NSC DS3487N, DS3487MX, DS3487M Datasheet
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
n Four independent drivers
n TRI-STATE
®
outputs
n Fast propagation times (typ 10 ns)
n TTL compatible
n 5V supply
n Output rise and fall times less than 15 ns
n Pin compatible with DS8924 and MC3487
Block and Connection Diagrams
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 SemiconductorCorporation.
DS005780-1
Dual-In-Line Package
DS005780-2
Top View
Order Number DS3487M or DS3487N
See NS Package Number M16A or N16E
May 1998
DS3487 Quad TRI-STATE Line Driver
© 1998 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
=
48 mA 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
|– VT| 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
=
50 pF 17 25 ns
t
PLZ
Enable to Output R
L
=
200Ω,C
L
=
50 pF 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 V
CC
=
5V and T
A
=
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.
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