HIN202E, HIN206E, HIN207E, HIN208E, HIN211E, HIN213E, HIN232E
VOLTAGE DOUBLER
VOLTAGE INVERTER
S5
S1
S2
C2+
C1+
V+ = 2V
S6
CC
V
GND
CC
+
+
+
+
C3
C2
C4
C1
-
-
-
-
V
GND
CC
GND
V- = - (V+)
C1-
S4
S3
C2-
S7
S8
RC
OSCILLATOR
FIGURE 3. CHARGE PUMP
and (V+ -0.6V). Each transmitter input has an internal 400kΩ
pullup resistor so any unused input can be left unconnected
and its output remains in its low state. The output voltage
swing meets the RS-232C specifications of ±5V minimum
with the worst case conditions of: all transmitters driving 3kΩ
Detailed Des cription
The HIN2XXE family of high-speed RS-232
transmitters/receivers are powered by a single +5V power
supply, feature low power consumption, and meet all ElA
RS232C and V.28 specifications. The circuit is divided into
three sections: the charge pump, transmitter, and receiver.
minimum load impedance, V
= 4.5V, and maximum
CC
allowable operating temperature. The transmitters have an
internally limited output slew rate which is less than 30V/µs.
The outputs are short circuit protected and can be shorted to
ground indefinitely. The powered down output impedance is
a minimum of 300Ω with ±2V applied to the outputs and
Charge Pump
An equivalent circuit of the charge pump is illustrated in
Figure 3. The charge pump contains two sections: the
voltage doubler and the voltage inverter. Each section is
driven by a two phase, internally generated clock to
generate +10V and -10V. The nominal clock frequency is
125kHz. During phase one of the clock, capacitor C1 is
V
= 0V.
CC
Receivers
The receiver inputs accept up to ±30V while presenting the
required 3kΩ to 7kΩ input impedance even if the power is off
charged to V . During phase two, the voltage on C1 is
CC
added to V , producing a signal across C3 equal to twice
CC
(V
= 0V). The receivers have a typical input threshold of
CC
V
. During phase two, C2 is also charged to 2V , and
CC
then during phase one, it is inverted with respect to ground
CC
1.3V which is within the ±3V limits, known as the transition
region, of the RS-232 specifications. The receiver output is
to produce a signal across C4 equal to -2V . The charge
pump accepts input voltages up to 5.5V. The output
impedance of the voltage doubler section (V+) is
approximately 200Ω, and the output impedance of the
voltage inverter section (V-) is approximately 450Ω. A typical
application uses 0.1µF capacitors for C1-C4, however, the
value is not critical. Increasing the values of C1 and C2 will
lower the output impedance of the voltage doubler and
inverter, increasing the values of the reservoir capacitors, C3
and C4, lowers the ripple on the V+ and V- supplies.
CC
0V to V . The output will be low whenever the input is
CC
greater than 2.4V and high whenever the input is floating or
driven between +0.8V and -30V. The receivers feature 0.5V
hysteresis (except during shutdown) to improve noise
rejection. The receiver Enable line EN, (EN on HIN213E)
when unasserted, disables the receiver outputs, placing
them in the high impedance mode. The receiver outputs are
also placed in the high impedance state when in shutdown
mode (except HIN213E R4 and R5).
During shutdown mode (HIN206E, HIN211E and HIN213E)
V+
the charge pump is turned off, V+ is pulled down to V , V-
CC
V
CC
is pulled up to GND, and the supply current is reduced to
less than 10µA. The transmitter outputs are disabled and the
receiver outputs (except for HIN213E, R4 and R5) are
placed in the high impedance state.
400kΩ
300Ω
T
XIN
XIN
T
OUT
GND < T
< V
CC
V- < V
< V+
TOUT
V-
Trans mitters
The transmitters are TTL/CMOS compatible inverters which
translate the inputs to RS-232 outputs. The input logic
FIGURE 4. TRANSMITTER
threshold is about 26% of V , or 1.3V for V
= 5V. A logic
CC CC
1 at the input results in a voltage of between -5V and V- at
the output, and a logic 0 results in a voltage between +5V
FN4315.16
November 4, 2005
10
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