DS36950
DS36950 Quad Differential Bus Transceiver
Literature Number: SNLS075B
DS36950
Quad Differential Bus Transceiver
General Description
The DS36950 is a low power, space-saving quad EIA-485
differential bus transceiver especially suited for high speed,
parallel, multipoint, computer I/O bus applications. A com-
pact 20-pin surface mount PLCC package provides high
transceiver integration and a very small PC board footprint.
Timing uncertainty across an interface using multiple de-
vices, a typical problem in a parallel interface, is
specified — minimum and maximum propagation delay times
are guaranteed.
Six devices can implement a complete IPI master or slave
interface. Three transceivers in a package are pinned out for
connection to a parallel databus. The fourth transceiver, with
the flexibility provided by its individual enables, can serve as
a control bus transceiver.
Features
nPinout for IPI interface
nCompact 20-pin PLCC package
nMeets EIA-485 standard for multipoint bus transmission
nGreater than 60 mA source/sink
nThermal Shutdown Protection
Pinout and Logic Diagram
01060201
Order Number DS36950
See NS Package Number V20A
01060202
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
July 1998
DS36950 Quad Differential Bus Transceiver
© 2004 National Semiconductor Corporation DS010602 www.national.com
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 7V
Control Input Voltage V
CC
+ 0.5V
Driver Input Voltage V
CC
+ 0.5V
Driver Output Voltage/Receiver
Input Voltage −10V to +15V
Receiver Output Voltage 5.5V
Continuous Power Dissipation @
25˚C
V Package 1.73W
Derate V Package 13.9 mW/˚C above 25˚C
Storage Temp. Range −65˚C to +150˚C
Lead Temp. (Soldering 4 Sec.) 260˚C
Recommended Operating
Conditions
Supply Voltage, V
CC
4.75V to 5.25V
Bus Voltage −7V to +12V
Operating Free Air Temp. (T
A
) 0˚C to +70˚C
Electrical Characteristics (Note 2)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
DRIVER CHARACTERISTICS
V
ODL
Differential Driver Output I
L
= 60 mA 1.5 1.9 V
Voltage (Full Load) V
CM
=0V
V
OD
Differential Driver Output R
L
= 100Ω(EIA-422) 2.0 3.5 V
Voltage (Termination Load) R
L
=54Ω(EIA-485) 1.5 3.2 V
∆IV
OD
I Change in Magnitude of Driver R
L
=54Ωor 100Ω
Differential Output Voltage for (Note 4) (Figure 1) 0.2 V
Complementary Output States (EIA-485)
V
OC
Driver Common Mode Output R
L
=54Ω3.0 V
Voltage (Note 5) (Figure 1) (EIA-485)
∆IV
OC
I Change in Magnitude of Common (Note 4) (Figure 1) 0.2 V
Mode Output Voltage (EIA-485)
V
OH
Output Voltage HIGH I
OH
= −55 mA 2.7 3.2 V
V
OL
Output Voltage LOW I
OL
= 55 mA 1.4 1.7 V
V
IH
Input Voltage HIGH 2.0 V
V
IL
Input Voltage LOW 0.8 V
V
CL
Input Clamp Voltage I = −18 mA −1.5 V
I
IH
Input High Current V
I
= 2.4V (Note 3) 20 µA
I
IL
Input Low Current V
I
= 0.4V (Note 3) −20 µA
I
OSC
Driver Short-Circuit V
O
= −7V (EIA-485) −130 −250 mA
Output Current V
O
= 0V (EIA-422) −90 −150 mA
(Note 9) V
O
= +12V (EIA-485) 130 250 mA
