Datasheet

Tables 1a–1d define the control states. The MAX244 has
no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the device.
A logic high at the A-side control input (ENA) causes the
four A-side receivers and drivers to go into a three-state
mode. Similarly, the B-side control input (ENB) causes
the four B-side drivers and receivers to go into a three-
state mode. As in the MAX245, one Aside and one B-side
receiver (RA5 and RB5) remain active at all times. The
entire device is put into shutdown mode when both the A
and B sides are disabled (ENA = ENB = +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and transmit-
ters go into a three-state mode with a logic high on both
ENTA and ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA and
ENTB transmitter enable inputs control three drivers
each. There is no always-active receiver. The device
enters shutdown mode and transmitters go into a three-
state mode with a logic high on both ENTA and ENTB. In
shutdown mode, active receivers operate in a low-power
receive mode at data rates up to 20kb/s.
Applications Information
Figures 5 through 25 show pin configurations and typi-
cal operating circuits. In applications that are sensitive to
power-supply noise, V
CC
should be decoupled to ground
with a capacitor of the same value as C1 and C2 con-
nected as close as possible to the device.
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com
Maxim Integrated │ 16