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DS8641
Quad Unified Bus Transceiver
DS8641 Quad Unified Bus Transceiver
January 1996
General Description
The DS8641 is a quad high speed drivers/receivers designed for use in bus organized data transmission systems
interconnected by terminated 120Ω impedance lines. The
external termination is intended to be a 180Ω resistor from
the busto the +5V logic supply together with a 390Ω resistor
from thebus toground. The bus canbe terminatedat oneor
both ends. Low bus pin current allows up to 27 driver/
receiver pairs to utilize a common bus. The bus loading is
unchanged when V
thresholds for betterbus noise immunity. One two-inputNOR
gate is included to disable all drivers in a package simultaneously.
=
0V. The receivers incorporate tight
CC
Connection Diagram
Dual-In-Line Package
Features
n 4 separate driver/receiver pairs per package
n Guaranteed minimum bus noise immunity of 0.6V, 1.1V
typ
n Temperature insensitive receiver thresholds track bus
logic levels
n 30 µA typical bus terminal current with normal V
n Open collector driver output allows wire-OR connection
n High speed
n Series 74 TTL compatible driver and disable inputs and
=
with V
receiver outputs
0V
CC
or
CC
DS005806-1
Top View
Order Number DS8641N
See NS Package Number N16A
© 1999 National Semiconductor Corporation DS005806 www.national.com
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Typical Application
DS005806-2
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National SemiconductorSales Office/
Distributors for availability and specifications.
Supply Voltage 7V
Input and Output Voltage 5.5V
Storage Temperature Range −65˚C to +150˚C
Maximum Power Dissipation (Note 1) at 25˚C
Cavity Package 1433 mW
Lead Temperature (Soldering, 4 seconds) 260˚C
Operating Conditions
Supply Voltage, (V
)
CC
DS8641 4.75 5.25 V
Temperature Range, (T
A
DS8641 0 +70 ˚C
Note 1: Derate molded package 10.9 mW/˚C above 25˚C.
Min Max Units
)
Molded Package 1362 mW
Electrical Characteristics
The following apply for V
Symbol Parameter Conditions Min Typ Max Units
DRIVER AND DISABLE INPUTS
V
V
I
I
I
V
Logical “1” Input Voltage 2.0 V
IH
Logical “0” Input Voltage 0.8 V
IL
Logical “1” Input Current V
I
Logical “1” Input Current V
IH
Logical “0” Input Current V
IL
Input Diode Clamp Voltage I
CL
DRIVER OUTPUT/RECEIVER INPUT
V
I
I
V
V
Low Level Bus Voltage V
OLB
Maximum Bus Current V
IHB
Maximum Bus Current V
ILB
High Level Receiver Threshold V
IH
Low Level Receiver Threshold V
IL
RECEIVER OUTPUT
V
V
I
I
Logical “1” Output Voltage V
OH
Logical “0” Output Voltage V
OL
Output Short Circuit Current V
OS
Supply Current V
CC
MIN
≤ VCC≤ V
MAX,TMIN
IN
IN
IN
DIS
T
A
DIS
IN
IN
IND
IND
IN
IN
DIS
V
CC
DIS
≤ TA≤ T
=
5.5V 1 mA
=
2.4V 40 µA
=
0.4V −1.6 mA
=
−12 mA, I
=
25˚C
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
0.8V, V
=
V
MAX
=
0V, V
unless otherwise specified (Note 3) and (Note 4)
MAX
=
−12 mA, I
IN
=
2V, I
IN
BUS
BUS
OL
OH
BUS
BUS
IN
BUS
=
4V, V
CC
=
4V, V
CC
=
16 mA 1.70 1.50 V
=
−400 µA 1.50 1.30 V
=
0.5V, I
=
4V, I
OL
=
0.8V, V
=
−12 mA, −1 −1.5 V
BUS
=
50 mA 0.4 0.7 V
=
V
MAX
=
0V 2 100 µA
=
−400 µA 2.4 V
OH
=
16 mA 0.25 0.4 V
BUS
=
0.5V, V
=
0V, −18 −55 mA
OS
30 100 µA
, (Note 5)
=
2V, (per Package) 50 70 mA
IN
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Switching Characteristics
=
T
25˚C, V
A
Symbol Parameter Conditions Min Typ Max Units
t
PD
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 table of “Electrical Characteristics” provides conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS8641.All typical values are for T
Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.
Note 5: Only one output at a time should be shorted.
Note 6: 91Ω from bus pin to V
Note 7: Fan-out of 10 load, C
Note 8: The following apply for V
=
5V, unless otherwise indicated
CC
Propagation Delays (Note 8) (Note 6)
Disable to Bus “1” 19 30 ns
Disable to Bus “0” 15 30 ns
Driver Input to Bus “1” 17 25 ns
Driver Input to Bus “0” 17 25 ns
Bus to Logical “1” Receiver Output (Note 7) 20 30 ns
Bus to Logical “0” Receiver Output 18 30 ns
=
25˚C and V
A
and 200Ω from bus pin to ground. C
CC
=
15 pF total. Measured from V
LOAD
=
=
5V, T
CC
25˚C unless otherwise specified.
A
=
15 pF total. Measured from V
LOAD
=
1.5V to V
IN
OUT
=
1.5V, V
=
IN
=
IN
0V to 3V pulse.
1.5V to V
BUS
=
1.5V, V
=
0V to 3V pulse.
IN
=
5V.
CC
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Physical Dimensions inches (millimeters) unless otherwise noted
Molded Dual-In-Line Package (N)
Order Number DS8641N
NS Package Number N16A
DS8641 Quad Unified Bus Transceiver
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www.national.com
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