MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
Detailed Description
0.1µF
I
SHDN
The MAX200–MAX209/MAX211/MAX213 consist of three
sections: charge-pump voltage converters, drivers (trans-
mitters), and receivers. Each section is described in detail.
+5.5V
0.1µF
C1+
V
V+
V-
CC
+5V to ±10V Dual Charge-Pump
0.1µF
0.1µF
Voltage Converter
C1-
MAX200
MAX205
MAX206
MAX211
MAX213
The +5V to ±10V conversion is performed by two charge-
pump voltage converters (Figure 4). The first uses capaci-
tor C1 to double +5V to +10V, storing +10V on the V+
output filter capacitor, C3. The second chargepump volt-
age converter uses capacitor C2 to invert +10V to -10V,
storing -10V on the V- output filter capacitor, C4.
C2+
0.1µF
C2-
+5.5V
400kΩ
T1 T0 T5
T
IN
T
OUT
+5.5V
The MAX201 and MAX209 include only the V+ to Vcharge
pump, and are intended for applications that have a V
CC
3kΩ
= +5V supply and a V+ supply in the +9V to +13.2V range.
R1 T0 R5
In shutdown mode, V+ is internally connected to V by
a 1kΩ pulldown resistor and V- is internally connected to
R
R
IN
OUT
CC
+5.5V
ground by a 1kΩ pullup resistor.
5kΩ
EN (EN)
0V OR +5.5V
DRIVE
SHDN
RS-232 Drivers
+5.5V (0)
(SHDN)
GND
When V
= +5V, the typical driver output-voltage swing
CC
is ±8V when loaded with a nominal 5kΩ RS-232 receiver.
The output swing is guaranteed to meet the EIA/TIA-232E
and V.28 specifications, which call for ±5V minimum out-
put levels under worst-case conditions. These include
NOTE 1: ( ) ARE FOR MAX213.
NOTE 2: CAPACITORS CAN BE POLARIZED OR UNPOLARIZED.
Figure 1. Shutdown Current Test Circuit
a minimum 3kΩ load, V
= +4.5V, and the maximum
CC
operating temperature. The open-circuit output-voltage
swing ranges from (V+ - 0.6V) to V-.
EN
INPUT
+3V
Input thresholds are both CMOS and TTL compatible. The
inputs of unused drivers can be left unconnected since
0V
OUTPUT ENABLE TIME
400kΩ pullup resistors to V
are included onchip. Since
CC
all drivers invert, the pullup resistors force the outputs of
unused drivers low. The input pullup resistors typically
source 15μA; therefore, the driver inputs should be driven
high or open circuited to minimize power-supply current
in shutdown mode.
+3.5V
+0.8V
RECEIVER
OUTPUT
C = 150pF
L
+3V
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1mA,
even if the transmitter output is backdriven between 0V
0V
EN
INPUT
OUTPUT ENABLE TIME
and (V
+ 6V). Below -0.5V, the transmitter output is
CC
diode clamped to ground with a 1kΩ series impedance.
The transmitter output is also zener clamped to approxi-
V
- 0.1V
OH
V
OH
RECEIVER
OUTPUTS
+ 2.5V
V
R = 1kΩ
L
+ 0.1V
OL
mately (V
+ 6V), with a 1kΩ series impedance.
CC
V
OL
NOTE: POLARITY OF EN IS REVERSED FOR THE MAX213.
Figure 2. Receiver Output Enable and Disable Timing
Maxim Integrated
│ 5
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