NSC DS3890 Octal trapezoidal driver / octal tri-state receiver Datasheet

DS3890 BTL Octal Trapezoidal Driver
DS3892 BTL Octal TRI-STATEÉ Receiver
General Description
The DS3890 and DS3898 are designed specifically to overcome problems associated with driving densely populated
backplanes. These products provide significant improvement in both speed and data integrity in comparison to conventional bus drivers and receivers. Their low output capacitance, low voltage swing and noise immunity features make
them ideal for driving low impedance busses with minimum
power dissipation.
The DS3890 features an open collector outputs that generate precise trapezoidal waveforms with typical rise and fall
times of 6 ns which are relatively independent of capacitive
loading conditions. These controlled output characteristics
significantly reduce noise coupling to adjacent lines.
To minimize bus loading, the DS3890 also features a
schottky diode in series with the open collector outputs that
isolates the driver output capacitance in the disabled state.
With this type of configuration the output low voltage is typically ‘‘1V’’. The output high level is intended to be 2 volts.
This is achieved by terminating the bus with a pull up resistor. Both devices can drive an equivalent DC load of 18.5X
(or greater) in the defined configuration.
(General Description to be continued)
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Driver output capacitance less than 5 pF
1 volt bus signal reduces power consumption
Trapezoidal driver waveforms (tr, tf, typically 6 ns) reduces noise coupling to adjacent lines
Precise receiver threshold track the bus logic high level
to maximize noise immunity in both logic high ahd low
states
Open collector driver output allows wire-or connection
Advanced low power schottky technology
Glitch free power up/down protection
TTL compatible driver and control inputs and receiver
output
BTL compatible
Logic and Connection Diagrams
DS3890 Octal Trapezoidal Driver
DS3892 Octal TRI-STATE Receiver
TL/F/8700 – 1
TL/F/8700 – 2
Order Numbers DS3892M, DS3890N or DS3892N
See NS Package Number M20B or N20A
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation
TL/F/8700
RRD-B30M36/Printed in U. S. A.
http://www.national.com
DS3890 BTL Octal Trapezoidal Driver/DS3892 BTL Octal TRI-STATE Receiver
January 1996
Absolute Maximum Ratings (Note 1)
Recommended Operating
Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
Control Input Voltage
Driver Input and Receiver Output
Receiver Input and Driver Output
Storage Temperature Range
Lead Temperature (Soldering, 4 sec.)
Supply Voltage
Temperature (TA)
6V
5.5V
5.5V
2.5V
b 65§ C to a 165§ C
260§ C
Min
4.75
0
Max
5.25
70
Units
V
§C
DS3890 Electrical Characteristics (Notes 2 and 3)
DRIVER AND CONTROL INPUTS
Symbol
Conditions
Min
VIH
Typ
Max
Units
0.8
V
2.0
V
VIL
IIL An
VCC e Max
VIN e 0.4V
b1
b 1.6
mA
IIL Dis
VCC e Max
VIN e 0.4V
b 180
b 400
mA
IIH
VCC e Max
VIN e 2.4V
40
mA
II
VCC e Max
VIN e 5.25V
1
mA
VCL
VCC e Min
IIN eb12 mA
b 1.5
V
VOL
VCC e Min
RL e 18.5X
0.75
1.0
1.2
V
IOH
VCC e Max
VOUT e 2V
b 20
10
100
mA
IO
VCC e 0V
100
mA
IIL
VCC e Max
b 100
b 250
mA
b 0.9
DRIVER OUTPUT
ICC Low
ICC High
VOUT e 2V
VOUT e 0.75V
50
VCC e Max
80
mA
100
mA
Max
Units
0.8
V
b 400
mA
DS3892 Electrical Characteristics (Notes 2 and 3)
CONTROL INPUTS
Symbol
Conditions
Min
VIH
Typ
2.0
V
VIL
IIL
VCC e Max
VIN e 0.4V
IIH
VCC e Max
VIN e 2.4V
b 180
40
mA
II
VCC e Max
VIN e 5.25V
1
mA
VCL
VCC e Min
IIN eb12 mA
b 0.9
b 1.5
V
VOL
VCC e Min
IOL e 16 mA
0.35
0.5
VOH
VCC e Min
IOH eb400 mA
IOS
VCC e Max
VOUT e 0V
VTH Rec
VCC e 5V
IIH Rec
VCC e Max
II Rec
VCC e 0V
IIL Rec
VCC e Max
RECEIVER
ICC Low
ICC High
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VIN e 2V
VIN e 2V
VIN e 0.75V
VCC e Max
2
V
2.4
3.2
V
b 20
b 70
b 100
1.47
1.55
1.62
V
10
100
mA
100
mA
mA
100
mA
80
mA
60
mA
DS3890 Switching Characteristics (Figure 1)
0§ CsTAs70§ C, 4.75VsVCCs5.25V unless otherwise specified
Symbol
Typ
Max
9
15
ns
9
15
ns
10
18
ns
12
20
ns
6
10
ns
Typ
Max
Units
12
18
ns
TpHL
10
18
ns
TdLZ
10
18
ns
TdZL
8
15
ns
TdHZ
4
8
ns
TdZH
7
12
ns
TdLH
Conditions
Min
An to Bn
TdHL
TdLH
Dis to Bn
TdHL
Tr & Tf
Bn rise and fall time
3
Units
DS3892 Switching Characteristics (Figures 2, 3 and 4 )
Symbol
TdLH
TNR
Conditions
Min
Bn to An
Dis to An
Receiver noise rejection
3
6
ns
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’’ provides conditions for actual device operation.
Note 2: All currents into device pins are shown as positive values; all currents out of the device are shown as negative; all voltages are referenced to ground unless
otherwise specified. All values shown as max or min are classified on absolute value basis and apply to the full operating temperature and VCC range.
Note 3: All typical values are VCC e 5V, TA e 25§ C.
3
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General Descriptions (Continued)
The DS3892 receiver inputs incorporate a low pass filter in
conjunction with high speed comparator to further enhance
the noise immunity. Both devices provide equal rejection to
both positive and negative noise pulses (typically 6 ns) on
the bus.
The DS3890 features TTL compatible inputs while the
DS3892 inputs are BTL compatible. The control inputs on all
devices are TTL compatible.
BTL ‘‘Backplane Transceiver Logic’’ is a new logic signaling
method developed by IEEE P896 Future Bus Stan-
dards Committee. This standard was adopted to enhance
the performance of Backplane Busses. BTL compatible bus
interface circuits feature low capacitance drivers to minimize bus loading, a 1V nominal signal swing for reduced
power consumption and receivers with precision thresholds
for maximum noise immunity. This new standard overcomes
some of the fundamental limitations of TTL bus transceivers
in heavily loaded backplane bus applications. Devices designed to this standard provide significant improvements in
switching speed and data integrity.
AC Switching Waveforms
TL/F/8700 – 4
Note: tR e tF k 10 ns from 10% to 90%
TL/F/8700 – 5
FIGURE 1
Driver Propagation Delays
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4
AC Switching Waveforms (Continued)
TL/F/8700 – 6
Note: tR e tF k 10 ns from 10% to 90%
TL/F/8700 – 7
FIGURE 2. Receiver Propagation Delays
TL/F/8700 – 8
tDLZ
tDZL
TL/F/8700 – 14
Note: tR e tF k 5 ns from 10% to 90%
tDHZ
Note: tR e tF k 5 ns from 10% to 90%
TL/F/8700 – 9
tDZH
TL/F/8700 – 15
TL/F/8700 – 16
FIGURE 3. Propagation Delay from Disable Pin to An
5
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AC Switching Waveforms (Continued)
TL/F/8700 – 10
High
Low
Note: tR e tF k 2 ns from 10% to 90%
TL/F/8700 – 11
FIGURE 4
Receiver Noise Immunity:
‘‘No Response at Output’’ Input Waveforms
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6
Physical Dimensions inches (millimeters)
Order Number DS3892M
NS Package Number M20B
7
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DS3890 BTL Octal Trapezoidal Driver/DS3892 BTL Octal TRI-STATE Receiver
Physical Dimensions inches (millimeters) (Continued)
Order Numbers DS3890N or DS3892N
NS Package Number N20A
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