DS16F95, DS36F95
EIA-485/EIA-422A Differential Bus Transceiver
General Description
The DS16F95/DS36F95 Differential Bus Transceiver is a
monolithic integrated circuit designed for bidirectional data
communication on balanced multipoint bus transmission
lines. The transceiver meets both EIA-485 and EIA-422A
standards.
The DS16F95/DS36F95 offers improved performance due to
the use of L-FAST bipolar technology. The L-FAST technol-
ogy allows for higher speeds and lower currents by minimiz-
ing gate delay times. Thus, the DS16F95 and DS36F95 con-
sume less power, and feature an extended temperature
range as well as improved specifications.
The DS16F95/DS36F95 combines a TRI-STATE
differen-
tial line driver and a differential input line receiver, both of
which operate from a single 5.0V power supply. The driver
and receiver have an active Enable that can be externally
connected to function as a direction control. The driver differ-
ential outputs and the receiver differential inputs are inter-
nally connected to form differential input/output (I/O) bus
ports that are designed to offer minimum loading to the bus
whenever the driver is disabled or when V
CC
= 0V. These
ports feature wide positive and negative common mode volt-
age ranges, making the device suitable for multipoint appli-
cations in noisy environments.
The driver is designed to accommodate loads of up to 60 mA
of sink or source current and features positive and negative
current limiting in addition to thermal shutdown for protection
from line fault conditions.
The DS16F95/DS36F95 can be used in transmission line
applications employing the DS96F172 and the DS96F174
quad differential line drivers and the DS96F173 and
DS96F175 quad differential line receivers.
Features
n
Meets EIA-485 and EIA-422A
n
Meets SCSI-1 (5 MHZ) specifications
n
Designed for multipoint transmission
n
Wide positive and negative input/output bus voltage
ranges
n
Thermal shutdown protection
n
Driver positive and negative current-limiting
n
High impedance receiver input
n
Receiver input hysteresis of 50 mV typical
n
Operates from single 5.0V supply
n
Reduced power consumption
n
Pin compatible with DS3695 and SN75176A
n
Military temperature range available
n
Qualified for MIL-STD 883C
n
Standard Military Drawings (SMD) available
n
Available in DIP (J), SOIC (M), LCC (E), and Flatpak
(W) packages
Logic Diagram
Function Tables
Driver
Driver Input
Enable
Outputs
DI
DE
A
B
H
H
H
L
L
H
L
H
X
L
Z
Z
Receiver
Differential Inputs
Enable
Output
AB
RE
RO
V
ID
0.2V
L
H
V
ID
-0.2V
L
L
X
H
Z
H = High Level
L = Low Level
X = Immaterial
Z = High Impedance (Off)
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
DS009629-20
June 1998
DS16F95,
DS36F95
EIA-485/EIA-422A
Differential
Bus
T
ransceiver
1998 National Semiconductor Corporation
DS009629
www.national.com
COMMERCIAL
Absolute Maximum Ratings
(Note 2)
Specifications for the 883 version of this product are
listed separately on the following pages.
Storage Temperature Range
-65C to +175C
Lead Temperature
(Soldering, 60 sec.)
300C
Maximum Package Power Dissipation (Note 1) at 25C
'J' Package
1300 mW
'M' Package
735 mW
Supply Voltage
7.0V
Input Voltage (Bus Terminal)
+15V/-10V
Enable Input Voltage
5.5V
Recommended Operating
Conditions
Min
Typ
Max
Units
Supply Voltage (V
CC
)
DS36F95
4.75
5.0
5.25
V
DS16F95
4.50
5.0
5.50
V
Voltage at Any Bus Terminal
(Separately or Common Mode)
(V
I
or V
CM
)
-7.0
+12
V
Differential Input
12
V
Voltage (V
ID
)
Output Current HIGH (I
OH
)
Driver
-60
mA
Receiver
-400
A
Output Current LOW (I
OL
)
Driver
60
mA
Receiver
16
mA
Operating Temperature (T
A
)
DS36F95
0
+25
+70
C
DS16F95
-55
+25
+125
C
Note 1: Derate 'J' package 8.7 mW/C above 25C.
Derate 'M' package 5.88 mW/C above 25C.
