Page 1
DS36277
Dominant Mode Multipoint Transceiver
General Description
The DS36277 Dominant Mode Multipoint Transceiver is designed for use on bi-directional differential busses. It is optimal for use on Interfaces that utilize Society of Automotive
Engineers (SAE) J1708 Electrical Standard.
The device is similar to standard TIA/EIA-485 transceivers,
but differs in enabling scheme. The Driver’s Input is normally
externally tied LOW, thus providing only two states: Active
(LOW), or Disabled (OFF). When the driver is active, the
dominant mode is LOW, conversely, when the driver is disabled, the bus is pulled HIGH by external bias resistors.
The receiver provides a FAILSAFEfeaturethat guarantees a
known output state when the Interface is in the following conditions: Floating Line, Idle Line (no active drivers), and Line
Fault Conditions (open or short). The receiver output is
HIGH for the following conditions: Open Inputs, Terminated
Inputs (50Ω), or Shorted Inputs. FAILSAFE is a highly desirable feature when the transceivers are used with Asynchronous Controllers such as UARTs.
Features
n FAILSAFE receiver, RO = HIGH for:
— OPEN inputs
— Terminated inputs
— SHORTED inputs
n Optimal for use in SAE J1708 Interfaces
n Compatible with popular interface standards:
— TIA/EIA-485 and TIA/EIA-422-A
— CCITT recommendation V.11
n Bi-directional transceiver
— Designed for multipoint transmission
n Wide bus common mode range
— (−7V to +12V)
n Available in plastic DIP and SOIC packages
Connection and Logic Diagram Truth Tables
Driver
Inputs Outputs
DE
DI DO/RI DO /RI
LL L H
LH H L
HX Z Z
Receiver
Inputs Output
RE
DO/RI–DO /RI RO
L ≥ 0mV H
L ≤−500 mV L
L SHORTED H
L OPEN H
HX Z
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS011384-1
Order Number DS36277TM or DS36277TN
See NS Package Number M08A or N08E
July 1998
DS36277 Dominant Mode Multipoint Transceiver
© 1999 National Semiconductor Corporation DS011384 www.national.com
Page 2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)7V
Input Voltage (DE , RE , and DI)
5.5V
Driver Output Voltage/
Receiver Input Voltage −10V to +15V
Receiver Output Voltage (RO) 5.5V
Maximum Package Power Dissipation
@
+25˚C
N Package
(derate 9.3 mW/˚C above +25˚C) 1168 mW
M Package
(derate 5.8 mW/˚C above +25˚C) 726 mW
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering 4 sec.) 260˚C
ESD Rating (HBM, 1.5 kΩ, 100 pF) ≥ 6.0 kV
Recommended Operating
Conditions
Min Max Units
Supply Voltage, V
CC
4.75 5.25 V
Bus Voltage −7 +12 V
Operating Temperature (T
A
)
DS36277T −40 +85 ˚C
Electrical Characteristics (Notes 2, 4)
Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DRIVER CHARACTERISTICS
V
OD
Differential Output Voltage IO= 0 mA (No Load) 1.5 3.6 6 V
V
oDO
Output Voltage IO= 0 mA (Output to GND) 0 6 V
V
oDO
Output Voltage 0 6 V
V
T1
Differential Output Voltage
(Termination Load)
RL=54Ω(485) (
Figure 1
) 1.3 2.2 5.0 V
R
L
= 100Ω (422) 1.7 2.6 5.0 V
∆V
T1
Balance of V
T1
RL=54Ω (Note 3) −0.2 0.2 V
|V
T1−VT1
| RL= 100Ω −0.2 0.2 V
V
OS
Driver Common Mode
Output Voltage
RL=54Ω (
Figure 1
) 0 2.5 3.0 V
R
L
= 100Ω 0 2.5 3.0 V
∆V
OS
Balance of V
OS
RL=54Ω (Note 3) −0.2 0.2 V
|V
OS−VOS
| RL= 100Ω −0.2 0.2 V
V
OH
Output Voltage High IOH= −22 mA (
Figure 2
) 2.7 3.7 V
V
OL
Output Voltage Low IOL= +22 mA 1.3 2 V
I
OSD
Driver Short-Circuit
Output Current
VO= +12V (
Figure 3
) 92 290 mA
V
O
= −7V −187 −290 mA
RECEIVER CHARACTERISTICS
V
TH
Differential Input High
Threshold Voltage (Note 5)
VO=VOH,IO= −0.4 mA −0.150 0 V
−7V ≤ V
CM
≤ +12V
V
TL
Differential Input Low
Threshold Voltage (Note 5)
VO=VOL,IO= 8.0 mA −0.5 −0.230 V
−7V ≤ V
CM
≤ +12V
V
HST
Hysteresis (Note 6) VCM=0V 80 mV
I
IN
Line Input Current
(V
CC
= 4.75V, 5.25V, 0V)
Other Input = 0V V
I
= +12V 0.5 1.5 mA
DE=V
IH
(Note 7) VI= −7V −0.5 −1.5 mA
I
OSR
Short Circuit Current VO= 0V RO −15 −32 −85 mA
I
OZ
TRI-STATE®Leakage Current VO= 0.4 to 2.4V −20 1.4 +20 µA
V
OH
Output High Voltage
(
Figure 12
)
V
ID
= 0V, IOH= −0.4 mA 2.3 3.7 V
V
ID
= OPEN, IOH= −0.4 mA 2.3 3.7 V
V
OL
Output Low Voltage
(
Figure 12
)
V
ID
= −0.5V, IOL= +8 mA 0.3 0.7 V
V
ID
= −0.5V, IOL= +16 mA 0.3 0.8 V
R
IN
Input Resistance 10 20 kΩ
www.national.com 2
Page 3
Electrical Characteristics (Notes 2, 4) (Continued)
Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DEVICE CHARACTERISTICS
V
IH
High Level Input Voltage DE ,
RE ,
or
DI
2.0 V
CC
V
V
IL
Low Level Input Voltage GND 0.8 V
I
IH
High Level Input Current VIH= 2.4V 20 µA
I
IL
Low Level Input Current VIL= 0.4V −100 µA
V
CL
Input Clamp Voltage ICL= −18 mA −0.7 −1.5 V
I
CC
Output Low Voltage DE = 0V, RE = 0V, DI = 0V 39 60 mA
I
CCR
Supply Current DE = 3V, RE = 0V, DI = 0V 24 50 mA
I
CCD
(No Load) DE = 0V, RE = 3V, DI = 0V 40 75 mA
I
CCX
DE = 3V, RE = 3V, DI = 0V 27 45 mA
Switching Characteristics (Note 4)
Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DRIVER CHARACTERISTICS
t
PLHD
Diff. Prop. Delay Low to High RL=54Ω 81760 ns
t
PHLD
Diff. Prop. Delay High to Low CL= 50 pF 8 19 60 ns
t
SKD
Diff. Skew (|t
PLHD–tPHLD
|) CD=50pF 2 10 ns
t
r
Diff. Rise Time (
Figures 4, 5
)1160ns
t
f
Diff. Fall Time 11 60 ns
t
PLH
Prop. Delay Low to High RL=27Ω,CL=15pF 22 85 ns
t
PHL
Prop. Delay High to Low (
Figures 6, 7
)2585ns
t
PZH
Enable Time Z to High RL= 110Ω 25 60 ns
t
PZL
Enable Time Z to Low CL=50pF 30 60 ns
t
PHZ
Disable Time High to Z (
Figure 8–Figure 11
)1660ns
t
PLZ
Disable Time Low to Z 11 60 ns
RECEIVER CHARACTERISTICS
t
PLH
Prop. Delay Low to High VID= −1.5V to +1.5V 15 37 90 ns
t
PHL
Prop. Delay High to Low CL=15pF 15 43 90 ns
t
SK
Skew (|t
PLH–tPHL
|) (
Figures 13, 14
) 6 15 ns
t
PZH
Enable Time Z to High CL=15pF 12 60 ns
t
PZL
Enable Time Z to Low (
Figures 15, 16
)2860ns
t
PHZ
Disable Time High to Z 20 60 ns
t
PLZ
Disable Time Low to Z 10 60 ns
Note 1: “AbsoluteMaximum 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 tables of “Electrical Characteristics” specify conditions for device operation.
Note 2: Currentinto device pins is definedaspositive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified.
Note 3: ∆ |V
T1
| and ∆ |VOS| are changes in magnitude of VT1and VOS, respectively, that occur when the input changes state.
Note 4: All typicals are given for V
CC
= 5.0V and TA= +25˚C.
Note 5: Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 6: Hysteresis defined as V
HST=VTH−VTL
.
Note 7: I
IN
includes the receiver input current and driver TRI-STATE leakage current.
www.national.com3
Page 4
Parameter Measurement Information
DS011384-2
FIGURE 1. Driver VT1and VOSTest Circuit
DS011384-3
FIGURE 2. Driver VOHand VOLTest Circuit
DS011384-4
FIGURE 3. Driver Short Circuit Test Circuit
DS011384-5
FIGURE 4. Driver Differential Propagation Delay and Transition Time Test Circuit
www.national.com 4
Page 5
Parameter Measurement Information (Continued)
DS011384-6
FIGURE 5. Driver Differential Propagation Delays and Transition Times
DS011384-7
FIGURE 6. Driver Propagation Delay Test Circuit
DS011384-8
FIGURE 7. Driver Propagation Delays
DS011384-9
S1 to DO for DI = 3V
S1 to DO for DI = 0V
FIGURE 8. Driver TRl-STATE Test Circuit (t
PZH,tPHZ
)
www.national.com5
Page 6
Parameter Measurement Information (Continued)
DS011384-10
FIGURE 9. Driver TRI-STATE Delays (t
PZH,tPHZ
)
DS011384-11
S1 to DO for DI = 0V
S1 to DO for DI = 3V
FIGURE 10. Driver TRI-STATE Test Circuit (t
PZL,tPLZ
)
DS011384-12
FIGURE 11. Driver TRl-STATE Delays (t
PZL,tPLZ
)
DS011384-13
FIGURE 12. Receiver VOHand V
OL
DS011384-14
FIGURE 13. Receiver Propagation Delay Test Circuit
www.national.com 6
Page 7
Parameter Measurement Information (Continued)
Note 8: The input pulse is supplied by a generator having the following characteristics: f = 1.0 MHz, 50%duty cycle, trand t
f
<
6.0 ns, ZO=50Ω.
Note 9: C
L
includes probe and stray capacitance.
Note 10: Diodes are 1N916 or equivalent.
DS011384-15
FIGURE 14. Receiver Propagation Delays
DS011384-16
FIGURE 15. Receiver TRI-STATE Delay Test Circuit
DS011384-17
S1 1.5V
S2 OPEN
S3 CLOSED
DS011384-19
S1 1.5V
S2 CLOSED
S3 CLOSED
DS011384-18
S1 −1.5V
S2 CLOSED
S3 OPEN
DS011384-20
S1 −1.5V
S2 CLOSED
S3 CLOSED
FIGURE 16. Receiver Enable and Disable Timing
www.national.com7
Page 8
Typical Performance Characteristics
Differential Output Voltage
vs Output Current
DS011384-22
Differential Output Voltage
vs Output Current
DS011384-23
Driver VOHvs IOHvs V
CC
DS011384-24
Driver VOHvs IOHvs Temperature
DS011384-25
Driver VOLvs IOLvs V
CC
DS011384-26
Driver VOLvs IOLvs Temperature
DS011384-27
www.national.com 8
Page 9
Typical Performance Characteristics (Continued)
Receiver V
OH
vs IOHvs V
CC
DS011384-28
Receiver VOHvs IOHvs Temperature
DS011384-29
Receiver VOLvs IOLvs V
CC
DS011384-30
Receiver VOLvs IOLvs Temperature
DS011384-31
Supply Current vs Supply Voltage
DS011384-32
Supply Current vs Temperature
DS011384-33
www.national.com9
Page 10
Typical Performance Characteristics (Continued)
Typical Applications Information
Voltage Output vs Voltage Input (Hysteresis)
DS011384-34
SAE J1708 Node with External Bias Resistors and Filters
DS011384-21
www.national.com 10
Page 11
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Molded Package (SO)
Order Number DS36277TM
NS Package Number M08A
8-Lead Molded Dual-In-Line Package (N)
Order Number DS36277TN
NS Package Number N08E
www.national.com11
Page 12
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49(0) 1 80-532 93 58
Italiano Tel: +49(0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: sea.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
DS36277 Dominant Mode Multipoint Transceiver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Loading...