DS3486
Quad RS-422, RS-423 Line Receiver
General Description
National's quad RS-422, RS-423 receiver features four inde-
pendent receivers which comply with EIA Standards for the
electrical characteristics of balanced/unbalanced voltage
digital interface circuits. Receiver outputs are 74LS compat-
ible, TRI-STATE
structures which are forced to a high im-
pedance state when the appropriate output control pin
reaches a logic zero condition. A PNP device buffers each
output control pin to assure minimum loading for either logic
one or logic zero inputs. In addition, each receiver has inter-
nal hysteresis circuitry to improve noise margin and discour-
age output instability for slowly changing input waveforms.
Features
n
Four independent receivers
n
TRI-STATE outputs
n
Internal hysteresis -140 mV (typ)
n
Fast propagation times -19 ns (typ)
n
TTL compatible outputs
n
5V supply
n
Pin compatible and interchangeable with MC3486
Block and Connection Diagrams
TRI-STATE
is a registered trademark of National Semiconductor Corp.
DS005779-1
Dual-In-Line Package
DS005779-2
Top View
Order Number DS3486M or DS3486N
See NS Package Number M16A or N16E
May 1998
DS3486
Quad
RS-422,
RS-423
Line
Receiver
1999 National Semiconductor Corporation
DS005779
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.
Power Supply Voltage, V
CC
8V
Input Common-Mode Voltage,
V
ICM
25V
Input Differential Voltage, V
ID
25V
TRI-STATE Control Input
Voltage, V
I
8V
Output Sink Current, I
O
50 mA
Storage Temperature, T
STG
-65C to +150C
Maximum Power Dissipation (Note 1) at 25C
Molded Dip Package
1362 mW
SO Package
1002 mW
Operating Conditions
Max
Min
Units
Power Supply Voltage, V
CC
4.75
5.25
V
Operating Temperature, T
A
0
70
C
Input Common-Mode Voltage
-7.0
7.0
V
Range, V
ICR
Note 1: Derate Dip molded package 10.2 mW/C above 25C. Derate SO
package 8.01 mW/C above 25C.
Electrical Characteristics
(Note 3)
(Unless otherwise noted, minimum and maximum limits apply over recommended temperature and power supply voltage
ranges. Typical values are for T
A
= 25C, V
CC
= 5V and V
IC
= 0V.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IH
Input Voltage -- High Logic State
2.0
V
(TRI-STATE Control)
V
IL
Input Voltage -- Low Logic State
0.8
V
(TRI-STATE Control)
V
TH(D)
Differential Input Threshold Voltage
-7V
V
IC
7V, V
IH
TRI-STATE = 2V
0.070
0.2
V
I
O
= -0.4 mA, V
OH
2.7V
I
O
= 8 mA, V
OL
0.5V
0.070
-0.2
V
I
IB (D)
Input Bias Current
V
CC
= 0V or 5.25V, Other Inputs at 0V
V
I
= -10V
-3.25
mA
V
I
= -3V
-1.50
mA
V
I
= 3V
1.50
mA
V
I
= 10V
3.25
mA
Input Balance
-7V
V
IC
7V, V
IH(3C)
= 2V,
(Note 5)
V
OH
I
O
= -0.4 mA, V
ID
= 0.4V
2.7
V
V
OL
I
O
= 8 mA, V
ID
= -0.4V
0.5
V
I
OZ
Output TRI-STATE Leakage Current
V
I(D)
= 3V, V
IL
= 0.8V, V
OL
= 0.5V
-40
A
V
I(D)
= -3V, V
IL
= 0.8V, V
OH
= 2.7V
40
A
I
OS
Output Short-Circuit Current
V
I(D)
= 3V, V
IH
TRI-STATE = 2V,
-15
-100
mA
V
O
= 0V, (Note 4)
I
IL
Input Current -- Low Logic State
V
IL
= 0.5V
-100
A
(TRI-STATE Control)
I
IH
Input Current -- High Logic State
V
IH
= 2.7V
20
A
(TRI-STATE Control)
V
IH
= 5.25V
100
A
V
IC
Input Clamp Diode Voltage
I
IN
= -10 mA
-1.5
V
(TRI-STATE Control)
I
CC
Power Supply Current
All Inputs V
IL
= 0V
85
mA
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: All currents into device pins are shown as positive, out of device pins are negative. All voltages referenced to ground unless otherwise noted.
Note 4: Only one output at a time should be shorted.
Note 5: Refer to EIA RS-422/3 for exact conditions.
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2
Switching Characteristics
(Unless otherwise noted, V
CC
= 5V and T
A
= 25C.)
Symbol
Parameter
Min
Typ
Max
Units
t
PHL(D)
Propagation Delay Time -- Differential Inputs to Output
Output High to Low
19
35
ns
t
PLH(D)
Output Low to High
19
30
ns
t
PLZ
TRI-STATE Control to Output
Output Low to TRI-STATE
23
35
ns
t
PHZ
Output High to TRI-STATE
25
35
ns
t
PZH
Output TRI-STATE to High
18
30
ns
t
PZL
Output TRI-STATE to Low
20
30
ns
AC Test Circuits and Switching Time Waveforms
DS005779-3
DS005779-4
Input pulse characteristics:
t
TLH
= t
THL
= 6 ns (10% to 90%)
PRR = 1 MHz, 50% duty cycle
FIGURE 1. Propagation Delay Differential Input to Output
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3
AC Test Circuits and Switching Time Waveforms
(Continued)
DS005779-5
1.5V for t
PHZ
and t
PLZ
1.5V for t
PLZ
and t
PZL
Input pulse characteristics:
t
TLH
= t
THL
= 6 ns (10% to 90%)
PRR = 1 MHz, 50% duty cycle
t
PLZ
DS005779-6
t
PHZ
DS005779-7
t
PZH
DS005779-8
t
PZL
DS005779-9
FIGURE 2. Propagation Delay TRI-STATE Control Input to Output
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4
Physical Dimensions
inches (millimeters) unless otherwise noted
SO Package (M)
Order Number DS3486M
NS Package Number M16A
Molded Dual-In-Line Package (N)
Order Number DS3486N
NS Package Number N16E
www.national.com
5
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