RECEIVER CHARACTERISTICS
I
OSR
Short Circuit Output Current V
O
= 0V (Note 9) −15 −28 −75 mA
I
OZ
TRI-STATE®Output Current V
O
= 0.4V to 2.4V 20 µA
V
OH
Output Voltage High V
ID
= 0.20V, I
OH
= −0.4 mA 2.4 3.0 V
V
OL
Output Voltage Low V
ID
= −0.20V, I
OL
= 4 mA 0.35 0.5 V
V
TH
Differential Input High V
O
=V
OH
,I
O
= −0.4 mA 0.03 0.20 V
Threshold Voltage (EIA-422/485)
V
TL
Differential Input Low V
O
=V
OL
,I
O
= 4.0 mA −0.20 −0.03 V
Threshold Voltage (Note 6) (EIA-422/485)
V
HST
Hysteresis (Note 7) V
CM
=0V 35 60 mV
DRIVER AND RECEIVER CHARACTERISTICS
V
IH
Enable Input Voltage High 2.0 V
V
IL
Enable Input Voltage Low 0.8 V
DS36950
www.national.com 2
Electrical Characteristics (Note 2) (Continued)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
DRIVER AND RECEIVER CHARACTERISTICS
V
CL
Enable Input Clamp Voltage I = −18 mA −1.5 V
I
IN
Line Input Current Other Input = 0V V
I
= +12V 0.5 1 mA
(Note 8) V
I
= −7V −0.45 −0.8 mA
I
IH
Enable Input Current High V
OH
= 2.4V RE4 or DE 20 µA
REC 60 µA
I
IL
Enable Input Current Low V
OL
= 0.4V RE4 or DE −20 µA
REC −60 µA
I
CC
Supply Current (Note 10) No Load, Outputs Enabled 75 90 mA
I
CCZ
Supply Current (Note 10) No Load, Outputs Disabled 50 70 mA
Switching Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Conditions Min Typ Max Units
DRIVER SINGLE-ENDED CHARACTERISTICS
t
PZH
R
L
= 110Ω(Figure 4)3540ns
t
PZL
R
L
= 110Ω(Figure 5)2540ns
t
PHZ
R
L
= 110Ω(Figure 4)1525ns
t
PLZ
R
L
= 110Ω(Figure 5)3540ns
DRIVER DIFFERENTIAL CHARACTERISTICS
t
R
,t
F
Rise & Fall Time R
L
=54Ω13 16 ns
t
PLHD
Differential Propagation C
L
= 50 pF 9 15 19 ns
t
PHLD
Delays (Note 15) C
D
= 15 pF 9 15 19 ns
t
SKD
|t
PLHD
−t
PHLD
| Differential Skew (Figures 3, 8)36ns
RECEIVER CHARACTERISTICS
t
PLHD
Differential Propagation Delays 9 14 19 ns
t
PHLD
C
L
= 15 pF, V
CM
= 1.5V (Figure 6) 9 14 19 ns
t
SKD
|t
PLHD
−t
PHLD
| Differential Receiver Skew 1 3 ns
t
ZH
Output Enable Time to High Level 15 22 ns
t
ZL
Output Enable Time to Low Level C
L
=15pF 20 30 ns
t
HZ
Output Disable Time from High Level (Figure 7)1017ns
t
LZ
Output Disable Time from Low Level 17 25 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 devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.
Note 2: Current into device pins is define as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: IIH and IIL includes driver input current and receiver TRI-STATE leakage current.
Note 4: ∆IVODI and ∆IVOCI are changes in magnitude of VOD and VOC, respectively, that occur when the input changes state.
Note 5: In EIA Standards EIA-422 and EIA-485, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
Note 6: Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 7: Hysteresis defined as VHST =V
TH −V
TL.
Note 8: IIN includes the receiver input current and driver TRI-STATE leakage current.
Note 9: Short one output at a time.
Note 10: Total package supply current.
Note 11: All typicals are given for VCC = 5.0V and TA= 25˚C.
