DS3487
DS3487 Quad TRI-STATE Line Driver
Literature Number: SNLS355B
DS3487
Quad TRI-STATE®Line Driver
General Description
National’s quad RS-422 driver features four independent
drivers which comply with EIA Standards for the electrical
characteristics of balanced voltage digital interface circuits.
The outputs are TRI-STATE structures which are forced to a
high impedance state when the appropriate output control
pin reaches a logic zero condition. All input pins are PNP
buffered to minimize input loading for either logic one or logic
zero inputs.
Features
nFour independent drivers
nTRI-STATE ®outputs
nFast propagation times (typ 10 ns)
nTTL compatible
n5V supply
nOutput rise and fall times less than 15 ns
nPin compatible with DS8924 and MC3487
Block and Connection Diagrams
Dual-In-Line Package
00578001
00578002
Top View
Order Number DS3487M or DS3487N
See NS Package Number M16A or N16E
Truth Table
Input Control Non-Inverting Inverting
Input Output Output
HH H L
LH L H
XL Z Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE(high impedance)
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
May 1998
DS3487 Quad TRI-STATE Line Driver
© 2004 National Semiconductor Corporation DS005780 www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 8V
Input Voltage 5.5V
Storage Temperature −65˚C to +150˚C
Maximum Power Dissipation (Note 1) at 25˚C
Molded DIP Package 1476 mW
SO Package 1051 mW
Lead Temperature
(Soldering, 4 seconds) 260˚C
Operating Conditions
Min Max Units
Supply Voltage, V
CC
DS3487 4.75 5.25 V
Temperature (T
A
)
DS3487 0 +70 ˚C
Note 1: Derate DIP molded package 11.9 mW/˚C above 25˚C. Derate SO
package 8.41 mW/˚C above 25˚C.
Electrical Characteristics (Notes 3, 4, 5, 6)
Symbol Parameter Conditions Min Typ Max Units
V
IL
Input Low Voltage 0.8 V
V
IH
Input High Voltage 2.0 V
I
IL
Input Low Current V
IL
= 0.5V −200 µA
I
IH
Input High Current V
IH
= 2.7V 50 µA
V
IH
= 5.5V 100 µA
V
CL
Input Clamp Voltage I
CL
= −18 mA −1.5 V
V
OL
Output Low Voltage I
OL
=48mA 0.5 V
V
OH
Output High Voltage I
OH
= −20 mA 2.5 V
I
OS
Output Short-Circuit Current −40 −140 mA
I
OZ
Output Leakage Current
(TRI-STATE)
V
O
= 0.5V −100 µA
V
O
= 5.5V 100 µA
I
OFF
Output Leakage Current Power OFF V
CC
=0V V
O
= 6V 100 µA
V
O
= −0.25V −100 µA
|V
OS
–V
OS
| Difference in Output Offset Voltage 0.4 V
V
T
Differential Output Voltage 2.0 V
|V
T
|– V
T
| Difference in Differential Output
Voltage
0.4 V
I
CC
Power Supply Current Active 50 80 mA
TRI-STATE®35 60 mA
Switching Characteristics
V
CC
= 5V, T
A
= 25˚C
Symbol Parameter Conditions Min Typ Max Units
t
PHL
Input to Output 10 15 ns
t
PLH
Input to Output 10 15 ns
t
THL
Differential Fall Time 10 15 ns
t
TLH
Differential Rise Time 10 15 ns
t
PHZ
Enable to Output R
L
= 200Ω,C
L
=50pF 17 25 ns
t
PLZ
Enable to Output R
L
= 200Ω,C
L
=50pF 15 25 ns
t
PZH
Enable to Output R
L
=∞,C
L
= 50 pF, S1 Open 11 25 ns
t
PZL
Enable to Output R
L
= 200Ω,C
L
= 50 pF, S2 Open 15 25 ns
Note 2: “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 table of “Electrical Characteristics” provides conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS3487. All typicals are given for VCC = 5V and TA= 25˚C.
Note 4: All currents into device pins are positive, all currents out of device pins as negative. All voltages are referenced to ground unless otherwise specified.
Note 5: Only one output at a time should be shorted.
Note 6: Symbols and definitions correspond to EIA RS-422, where applicable.
DS3487
www.national.com 2
AC Test Circuits and Switching Time Waveforms
00578003
00578004
Input pulse: f = MHz, 50%; tr=t
f≤15 ns.
FIGURE 1. Propagation Delays
00578005
S1 and S2 closed except as noted.
CLincludes probe and jig capacitance.
00578006
Input pulse: f = MHz, 50%; tr=t
f≤15 ns.
S1 = open for tPZH
S2 = open for tPZL
FIGURE 2. TRI-STATE Enable and Disable Delays
DS3487
www.national.com3
AC Test Circuits and Switching Time Waveforms (Continued)
00578007
00578008
Input pulse: f = MHz, 50%; tr=t
f≤15 ns.
FIGURE 3. Differential Rise and Fall Times
DS3487
www.national.com 4
Physical Dimensions inches (millimeters) unless otherwise noted
Small Outline Package (M)
Order Number DS3487M
NS Package Number M16A
Molded Dual-In-Line Package (N)
Order Number DS3487N
NS Package Number N16E
DS3487
www.national.com5
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
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can be reasonably expected to cause the failure of
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safety or effectiveness.
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www.national.com
DS3487 Quad TRI-STATE Line Driver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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