DS36C278_14 [TI]

DS36C278 Low Power Multipoint EIA-RS-485 Transceiver;
DS36C278_14
型号: DS36C278_14
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

DS36C278 Low Power Multipoint EIA-RS-485 Transceiver

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DS36C278  
www.ti.com  
SNLS096C JULY 1998REVISED APRIL 2013  
DS36C278 Low Power Multipoint EIA-RS-485 Transceiver  
Check for Samples: DS36C278  
1
FEATURES  
DESCRIPTION  
The DS36C278 is a low power differential bus/line  
transceiver designed to meet the requirements of RS-  
485 standard for multipoint data transmission. In  
addition it is compatible with TIA/EIA-422-B.  
2
100% RS-485 Compliant  
Guaranteed RS-485 Device Interoperation  
Low Power CMOS Design: ICC 500 μA Max  
Built-In Power Up/Down Glitch-Free Circuitry  
The CMOS design offers significant power savings  
over its bipolar and ALS counterparts without  
sacrificing ruggedness against ESD damage. The  
device is ideal for use in battery powered or power  
conscious applications. ICC is specified at 500 μA  
maximum.  
Permits Live Transceiver  
Insertion/Displacement  
PDIP and SOIC Packages Available  
Industrial Temperature Range: 40°C to  
+85°C  
The driver and receiver outputs feature TRI-STATE  
capability. The driver outputs operate over the entire  
common mode range of 7V to +12V. Bus contention  
or fault situations that cause excessive power  
dissipation within the device are handled by a thermal  
shutdown circuit, which forces the driver outputs into  
the high impedance state.  
On-Board Thermal Shutdown Circuitry  
Prevents Damage to the Device in the Event  
of Excessive Power Dissipation  
Wide Common Mode Range: 7V to +12V  
(1)  
Receiver Open Input Fail-Safe  
¼ Unit Load (DS36C278): 12 Nodes  
½ Unit Load (DS36C278T): 64 Nodes  
ESD (Human Body Model): 2 kV  
Drop in Replacement for:  
The receiver incorporates a fail safe circuit which  
guarantees a high output state when the inputs are  
(1)  
left open.  
The DS36C278T is fully specified over the industrial  
LTC485, MAX485, DS75176, DS3695  
temperature range (40°C to +85°C).  
(1) Non-terminated, open input only  
Connection Diagram  
Figure 1. 8-Pin PDIP or SOIC  
Package Numbers D0008A and P0008E  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1998–2013, Texas Instruments Incorporated  
DS36C278  
SNLS096C JULY 1998REVISED APRIL 2013  
www.ti.com  
Pin Descriptions  
Pin No. Name  
Description  
1
RO  
Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI DO*/RI* by 200 mV, RO  
will be HIGH. If DO/RI DO*/RI* by 200 mV, RO will be LOW. Additionally RO will be HIGH for OPEN (Non-terminated)  
Inputs.  
2
3
4
RE*  
DE  
DI  
Receiver Output Enable: When RE* is LOW the receiver output is enabled. When RE* is HIGH, the receiver output is in  
TRI-STATE (OFF).  
Driver Output Enable: When DE is HIGH, the driver outputs are enabled. When DE is LOW, the driver outputs are in  
TRI-STATE (OFF).  
Driver Input: When DE (Driver Enable) is HIGH, the driver is enabled, if DI is LOW, then DO/RI will be LOW and  
DO*/RI* will be HIGH. If DI is HIGH, then DO/RI is HIGH and DO*/RI* is LOW.  
5
6
7
8
GND Ground Connection.  
DO/RI Driver Output/Receiver Input, 485 Bus Pin.  
DO*/RI* Driver Output/Receiver Input, 485 Bus Pin.  
VCC  
Positive Power Supply Connection: Recommended operating range for VCC is +4.75V to +5.25V.  
Table 1. Truth Table(1)  
DRIVER SECTION  
RE*  
DE  
H
DI  
H
L
DO/RI  
DO*/RI*  
X
H
L
L
H
Z
X
H
X
L
X
Z
RECEIVER SECTION  
RE*  
L
DE  
L
RI-RI*  
+0.2V  
≤−0.2V  
X
RO  
H
L
L
L
H
L
Z
(1)  
L
L
OPEN  
H
(1) Non-terminated, open input only  
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam  
during storage or handling to prevent electrostatic damage to the MOS gates.  
