NSC DS36950VX, DS36950V Datasheet

DS36950
Quad Differential Bus Transceiver

General Description

The DS36950 is a low power, space-saving quad EIA-485
differential bus transceiver especially suited for high speed,
parallel, multipoint, computer I/O bus applications. A com­pact 20-pin surface mount PLCC package provides high
transceiver integration and a very small PC board footprint.

Timing uncertainty across an interface using multiple de­vices, a typical problem in a parallel interface, is
specified—minimum and maximum propagation delay
times are guaranteed.

Six devices canimplement a complete IPI master or slavein­terface. Three transceivers in a package are pinned out for

connection to a parallel databus. The fourth transceiver, with
the flexibility provided by its individual enables, can serve as
a control bus transceiver.

Features

n Pinout for IPI interface
n Compact 20-pin PLCC package
n Meets EIA-485 standard for multipoint bus transmission
n Greater than 60 mA source/sink
n Thermal Shutdown Protection

Pinout and Logic Diagram

TRI-STATE®is a registered trademark of National Semiconductor Corporation.

DS010602-1

Order Number DS36950

See NS Package Number V20A

DS010602-2

July 1998

DS36950 Quad Differential Bus Transceiver

© 1999 National Semiconductor Corporation DS010602 www.national.com

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
Control Input Voltage V

CC

+ 0.5V

Driver Input Voltage V

CC

+ 0.5V

Driver Output Voltage/Receiver

Input Voltage −10V to +15V
Receiver Output Voltage 5.5V
Continuous Power Dissipation

@

25˚C

V Package 1.73W

Derate V Package 13.9 mW/˚C above 25˚C
Storage Temp. Range −65˚C to +150˚C
Lead Temp. (Soldering 4 Sec.) 260˚C

Recommended Operating
Conditions

Supply Voltage, V

CC

4.75V to 5.25V
Bus Voltage −7V to +12V
Operating Free Air Temp. (T

A

) 0˚C to +70˚C

Electrical Characteristics (Note 2)

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

DRIVER CHARACTERISTICS

V

ODL

Differential Driver Output I

L

=

60 mA 1.5 1.9 V

Voltage (Full Load) V

CM

=

0V

V

OD

Differential Driver Output R

L

=

100Ω (EIA-422) 2.0 3.5 V

Voltage (Termination Load) R

L

=

54Ω (EIA-485) 1.5 3.2 V

∆IV

OD

I Change in Magnitude of Driver R

L

=

54Ω or 100Ω

Differential Output Voltage for (Note 4) (

Figure 1

) 0.2 V

Complementary Output States (EIA-485)

V

OC

Driver Common Mode Output R

L

=

54Ω 3.0 V

Voltage (Note 5) (

Figure 1

) (EIA-485)

∆IV

OC

I Change in Magnitude of Common (Note 4) (

Figure 1

) 0.2 V

Mode Output Voltage (EIA-485)

V

OH

Output Voltage HIGH I

OH

=

−55 mA 2.7 3.2 V

V

OL

Output Voltage LOW I

OL

=

55 mA 1.4 1.7 V

V

IH

Input Voltage HIGH 2.0 V

V

IL

Input Voltage LOW 0.8 V

V

CL

Input Clamp Voltage I=−18 mA −1.5 V

I

IH

Input High Current V

I

=

2.4V (Note 3) 20 µA

I

IL

Input Low Current V

I

=

0.4V (Note 3) −20 µA

I

OSC

Driver Short-Circuit V

O

=

−7V (EIA-485) −130 −250 mA

Output Current V

O

=

0V (EIA-422) −90 −150 mA

(Note 9) V

O

=

+12V (EIA-485) 130 250 mA

RECEIVER CHARACTERISTICS

I

OSR

Short Circuit Output Current V

O

=

0V (Note 9) −15 −28 −75 mA

I

OZ

TRI-STATE®Output Current V

O

=

0.4V to 2.4V 20 µA

V

OH

Output Voltage High V

ID

=

0.20V, I

OH

=

−0.4 mA 2.4 3.0 V

V

OL

Output Voltage Low V

ID

=

−0.20V, I

OL

=

4 mA 0.35 0.5 V

V

TH

Differential Input High V

O

=

V

OH,IO

=

−0.4 mA 0.03 0.20 V

Threshold Voltage (EIA-422/485)