Driver Electrical Characteristics
(Notes 3, 4)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IH
Input Voltage HIGH
2.0
V
V
IL
Input Voltage LOW
0.8
V
V
OH
Output Voltage HIGH
I
OH
= -55 mA
0C to +70C
3.0
V
V
OL
Output Voltage LOW
I
OL
= 55 mA
0C to +70C
2.0
V
V
IC
Input Clamp Voltage
I
I
= -18 mA
-1.3
V
|V
OD1
|
Differential Output Voltage
I
O
= 0 mA
6.0
V
|V
OD2
|
Differential Output Voltage
R
L
= 100
,
Figure 1
2.0
2.25
V
R
L
= 54
,
Figure 1
1.5
2.0
|V
OD
|
Change in Magnitude of
R
L
= 54
or 100
,
-40C to +125C
0.2
V
Differential Output Voltage
Figure 1
-55C to +125C
0.4
(Note 5)
V
OC
Common Mode Output
Voltage (Note 6)
3.0
V
|V
OC
|
Change in Magnitude of
Common Mode Output
Voltage (Note 5)
0.2
V
I
O
Output Current (Note 9)
Output Disabled
V
O
= +12V
1.0
mA
(Includes Receiver I
I
)
V
O
= -7.0V
-0.8
I
IH
Input Current HIGH
V
I
= 2.4V
20
A
I
IL
Input Current LOW
V
I
= 0.4V
-50
A
I
OS
Short Circuit Output Current
(Note 10)
V
O
= -7.0V
-250
V
O
= 0V
-150
mA
V
O
= V
CC
150
V
O
= +12V
250
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2
Driver Electrical Characteristics
(Notes 3, 4) (Continued)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
CC
Supply Current
No Load,
DE = 2V, RE = 0.8V
28
mA
(Total Package)
All Inputs Open
Outputs Enabled
I
CCX
DE = 0.8V, RE = 2V
Outputs Disabled
25
COMMERCIAL
Driver Switching Characteristics
V
CC
= 5.0V, T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
DD
Differential Output Delay Time
R
L
= 60
,
Figure 3
8.0
15
20
ns
t
TD
Differential Output Transition Time
8.0
15
22
ns
t
PLH
Propagation Delay Time,
R
L
= 27
,
Figure 4
6.0
12
16
ns
Low-to-High Level Output
t
PHL
Propagation Delay Time,
6.0
12
16
ns
High-to-Low Level Output
t
ZH
Output Enable Time to High Level
R
L
= 110
,
Figure 5
25
32
ns
t
ZL
Output Enable Time to Low Level
R
L
= 110
,
Figure 6
25
32
ns
t
HZ
Output Disable Time from High Level
R
L
= 110
,
Figure 5
20
25
ns
t
LZ
Output Disable Time from Low Level
R
L
= 110
,
Figure 6
20
25
ns
t
LZL
Output Disable Time from Low Level
Load per
Figure 5
300
ns
with Load Resistor to GND
Timing per
Figure 6
t
SKEW
Skew (Pulse Width Distortion)
R
L
= 60
,
Figure 3
1.0
4.0
ns
Receiver Electrical Characteristics
Over recommended supply voltage and operating temperature ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
TH
Differential Input High
V
O
= 2.7V, I
O
= -0.4 mA
0.2
V
Threshold Voltage
V
TL
Differential Input Low
V
O
= 0.5V, I
O
= 8.0 mA
-0.2
V
Threshold Voltage (Note 7)
V
T+
-V
T-
Hysteresis (Note 8)
V
CM
= 0V
35
50
mV
V
IH
Enable Input Voltage HIGH
2.0
V
V
IL
Enable Input Voltage LOW
0.8
V
V
IC
Enable Input Clamp Voltage
I
I
= -18 mA
-1.3
V
V
OH
Output Voltage HIGH
V
ID
= 200 mV,
0C to +70C
2.8
V
I
OH
= -400 A,
Figure 2
-55C to +125C
2.5
V
OL
Output Voltage LOW
V
ID
= -200 mV,
I
OL
= 8.0 mA
0.45
V
Figure 2
I
OL
= 16 mA
0.50
I
OZ
High Impedance State Output
V
O
= 0.4V to 2.4V
20
A
I
I
Line Input Current (Note 9)
Other Input = 0V
V
I
= +12V
1.0
mA
V
I
= -7.0V
0.8
I
IH
Enable Input Current HIGH
V
IH
= 2.7V
20
A
I
IL
Enable Input Current LOW
V
IL
= 0.4V
-50
A
R
I
Input Resistance
14
18
22
k
I
OS
Short Circuit Output Current
(Note 9)
-15
-85
mA
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3
Receiver Electrical Characteristics
(Continued)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
CC
Supply Current
No Load,
DE = 2V, RE = 0.8V
28
mA
(Total Package)
All Inputs Open
Outputs Enabled
I
CCX
DE = 0.8V, RE = 2V
Outputs Disabled
25
COMMERCIAL
Receiver Switching Characteristics
V
CC
= 5.0V, T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
PLH
Propagation Delay Time,
V
ID
= 0V to +3.0V
14
19
24
ns
Low-to-High Level Output
C
L
= 15 pF,
Figure 7
t
PHL
Propagation Delay Time,
14
19
24
ns
High-to-Low Level Output
t
ZH
Output Enable Time to High Level
C
L
= 15 pF,
Figure 8
10
16
ns
t
ZL
Output Enable Time to Low Level
12
18
ns
t
HZ
Output Disable Time from High Level
C
L
= 5.0 pF,
Figure 8
12
20
ns
t
LZ
Output Disable Time from Low Level
12
18
ns
|t
PLH
-t
PHL
|
Pulse Width Distortion (SKEW)
Figure 7
1.0
4.0
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 tables of "Electrical Characteristics" provide conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the -55C to +125C temperature range for the DS16F95 and across the 0C to +70C range for the
DS36F95. All typicals are given for V
CC
= 5V and T
A
= 25C.
Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 5:
|V
OD
| and
|V
OC
| are the changes in magnitude of V
OD
and V
OC
, respectively, that occur when the input is changed from a high level to a low level.
Note 6: In TIA/EIA-422A and TIA/EIA-485 Standards, V
OC
, which is the average of the two output voltages with respect to ground, is called output offset voltage,
V
OS
.
Note 7: The algebraic convention, where the less positive (more negative) limit is designated minimum, is used in this data sheet for common mode input voltage
and threshold voltage levels only.
Note 8: Hysteresis is the difference between the positive-going input threshold voltage, V
T
+, and the negative-going input threshold voltage, V
T-
.
Note 9: Refer to TIA/EIA-485 Standard for exact conditions.
Note 10: Only one output at a time should be shorted.
Order Number:
DS16F95J, NS Package Number J08A
DS36F95J, NS Package Number J08A
DS36F95M, NS Package Number M08A
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4
MIL-STD 883C
Absolute Maximum Ratings
(Note 2)
For complete Military Product Specifications, refer to
the appropriate SMD or MDS.
Storage Temperature Range
-65C to +175C
Lead Temperature
(Soldering, 60 sec.)
300C
Maximum Power Dissipation (Note 11) at 25C
Ceramic 'E' Package
1800 mW
Ceramic 'J' Package
1300 mW
Ceramic 'W' Package
TBD
Supply Voltage
7.0V
Input Voltage (Bus Terminal)
+15V/-10V
Enable Input Voltage
5.5V
Recommended Operating
Conditions
Min
Max
Units
Supply Voltage (V
CC
)
DS16F95
4.50
5.50
V
Voltage at Any Bus Terminal
(Separately or Common Mode)
(V
I
or V
CM
)
-7.0
+12
V
Differential Input
12
V
Voltage (V
ID
)
Output Current HIGH (I
OH
)
Driver
-60
mA
Receiver
-400
A
Output Current LOW (I
OL
)
Driver
60
mA
Receiver
16
mA
Operating Temperature (T
A
)
DS16F95
-55
+125
C
Note 11: Above T
A
= 25C, derate E package, J package 8.7 mW/C, W
package 125 mW/C.
Driver Electrical Characteristics
(Notes 3, 4)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min
Max
Units
V
IH
Input Voltage HIGH
V
CC
= 5.5V
2.0
V
V
IL
Input Voltage LOW
V
CC
= 5.5V
0.8
V
V
OH
Output Voltage HIGH
I
OH
= -20 mA, V
CC
= 4.5V
3.0
V
V
OL
Output Voltage LOW
I
OL
= +20 mA, V
CC
= 4.5V
2.0
V
V
IC
Input Clamp Voltage
I
I
= -18 mA
-1.3
V
|V
OD1
|
Differential Output Voltage
I
O
= 0 mA, V
IN
= 0.8V or 2V, V
CC
= 5.5V
6.0
V
|V
OD2
|
Differential Output Voltage
R
L
= 100
, V
CC
= 4.5V,
Figure 1
2.0
V
R
L
= 54
, V
CC
= 4.5V,
Figure 1
1.5
|V
OD
|
Change in Magnitude of
R
L
= 54
or 100
,
Figure 1, V
CC
= 4.5V
0.2
V
Differential Output Voltage
(Note 5)
V
OD3
Differential Output Voltage
V
CM
= -7V to +12V
1.0
V
V
OC
Common Mode Output
R
L
= 54
or 100
3.0
V
Voltage (Note 6)
|V
OC
|
Change in Magnitude of
V
CC
= 4.5V, R
L
= 54
or 100
Common Mode Output
0.2
V
Voltage (Note 5)
I
O
Output Current (Note 9)
Output Disabled
V
O
= +12V
1.0
mA
(Includes Receiver I
I
)
V
CC
= 0V or 5.5V
V
O
= -7.0V
-0.8
I
IH
Input Current HIGH
V
I
= 2.4V
20
A
I
IL
Input Current LOW
V
I
= 0.4V
-50
A
I
OS
Short Circuit Output
V
O
= -7.0V, V
IN
= 0V or 3V
-250
Current (Note 10)
V
O
= 0V, V
IN
= 0V or 3V
-150
mA
V
O
= V
CC
, V
IN
= 0V or 3V
150
V
O
= +12V, V
IN
= 0V or 3V
250
I
CC
Supply Current
No Load, DE = 2V, RE = 0.8V, Inputs Open
28
mA
I
CCX
(Total Package)
No Load, DE = 0.8V, RE = 2V, Inputs Open
25
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