MAX1487(2003) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1487 Datasheet PDF : 19 Pages
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Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
_______________________________________________________Switching Waveforms
3V
DI
1.5V
0V
tPLH
1.5V
tPHL
1/2 VO
Z
VO
Y
1/2 VO
VDIFF = V (Y) - V (Z)
VDIFF
VO
0V
-VO
10%
90%
90%
10%
tR
tF
tSKEW = | tPLH - tPHL |
Figure 8. Driver Propagation Delays
3V
DE
1.5V
0V
Y, Z
VOL
Y, Z
0V
1.5V
tZL(SHDN), tZL
tLZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
tZH(SHDN), tZH
tHZ
VOL +0.5V
VOH -0.5V
Figure 9. Driver Enable and Disable Times (except MAX488 and
MAX490)
VOH
RO
VOL
A-B VID
-VID
0V
1.5V
OUTPUT
1.5V
tPHL
tPLH
INPUT
0V
3V
RE
1.5V
0V
VCC
RO
RO
0V
1.5V
tZL(SHDN), tZL
tLZ
1.5V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
1.5V
tZH(SHDN), tZH
tHZ
VOL + 0.5V
VOH - 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
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z*
X = Don't care
High-Z = High impedance
* Shutdown mode for MAX481/MAX483/MAX487
High-Z*
INPUTS
OUTPUT
RE
DE
A-B
RO
0
0
> +0.2V
1
0
0
< -0.2V
0
0
0
Inputs open
1
1
0
X
X = Don't care
High-Z = High impedance
* Shutdown mode for MAX481/MAX483/MAX487
High-Z*
10 ______________________________________________________________________________________
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