Datasheet

MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
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Function Tables
INPUTS OUTPUTS
A-B
V
ID
DIFFERENTIAL
INPUT VOLTAGE
COMMON-MODE
VOLTAGE
RO
FAULT
CONDITIONED
BY DELAY
FAULT CONDITION
≥0.45V 1 0 Normal operation
<0.45V and ≥0.27V 1 Indeterminate Indeterminate
<0.27V and ≥-0.05V 1 1 Low-input differential voltage
≤-0.05V and ≥-0.2V
Indeterminate
(Note 1)
1 Low-input differential voltage
≤-0.2V and >-0.27V 0 1 Low-input differential voltage
≤-0.27V and >-0.45V 0 Indeterminate
≤-0.45V
≤12V and ≥-7V
00
Indeterminate
X <-7V or >+12V Indeterminate 1 Outside common-mode voltage range
Table 1. MAX3440E/MAX3441E Fault Table
X = Don’t care.
Note 1: Receiver output may oscillate with this differential input condition.
TRANSMITTING
INPUTS OUTPUTS
DE/RE DI A B
0 X High-Z High-Z
1001
1110
Table 2. MAX3440E/MAX3441E
(RS-485/RS-422)
X = Don’t care.
TRANSMITTING
INPUTS OUTPUTS
RE DE DI A B
0 0 X High-Z High-Z
01001
01110
1 0 X Shutdown Shutdown
11001
11110
Table 3. MAX3442E/MAX3443E
(RS-485/RS-422)
X = Don’t care.
TRANSMITTING
INPUTS OUTPUTS CONDITIONS
TXD DE AB —
0 1 High-Z High-Z —
1 1 High-Z High-Z —
0 0 0 1 Dominant state
1 0 High-Z High-Z Recessive state
Table 4. MAX3444E (J1708) Application
RECEIVING
INPUTS OUTPUTS
DE/RE (A - B) RO
0 ≥-0.05V 1
0 ≤-0.2V 0
0 Open/shorted 1
1 X High-Z
Table 5. MAX3440E/MAX3441E
(RS-485/RS-422)
X = Don’t care.