SN75ALS181
www.ti.com
SLLS152C –DECEMBER 1992–REVISED MAY 2010
DIFFERENTIAL DRIVER AND RECEIVER PAIR
Check for Samples: SN75ALS181
1FEATURES
• Meets TIA/EIA-422-B, TIA/EIA-485-A, and • Glitch-Free Power-Up and Power-Down
CCITT Recommendations V.11 and X.27 Protection
• Low Supply-Current Requirements... N OR NS PACKAGE
30 mA Max (TOP VIEW)
• Driver Output Capacity...±60 mA
• Thermal Shutdown Protection
• Driver Common-Mode Output Voltage Range
of –7 V to 12 V
• Receiver Input Impedance...12 kΩMin
• Receiver Input Sensitivity...±200 mV
• Receiver Input Hysteresis...60 mV Typ
• Receiver Common-Mode Input Voltage Range
of ±12 V N.C. – No internal connection
• Operates From Single 5-V Supply
DESCRIPTION
The SN75ALS181 is a differential driver and receiver pair designed for bidirectional data communication on
multipoint bus transmission lines. The design provides for balanced transmission lines and meets TIA/EIA-422-B
and TIA/EIA-485-A, and CCITT recommendations V.10, V.11, X.26, and X.27.
The SN75ALS181 combines a 3-state differential line driver and a differential-input line receiver that operate from
a single 5-V power supply. The driver and receiver have active-high and active-low enables, respectively, that
can be connected together externally to function as a direction control. The driver differential outputs and the
receiver differential inputs are connected to separate pins for greater flexibility and are designed to offer
minimum loading to the bus when the driver is disabled or VCC = 0. These ports feature wide positive and
negative common-mode voltage changes, making the device suitable for party-line applications.
ORDERING INFORMATION
TAPACKAGE(1) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING
PDIP – N Tape and reel SN75ALS181N SN75ALS181N
0°C to 70°C SOP – NS Tape and reel SN75ALS181NSR 75ALS181
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
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.
PRODUCTION DATA information is current as of publication date. Copyright © 1992–2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
SN75ALS181
SLLS152C –DECEMBER 1992–REVISED MAY 2010
www.ti.com
FUNCTION TABLES
Each Driver
INPUTS ENABLE OUTPUTS
D DE Y Z
H H H L
L H L H
X L Z Z
Each Receiver(1)
DIFFERENTIAL ENABLE OUTPUT
A–B RE R
VID ≥0.2 V L H
–0.2 V < VID < 0.2 V L ?
VID ≤–0.2 V L L
X H Z
(1) H = high level, L = low level, ? = indeterminate, X = irrelevant,
Z = high impedance (off)
LOGIC DIAGRAM (POSITIVE LOGIC)
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Product Folder Link(s): SN75ALS181
SN75ALS181
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SLLS152C –DECEMBER 1992–REVISED MAY 2010
SCHEMATICS OF INPUTS
SCHEMATICS OF OUTPUTS
Copyright © 1992–2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): SN75ALS181
SN75ALS181
SLLS152C –DECEMBER 1992–REVISED MAY 2010
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT
VCC Supply voltage range(2) 7 V
Input voltage range D, DE, and RE inputs 7 V
Output voltage range Driver –9 14 V
Input voltage range Receiver –14 14 V
Receiver differential input voltage range(3) –14 14 V
N package 80
qJA Package thermal impedance(4)(5) °C/W
NS package 76
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 °C
Tstg Storage temperature range –65 150 °C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating
conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values, except differential input voltage, are with respect to network ground terminal.
(3) Differential input voltage is measured at the noninverting terminal with respect to the inverting terminal.
