If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)
DC Voltage (V
IN
)
DC Output Voltage (V
OUT
)
Clamp Diode Current (I
IK
, I
OK
)
DC Output Current, per pin (I
OUT
)
DC V
CC
or GND Current (I
CC
)
Storage Temperature Range (T
STG
)
−0.5 to 7.0V
−1.5 to V
CC
+1.5V
−0.5 to 7V
This device does not meet 2000V ESD rating.
(Note 12)
Operating Conditions
Min Max Units
Supply Voltage (V
CC
)
DC Input or Output Voltage (V
IN
, V
OUT
)
Operating Temperature Range (T
A
)
DS34C87T
Input Rise or Fall Times (t
r
, t
f
)
−40 +85
500
˚C
ns
4.50 5.50
0
V
CC
V
V
±
20 mA
±
150 mA
±
150 mA
−65˚C to
+150˚C
Maximum Power Dissipation (P
D
)
@
25˚C (Note
3)
DC Electrical Characteristics
V
CC
= 5V
±
10% (unless otherwise specified)
Symbol
V
IH
V
IL
V
OH
V
OL
V
T
|V
T
|–| V
T
|
V
OS
|V
OS
– V
I
IN
I
CC
OS
|
(Note 4)
Conditions
Min
2.0
0.8
Typ
Max
Units
V
V
V
0.5
V
V
0.4
2.0
3.0
0.4
V
V
V
µA
µA
mA
µA
mA
µA
µA
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Differential Output
Voltage
Difference In
Differential Output
Common Mode
Output Voltage
Difference In
Common Mode Output
Input Current
Quiescent Supply
Current
V
I
I
V
R
R
R
R
V
I
V
V
V
V
IN
= V
IH
or V
IL
,
= −20 mA
= V
IH
or V
IL
,
= 48 mA
= 100
Ω
= 100
Ω
= 100
Ω
= 100
Ω
= V
CC
, GND, V
IH
, or V
IL
= 0 µA,
= V
CC
or GND
= 2.4V or 0.5V (Note 6)
= V
CC
or GND
2.5
3.4
0.3
OUT
IN
OUT
L
2.0
3.1
(Note 5)
L
(Note 5)
L
(Note 5)
L
(Note 5)
IN
±
1.0
200
0.8
500
2.0
OUT
IN
IN
I
OZ
I
SC
I
OFF
TRI-STATE
™
Output
Leakage Current
Output Short
Circuit Current
Power Off Output
Leakage Current
OUT
±
0.5
−30
±
5.0
−150
100
−100
Control = V
IL
IN
= V
CC
or GND
V
OUT
= 6V
V
OUT
= −0.25V
(Notes 5, 7)
V
CC
= 0V
(Note 5)
Note 1:
Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device
should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation.
Note 2:
Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive; all currents out of device pins are negative.
Note 3:
Ratings apply to ambient temperature at 25˚C. Above this temperature derate N Package 13.89 mW/˚C, and M Package 9.80 mW/˚C.
Note 4:
Unless otherwise specified, min/max limits apply across the −40˚C to 85˚C temperature range. All typicals are given for V
CC
= 5V and T
A
= 25˚C.
Note 5:
See EIA Specification RS-422 for exact test conditions.
www.national.com
2
DS34C87T
DC Electrical Characteristics
(Note 4) (Continued)
Note 6:
Measured per input. All other inputs at V
CC
or GND.
Note 7:
This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted.
Switching Characteristics
(Note 4)
V
CC
= 5V
±
10%, t
r
, t
f
≤
6 ns (Figures
1, 2, 3, 4)
Symbol
t
PLH
, t
PHL
Skew
t
TLH
, t
THL
t
PZH
t
PZL
t
PHZ
t
PLZ
C
PD
C
IN
Parameter
Propagation Delay
Input to Output
(Note 8)
Differential Output Rise
And Fall Times
Output Enable Time
Output Enable Time
Output Disable Time (Note 9)
Output Disable Time (Note 9)
Power Dissipation
Capacitance (Note 10)
Input Capacitance
6
pF
S1 Closed
S1 Closed
S1 Closed
S1 Closed
12
13
4
6
100
25
26
8
12
ns
ns
ns
ns
pF
S1 Open
S1 Open
0.5
6
3
10
ns
ns
Conditions
S1 Open
Min
Typ
6
Max
11
Units
ns
Note 8:
Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
Note 9:
Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are less than indicated
due to the delay added by the RC time constant of the load.
Note 10:
C
PD
determines the no load dynamic power consumption, P
D
= C
PD
V
2
CC f + I
CC
V
CC
, and the no load dynamic current consumption, I
S
= C
PD
V
CC
f
+ I
CC
.
Comparison Table of Switching Characteristics into “LS-Type” Load
(Note
V
CC
= 5V, T
A
= +25˚C, t
r
≤
6 ns, t
f
≤
6 ns (Figures
4, 5, 6, 7, 8, 9)
Symbol
t
PLH
, t
PHL
Skew
t
THL
, t
TLH
t
PHZ
t
PLZ
t
PZH
t
PZL
Parameter
Propagation Delay
Input to Output
(Note 8)
Differential Output Rise
and Fall Times
Output Disable Time
(Note 9)
Output Disable Time
(Note 9)
Output Enable Time
Output Enable Time
C
L
= 50 pF, R
L
= 200Ω,
S1 Closed, S2 Closed
C
L
= 50 pF, R
L
= 200Ω,
S1 Closed, S2 Closed
C
L
= 50 pF, R
L
=
∞
,
S1 Open, S2 Closed
C
L
= 50 pF, R
L
= 200Ω,
S1 Closed, S2 Open
14
21
15
25
11
19
11
25
7
10
15
25
8
11
17
25
1.5
4
2.0
7
10
15
Conditions
DS34C87
Typ
6
Max
10
DS3487
Typ
10
Max
15
11)
Units
ns
ns
ns
ns
ns
ns
ns
Note 11:
This table is provided for comparison purposes only. The values in this table for the DS34C87 reflect the performance of the device but are not tested or
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