HIN202 View Datasheet(PDF) - Renesas Electronics
Part Name
Description
Manufacturer
HIN202
Renesas Electronics
HIN202 Datasheet PDF : 20 Pages
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HIN202, HIN206, HIN207, HIN208, HIN211, HIN213
Detailed Description
The HIN202, HIN206, HIN207, HIN208, HIN211, HIN213
family of 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.
Charge Pump
An equivalent circuit of the charge pump is illustrated in Figure
1. 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 charged to VCC . During phase two,
the voltage on C1 is added to VCC, producing a signal across
C3 equal to twice VCC. During phase two, C2 is also charged
to 2VCC, and then during phase one, it is inverted with respect
to ground to produce a signal across C4 equal to -2VCC. The
charge pump accepts input voltages up to 5.5V. The output
impedance of the voltage doubler section (V+) is
approximately 200, and the output impedance of the voltage
inverter section (V-) is approximately 450. A typical
application uses 0.1F 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.
During shutdown mode (HIN206 and HIN211, SD = VCC,
HIN213, SD = 0V) the charge pump is turned off, V+ is pulled
down to VCC, V- is pulled up to GND, and the supply current is
reduced to less than 10A. The transmitter outputs are
disabled and the receiver outputs (except for HIN213, R4 and
R5) are placed in the high impedance state.
Transmitters
The transmitters are TTL/CMOS compatible inverters which
translate the inputs to RS-232 outputs. The input logic
threshold is about 26% of VCC, or 1.3V for VCC = 5V. A logic 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 and (V+
- 0.6V). Each transmitter input has an internal 400k 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 3k minimum load
impedance,
VCC = 4.5V, and maximum allowable operating temperature.
The transmitters have an internally limited output slew rate
which is less than 30V/s. The outputs are short circuit
protected and can be shorted to ground indefinitely. The
powered down output impedance is a minimum of 300 with
2V applied to the outputs and VCC = 0V.
FN3980 Rev 19.00
August 6, 2015
Receivers
The receiver inputs accept up to 30V while presenting the
required 3k to 7k input impedance even if the power is off
(VCC = 0V). The receivers have a typical input threshold of
1.3V which is within the 3V limits, known as the transition
region, of the RS-232 specifications. The receiver output is 0V
to VCC. The output will be low whenever the input is 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 on HIN206 and
HIN211, EN on HIN213) 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 HIN213 R4 and R5).
V+
VCC
400k
TXIN
GND < TXIN < VCC
300
TOUT
V- < VTOUT < V+
V-
FIGURE 2. TRANSMITTER
VCC
RXIN
-30V < RXIN < +30V
5k
ROUT
GND < VROUT < VCC
GND
FIGURE 3. RECEIVER
TIN
OR
RIN
TOUT
OR
ROUT
tPHL
tPLH
VOL
VOL
AVERAGE PROPAGATION DELAY =
tPHL + tPLH
2
FIGURE 4. PROPAGATION DELAY DEFINITION
HIN213 Operation in Shutdown
The HIN213 features two receivers, R4 and R5, which remain
active in shutdown mode. During normal operation the
receivers propagation delay is typically 0.5s. This propagation
delay may increase slightly during shutdown. When entering
shut down mode, receivers R4 and R5 are not valid for 80s
after SD = VIL. When exiting shutdown mode, all receiver
outputs will be invalid until the charge pump circuitry reaches
normal operating voltage. This is typically less than 2ms when
using 0.1F capacitors.
Page 9 of 20
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