Absolute Maximum Ratings(1)(2)  
Supply Voltage (VCC  
Input Voltage (DE, RE*, & DI)  
Common Mode (VCM  
)
+12V  
0.5V to (VCC +0.5V)  
)
Driver Output/Receiver Input  
Input Voltage (DO/RI, DO*/RI*)  
Receiver Output Voltage  
±15V  
±14V  
0.5V to (VCC +0.5V)  
Maximum Package Power Dissipation  
@ +25°C  
D0008A Package 1190 mW, derate  
P0008E Package 744 mW, derate  
Storage Temperature Range  
9.5 mW/°C above +25°C  
6.0 mW/°C above +25°C  
65°C to +150°C  
Lead Temperature  
(Soldering 4 sec)  
+260°C  
(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 devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device  
operation.  
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.  
2
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Copyright © 1998–2013, Texas Instruments Incorporated  
Product Folder Links: DS36C278  
DS36C278  
www.ti.com  
SNLS096C JULY 1998REVISED APRIL 2013  
Recommended Operating Conditions  
Min  
+4.75  
7  
Typ  
Max  
+5.25  
+12  
Units  
Supply Voltage (VCC  
)
+5.0  
V
V
Bus Voltage  
Operating Free-Air Temperature (TA)  
DS36C278T  
40  
25  
25  
+85  
+70  
°C  
°C  
DS36C278  
0
(1) (2)  
Electrical Characteristics  
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified  
Parameter  
Test Conditions  
Reference  
Min  
Typ  
Max  
Units  
DIFFERENTIAL DRIVER CHARACTERISTICS  
VOD1  
VOD0  
VOD0*  
VOD2  
Differential Output Voltage  
Output Voltage  
IO = 0 mA (No Load)  
1.5  
0
5.0  
5.0  
5.0  
V
V
V
V
V
V
(422)  
(485)  
IO = 0 mA  
Output Voltage  
(Output to GND)  
RL = 50Ω  
0
Differential Output Voltage  
(Termination Load)  
Balance of VOD2  
(422)  
(485)  
Figure 2  
2.0  
1.5  
0.2  
2.8  
2.3  
0.1  
RL = 27Ω  
5.0  
(3)  
ΔVOD2  
RL = 27Ω or 50Ω  
+0.2  
|VOD2 V0D2*  
|
(422, 485)  
Figure 3  
VOD3  
VOC  
Differential Output Voltage  
(Full Load)  
R1 = 54Ω, R2 = 375Ω  
VTEST = 7V to +12V  
1.5  
2.0  
5.0  
V
Driver Common Mode  
Output Voltage  
RL = 27Ω  
RL = 50Ω  
(485)  
(422)  
0
0
3.0  
3.0  
V
V
Figure 2  
(3)  
ΔVOC  
Balance of VOC  
RL = 27Ω or  
RL = 50Ω  
0.2  
+0.2  
V
|VOC VOC*  
|
(422, 485)  
(485)  
IOSD  
Driver Output Short-Circuit  
Current  
VO = +12V  
200  
+250  
mA  
mA  
VO = 7V  
(485)  
190  
250  
RECEIVER CHARACTERISTICS  
VTH  
Differential Input High  
Threshold Voltage  
VO = VOH, IO = 0.4V  
7V VCM +12V  
+0.035 +0.2  
0.2 0.035  
V
V
(4)  
(422, 485)  
VTL  
Differential Input Low  
Threshold Voltage  
VO = VOL, IO = 0.4 mA  
7V VCM +12V  
(5)  
VHST  
RIN  
RIN  
IIN  
Hysteresis  
VCM = 0V  
70  
mV  
kΩ  
Input Resistance  
Input Resistance  
7V VCM +12V  
7V VCM +12V  
Other Input = 0V,  
DE = VIL, RE* = VIL,  
VCC= 4.75 to 5.25  
or 0V  
DS36C278T  
DS36C278  
VIN = +12V  
VIN = 7V  
VIN = +12V  
VIN = 7V  
VIN = +12V  
VIN = 7V  
VIN = +12V  
VIN = 7V  
24  
48  
0
68  
68  
kΩ  
Line Input Current  
(6)  
DS36C278  
DS36C278T  
DS36C278  
DS36C278T  
0.19  
0.1  
0.19  
0.1  
0.19  
0.1  
0.19  
0.1  
0.25  
0.2  
0.5  
mA  
mA  
mA  
mA  
mA  
mA  
mA  
mA  
mV  
0
0
0
0.4  
0.25  
0.2  
0.5  
IING  
Line Input Current Glitch  
(6)  
Other Input = 0V,  
DE = VIL, RE* = VIL,  
VCC = +3.0V or 0V,  
TA = 25°C  
0
0
0
0
0.4  
±400  
(7)  
IB  
Input Balance Test  
RS = 500Ω  
(422)  
(1) Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground  
except VOD1 and VOD2  
.
