background image

Electrical Characteristics

(Continued)

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2 and 3)

Symbol

Parameter

Conditions

Reference

Min

Typ

Max

Units

I

IN

Line Input Current

Other Input

e

0V,

DS36C278

V

IN

e a

12V

0

0.19

0.25

mA

DE

e

V

IL

, RE

*

e

V

IL

,

(Note 7)

V

IN

e b

7V

0

b

0.1

b

0.2

mA

V

CC

e

4.75 to 5.25

DS36C278T

V

IN

e a

12V

0

0.19

0.5

mA

or 0V

V

IN

e b

7V

0

b

0.1

b

0.4

mA

I

ING

Line Input Current Glitch

Other Input

e

0V,

DS36C278

V

IN

e a

12V

0

0.19

0.25

mA

DE

e

V

IL

, RE

*

e

V

IL

,

(Note 7)

V

IN

e b

7V

0

b

0.1

b

0.2

mA

V

CC

e a

3.0V or 0V,

DS36C278T

V

IN

e a

12V

0

0.19

0.5

mA

T

A

e

25

§

C

V

IN

e b

7V

0

b

0.1

b

0.4

mA

I

B

Input Balance Test

RS

e

500

X

(422) (Note 9)

g

400

mV

V

OH

High Level Output Voltage

I

OH

e b

4 mA, V

ID

e a

0.2V

Figure 11

RO

3.5

4.6

V

V

OL

Low Level Output Voltage

I

OL

e a

4 mA, V

ID

e b

0.2V

0.3

0.5

V

I

OSR

Short Circuit Current

V

O

e

GND

RO

7

35

85

mA

I

OZR

TRI-STATE Leakage Current V

O

e

0.4V to 2.4V

g

1

m

A

DEVICE CHARACTERISTICS

V

IH

High Level Input Voltage

RE

*

,

DE,

DI

2.0

V

CC

V

V

IL

Low Level Input Voltage

GND

0.8

V

I

IH

High Level Input Current

V

IH

e

V

CC

2

m

A

I

IL

Low Level Input Current

V

CC

e

5V

V

IL

e

0V

b

2

m

A

V

CC

e a

3.0V

b

2

m

A

I

CC

Power Supply Current

Driver and Receiver ON

V

CC

200

500

m

A

I

CCR

(No Load)

Driver OFF, Receiver ON

200

500

m

A

I

CCD

Driver ON, Receiver OFF

200

500

m

A

I

CCZ

Driver and Receiver OFF

200

500

m

A

Switching Characteristics

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 3 and 8)

Symbol

Parameter

Conditions

Reference

Min

Typ

Max

Units

DRIVER CHARACTERISTICS

t

PHLD

Differential Propagation

R

L

e

54

X

, C

L

e

100 pF

Figures 5, 6

10

39

80

ns

Delay High to Low

t

PLHD

Differential Propagation

10

40

80

ns

Delay Low to High

t

SKD

Differential Skew

0

1

10

ns

l

t

PHLD

b

t

PLHD

l

t

r

Rise Time

3

25

50

ns

t

f

Fall Time

3

25

50

ns

t

PHZ

Disable Time High to Z

C

L

e

15 pF

Figures 7, 8

Ð

80

200

ns

t

PLZ

Disable Time Low to Z

RE

*

e

L

Figures 9, 10

Ð

80

200

ns

t

PZH

Enable Time Z to High

C

L

e

100 pF

Figures 7, 8

Ð

50

200

ns

t

PZL

Enable Time Z to Low

RE

*

e

L

Figures 9, 10

Ð

65

200

ns

http://www.national.com

3

Summary of Contents for DS36C278 s and

Page 1: ...en the inputs are left open The DS36C278T is fully specified over the industrial temper ature range b40 C to a85 C Features Y 100 RS 485 compliant Guaranteed RS 485 device interoperation Y Low power C...

Page 2: ...ERENTIAL DRIVER CHARACTERISTICS VOD1 Differential Output Voltage IO e 0 mA No Load 485 422 1 5 5 0 V VOD0 Output Voltage IO e 0 mA 0 5 0 V VOD0 Output Voltage Output to GND 0 5 0 V VOD2 Differential O...

Page 3: ...CE CHARACTERISTICS VIH High Level Input Voltage RE DE DI 2 0 VCC V VIL Low Level Input Voltage GND 0 8 V IIH High Level Input Current VIH e VCC 2 mA IIL Low Level Input Current VCC e 5V VIL e 0V b2 mA...

Page 4: ...Note 2 Current into device pins is defined as positive Current out of device pins is defined as negative All voltages are referenced to ground except VOD1 and VOD2 Note 3 All typicals are given for VC...

Page 5: ...7 FIGURE 7 TRI STATE Test Circuit tPZH tPHZ TL F 12040 8 FIGURE 8 TRI STATE Waveforms tPZH tPHZ TL F 12040 9 FIGURE 9 TRI STATE Test Circuit tPZL tPLZ TL F 12040 10 FIGURE 10 TRI STATE Waveforms tPZL...

Page 6: ...eiver Differential Propagation Delay Waveforms TL F 12040 14 FIGURE 14 Receiver TRI STATE Test Circuit TL F 12040 15 FIGURE 15 Receiver Enable and Disable Waveforms tPLZ tPZL TL F 12040 16 FIGURE 16 R...

Page 7: ...is would allow signals to be transferred to and from each indi vidual seat to 1 main station Usually there is one or two less seats in the last row of the aircraft near the restrooms and food storage...

Page 8: ...http www national com 8...

Page 9: ...Physical Dimensions inches millimeters 8 Lead 0 150 Wide Molded Small Outline Package JEDEC Order Number DS36C278TM DS36C278M NS Package Number M08A http www national com 9...

Page 10: ...rdance support device or system or to affect its safety or with instructions for use provided in the labeling can effectiveness be reasonably expected to result in a significant injury to the user Nat...

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