V

TL

Differential Input Low V

O

=

V

OL,IO

=

4.0 mA −0.20 −0.03 V

Threshold Voltage (Note 6) (EIA-422/485)

V

HST

Hysteresis (Note 7) V

CM

=

0V 35 60 mV

DRIVER AND RECEIVER CHARACTERISTICS

V

IH

Enable Input Voltage High 2.0 V

V

IL

Enable Input Voltage Low 0.8 V

V

CL

Enable Input Clamp Voltage I=−18 mA −1.5 V

I

IN

Line Input Current Other Input=0V V

I

=

+12V 0.5 1 mA

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Electrical Characteristics (Note 2) (Continued)

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

DRIVER AND RECEIVER CHARACTERISTICS

(Note 8) V

I

=

−7V −0.45 −0.8 mA

I

IH

Enable Input Current High V

OH

=

2.4V RE4 or DE

20 µA

REC

60 µA

I

IL

Enable Input Current Low V

OL

=

0.4V RE4 or DE

−20 µA

REC

−60 µA

I

CC

Supply Current (Note 10) No Load, Outputs Enabled 75 90 mA

I

CCZ

Supply Current (Note 10) No Load, Outputs Disabled 50 70 mA

Switching Characteristics

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified

Symbol Conditions Min Typ Max Units

DRIVER SINGLE-ENDED CHARACTERISTICS

t

PZH

R

L

=

110Ω (

Figure 4

)3540ns

t

PZL

R

L

=

110Ω (

Figure 5

)2540ns

t

PHZ

R

L

=

110Ω (

Figure 4

)1525ns

t

PLZ

R

L

=

110Ω (

Figure 5

)3540ns

DRIVER DIFFERENTIAL CHARACTERISTICS

t

R,tF

Rise & Fall Time R

L

=

54Ω 13 16 ns

t

PLHD

Differential Propagation C

L

=

50 pF 9 15 19 ns

t

PHLD

Delays (Note 15) C

D

=

15 pF 9 15 19 ns

t

SKD

|t

PLHD−tPHLD

| Differential Skew (

Figures 3, 8

)36ns

RECEIVER CHARACTERISTICS

t

PLHD

Differential Propagation Delays 9 14 19 ns

t

PHLD

C

L

=

15 pF, V

CM

=

1.5V (

Figure 6

) 9 14 19 ns

t

SKD

|t

PLHD−tPHLD

| Differential Receiver Skew 1 3 ns

t

ZH

Output Enable Time to High Level 15 22 ns

t

ZL

Output Enable Time to Low Level C

L

=

15 pF 20 30 ns

t

HZ

Output Disable Time from High Level (

Figure 7

)1017ns

t

LZ

Output Disable Time from Low Level 17 25 ns

Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.

Note 2: Current into device pins is define as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise speci­fied.

Note 3: I

IH

and IILincludes driver input current and receiver TRI-STATE leakage current.

Note 4: ∆IV

OD

I and ∆IVOCI are changes in magnitude of VODand VOC, respectively, that occur when the input changes state.

Note 5: In EIA Standards EIA-422 and EIA-485, V

OC

, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.

Note 6: Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 7: Hysteresis defined as V

HST

=

V

TH−VTL

.

Note 8: I

IN

includes the receiver input current and driver TRI-STATE leakage current.

Note 9: Short one output at a time.
Note 10: Total package supply current.
Note 11: All typicals are given for V

CC

=

5.0V and T

A

=

25˚C.

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