NSC DS8832N Datasheet
DS7831/DS8832
Dual TRI-STATE
®
Line Driver
DS7831DS8832 Dual TRI-STATE Line Driver
May 1999
General Description
Through simple logic control, the DS7831/DS8832 can be
used as either a quad single-ended line driver or a dual differential line driver. They are specifically designed for party
line (bus-organized) systems. The DS8832 does not have
the V
clamp diodes found on the DS7831.
CC
The DS7831 is specified for operation over the −55˚C to
+125˚C military temperature range. The DS8832 is specified
for operation over the 0˚C to +70˚C temperature range.
Connection and Logic Diagram
Dual-In-Line Package
Order Number DS8832J or DS8832N
See NS Package Number J16A or N16A
For Complete Military 883 Specificatons,
Order Number DS7831J/883, DS7831W/883,
See RETS Data Sheet.
See NS Package Number J16A or W16A
Features
n Series 54/74 compatible
n 17 ns propagation delay
n Very low output impedance —high drive capability
n 40 mA sink and source currents
n Gating control to allow either single-ended or differential
operation
n High impedance output state which allows many outputs
to be connected to a common bus line
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Top View
TRI-STATE®is a registered trademarkof National Semiconductor Corp.
© 1999 National Semiconductor Corporation DS005800 www.national.com
Truth Table
(Shown for A Channels Only)
Differential/
“A” Output Disable Single-Ended Input A1 Output A1 Input A2 Output A2
Mode Control
0 0 0 0 Logical “1” or Same as Logical “1” or Same as
Logical “0” Input A1 Logical “0” Input A2
0
1 X High High
X 1 X X X Impedance X Impedance
X=Don’t Care
0 X 1 Logical “1” or Opposite of Logical “1” or Same as
1 X Logical “0” Input A1 Logical “0” Input A2
State State
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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 7V
Input Voltage 5.5V
Output Voltage 5.5V
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering, 4 sec.) 260˚C
Maximum Power Dissipation (Note 1) at 25˚C
Operating Conditions
Supply Voltage (V
)
CC
DS7831 4.5 5.5 V
DS8831/DS8832 4.75 5.25 V
Temperature (T
)
A
DS7831 −55 +125 ˚C
DS8832 0 +70 ˚C
Note 1: Derate cavity package 9.6 mW/˚C above 25˚C; derate molded package 10.9 mW/˚C above 25˚C.
Min Max Units
Cavity Package 1433 mW
Molded Package 1362 mW
Electrical Characteristics (Notes 3, 4)
Symbol Parameter Conditions Min Typ Max Units
V
Logical “1” Input Voltage V
IH
V
Logical “0” Input Voltage V
IL
V
Logical “1” Output Voltage DS7831 I
OH
V
Logical “0” Output Voltage DS7831 I
OL
I
Logical “1” Input Current V
IH
I
Logical “0” Input Current V
IL
I
Output Disable Current V
OD
I
Output Short Circuit Current V
SC
I
Supply Current V
CC
V
Input Diode Clamp Voltage V
CLI
V
Output Diode Clamp
CLO
Voltage
=
Min 2.0 V
CC
=
Min 0.8 V
CC
=
V
Min I
CC
DS8832 I
=
V
Min I
CC
DS8832 I
=
Max DS7831, V
CC
DS8832, V
=
CC
=
CC
=
CC
=
CC
=
CC
=
V
CC
=
T
25˚C DS8832
A
=
Max, V
Max, V
0.4V −1.0 −1.6 mA
IN
=
2.4V or 0.4V −40 40 µA
O
Max, (Note 5) −40 −100 −120 mA
Max in TRI-STATE 65 90 mA
=
5.0V, T
5.0V, I
A
25˚C, I
OUT
I
OUT
IN
IN
=
−12 mA −1.5 V
IN
=
−12 mA DS7831 −1.5 V
=
12 mA DS7831 V
=
−40 mA 1.8 2.3 V
O
=
−2 mA 2.4 2.7 V
O
=
−40 mA 1.8 2.5 V
O
=
I
−5.2 mA 2.4 2.9 V
O
=
40 mA 0.29 0.50 V
O
=
32 mA 0.40 V
O
=
40 mA 0.29 0.50 V
O
=
I
32 mA 0.40 V
O
=
5.5V 1 mA
=
2.4V 40 µA
+ 1.5 V
CC
Switching Characteristics
=
T
25˚C, V
A
Symbol Parameter Conditions Min Typ Max Units
t
pd0
t
pd1
t
1H
t
0H
=
5V, unless otherwise noted
CC
Propagation Delay to a Logical “0”
from Inputs A1, A2, B1, B2 13 25 ns
Differential Single-ended Mode
Control to Outputs
Propagation Delay to a Logical “1”
from Inputs A1, A2, B1, B2 13 25 ns
Differential Single-ended Mode
Control to Outputs
Delay from Disable Inputs to High
Impedance State (from Logical “1” (See
Figure 4
and
Figure 5
) 6 12 ns
Level)
Delay from Disable Inputs to High
Impedance State (from Logical “0” Level)
14 22 ns
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Switching Characteristics (Continued)
=
T
25˚C, V
A
Symbol Parameter Conditions Min Typ Max Units
t
H1
t
H0
Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating TemperatureRange” 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 −55˚C to +125˚C temperature range for the DS7831 and across the 0˚C to +70˚C range for the
DS8832. All typical values are for T
Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltage referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.
Note 5: Applies for T
=
5V, unless otherwise noted
CC
Propagation Delay from Disable Inputs
to Logical “1” Level (from High 14 22 ns
Impedance State)
Propagation Delay from Disable Inputs
to Logical “0” Level (from High 18 27 ns
Impedance State)
=
25˚C and V
A
=
125˚C only. Only one output should be shorted at a time.
A
=
5V.
CC
Mode of Operation
To operate as a quad single-ended line driver apply logical
“0”s to the output disable pins (to keep the outputs in the normal low impedance mode) and apply logical “0”s to both
Differential/Single-ended Mode Control inputs. All four channels will then operate independently and no signal inversion
will occur between inputs and outputs.
To operate as a dual differential line driver apply logical “0”s
to the Output Disable pins and apply at least one logical “1”
to the Differential/Single-ended Mode Control inputs.
The inputs to the A channels should be connected together
and the inputs to the B channels should be connected together.
In this mode the signals applied to the resulting inputs will
pass non-inverted on the A
the A
and B1outputs.
1
and B2outputs and inverted on
2
When operating in a bus-organized system with outputs tied
directly to outputs of other DS7831, DS8832’s (
Figure 1
), all
devices except one must be placed in the “high impedance”
state. This is accomplished by ensuring that a logical “1” is
applied to at least one of the Output Disable pins of each device which is to be in the “high impedance” state.A NOR gate
was purposely chosen for this function since it is possible
with only two DM5442/DM7442, BCD-to-decimal decoders,
to decode as many as 100 DS7831, DS8832’s (
Figure 2
The unique device whose Disable inputs receive two logical
“0” levels assumes the normal low impedance output state,
providing good capacitive drive capability and waveform integrity especially during the transition from the logical “0” to
logical ”1” state. The other outputs— in the high impedance
state— take only a small amount of leakage current from the
low impedance outputs. Since the logical “1” output current
from the selected device is 100 times that of a conventional
Series 54/74 device (40 mA vs. 400 µA), the output is easily
able to supply that leakage current for several hundred other
DS7831/DS8831’s, DS7832/DS8832’s and still have available drive for the bus line (
Figure 3
).
).
FIGURE 1.
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DS005800-2
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