+5V-Powered, Multichannel RS-232
Drivers/Receivers
MAX220–MAX249
Table 1a. MAX245 Control Pin Configurations
ENT
0
0
1
1
ENR
0
1
0
1
OPERATION STATUS
Normal Operation
Normal Operation
Shutdown
Shutdown
TRANSMITTERS
All Active
All Active
All 3-State
All 3-State
All Active
All 3-State
All Low-Power Receive Mode
All 3-State
RECEIVERS
Table 1b. MAX245 Control Pin Configurations
ENT
0
0
ENR
0
1
OPERATION
STATUS
Normal Operation
Normal Operation
TRANSMITTERS
TA1–TA4
All Active
All Active
TB1–TB4
All Active
All Active
RECEIVERS
RA1–RA5
All Active
RA1–RA4 3-State,
RA5 Active
All Low-Power
Receive Mode
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB5
All Active
RB1–RB4 3-State,
RB5 Active
All Low-Power
Receive Mode
RB1–RB4 3-State,
RB5 Low-Power
Receive Mode
1
0
Shutdown
All 3-State
All 3-State
1
1
Shutdown
All 3-State
All 3-State
Table 1c. MAX246 Control Pin Configurations
ENA
0
0
ENB
0
1
OPERATION
STATUS
Normal Operation
Normal Operation
TRANSMITTERS
TA1–TA4
All Active
All Active
TB1–TB4
All Active
All 3-State
RECEIVERS
RA1–RA5
All Active
All Active
RA1–RA4 3-State,
RA5 Active
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB5
All Active
RB1–RB4 3-State,
RB5 Active
All Active
RB1–RB4 3-State,
RA5 Low-Power
Receive Mode
1
0
Shutdown
All 3-State
All Active
1
1
Shutdown
All 3-State
All 3-State
12
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