(4) Maximum power dissipation is a function of TJ(max), qJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/qJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
(5) The package thermal impedance is calculated in accordance with JESD 51-7.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
VCC Supply voltage 4.75 5 5.25 V
VOC Common-mode output voltage(1) Driver –7 12 V
VIC Common-mode input voltage(1) Receiver –12 12 V
VIH High-level input voltage D, DE, and RE 2 V
VIL Low-level input voltage D, DE, and RE 0.8 V
VID Differential input voltage ±12 V
Driver –60 mA
IOH High-level output current Receiver –400 µA
Driver 60
IOL Low-level output current mA
Receiver 8
TAOperating free-air temperature 0 70 °C
(1) The algebraic convention, where the less positive (more negative) limit is designated as minimum, is used in this table for
common-mode output voltage level only.
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SN75ALS181
www.ti.com
SLLS152C –DECEMBER 1992–REVISED MAY 2010
Driver Section
ELECTRICAL CHARACTERISTICS
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
VIK Input clamp voltage II= –18 mA –1.5 V
VOOutput voltage IO= 0 0 6 V
|VOD1| Differential output voltage IO= 0 1.5 6 V
1/2 VOD1
VCC = 5 V ,
RL= 100 Ω
|VOD2| Differential output voltage See Figure 1 2 V
RL= 54 Ω1.5 2.3 5
|VOD3| Differential output voltage Vtest = –7 V to 12 V, See Figure 2 1.5 5 V
Change in magnitude of differential output
Δ|VOD| RL= 54 Ωor 100 Ω, See Figure 1 ±0.5 V
voltage 3
VOC Common mode output voltage RL= 54 Ωor 100 Ω, See Figure 1 V
–1
Change in magnitude of common-mode
Δ|VOC| RL= 54 Ωor 100 Ω, See Figure 1 ±0.2 µA
output voltage(2)
IOZ High-impedance-state output current VO= –7 V to 12 V(3) ±100 µA
IIH High-level input current VIH = 2.4 V 20 µA
IIL Low-level input current VIL = 0.4 V –100 µA
VO= –7 V –250
VO= VCC 250
IOS Short circuit output current mA
VO= 12 V 250
VO= 0 V –150
Outputs enabled 21 30
ICC Supply current (total package) No load mA
Outputs disabled 14 21
(1) All typical values are at VCC = 5 V and TA = 25°C.
(2) Δ|VOD| and Δ|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level
to a low level.
(3) This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions
SWITCHING CHARACTERISTICS
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
Differential output delay time, tdDH
tdD RL= 54 Ω, CL= 50 pF, See Figure 3 9 13 20 ns
or tdDL
tsk(p) Pulse skew (|tdDH – tdDL|) RL= 54 Ω, CL= 50 pF, See Figure 3 1 8 ns
ttDifferential output transition time RL= 54 Ω, CL= 50 pF, See Figure 3 3 10 16 ns
tPZH Output enable time to high level RL= 110 Ω, See Figure 4 36 53 ns
tPZL Output enable time to low level RL= 110 Ω, See Figure 5 39 56 ns
tPHZ Output disable time from high level RL= 110 Ω, See Figure 4 20 31 ns
tPLZ Output disable time from low level RL= 110 Ω, See Figure 5 9 20 ns
(1) All typical values are at VCC = 5 V and TA = 25°C.
Copyright © 1992–2010, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): SN75ALS181
SN75ALS181
SLLS152C –DECEMBER 1992–REVISED MAY 2010
www.ti.com
Receiver Section
ELECTRICAL CHARACTERISTICS
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
Positive-going threshold voltage,
VT+ VO= 2.7 V, IO= –0.4 mA 0.2 V
differential input
Negative-going threshold voltage,
VT– VO= 0.5 V, IO= 8 mA –0.2 V
differential input
Vhys Input hysteresis (VT+ – VT–) 60 mV
VIK Input clamp voltage, RE II= –18 mA –1.5 V
VOH High-level output voltage VID = 200 mV, IOH = –400 mA, See Figure 6 2.7 V
VOL Low-level output voltage VID = 200 mV, IOL = 8 mA, See Figure 6 0.45 V
IOZ High-impedance-state output current VO= 0.4 V to 2.4 V ±20 µA
VI= 12 V 1
Other input at 0
IILine input current mA
V(2),VI= –7 V –0.8
IIH High-level input current, RE VIH = 2.7 V 20 µA
IIL Low-level input current, RE VIL = –7 V –100 µA
RIInput resistance 12 kΩ
IOS Short circuit output current VID = 200 mV, VO= 0 V –15 –85 mA
Outputs 21 30
enabled
ICC Supply current (total package) No load mA
Outputs 14 21
disabled
(1) All typical values are at VCC = 5 V and TA = 25°C.
