HIN200 データシートの表示（PDF） - Harris Semiconductor

部品番号

コンポーネント説明

メーカー

HIN200

+5V Powered RS-232 Transmitters/Receivers with 0.1Microfarad External Capacitors

Harris Semiconductor 

HIN200 thru HIN213

Detailed Description

The HIN200 thru HIN213 family of RS-232 transmitters/receiv-

ers are powered by a single +5V power supply (except HIN201

and HIN209), 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 gener-

ate +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 approxi-

mately 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 (HIN200, 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 10µA. The transmitter

outputs are disabled and the receiver outputs (except for

HIN213, R4 and R5) are placed in the high impedance state.

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 rejec-

tion. The receiver Enable line (EN, on HIN206, HIN209, 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

400kΩ

TXIN

GND < TXIN < VCC

V-

300Ω

TOUT

V- < VTOUT < V+

FIGURE 2. TRANSMITTER

VCC

RXIN

-30V < RXIN < +30V 5kΩ

GND

ROUT

GND < VROUT < VCC

FIGURE 3. RECEIVER

Transmitters

The transmitters are TTL/CMOS compatible inverters which

translate the inputs to RS-232 outputs. The input logic thresh-

old 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 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, VCC = 4.5V, and maximum allowable operating

temperature. The transmitters have an internally limited output

slew rate which is less than 30V/µs. The outputs are short cir-

cuit 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 VCC = 0V.

Receivers

The receiver inputs accept up to ±30V while presenting the

required 3kΩ to 7kΩ 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

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 0.5µs. This prop-

agation delay may increase slightly during shutdown. When

entering shut down mode, receivers R4 and R5 are not valid

for 80µs 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 0.1µF capacitors.

8-13

Share Link: