NSC DS89C387TMEA Datasheet

DS89C387
Twelve Channel CMOS Differential Line Driver

General Description

The DS89C387 is a high speed twelve channel CMOS differ­ential driver that meets the requirements of TIA/EIA-422-B.
The DS89C387 features a low I
maximum, which makes it ideal for battery powered and
power conscious applications. The device replaces three
DS34C87s and offers a PC board space savings up to 30%.
The twelve channel driver is available in a SSOP package.
The device is ideal for wide parallel bus applications.

Each TRI-STATE
be active or in a HI-impedance offstate.Eachenableiscom­mon to only two drivers for flexibility and control. The drivers
may be disabled to turn off load current and to save power
when data is not being transmitted.

®

enable (EN) allows the driver outputs to

specification of 1.5 mA

CC

Connection Diagram Functional Diagram

48L SSOP
DS89C387

The driver’s input (DI) is compatible with both TTL and
CMOS signal levels.

Features

n Low power ICC: 1.5 mA maximum
n Meets TIA/EIA-422-B (RS-422)
n Guaranteed AC parameters:

— Maximum driver skew −3 ns
— Maximum transition time −10 ns

n Available in SSOP packaging:

— Requires 30%less PCB space than 3 DS34C87TMs

DS89C387 Twelve Channel CMOS Differential Line Driver

May 1995

1/6 of package

DS012086-2

Truth Table

Enable Input Outputs

EN DI DO DO

LXZZ
HHHL
HLLH

DS012086-1

Order Number DS89C387TMEA

See NS Package Number MS48A

TRI-STATE®is a registered trademarkof National Semiconductor Corporation.

© 1998 National Semiconductor Corporation DS012086 www.national.com

*

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/

Lead Temperature (T

)

L

(Soldering 4 sec.) 260˚C

This device does not meet 2000V ESD rating. (Note 11)

Distributors for availability and specifications.

Supply Voltage (V
DC Voltage (V
DC Output Voltage (V
Clamp Diode Current (I

) −0.5 to 7.0V

CC

) −1.5 to VCC+1.5V

IN

) −0.5 to 7V

OUT

IK,IOK

DC Output Current, per pin (I

or GND Current (ICC)

DC V

CC

Storage Temperature Range (T

Maximum Power Dissipation (P

)

)

OUT

) −65˚C to +150˚C

STG

)@25˚C (Note 3)

D

±

20 mA

±

150 mA

±

500 mA

Operating Conditions

Supply Voltage (V
DC Input or Output Voltage (V
Operating Temperature Range (T

) 4.50 5.50 V

CC

IN,VOUT

A

DS89C387T −40 +85 ˚C

Input Rise or Fall Times (t

) 500 ns

r,tf

Min Max Units

)0VCCV

)

SSOP Package 1359 mW

DC Electrical Characteristics (Notes 2, 4)

=

V

V

IH

V

IL

V

OH

V

OL

V

T

|V

T

V

OS

|V

OS–VOS

I

IN

I

CC

I

OZ

I

SC

I

OFF

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 device
should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation.

Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive; all currents out of device pins are negative.
Note 3: Ratings apply to ambient temperature at 25˚C. Above this temperature derate SSOP (MEA) Package 10.9 mW/˚C.
Note 4: Unless otherwise specified, min/max limits apply across the −40˚C to 85˚C temperature range. All typicals are given for V
Note 5: See TIA/EIA-422-B for exact test conditions.
Note 6: Measured per input. All other inputs at V
Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted.

±

10%(unless otherwise specified)

5V

CC

Symbol Parameter Conditions Min Typ Max Units

High Level Input 2.0 V

CC

Voltage
Low Level Input GND 0.8 V
Voltage
High Level Output V
Voltage I
Low Level Output V
Voltage I
Differential Output R

=

or VIL, 2.5 3.4 V

V

IN

IH

=

−20 mA

OUT

=

or VIL, 0.3 0.5 V

V

IN

IH

=

48 mA

OUT

=

100Ω 2.0 3.1 V

L

Voltage (Note 5)

|–|VT| Difference In R

=

100Ω 0.4 V

L

Differential Output (Note 5)
Common Mode R

=

100Ω 2.0 3.0 V

L

Output Voltage (Note 5)

| Difference In R

=

100Ω 0.4 V

L

Common Mode Output (Note 5)
Input Current V
Quiescent Supply I
Current V

TRI-STATE Output V

=

V

IN

CC

=

0 µA, 600 1500 µA

OUT

=

V

IN

CC

=

V

2.4V or 0.5V (Note 6) 0.8 2.0 mA

IN

=

V

OUT

Leakage Current Control=V
Output Short V

=

V

IN

CC

, GND, VIH,orV

IL

or GND

CC

IL

or GND

±

0.5

or GND −30 −115 −150 mA

±

1.0 µA

±

5.0 µA

Circuit Current (Notes 5, 7)
Power Off Output V

CC

=

0V V

Leakage Current (Note 5) V

or GND.

CC

=

6V 100 µA

OUT

=

−0.25V −100 µA

OUT

=

5V and T

CC

=

25˚C.

A

V

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Switching Characteristics (Note 4)

=

V

±

10%,tr,tf≤6ns(

5V

CC

Figures 1, 2, 3, 4

)

Symbol Parameter Conditions Min Typ Max Units

t

PLH,tPHL

Propagation Delay S1 Open 2 6 11 ns

Input to Output
Skew (Note 8) S1 Open 0 0.5 3 ns
t

TLH,tTHL

Differential Output Rise S1 Open 6 10 ns

And Fall Times
t

PZH

t

PZL

t

PHZ

t

PLZ

C

PD

Output Enable Time S1 Closed 12 25 ns

Output Enable Time S1 Closed 13 26 ns

Output Disable Time (Note 9) S1 Closed 4 8 ns

Output Disable Time (Note 9) S1 Closed 6 12 ns

Power Dissipation 100 pF

Capacitance (Note 10)
C

IN

Note 8: Skew is defined as the difference in propagation delays between complementary outputs at the crossing point.
Note 9: Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are less than indicated

due to the delay added by the RC time constant of the load.
Note 10: C

PD

.

I

CC

Note 11: ESD Rating: HBM (1.5 kΩ, 100 pF)

Inputs ≥ 1500V
Outputs ≥ 1000V
EIAJ (0Ω, 200 pF)
All Pins ≥ 350V

Input Capacitance 6 pF

determines the no load dynamic power consumption, P

=

V2CCf+ICCVCC, and the no load dynamic current consumption, I

C

D

PD

=

C

S

PDVCC

Logic Diagram

f+

DS012086-3

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