HIN232IP datasheet(9/20 Pages) INTERSIL

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Detailed Description

The HIN232 thru HIN241 family of RS-232

transmitters/receivers are powered by a single +5V power

supply (except HIN239), feature low power consumption, and

meet all ElA RS-232C 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 16kHz. 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 one, C2 is

also charged to 2VCC, and then during phase two, 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

Ω, and the output impedance of the

voltage inverter section (V-) is approximately 450

Ω. A typical

application uses 1

µF 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 (HIN236, HIN240 and HIN241),

SHUTDOWN control line set to logic “1”, 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 10

µA. The

transmitter outputs are disabled and the receiver outputs are

placed in the high impedance state.

TIMING CHARACTERISTICS

Baud Rate (1 Transmitter Switching)

RL = 3kΩ

120

kbps

Output Enable Time, tEN

HIN236, HIN239, HIN240, HIN241

400

Output Disable Time, tDIS

HIN236, HIN239, HIN240, HIN241

250

Propagation Delay, tPD

RS-232 to TTL

0.5

µs

Instantaneous Slew Rate SR

CL = 10pF, RL = 3kΩ, TA = 25

oC (Note 4)

µs

Transition Region Slew Rate, SRT

RL = 3kΩ, CL = 2500pF Measured from +3V to -3V or

-3V to +3V, 1 Transmitter Switching

-3

µs

TRANSMITTER OUTPUTS

Output Voltage Swing, TOUT

Transmitter Outputs, 3k

Ω to Ground

±5

±9

±10

Output Resistance, TOUT

VCC = V+ = V- = 0V, VOUT = ±2V

300

Ω

RS-232 Output Short Circuit Current, ISC

TOUT shorted to GND

±10

NOTE:

Guaranteed by design.

Electrical Specifications

Test Conditions: VCC = +5V ±10%, TA = Operating Temperature Range (Continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

VCC

GND

OSCILLATOR

VCC

GND

V+ = 2VCC

GND

V- = -(V+)

C1+

C1-

C2-

C2+

VOLTAGE INVERTER

VOLTAGE DOUBLER

FIGURE 1. CHARGE PUMP

HIN232, HIN236, HIN237, HIN238, HIN239, HIN240, HIN241

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