Datasheet

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