(2) All typicals are given for: VCC = +5.0V, TA = + 25°C.  
(3) Delta |VOD2| and Delta |VOC| are changes in magnitude of VOD2 and VOC, respectively, that occur when input changes state.  
(4) Threshold parameter limits specified as an algebraic value rather than by magnitude.  
(5) Hysteresis defined as VHST = VTH VTL  
.
(6) IIN includes the receiver input current and driver TRI-STATE leakage current.  
(7) For complete details of test, see RS-485.  
Copyright © 1998–2013, Texas Instruments Incorporated  
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DS36C278  
SNLS096C JULY 1998REVISED APRIL 2013  
www.ti.com  
Electrical Characteristics (1) (2) (continued)  
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified  
Parameter  
Test Conditions  
IOH = 4 mA, VID = +0.2V  
IOL = +4 mA, VID = 0.2V  
VO = GND  
Reference  
Min  
Typ  
4.6  
0.3  
35  
Max  
Units  
V
VOH  
VOL  
IOSR  
IOZR  
High Level Output Voltage  
Low Level Output Voltage  
Short Circuit Current  
3.5  
RO  
Figure 12  
0.5  
85  
±1  
V
7
mA  
μA  
RO  
TRI-STATE Leakage Current  
VO = 0.4V to 2.4V  
DEVICE CHARACTERISTICS  
VIH  
VIL  
IIH  
High Level Input Voltage  
Low Level Input Voltage  
High Level Input Current  
Low Level Input Current  
2.0  
VCC  
0.8  
2
V
GND  
V
DE,  
RE*,  
DI  
VIH = VCC  
VCC = 5V  
μA  
μA  
μA  
μA  
μA  
μA  
μA  
IIL  
2  
VIL = 0V  
VCC = +3.0V  
2  
ICC  
Power Supply Current  
(No Load)  
Driver and Receiver ON  
Driver OFF, Receiver ON  
Driver ON, Receiver OFF  
Driver and Receiver OFF  
200  
200  
200  
200  
500  
500  
500  
500  
ICCR  
ICCD  
ICCZ  
VCC  
Switching Characteristics(1)(2)  
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified  
Parameter  
Test Conditions  
Reference  
Min  
Typ  
Max  
Units  
DRIVER CHARACTERISTICS  
tPHLD  
tPLHD  
tSKD  
Differential Propagation  
Delay High to Low  
RL = 54Ω, CL = 100 pF  
10  
10  
0
39  
40  
1
80  
80  
10  
ns  
ns  
ns  
Differential Propagation  
Delay Low to High  
Figure 7  
Differential Skew  
|tPHLD tPLHD  
Rise Time  
Fall Time  
|
tr  
3
25  
25  
80  
80  
50  
65  
50  
ns  
ns  
ns  
ns  
ns  
ns  
tf  
3
50  
tPHZ  
tPLZ  
tPZH  
tPZL  
Disable Time High to Z  
Disable Time Low to Z  
Enable Time Z to High  
Enable Time Z to Low  
CL = 15 pF  
RE * = L  
Figure 8, Figure 9  
Figure 10, Figure 11  
Figure 8, Figure 9  
Figure 10, Figure 11  
200  
200  
200  
200  
CL = 100 pF  
RE * = L  
RECEIVER CHARACTERISTICS  
tPHL  
Propagation Delay  
High to Low  
CL = 15 pF  
30  
30  
210  
190  
400  
400  
ns  
ns  
tPLH  
Propagation Delay  
Low to High  
Figure 13, Figure 14  
tSK  
Skew, |tPHL tPLH  
|
0
20  
50  
55  
40  
45  
50  
ns  
ns  
ns  
ns  
ns  
tPLZ  
tPHZ  
tPZL  
tPZH  
Output Disable Time  
CL = 15 pF  
150  
150  
150  
150  
Figure 15, Figure 16,  
Figure 17  
Output Enable Time  
(1) All typicals are given for: VCC = +5.0V, TA = + 25°C.  
