MC1488D データシートの表示（PDF） - STMicroelectronics

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MC1488D

RS232C QUAD LINE DRIVER

STMicroelectronics 

MC1488

Standard RS232B). The addition of the diodes

also permits the MC1488 to withstand faults with

power-supplies of less than the 9.0 V stated

above.

The maximum short-circuit current allowable

under fault conditions is more than guaranteed by

the previously mentioned 10 mA output current

limiting.

The MC1488 is an extremely versatile line driver

with a miriad of possible applications. Several

features of the drivers enhance this versatility :

1. Output Current Limiting - this enables the

circuit designer to define the ouptut voltage levels

independent of power-supplies and can be

accomplished by diode clamping of the output

pins.

2. Power-Supply Range - as can be seen from

the schematic drawing of the drivers, the positive

and negative driving elements of the device are

essentially independent and do not require

matching power-supplies. In fact, the positive

supply can very from a minimum seven volts

(required for driving the negative pulldown

section) to the maximum specified 15 V. The

negative supply can vary from approximately -

2.5 V to the minimum specified - 15 V. The

MC1488 will drive the ouptut to within 2 V of the

positive or negative supplies as long as the

current output limits are not exceeded. The

combination of the current-limiting and

supply-voltage features allow a wide combination

of possible outputs within the same quad

package.

Figure 12 : Slew Rate versus Capacitance for

Isc = 10mA

Figure 13 : Power Supply Protection to Meet

Power-off Fault Conditions

6/9

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