver Propagation Delays
3V
DE
1.5V
0V
Y, Z
V_OL
Y, Z
0V
1.5V
t_ZL(SHDN), t_ZL
t_LZ
2.3V _{OUTPUT NORMALLY LOW}
OUTPUT NORMALLY HIGH
2.3V
t_ZH(SHDN), t_ZH
t_HZ
V_OL + 0.5V
V_OH - 0.5V
Figure 9. Driver Enable and Disable Times (except MAX488 and
MAX490)
V_OH
RO
V_OL
A-B ^VID
-V_ID
0V
1.5V
OUTPUT
1.5V
t_PHL
t_PLH
INPUT
0V
3V
RE
1.5V
0V
V_CC
RO
RO
0V
1.5V
t_ZL(SHDN), t_ZL
t_LZ
1.5V _{OUTPUT NORMALLY LOW}
OUTPUT NORMALLY HIGH
1.5V
t_ZH(SHDN), t_ZH
t_HZ
V_OL + 0.5V
V_OH - 0.5V
Figure 10. Receiver Propagation Delays
Figure 11. Receiver Enable and Disable Times (except MAX488
and MAX490)
_________________Function Tables (MAX481/MAX483/MAX485/MAX487/MAX1487)
Table 1. Transmitting
Table 2. Receiving
INPUTS
RE
DE
DI
X
1
1
OUTPUTS
Z
Y
0
1
INPUTS
OUTPUT
RE
DE
A-B
RO
0
0
> +0.2V
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z_* High-Z_*
X = Don’t care
High-Z = High impedance
*Shutdown mode for MAX481/MAX483/MAX487
0
0
< -0.2V
0
0
0
Inputs open
1
1
0
X
High-Z_*
X = Don’t care
High-Z = High impedance
*Shutdown mode for MAX481/MAX483/MAX487
10
Maxim Integrated