MAX481E_14 Datasheet, PDF (11/16 Pages) Maxim Integrated Products – ±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers

MAX481E/MAX483E/MAX485E/
MAX487E–MAX491E/MAX1487E
±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
3V
DE
DI
Y
V_ID
Z
C_L1
A
R_DIFF
B
C_L2
RO
RE
OUTPUT
UNDER TEST
500Ω
C_L
V_CC
S1
S2
Figure 10. Driver/Receiver Timing Test Circuit
3V
DI
1.5V
0V
Z
Y
V_DIFF
V_O
0V
-V_O
V_O
1/2 V_O
10%
t_R
1.5V
t_PLH
t_PHL
1/2 V_O
V_DIFF = V (Y) - V (Z)
90%
90%
10%
t_F
t_{SKEW =} | t_PLH - t_PHL |
Figure 12. Driver Propagation Delays
V_OH
RO
V_OL
A-B ^VID
-V_ID
0V
1.5V
OUTPUT
1.5V
t_PHL
t_PLH
INPUT
0V
Figure 14. Receiver Propagation Delays
Figure 11. Driver Timing Test Load
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 13. Driver Enable and Disable Times (except MAX488E
and MAX490E)
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 15. Receiver Enable and Disable Times (except MAX488E
and MAX490E)
Maxim Integrated
11