DS78C120 datasheet(2/9 Pages) NSC

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Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage

18V

Input Voltage

±25V

Strobe Voltage

18V

Output Sink Current

50 mA

Maximum Power Dissipation (Note 1) at 25˚C

Cavity Package

1433 mW

Molded Package

1362 mW

Storage Temperature Range

−65˚C to +150˚C

Lead Temperature (Soldering, 4 seconds)

260˚C

Operating Conditions

Min

Max

Units

Supply Voltage (V

CC)

4.5

Temperature (T

DS78C120

−55

+125

˚C

Common-Mode Voltage (V

CM)

−15

+15

Note 1: Derate cavity package 9.6 mW/˚C; derate molded package

10.9 mW/˚C above 25˚C.

Electrical Characteristics (Notes 3, 4)

Symbol

Parameter

Conditions

Min

Typ

Max Units

Differential Threshold

OUT = −200 µA,

−7V

≤ V

CM ≤ 7V

0.06

0.2

Voltage

OUT ≥ V CC − 1.2V

−15V

≤ V

CM ≤ 15V

0.06

0.3

Differential Threshold

OUT = 1.6 mA,VOUT ≤ 0.5V

−7V

≤ V

CM ≤ 7V

−0.08

−0.2

Voltage

−15V

≤ V

CM ≤ 15V

−0.08

−0.3

Differential Threshold

OUT = −200 µA,

−7V

≤ V

CM ≤ 7V

0.47

0.7

Voltage Fail-Safe

OUT ≥ VCC − 1.2V

Offset = 5V

OUT = 1.6 mA,VOUT ≤ 0.5V

−7V

≤ V

CM ≤ 7V

0.2

0.42

Input Resistance

−15V

≤V

CM ≤ 15V, 0V ≤ VCC ≤ 15V

Ω

Line Termination

Resistance

A = 25˚C

100

180

300

Ω

Offset Control Resistance

A = 25˚C

Ω

IND

Data Input Current

≤ V

CC ≤ 15V

CM = 10V

3.1

(Unterminated)

CM = 0V

−0.5

CM = −10V

−2

−3.1

THB

Input Balance

OUT = 200 µA, VOUT ≥

−7V

≤ V

CM ≤ 7V

0.1

0.4

(Note 6)

CC − 1.2V, RS = 500Ω

OUT = 1.6 mA,VOUT ≤ 0.5V

−7V

≤ V

CM ≤ 7V

−0.1

−0.4

S = 500Ω

Logical “1” Output Voltage

OUT = −200 µA, VDIFF = 1V

CC − 1.2

CC − 0.75

Logical “0” Output Voltage

OUT = 1.6 mA, VDIFF = −1V

0.25

0.5

Power Supply Current

15V

≤ V

CM ≤ −15V,

CC = 5.5V

DIFF = −0.5V

(Both Receivers)

CC = 15V

IN(1)

Logical “1” Strobe Input

Current

STROBE = 15V, VDIFF = 3V

100

µA

IN(0)

Logical “0” Strobe Input

Current

STROBE = 0V, VDIFF = −3V

−0.5

−100

µA

Logical “1” Strobe Input

OL ≤ 0.5V, IOUT = 1.6 mA

CC = 5V

3.5

2.5

Voltage

CC = 10V

8.0

5.0

CC = 15V

12.5

7.5

Logical “0” Strobe Input

Voltage

OH V CC − 1.2V,

CC = 5V

2.5

1.5

OUT = −200 µA

CC = 10V

5.0

2.0

CC = 15V

7.5

2.5

Output Short-Circuit

Current

OUT = 0V, VCC = 15V, VSTROBE = 0V, (Note 5)

−5

−20

−40

Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they

are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation.

Note 3: Unless otherwise specified min/max limits apply across the −55˚C to +125˚C temperature range for the DS78C120. All typical values for TA = 25˚C, VCC =

5V and VCM = 0V.

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