DS7831 [NSC]
Dual TRI-STATE? Line Driver; 双TRI -STATE ？线路驱动器
| 型号： | DS7831 |
| 厂家： | 
National Semiconductor |
| 描述： | Dual TRI-STATE? Line Driver |
| 文件： | 总9页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 1996
DS7831/DS8831/DS7832/DS8832
Dual TRI-STATE Line Driver
É
General Description
Features
Y
Y
Y
Y
Y
Series 54/74 compatible
Through simple logic control, the DS7831/DS8831,
DS7832/DS8832 can be used as either a quad single-end-
ed line driver or a dual differential line driver. They are spe-
cifically designed for party line (bus-organized) systems.
17 ns propagation delay
Very low output impedanceÐhigh drive capability
40 mA sink and source currents
The DS7832/DS8832 does not have the V clamp diodes
CC
found on the DS7831/DS8831.
Gating control to allow either single-ended or differen-
tial operation
The DS7831 and DS7832 are specified for operation over
a
125 C military temperature range. The
Y
High impedance output state which allows many out-
puts to be connected to a common bus line
b
DS8831 and DS8832 are specified for operation over the
the
55 C to
§
§
a
0 C to 70 C temperature range.
§
§
Connection and Logic Diagram
Dual-In-Line Package
Order Number DS8831N, DS8832J or DS8832N
See NS Package Number J16A or N16A
For Complete Military 883 Specificatons,
See RETS Data Sheet.
Order Number DS7831J/883, DS7831W/883,
DS7832J/883 or DS7832W/883
See NS Package Number J16A or W16A
TL/F/5800–1
Top View
Truth Table (Shown for A Channels Only)
Differential/
‘‘A’’ Output Disable
Single-Ended
Mode Control
Input A1
Output A1
Input A2
Output A2
Logical ‘‘1’’ or Same as Logical ‘‘1’’ or Same as
Logical ‘‘0’’ Input A1 Logical ‘‘0’’ Input A2
Logical ‘‘1’’ or Opposite of Logical ‘‘1’’ or Same as
0
0
0
0
0
0
X
1
1
X
Logical ‘‘0’’
Input A1
Logical ‘‘0’’
Input A2
High
Impedance
State
High
Impedance
State
1
X
1
X
X
X
X
X
e
X
Don’t Care
TRI-STATEÉ is a registered trademark of National Semiconductor Corp.
C
1996 National Semiconductor Corporation
TL/F/5800
RRD-B30M36/Printed in U. S. A.
http://www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Operating Conditions
Min
Max
Units
Supply Voltage (V
CC
DS7831/DS7832
DS8831/DS8832
)
4.5
4.75
5.5
5.25
V
V
Supply Voltage
7V
5.5V
5.5V
Temperature (T )
A
Input Voltage
b
0
a
125
DS7831/DS7832
DS8831/DS8832
55
C
C
§
§
Output Voltage
a
70
b
a
65 C to 150 C
Storage Temperature Range
Lead Temperature (Soldering, 4 sec.)
§
§
§
260 C
Maximum Power Dissipation* at 25 C
Cavity Package
Molded Package
§
1433 mW
1362 mW
*Derate cavity package 9.6 mW/ C above 25 C; derate molded package
§
§
10.9 mW/ C above 25 C.
