NSC DS36954VX, DS36954V, DS36954MX, DS36954M Datasheet

DS36954
Quad Differential Bus Transceiver

General Description

The DS36954 is a low power, quad EIA-485 differential bus
transceiver especially suited for high speed, parallel, multi­point, I/O bus applications.A compact 20-pin surface mount
PLCC or SOIC package provides high transceiver integra­tion and a very small PC board footprint.

Propagation delay skew between devices is specified to aid
in parallel interface designs— limits on maximum and mini­mum delay times are guaranteed.

Five devices can implement a complete SCSI initiator or tar­get interface. Three transceivers in a package are pinned out

for data bus connections. The fourth transceiver, with the
flexibility provided by its individual enables, can serve as a
control bus transceiver.

Features

n Pinout for SCSI interface
n Compact 20-pin PLCC or SOIC package
n Meets EIA-485 standard for multipoint bus transmission
n Greater than 60 mA source/sink currents
n Thermal shutdown protection
n Glitch-free driver outputs on power up and down

Connection Diagrams Logic Diagrams

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

DS011014-1

Order Number DS36954V

See NS Package Number V20A

DS011014-19

Order Number DS36954M

See NS Package Number M20B

DS011014-2

July 1998

DS36954 Quad Differential Bus Transceiver

© 1999 National Semiconductor Corporation DS011014 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
M Package 1.73W

Derate V Package 13.9 mW/˚C above +25˚C

Derate M Package 13.7 mW/˚C above +25˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature

(Soldering 4 Sec.) 260˚C

Recommended
Operating Conditions

Min Max Units

Supply Voltage, V

CC

4.75 5.25 V
Bus Voltage −7 +12 V
Operating Free Air

Temperature (T

A

) 0 +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 2.25 V

Voltage (Termination Load) R

L

=

54Ω (EIA-485) 1.5 2.0 V

∆IVODI Change in Magnitude of Driver R

L

=

54 or 100Ω

Differential Output Voltage for (Note 4)

(Figure 1 )

0.2 V

Complementary Output States (EIA-422/485)

V

OC

Driver Common Mode R

L

=

54Ω

(Figure 1 )

(EIA-485) 3.0 V

Output Voltage (Note 5)

∆IVOCI Change in Magnitude of (Note 4)

(Figure 1 )

0.2 V

Common Mode Output Voltage (EIA-422/485)

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

CL

=

−18 mA −1.5 V

I

IH

Input High Current V

IN

=

2.4V (Note 3) 20 µA

I

IL

Input Low Current V

IN

=

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

=

0.2V, I

OH

=

0.4 mA 2.4 3.0 V

V

OL

Output Voltage Low V

ID

=

−0.2V, I

OL

=

4 mA 0.35 0.5 V

V

TH

Differential Input High V

O

=

V

OH,IO

=

−0.4 mA 0.03 0.2 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

www.national.com 2

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

V

CL

Enable Input Clamp Voltage I

CL

=

−18 mA −1.5 V

I

IN

Line Input Current Other Input=0V V

I

=

+12V 0.5 1.0 mA

(Note 8) DE/RE=0.8V

V

I

=

−7V −0.45 −0.8 mA

DE4=0.8V

I

ING

Line Input Current Other Input=0V V

I

=

+12V 1.0 mA

(Note 8) DE/RE and DE4=2V

V

CC

=

3.0V V

I

=

−7V −0.8 mA

T

A

=

+25˚C

I

IH

Enable Input V

IN

=

2.4V V

CC

=

3.0V 1 40 µA

Current High DE/RE

V

CC

=

4.75V 1 µA

V

CC

=

5.25V 1 40 µA

V

IN

=

2.4V V

CC

=

3.0V 1 20 µA

DE4 or RE4

V

CC

=

5.25V 1 20 µA

I

IL

Enable Input V

IN

=

0.8V V

CC

=

3.0V −6 −40 µA

Current Low DE/RE

V

CC

=

4.75V −12 µA

V

CC

=

5.25V −14 −40 µA

V

IN

=

0.8V V

CC

=

3.0V −3 −20 µA

DE4 or RE4

V

CC

=

5.25V −7 −20 µA

I

CCD

Supply Current (Note 10) No Load, DE/RE and DE4=2.0V 75 90 mA

I

CCR

Supply Current (Note 10) No Load, DE/RE and RE4=0.8V 50 70 mA

Switching Characteristics

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DRIVER SINGLE-ENDED CHARACTERISTICS

t

PZH

Output Enable Time to High Level R

L

=

110Ω (

Figure 5

)3540ns

t

PZL

Output Enable Time to Low Level (

Figure 6

)2540ns

t

PHZ

Output Disable Time to High Level (

Figure 5

)1525ns

t

PLZ

Output Disable Time to Low Level (

Figure 6

)3540ns

DRIVER DIFFERENTIAL CHARACTERISTICS

t

r,tf

Rise and 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 12 19 ns

t

SKD

|t

PLHD−tPHLD

| Diff. Skew (

Figures 3, 4, 9

)36ns

RECEIVER CHARACTERISTICS

t

PLHD

Differential Propagation Delays C

L

=

15 pF 9 14 19 ns

t

PHLD

V

CM

=

2.0V 9 13 19 ns

t

SKD

|t

PLHD−tPHLD

| Diff. Receiver Skew (

Figure 7

)13ns

t

PZH

Output Enable Time to High Level C

L

=

15 pF 15 22 ns

t

PZL

Output Enable Time to Low Level (

Figure 8

)2030ns

t

PHZ

Output Disable Time from High Level 20 30 ns

t

PLZ

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 isdefinedaspositive.Currentoutof device pins is defined as negative.Allvoltagesarereferencedto ground unless otherwise speci­fied.

Note 3: I

IH

and IILinclude driver input current and receiver TRI-STATE leakage current on DR(1–3).

Note 4: ∆ IVODI and ∆ IVOCI are changes in magnitude of V

OD

and VOC, respectively, that occur when the input changes state.

www.national.com3