Datasheet DS8837N, DS8837M Datasheet (NSC)

DS7837/DS8837 Hex Unified Bus Receiver

DS7837/DS8837 Hex Unified Bus Receiver

February 1996

General Description

The DS7837/DS8837 are high speed receivers designed for
use in bus organized data transmission systems intercon­nected by terminated 120X impedance lines. The external
termination is intended to be 180X resistor from the bus to

a

the

5V logic supply together with a 390X resistor from the
bus to ground. The receiver design employs a built-in input
hysteresis providing substantial noise immunity. Low input
current allows up to 27 driver/receiver pairs to utilize a com­mon bus. Disable inputs provide time discrimination. Disable
inputs and receiver outputs are TTL compatible. Perform­ance is optimized for systems with bus rise and fall times

s

1.0 ms/V.

Typical Application

Connection Diagram

Dual-In-Line Package

Features

Y

Low receiver input current for normal VCCor V
(15 mA typ)

Y

Six separate receivers per package

Y

Built-in receiver input hysteresis (1V typ)

Y

High receiver noise immunity (2V typ)

Y

Temperature insensitive receiver input thresholds track
bus logic levels

Y

TTL compatible disable and output

Y

Molded or cavity dual-in-line or flat package

Y

High speed

CC

TL/F/5811– 1

e

0V

Top View

Order Number DS7837J, DS8837M or DS8837N

See NS Package Number J16A, M16A or N16A

C

1996 National Semiconductor Corporation RRD-B30M36/Printed in U. S. A.

TL/F/5811

TL/F/5811– 2

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 5.5V

Operating Temperature Range

DS7837
DS8837 0

Storage Temperature Range

Maximum Power Dissipation* at 25

Cavity Package 1433 mW
Molded DIP Package 1362 mW

SO Package 1002 mW

Lead Temperature (Soldering, 4 seconds) 260

*Derate cavity package 9.6 mW/§C above 25§C; derate molded DIP package

C above 25§C; derate SO package 8.01 mW/§C above 25§C.

10.9 mW/

§

b

b

C

§

55§Ctoa125§C

Ctoa70§C

§

65§Ctoa150§C

Operating Conditions

Supply Voltage, (V

DS7837 4.5 5.5 V

CC

DS8837 4.75 5.25 V

Temperature (T

DS7837

)

A

DS8837 0

C

§

Min Max Units

)

b

55

a

125

a

70

C

§

C

§

Electrical Characteristics

s

The following apply for V

MIN

s

V

V

CC

MAX,TMIN

Symbol Parameter Conditions Min Typ Max Units

V

TH

V

TL

I

IH

I

IL

V

IH

V

IL

I

IH

I

IL

V

OH

V

OL

I

OS

I

CC

V

CL

High Level Receiver Threshold V

Low Level Receiver Threshold V

Maximum Receiver Input Current V

Logical ‘‘0’’ Receiver Input Current V

Logical ‘‘1’’ Input Voltage Disable 2.0 V

Logical ‘‘0’’ Input Voltage Disable 0.8 V

Logical ‘‘1’’ Input Current Disable Input V

Logical ‘‘0’’ Input Current V

Logical ‘‘1’’ Output Voltage V

Logical ‘‘0’’ Output Voltage V

Output Short Circuit Current V

Power Supply Current V

Input Clamp Diode V

s

s

T

T

, unless otherwise specified (Notes 2 and 3)

MAX

Max DS7837 1.65 2.25 2.65 V

CC

A

e

DS8837 1.80 2.25 2.50 V

e

Min DS7837 0.97 1.30 1.63 V

CC

DS8837 1.05 1.30 1.55 V

e

4V V

IN

e

0.4V, V

IN

e

4V, V

IN

e

0.5V, V

IN

eb

I

400 mA

OH

e

4V, V

IN

e

0.5V, V

IN

e

V

V

CC

MAX

e

4V, V

IN

eb

12 mA, V

IN

e

25§C

T

A

e

V

CC

e

0.4V, Disable Input

IND

e

0.8V,

IND

e

0.8V, I

IND

e

0V, V

IND

, (Note 4)

e

0V, (Per Package) 45.0 60.0 mA

IND

IND

MAX

eb

e

V

CC

MAX

e

V

0V 1.0 50.0 mA

CC

15.0 50.0 mA

1.0 50.0 mA

e

2.4V 80.0 mA

IND

e

V

5.5V 2.0 mA

IND

2.4 V

e

16 mA 0.25 0.4 V

OH

e

0V,

OS

12 mA,

b

18.0

b

1.0

b

3.2 mA

b

55.0 mA

b

1.5 V

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Switching Characteristics T

e

25§C, nominal power supplies unless otherwise noted

A

Symbol Parameter Conditions Min Typ Max Units

t

pd

Propagation Delays V

e

0V, Input to Logical ‘‘1’’ Output, (Note 5) 20 30 ns

IND

Receiver

Input to Logical ‘‘0’’ Output, (Note 6) 18 30 ns

Inpute0V, Input to Logical ‘‘1’’ Output 9 15 ns
Disable, (Note 7)

Note 1: ‘‘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 2: Unless otherwise specified min/max limits apply across the
the DS8837. All typical values are for T

Note 3: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.

Note 4: Only one output at a time should be shorted.

Note 5: Fan-out of 10 load, C

Note 6: Fan-out of 10 load, C

Note 7: Fan-out of 10 load, C

e

25§C and V

A

e

15 pF total. Measured from V

LOAD

e

15 pF total. Measured from V

LOAD

e

15 pF total. Measured from V

LOAD

CC

Input to Logical ‘‘0’’ Output 4 10 ns

b

55§Ctoa125§C temperature range for the DS7837 and across the 0§Ctoa70§C range for

e

5V.

IN

IN

IN

e

1.3V to V

e

2.3V to V

e

1.5V to V

OUT

OUT

OUT

e

e

e

1.5V, V

1.5V, V

1.5V, V

e

0V to 3V pulse.

IN

e

0V to 3V pulse.

IN

e

0V to 3V pulse.

IN

Physical Dimensions inches (millimeters)

Ceramic Dual-In-Line Package (J)

Order Number DS7837J

NS Package Number J16A

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Physical Dimensions inches (millimeters) (Continued)

SO Package (M)

Order Number DS8837M

NS Package Number M16A

DS7837/DS8837 Hex Unified Bus Receiver

Molded Dual-In-Line Package (N)

Order Number DS8837N

NS Package Number N16A

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failure to perform, when properly used in accordance 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.

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