(2) CL includes probe and jig capacitance.  
4
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Product Folder Links: DS36C278  
 
DS36C278  
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SNLS096C JULY 1998REVISED APRIL 2013  
PARAMETER MEASUREMENT INFORMATION  
Figure 2. Driver VOD2 and VOC  
Figure 3. Driver VOD3  
Figure 4. Driver VOH and VOL  
Vtest = 7V to +12V  
Figure 5. Driver IOSD  
Figure 6. Driver Differential Propagation Delay Test Circuit  
Copyright © 1998–2013, Texas Instruments Incorporated  
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DS36C278  
SNLS096C JULY 1998REVISED APRIL 2013  
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Figure 7. Driver Differential Propagation Delays and Differential Rise and Fall Times  
Figure 8. TRI-STATE Test Circuit (tPZH , tPHZ  
)
Figure 9. TRI-STATE Waveforms (tPZH, tPHZ  
)
Figure 10. TRI-STATE Test Circuit (tPZL, tPLZ  
)
6
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Copyright © 1998–2013, Texas Instruments Incorporated  
Product Folder Links: DS36C278  
DS36C278  
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SNLS096C JULY 1998REVISED APRIL 2013  
Figure 11. TRI-STATE Waveforms (tPZL, tPLZ  
)
Figure 12. Receiver VOH and VOL  
Figure 13. Receiver Differential Propagation Delay Test Circuit  
Figure 14. Receiver Differential Propagation Delay Waveforms  
Figure 15. Receiver TRI-STATE Test Circuit  
Copyright © 1998–2013, Texas Instruments Incorporated  
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DS36C278  
SNLS096C JULY 1998REVISED APRIL 2013  
www.ti.com  
Figure 16. Receiver Enable and Disable Waveforms (tPLZ, tPZL  
)
Figure 17. Receiver Enable and Disable Waveforms (tPHZ, tPZH  
)
Typical Application Information  
Figure 18. Typical RS-485 Bus Interface  
Unit Load  
A unit load for an RS-485 receiver is defined by the input current versus the input voltage curve. The gray  
shaded region is the defined operating range from 7V to +12V. The top border extending from 3V at 0 mA to  
+12V at +1 mA is defined as one unit load. Likewise, the bottom border extending from +5V at 0 mA to 7V at  
0.8 mA is also defined as one unit load (see Figure 19). An RS-485 driver is capable of driving up to 32 unit  
loads. This allows up to 32 nodes on a single bus. Although sufficient for many applications, it is sometimes  
desirable to have even more nodes. For example, an aircraft that has 32 rows with 4 seats per row would benefit  
from having 128 nodes on one bus. This would allow signals to be transferred to and from each individual seat to  
1 main station. Usually there is one or two less seats in the last row of the aircraft near the restrooms and food  
storage area. This frees the node for the main station.  
The DS36C278, the DS36C279, and the DS36C280 all have ½ unit load and ¼ unit load (UL) options available.  
These devices will allow up to 64 nodes or 128 nodes guaranteed over temperature depending upon which  
option is selected. The ½ UL option is available in industrial temperature and the ¼ UL is available in commercial  
temperature.  
