HIN232CB-T View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

HIN232CB-T

+5V Powered RS-232 Transmitters/Receivers

Intersil 

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

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

PARAMETER

TEST CONDITIONS

MIN

TYP

TIMING CHARACTERISTICS

Baud Rate (1 Transmitter Switching)

Output Enable Time, tEN

Output Disable Time, tDIS

Propagation Delay, tPD

Instantaneous Slew Rate SR

Transition Region Slew Rate, SRT

RL = 3kΩ

HIN236, HIN239, HIN240, HIN241

120

-

-

400

HIN236, HIN239, HIN240, HIN241

-

250

RS-232 to TTL

-

0.5

CL = 10pF, RL = 3kΩ, TA = 25oC (Note 4)

-

-

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

-

3

-3V to +3V, 1 Transmitter Switching

TRANSMITTER OUTPUTS

Output Voltage Swing, TOUT

Output Resistance, TOUT

RS-232 Output Short Circuit Current, ISC

NOTE:

4. Guaranteed by design.

Transmitter Outputs, 3kΩ to Ground

VCC = V+ = V- = 0V, VOUT = ±2V

TOUT shorted to GND

±5

±9

300

-

-

±10

MAX UNITS

-

kbps

-

ns

-

ns

-

µs

30

V/µs

-

V/µs

±10

V

-

Ω

-

mA

VCC

GND

VOLTAGE DOUBLER

S1

C1+

S2

+

C1

-

S3

C1-

S4

RC

OSCILLATOR

V+ = 2VCC

VOLTAGE INVERTER

S5

C2+

S6

+

C3

-

VCC

GND

S7

+

C2

-

C2-

S8

+

C4

-

GND

V- = -(V+)

FIGURE 1. CHARGE PUMP

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 200Ω, and the output impedance of the

voltage inverter section (V-) is approximately 450Ω. A typical

application uses 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 (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 10µA. The

transmitter outputs are disabled and the receiver outputs are

placed in the high impedance state.

9

Share Link: