HIN208CB Intersil, HIN208CB Datasheet - Page 9

• Manufacturer Part Number: HIN208CB
• Description: IC 4DRVR/4RCVR RS232 5V 24-SOIC
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of HIN208CB

• Number Of Drivers/receivers: 4/4
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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
V
producing a signal across C3 equal to twice V
phase two, C2 is also charged to 2V
phase one, it is inverted with respect to ground to produce a
signal across C4 equal to -2V
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.
During shutdown mode (HIN206 and HIN211, SD = V
HIN213, SD = 0V) the charge pump is turned off, V+ is
pulled down to V
current is reduced to less than 10µA. 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 V
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
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 minimum load impedance,
V
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 V
CC
CC
. During phase two, the voltage on C1 is added to V
= 4.5V, and maximum allowable operating temperature.
CC
, V- is pulled up to GND, and the supply
CC
CC
9
HIN202, HIN206, HIN207, HIN208, HIN211, HIN213
, or 1.3V for V
. The charge pump accepts
CC
CC
= 0V.
, and then during
CC
CC
= 5V. A logic
. During
CC
CC
,
,
Receivers
The receiver inputs accept up to ±30V while presenting the
required 3kΩ to 7kΩ input impedance even if the power is off
(V
1.3V which is within the ±3V limits, known as the transition
region, of the RS-232 specifications. The receiver output is
0V to V
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).
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 0.5µs. This
propagation delay may increase slightly during shutdown.
When entering shut down mode, receivers R4 and R5 are
not valid for 80µs after SD = V
mode, all receiver outputs will be invalid until the charge
pump circuitry reaches normal operating voltage. This is
typically less than 2ms when using 0.1µF capacitors.
CC
AVERAGE PROPAGATION DELAY =
= 0V). The receivers have a typical input threshold of
GND < T
CC
-30V < R
FIGURE 4. PROPAGATION DELAY DEFINITION
R
T
OR
OUT
OUT
. The output will be low whenever the input is
R
T
OR
IN
IN
T
V
XIN
XIN
CC
V+
XIN
V-
R
GND
V
t
< V
XIN
PHL
FIGURE 2. TRANSMITTER
CC
< +30V
CC
FIGURE 3. RECEIVER
400kΩ
5kΩ
IL
. When exiting shutdown
t
t
PLH
PHL +
GND < V
300Ω
2
V- < V
t
PLH
R
ROUT
OUT
T
TOUT
OUT
< V
< V+
CC
V
V
OL
OL