8
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Product Folder Links: DS36C278  
DS36C278  
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SNLS096C JULY 1998REVISED APRIL 2013  
First, for a ½ UL device the top and bottom borders shown in Figure 19 are scaled. Both 0 mA reference points  
at +5V and 3V stay the same. The other reference points are +12V at +0.5 mA for the top border and 7V at  
0.4 mA for the bottom border (see Figure 19). Second, for a ¼ UL device the top and bottom borders shown in  
Figure 19 are scaled also. Again, both 0 mA reference points at +5V and 3V stay the same. The other  
reference points are +12V at +0.25 mA for the top border and 7V at 0.2 mA for the bottom border (see  
Figure 19).  
The advantage of the ½ UL and ¼ UL devices is the increased number of nodes on one bus. In a single master  
multi-slave type of application where the number of slaves exceeds 32, the DS36C278/279/280 may save in the  
cost of extra devices like repeaters, extra media like cable, and/or extra components like resistors.  
The DS36C279 and DS36C280 have an additional feature which offers more advantages. The DS36C279 has  
an automatic sleep mode function for power conscious applications. The DS36C280 has a slew rate control for  
EMI conscious applications. Refer to the sleep mode and slew rate control portion of the application information  
section in the corresponding datasheet for more information on these features.  
Figure 19. Input Current vs Input Voltage Operating Range  
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DS36C278  
SNLS096C JULY 1998REVISED APRIL 2013  
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REVISION HISTORY  
Changes from Revision B (April 2013) to Revision C  
Page  
Changed layout of National Data Sheet to TI format ............................................................................................................ 9  
10  
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PACKAGE OPTION ADDENDUM  
www.ti.com  
25-Aug-2017  
PACKAGING INFORMATION  
Orderable Device  
DS36C278M/NOPB  
DS36C278MX/NOPB  
DS36C278TM  
Status Package Type Package Pins Package  
Eco Plan  
Lead/Ball Finish  
MSL Peak Temp  
Op Temp (°C)  
0 to 70  
Device Marking  
Samples  
Drawing  
Qty  
(1)  
(2)  
(6)  
(3)  
(4/5)  
LIFEBUY  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
D
8
8
8
8
8
8
95  
Green (RoHS  
& no Sb/Br)  
CU SN  
CU SN  
Call TI  
CU SN  
Call TI  
CU SN  
Level-1-260C-UNLIM  
Level-1-260C-UNLIM  
Call TI  
DS36C  
278M  
LIFEBUY  
LIFEBUY  
LIFEBUY  
LIFEBUY  
NRND  
D
D
D
D
D
2500  
95  
Green (RoHS  
& no Sb/Br)  
0 to 70  
DS36C  
278M  
TBD  
0 to 70  
36C27  
8TM  
DS36C278TM/NOPB  
DS36C278TMX  
95  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
Call TI  
0 to 70  
36C27  
8TM  
2500  
2500  
TBD  
0 to 70  
36C27  
8TM  
DS36C278TMX/NOPB  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
0 to 70  
36C27  
8TM  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance  
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may  
reference these types of products as "Pb-Free".  
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.  
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based  
flame retardants must also meet the <=1000ppm threshold requirement.  
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.  
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.  
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation  
of the previous line and the two combined represent the entire Device Marking for that device.  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
25-Aug-2017  
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish  
value exceeds the maximum column width.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information  
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and  
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.  
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.  
Addendum-Page 2  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
11-Oct-2013  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0  
B0  
K0  
P1  
W
Pin1  
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant  
(mm) W1 (mm)  
DS36C278MX/NOPB  
DS36C278TMX  
SOIC  
SOIC  
SOIC  
D
D
D
8
8
8
2500  
2500  
2500  
330.0  
330.0  
330.0  
12.4  
12.4  
12.4  
6.5  
6.5  
6.5  
5.4  
5.4  
5.4  
2.0  
2.0  
2.0  
8.0  
8.0  
8.0  
12.0  
12.0  
12.0  
Q1  
Q1  
Q1  
DS36C278TMX/NOPB  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
11-Oct-2013  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
DS36C278MX/NOPB  
DS36C278TMX  
SOIC  
SOIC  
SOIC  
D
D
D
8
8
8
2500  
2500  
2500  
367.0  
367.0  
367.0  
367.0  
367.0  
367.0  
35.0  
35.0  
35.0  
DS36C278TMX/NOPB  
Pack Materials-Page 2  
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