MC1488 Просмотр технического описания (PDF) - ON Semiconductor

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MC1488

Quad Line EIA−232D Driver

ON Semiconductor 

MC1488

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 vary from a minimum 7.0 V (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 output to within 2.0 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. Thus if only a portion of the

four drivers are used for driving EIA−232D lines, the

remainder could be used for DTL to MOS or even DTL to

DTL translation. Figure 17 shows one such combination.

12 V

MDTL

MTTL

Input

1/4 MC1488

MOS Output

1.0 k

(with VSS = GND)

10 k

−12 V

−12 V

Figure 16. MDTL/MTTL−to−MOS Translator

MDTL 2

Input

MDTL 4

NAND

Gate

Input 5

9

MDTL

MHTL

Input

10

12

MDTL

MMOS

Input

13

3

6

MC1488

8

11

1 7 14

MRTL Output

−0.7 V to +3.7 V

3.0 V

MDTL Output

−0.7 V to +5.7 V

5.0 V

MHTL Output

−0.7 V to 10 V

MOS Output

1.0 k

−10 V to 0 V

10 k

−12 V

12 V

Figure 17. Logic Translator Applications

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