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MAX3157CAI

P1-P3P4-P6P7-P9P10-P12P13-P13
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
_______________________________________________________________________________________ 7
DE
5V/div
VY
10V/div
100µs/div
0
+50V
POWER-UP DELAY
(V
ISOCOM
= +50V)
MAX3157toc19
0
20
10
40
30
50
60
0.1 1 10
MAXIMUM COMMON-MODE PEAK VOLTAGE TO
GROUND vs. COMMON-MODE FREQUENCY
MAX3157 toc20
COMMON-MODE FREQUENCY (kHz)
COMMON-MODE PEAK VOLTAGE TO GROUND (V)
MAXIMUM COMMON PEAK
VOLTAGE TO ISOCOM
COMMON-MODE VOLTAGE TO
ISOCOM = 7V PEAK
Typical Operating Characteristics (continued)
(V
CC
= +5V, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = 1µF, C4 = 10nF, T
A
= +25°C, unless otherwise noted.)
Test Circuits and Timing Diagrams
R
R
Y
Z
V
OD
V
OC
Figure 1. Driver DC Test Load
DI
DE
3V
Y
Z
C
L1
C
L2
R
DIFF
V
ID
Figure 3. Driver Timing Test Circuit
RECEIVER
OUTPUT
TEST POINT
1kΩ
1kΩ
S1
S2
V
CC
C
L
100pF
OUTPUT
UNDER TEST
500Ω
S1
S2
V
CC
C
L
Figure 2. Receiver Enable/Disable Timing Test Load
Figure 4. Driver Enable/Disable Timing Test Load
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
8 _______________________________________________________________________________________
DI
3V
0
Z
Y
V
O
0
-V
O
V
O
1.5V
t
DPLH
1/2 V
O
10%
t
DR
90%
90%
t
DPHL
1.5V
1/2 V
O
10%
t
DF
V
DIFF
= V (Y) - V (Z)
V
DIFF
t
DSKEW = |
t
DPLH
- t
DPHL
|
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0
Y, Z
V
OL
Y, Z
0
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
DZL(SHDN)
, t
DZL
t
DLZ
t
DZH(SHDN)
, t
DZH
t
DHZ
DE
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
V
OH
V
OL
A
B
1V
-1V
1.5V 1.5V
OUTPUT
INPUT
RO
t
RPLH
t
RPHL
t
RSKEW = |
t
RPLH
- t
RPHL
|
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0
V
CC
RO
RO
0
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
1.5V
1.5V
t
RZL(SHDN)
, t
RZL
t
RLZ
t
RZH(SHDN)
, t
RZH
t
RHZ
RE
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
R
B
RECEIVER
OUTPUT
ATE
A
V
ID
R
Figure 9. Receiver Propagation Delay Test Circuit
Test Circuits and Timing Diagrams (continued)
MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
_______________________________________________________________________________________ 9
Pin Description
SSOP
ISOCOM
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX3157CAI

Mfr. #:
Buy MAX3157CAI
Manufacturer:
Maxim Integrated
Description:
RS-422/RS-485 Interface IC High CMRR RS-485 Transceiver with 50V Isolation
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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