§
§
Electrical Characteristics (Notes 2 and 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
e
e
V
V
V
Logical ‘‘1’’ Input Voltage
Logical ‘‘0’’ Input Voltage
Logical ‘‘1’’ Output Voltage
V
V
Min
Min
2.0
V
V
IH
CC
0.8
IL
CC
e b
e b
e b
e b
DS7831/DS7832
DS8831/DS8832
DS7831/DS7832
DS8831/DS8832
I
I
I
I
I
I
I
I
40 mA
2 mA
1.8
2.4
1.8
2.4
2.3
2.7
V
OH
O
O
O
O
O
O
O
O
V
e
e
V
V
Min
Min
CC
40 mA
5.2 mA
2.5
V
2.9
V
e
e
e
e
V
OL
Logical ‘‘0’’ Output Voltage
Logical ‘‘1’’ Input Current
40 mA
0.29
0.50
0.40
0.50
0.40
1
V
32 mA
40 mA
32 mA
V
CC
0.29
V
V
e
e
IN
I
V
CC
Max
DS7831/DS7832, V
DS8831/DS8832, V
0.4V
5.5V
2.4V
mA
mA
mA
mA
mA
mA
V
IH
e
40
IN
e
e
e
e
e
e
e
e
b
b
1.6
I
I
I
I
Logical ‘‘0’’ Input Current
Output Disable Current
Output Short Circuit Current
Supply Current
V
V
V
V
V
Max, V
Max, V
1.0
IL
CC
CC
CC
CC
CC
CC
IN
b
b
2.4V or 0.4V
40
40
40
OD
SC
CC
O
b
b
120
Max, (Note 4)
100
Max in TRI-STATE
65
90
e
e b
b
V
V
Input Diode Clamp Voltage
Output Diode Clamp Voltage
5.0V, T
25 C, I
§
12 mA
1.5
1.5
CLI
A
IN
e b
V
T
5.0V,
I
12 mA DS7831/DS8831
DS7832/DS8832
CLO
OUT
b
V
V
e
25 C
§
A
e
a
1.5
I
12 mA
DS7831/DS8831
V
OUT
CC
http://www.national.com
2
e
e
25 C, V
§
CC
Switching Characteristics T
5V, unless otherwise noted
Conditions Min
A
Symbol
Parameter
Typ
Max
Units
t
Propagation Delay to a Logical ‘‘0’’
from Inputs A1, A2, B1, B2
Differential Single-ended Mode
Control to Outputs
pd0
13
25
ns
t
Propagation Delay to a Logical ‘‘1’’
from Inputs A1, A2, B1, B2
Differential Single-ended Mode
Control to Outputs
pd1
13
25
ns
t
1H
t
0H
t
H1
t
H0
Delay from Disable Inputs to High
Impedance State (from Logical ‘‘1’’
Level)
6
12
22
22
27
ns
ns
ns
ns
(SeeFigures 4 and5)
Delay from Disable Inputs to High
Impedance State (from Logical ‘‘0’’
Level)
14
14
18
Propagation Delay from Disable Inputs
to Logical ‘‘1’’ Level (from High
Impedance State)
Propagation Delay from Disable Inputs
to Logical ‘‘0’’ Level (from High
Impedance State)
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’
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.
b
a
Note 2: Unless otherwise specified min/max limits apply across the 55 C to 125 C temperature range for the DS7831 and DS7832 and across the 0 C to
§
§
25 C and V
§
a
e
e
5V.
CC
70 C range for the DS8831 and DS8832. All typical values are for T
§
§
A
Note 3: 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.
e
Note 4: Applies for T
125 C only. Only one output should be shorted at a time.
§
A
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 in-
version will occur between inputs and outputs.
in the ‘‘high impedance’’ state. This is accomplished by en-
suring 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/DS8831’s, DS7832/DS8832’s (Figure 2).
To operate as a dual differential line driver apply logical
‘‘0’’s to the Output Disable pins and apply at least one logi-
cal ‘‘1’’ to the Differential/Single-ended Mode Control in-
puts.
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 in-
tegrity especially during the transition from the logical ‘‘0’’ to
logical ’’1’’ state. The other outputsÐin the high impedance
stateÐtake 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 mA), the output is easily
able to supply that leakage current for several hundred oth-
er DS7831/DS8831’s, DS7832/DS8832’s and still have
available drive for the bus line (Figure 3).
The inputs to the A channels should be connected together
and the inputs to the B channels should be connected to-
gether.
In this mode the signals applied to the resulting inputs will
pass non-inverted on the A and B outputs and inverted on
2
2
the A and B outputs.
1
1
When operating in a bus-organized system with outputs tied
directly to outputs of other DS7831/DS8831’s, DS7832/
DS8832’s (Figure 1), all devices except one must be placed
3
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TL/F/5800–2
FIGURE 1
TL/F/5800–3
FIGURE 2
TL/F/5800–4
FIGURE 3
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4
Typical Performance Characteristics
Propagation Delay from Input
to Output (Channel 2)
Propagation Delay from Input
to Output (Channel 1)
Propagation Delay from Input
to Output (Channel 1)
TL/F/5800–5
5
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Typical Performance Characteristics (Continued)
TL/F/5800–6
Switching Time Waveforms
Input ch
Amplitud
Frequen
s
e
t
r
t
f
TL/F/5800–7
TL/F/5800–8
FIGURE 4
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6
AC Load Circuit
Symbol
Switch S1
Switch S2
C
L
t
t
t
t
t
t
closed
closed
closed
closed
closed
open
closed
closed
closed
closed
open
50 pF
50 pF
*5 pF
*5 pF
50 pF
50 pF
pd1
pd0
0H
1H
H0
closed
H1
*Jig capacitance
TL/F/5800–9
FIGURE 5
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DS7831J, DS8831J, DS7832J or DS8832J
NS Package Number J16A
7
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Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DS8831N or DS8832N
NS Package Number N16A
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