DS36950
www.national.com3
Parameter Measurement Information
01060203
FIGURE 1. Driver V
OD
and V
OC
01060204
FIGURE 2. Receiver V
OH
and V
OL
01060205
01060206
FIGURE 3. Driver Differential Propagation Delay and Transition Timing
DS36950
www.national.com 4
Parameter Measurement Information (Continued)
01060209
S1 to OA for DI = 3V
S1 to OB for DI = 0V
01060210
FIGURE 4. Driver Enable and Disable Timing (t
PZH
,t
PHZ
)
01060211
S1 to OA for DI = 0V
S1 to OB for DI = 3V
01060212
FIGURE 5. Driver Enable and Disable Timing (t
PZL
,t
PLZ
)
DS36950
www.national.com5
Parameter Measurement Information (Continued)
01060213
01060214
FIGURE 6. Receiver Differential Propagation Delay Timing
DS36950
www.national.com 6
Parameter Measurement Information (Continued)
01060215
01060216
S1 1.5V
S2 OPEN
S3 CLOSED
01060217
S1 −1.5V
S2 CLOSED
S3 OPEN
01060218
S1 1.5V
S2 CLOSED
S3 CLOSED
01060219
S1 −1.5V
S2 CLOSED
S3 CLOSED
FIGURE 7. Receiver Enable and Disable Timing
DS36950
www.national.com7
Parameter Measurement Information (Continued)
Note 12: The input pulse is supplied by a generator having the following characteristics:
f = 1.0 MHz, 50% Duty Cycle, tfand tr<6.0 ns, ZO=50Ω
Note 13: CLincludes probe and stray capacitance.
Note 14: Diodes are 1N916 or equivalent.
Note 15: Differential propagation delays are calculated from single-ended propagation delays measured from driver input to the 20% and 80% levels on the driver
outputs (See Figure 8).
Typical Performance Characteristics
Driver Differential Propagation
Delay vs Temperature
Driver Differential Propagation
Delay vs V
CC
01060223 01060224
01060220
TCP = Crossing Point
Tra, Trb, Tfa, and Tfb are propagation delay
measurements to the 20% and 80% levels.
FIGURE 8. Propagation Delay Timing for Calculation of Driver Differential Propagation Delays
DS36950
www.national.com 8
Typical Performance Characteristics (Continued)
Driver Transition Time
vs Temperature
Driver Transition Time
vs V
CC
01060225 01060227
Driver V
OH
vs I
OH
vs Temperature
Driver V
OH
vs I
OH
vs V
CC
01060226 01060228
Driver V
OL
vs I
OL
vs Temperature
Driver V
OL
vs I
OL
vs V
CC
01060229 01060230
DS36950
www.national.com9
Typical Performance Characteristics (Continued)
Driver V
OD
vs I
O
vs Temperature
Driver V
OD
vs I
O
vs V
CC
01060231 01060232
Receiver Differential
Propagation Delay
vs Temperature
Receiver Differential
Propagation
Delay vs V
CC
01060233 01060234
Receiver V
OH
vs I
OH
vs Temperature
Receiver V
OH
vs I
OH
vs V
CC
01060235 01060236
DS36950
www.national.com 10
Typical Performance Characteristics (Continued)
Receiver V
OL
vs I
OL
vs Temperature
Receiver V
OL
vs I
OL
vs V
CC
01060237 01060238
Supply Current
vs Temperature
Power Supply Current vs
Power Supply Voltage
01060239 01060240
Driver I
CC
vs Switching
Frequency
01060241
DS36950
www.national.com11
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number DS36950
NS Package Number V20A
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.
For the most current product information visit us at www.national.com.
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 AND GENERAL COUNSEL 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.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: ap.support@nsc.com
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
DS36950 Quad Differential Bus Transceiver
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products Applications
Audio www.ti.com/audio Communications and Telecom www.ti.com/communications
Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers
Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps
DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy
DSP dsp.ti.com Industrial www.ti.com/industrial
Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical
Interface interface.ti.com Security www.ti.com/security
Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Mobile Processors www.ti.com/omap
Wireless Connectivity www.ti.com/wirelessconnectivity
TI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright ©2011, Texas Instruments Incorporated
