DS26S10
Quad Bus Transceiver
General Description
The DS26S10 is a quad Bus Transceiver consisting of 4 high
speed bus drivers with open-collector outputs capable of
sinking 100 mA at 0.8V and 4 high speed bus receivers.
Each driver output is connected internally to the high speed
bus receiver in addition to being connected to the package
pin. The receiver has a Schottky TTL output capable of driv-
ing 10 Schottky TTL unit loads.
An active low enable gate controls the 4 drivers so that out-
puts of different device drivers can be connected together for
party-line operation.
The bus output high-drive capability in the low state allows
party-line operation with a line impedance as low as 100
.
The line can be terminated at both ends, and still give con-
siderable noise margin at the receiver. The receiver typical
switching point is 2V.
The DS26S10 features advanced Schottky processing to
minimize propagation delay. The device package also has 2
ground pins to improve ground current handling and allow
close decoupling between V
CC
and ground at the package.
Both GND 1 and GND 2 should be tied to the ground bus ex-
ternal to the device package.
Features
n
Input to bus is inverting on DS26S10
n
Quad high speed open-collector bus transceivers
n
Driver outputs can sink 100 mA at 0.8V maximum
n
Advanced Schottky processing
n
PNP inputs to reduce input loading
Logic Diagrams
DS2610
DS005802-1
May 1999
DS26S10
Quad
Bus
T
ransceiver
1999 National Semiconductor Corporation
DS005802
www.national.com
Absolute Maximum Ratings
(Note *NO
TARGET FOR FNXref NS859*)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature
-65C to +150C
Temperature (Ambient) Under Bias
-55C to +125C
Supply Voltage to Ground Potential
-0.5V to +7V
DC Voltage Applied to Outputs for
-0.5V to +V
CC
Max
High Output State
DC Input Voltage
-0.5V to +5.5V
Output Current, Into Bus
200 mA
Output Current, Into Outputs
(Except Bus)
30 mA
DC Input Current
-30 mA to +5 mA
Maximum Power Dissipation (Note 1) at 25C
Molded Package
1362 mW
Operating Conditions
Min
Max
Units
Supply Voltage (V
CC
)
DS26S10
4.75
5.25
V
Temperature (T
A
)
DS26S10
0
+70
C
Note 1: Derate cavity package 9.6 mW/C above 25C; derate molded pack-
age 10.9 mW/C above 25C, derate PLCC package TBD mW/C above
25C.
Electrical Characteristics
(Unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
(Note 3)
V
OH
Output High Voltage
V
CC
= Min, I
OH
= -1 mA,
Military
2.5
3.4
V
(Receiver Outputs)
V
IN
= V
IL
or V
IH
Commercial
2.7
3.4
V
V
OL
Output Low Voltage
V
CC
= Min, I
OL
= 20 mA,
0.5
V
(Receiver Outputs)
V
IN
= V
IL
or V
IH
V
IH
Input High Level
Guaranteed Input Logical High for
2.0
V
(Except Bus)
All Inputs
V
IL
Input Low Level
Guaranteed Input Logical Low for
0.8
V
(Except Bus)
All Inputs
V
I
Input Clamp Voltage
V
CC
= Min, I
IN
= -18 mA
-1.2
V
(Except Bus)
I
IL
Input Low Current
V
CC
= Max, V
IN
= 0.4V
Enable
-0.36
mA
(Except Bus)
Data
-0.54
mA
I
IH
Input High Current
V
CC
= Max, V
IN
= 2.7V
Enable
20
A
(Except Bus)
Data
30
A
I
I
Input High Current
V
CC
= Max, V
IN
= 5.5V
100
A
(Except Bus)
I
SC
Output Short-Circuit Current
V
CC
= Max, (Note 4)
Military
-20
-55
mA
(Except Bus)
Commercial
-18
-60
mA
I
CCL
Power Supply Current
V
CC
= Max, Enable = GND
DS26S10
45
70
mA
(All Bus Outputs Low)
DS26S11
80
mA
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2
Connection Diagram
Dual-In-Line Package
DS005802-3
Top View
Order Number DS26S10N
See NS Package Number N16A
Plastic Chip Carrier
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3
Bus Input/Output Characteristics
Symbol
Parameter
Conditions
(Note 2)
Min
Typ(Note
3)
Max
Units
V
OL
Output Low Voltage
V
CC
= Min
I
OL
= 40 mA
0.33
0.5
V
I
OL
= 70 mA
0.42
0.05
I
OL
= 100 mA
0.51
0.8
I
O
Bus Leakage Current
V
CC
= Max
V
O
= 0.8V
-50
A
V
O
= 4.5V
100
I
OFF
Bus Leakage Currrent (power
OFF)
V
O
= 4.5V
100
A
V
TH
Receiver Input High Threshold
Bus enable = 2.4V
V
CC
= Max
2.25
2.0
V
V
TL
Receiver Input Low Threshold
Bus enable = 2.4V
V
CC
= Min
2.0
1.75
Note 2: For conditions shown as min or max, use the appropriate value specified under Electrical Characteristics for the applicable device type.
Note 3: Typical limits are at V
CC
= 5V, 25C ambient and maximum loading.
Note 4: Not more than one output should be shorted at a time. Duration of the short circuit test should not exceed one second.
Switching Characteristics
(T
A
= 25C, V
CC
= 5V)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
PLH
Data Input to Bus
R
B
= 50
, C
B
= 50 pF (Note 5)
DS26S10
10
15
ns
t
PHL
Data Input to Bus
10
15
ns
t
PLH
Enable Input to Bus
DS26S10
14
18
ns
t
PHL
Enable Input to Bus
13
18
ns
t
PLH
Bus to Receiver Out
R
B
= 50
, R
L
= 280
, C
B
= 50 pF(Note 5)
10
15
ns
t
PHL
Bus to Receiver Out
C
L
= 15 pF
10
15
ns
t
r
Bus
R
B
= 50
, C
B
= 50 pF (Note 5)
4.0
10
ns
t
f
Bus
2.0
4.0
ns
Note 5: Includes probe and jig capacitance.
Truth Tables
DS26S10
Inputs
Outputs
E
I
B
Z
L
L
H
L
L
H
L
H
H
X
Y
Y
H = High voltage level
L = Low voltage level
X = Don't care
Y = Voltage level of bus (assumes control by another bus transceiver)
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Typical Application
AC Test Circuit and Switching Time Waveforms
DS005802-5
DS005802-6
Note 1: Includes probe and jig capacitance.
DS005802-7
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5
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