
+5V-Powered, Multichannel RS-232
Drivers/Receivers
TA1–TA4
TB1–TB4
RA1–RA4
RB1–RB4
0
Normal Operation
All Active
0
1
Normal Operation
All Active
All High-Z, except
RB5 stays active on
MAX247
0
1
0
Normal Operation
All Active
All High-Z
All Active
0
1
Normal Operation
All Active
All High-Z
All High-Z, except
RB5 stays active on
MAX247
0
1
0
Normal Operation
All Active
All High-Z
All Active
0
1
0
1
Normal Operation
All Active
All High-Z
All Active
All High-Z, except
RB5 stays active on
MAX247
0
1
0
Normal Operation
All Active
All High-Z
All Active
0
1
Normal Operation
All Active
All High-Z
All High-Z, except
RB5 stays active on
MAX247
1
0
Normal Operation
All High-Z
All Active
1
0
1
Normal Operation
All High-Z
All Active
All High-Z, except
RB5 stays active on
MAX247
1
0
1
0
Normal Operation
All High-Z
All Active
All High-Z
All Active
1
0
1
Normal Operation
All High-Z
All Active
All High-Z
All High-Z, except
RB5 stays active on
MAX247
1
0
Shutdown
All High-Z
Low-Power
Receive Mode
Low-Power
Receive Mode
1
0
1
Shutdown
All High-Z
Low-Power
Receive Mode
All High-Z, except
RB5 stays active on
MAX247
1
0
Shutdown
All High-Z
Low-Power
Receive Mode
1
Shutdown
All High-Z
All High-Z, except
RB5 stays active on
MAX247
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
MAX248
OPERATION
STATUS
ENRB
MAX247
TA1–TA4
TB1–TB4
RA1–RA4
RB1–RB5
TRANSMITTERS
ENRA
ENTB
ENTA
MAX249
TA1–TA3
TB1–TB3
RA1–RA5
RB1–RB5
RECEIVERS
Maxim Integrated
13
MAX220–MAX249