MAX212
+3V-Powered, Low-Power,
True RS-232 Transceiver
_______________________________________________________________________________________ 7
tions where power consumption is especially critical,
the EIA/TIA-562 standard provides an alternative.
EIA/TIA-562 transmitter output voltage levels need only
reach ±3.7V, and because they need only drive the
same 3kΩ receiver loads specified by RS-232, total
power consumption is considerably reduced. Since the
EIA/TIA-232E and EIA/TIA-562 receiver input voltage
thresholds are the same, interoperability between the two
standards is guaranteed and devices from both stan-
dards will communicate with each other successfully.
Maxim’s MAX560 and MAX561 are EIA/TIA-562 trans-
ceivers that operate on a single supply from 3.0V to
3.6V, and the MAX562 transceiver operates from 2.7V
to 5.25V while producing EIA/TIA-562 levels.
______________________Evaluation Kit
The MAX212 evaluation kit (EV kit) is a fully assem-
bled and tested, surface-mount demonstration board
that provides quick and easy evaluation of the
MAX212.
The MAX212 EV kit is intended for 3.3V ±300mV-pow-
ered EIA/TIA-232E and V.28/V.24 communications
interfaces where 3 drivers and 5 receivers are needed
with minimum power consumption.
A logic or pin-selectable shutdown mode reduces
current to 1µA. While shut down, all receivers can
remain active or can be disabled under logic control
via the EN input.
Figure 4. MAX212 Evaluation Kit
12 34
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
-6
-4
-2
0
2
6
4
TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CURRENT PER TRANSMITTER
5 6
212 GR1
T1
OUT
AND T2
OUT
T3
OUT
T1
IN
AND T2
IN
= GND,
T3
IN
= V
CC
= 3.0V,
T3
OUT
, T2
OUT
, T1
OUT
ALL LOADED
SIMULTANEOUSLY
Figure 3. Mouse Emulation Circuit Current