(2) This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions
SWITCHING CHARACTERISTICS
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
tPHL Differential output delay time, tdDH or tdDL VID = –1.5 V to 1.5 V 10 16 25 ns
Propagation delay time, low- to high-level
tPLH VID = –1.5 V to 1.5 V 10 16 25 ns
output
tsk(p) Pulse skew (|tdDH – tdDL|) VID = –1.5 V to 1.5 V 1 8 ns
tPZH Output enable time to high level 7 15 ns
tPZL Output enable time to low level 9 19 ns
tPHZ Output disable time from high level 18 27 ns
tPLZ Output disable time from low level 10 15 ns
(1) All typical values are at VCC = 5 V and TA = 25°C.
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Product Folder Link(s): SN75ALS181
SN75ALS181
www.ti.com
SLLS152C –DECEMBER 1992–REVISED MAY 2010
PARAMETER MEASUREMENT INFORMATION
Figure 1. Driver Test Circuit, VOD and VOC
Figure 2. Driver Circuit, VOD3
A. The input pulse is supplied by a generator having the following characteristics: PRR ≤1 MHz, 50% duty cycle, tr≤6
ns, tf≤6 ns, ZO= 50 Ω
B. CLincludes probe and jig capacitance.
Figure 3. Driver Differential-Output Delay and Transition Times
C. The input pulse is supplied by a generator having the following characteristics: PRR ≤1 MHz, 50% duty cycle, tr≤6
ns, tf≤6 ns, ZO= 50 Ω
D. CLincludes probe and jig capacitance.
Figure 4. Driver Enable and Disable Times
E. The input pulse is supplied by a generator having the following characteristics: PRR ≤1 MHz, 50% duty cycle, tr≤6
ns, tf≤6 ns, ZO= 50 Ω
F. CLincludes probe and jig capacitance.
Copyright © 1992–2010, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Link(s): SN75ALS181
SN75ALS181
SLLS152C –DECEMBER 1992–REVISED MAY 2010
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 5. Driver Enable and Disable Times
Figure 6. Receiver, VOH and VOL
G. The input pulse is supplied by a generator having the following characteristics: PRR ≤1 MHz, 50% duty cycle, tr≤6
ns, tf≤6 ns, ZO= 50 Ω
H. CLincludes probe and jig capacitance.
Figure 7. Receiver Propagation-Delay Times
I. The input pulse is supplied by a generator having the following characteristics: PRR ≤1 MHz, 50% duty cycle, tr≤6
ns, tf≤6 ns, ZO= 50 Ω
J. CLincludes probe and jig capacitance.
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SN75ALS181
www.ti.com
SLLS152C –DECEMBER 1992–REVISED MAY 2010
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 8. Receiver Output Enable and Disable Times
Copyright © 1992–2010, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): SN75ALS181
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
SN75ALS181N ACTIVE PDIP N 14 25 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN75ALS181NE4 ACTIVE PDIP N 14 25 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN75ALS181NSLE OBSOLETE SO NS 14 TBD Call TI Call TI
SN75ALS181NSR ACTIVE SO NS 14 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN75ALS181NSRG4 ACTIVE SO NS 14 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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.
PACKAGE OPTION ADDENDUM
www.ti.com 7-May-2010
Addendum-Page 1
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN75ALS181NSR SO NS 14 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN75ALS181NSR SO NS 14 2000 367.0 367.0 38.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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