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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
D D D D D D D D D D D D D D
Bidirectional Transceiver With Fail-Safe Receiver Meets or Exceeds the Requirements of ITU Recommendation V.11 Electrically Compatible With ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Driver and Receiver Outputs Individual Driver and Receiver Enables Wide Positive and Negative Input/Output Bus Voltage Ranges Driver Output Capability . . . 60 mA Max Thermal Shutdown Protection Driver Positive and Negative Current Limiting Receiver Input Impedance . . . 12 k Min Receiver Input Sensitivity . . . - 300 mV/0 mV Operates From Single 5-V Supply Pin-to-Pin Compatible With SN75176A
D OR P PACKAGE (TOP VIEW)
R RE DE D
1 2 3 4
8 7 6 5
VCC B A GND
description
The SN75276 differential bus transceiver is a monolithic, integrated circuit designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and is electrically compatible with ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A, and meets ITU Recommendation V.11. The fail-safe operation ensures a known level on the circuit output under bus fault conditions. The circuit provides a high-level output under floating-line, idle-line, open-circuit, and short-circuit bus conditions (see Function Tables). The SN75276 combines a 3-state, differential line driver and a differential input line receiver, both of which operate from a single, 5-V power supply. The driver and receiver have active-high and active-low enables, respectively, that can be externally connected together to function as a direction control. The driver differential outputs and the receiver differential inputs are connected internally to form differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. These ports feature wide positive and negative common-mode voltage ranges making the device suitable for party-line applications. The driver is designed for up to 60 mA of sink or source current. The driver features positive- and negative-current limiting and thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150C. The receiver features a minimum input impedance of 12 k. The SN75276 can be used in transmission line applications employing the SN75172 and SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers. SN75276 is characterized for operation from 0C to 70C.
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. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright (c) 1998, Texas Instruments Incorporated
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
Function Tables
EACH DRIVER INPUT D H L X ENABLE DE H H L OUTPUTS A H L Z B L H Z
EACH RECEIVER DIFFERENTIAL A-B VID 0 V - 0.3 V < VID < 0 V VID - 0.3 X Open ENABLE RE L L L H L OUTPUT R H ? L Z H
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = high impedance (off)
logic symbol
DE RE 3 2 EN1 EN2 6 7
logic diagram (positive logic)
DE D RE A B R 3 4 2 1 6 7 A B Bus
D
4
1 1
R
1
2
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT VCC R(eq) TYPICAL OF A AND B I/O PORTS VCC 180 k NOM Connected on A Port Input A or B 18 k NOM 3 k NOM Output TYPICAL OF RECEIVER OUTPUT VCC 85 NOM
Driver input: R(eq) = 3 k NOM Enable inputs: R(eq) = 8 k NOM R(eq) = equivalent resistor
180 k NOM Connected on B Port
1.1 k NOM
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 10 V to 15 V Enable input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C
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. NOTE 1: All voltage values, except differential input/output bus voltage, are with respect to network ground terminal. DISSIPATION RATING TABLE PACKAGE D P TA 25C POWER RATING 725 mW 1100 mW DERATING FACTOR ABOVE TA = 25C 5.8 mW/C 8.8 mW/C TA = 70C POWER RATING 464 mW 704 mW TA = 105C POWER RATING 261 mW 396 mW
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
recommended operating conditions
MIN Supply voltage, VCC Voltage at any bus terminal (separately or common mode), VI or VIC mode) High-level input voltage, VIH Low-level input voltage, VIL Differential input voltage, VID (see Note 2) High-level High level output current, IOH current Low-level Low level output current, IOL current Operating free-air temperature, TA Driver Receiver Driver Receiver 0 D, DE, and RE D, DE, and RE 2 0.8 12 - 60 - 400 60 8 70 4.75 TYP 5 MAX 5.25 12 -7 UNIT V V V V V mA A mA C
NOTE 2: Differential input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER VIK VO |VOD1| |VOD2| VOD3 |VOD| VOC |VOC| IO IIH IIL Input clamp voltage Output voltage Differential output voltage Differential output voltage Differential output voltage Change in magnitude of differential output g g voltage Common-mode Common mode output voltage Change in magnitude of common-mode g g output voltage Output current High-level input current Low-level input current Output disabled, , See Note 4 VI = 2.4 V VI = 0.4 V VO = - 7 V VO = 0 VO = VCC VO = 12 V No load Outputs enabled Outputs disabled 42 26 VO = 12 V VO = - 7 V RL = 54 or 100 , See Figure 1 TEST CONDITIONS II = - 18 mA IO = 0 IO = 0 RL = 100 , RL = 54 , See Note 3 See Figure 1 See Figure 1 MIN 0 1.5 3.6 1/2 VOD1or 2 1.5 2.5 1.5 TYP MAX - 1.5 6 6 UNIT V V V V 5 5 0 2 0.2 +3 -1 0 2 0.2 1 - 0.8 20 - 400 - 250 150 250 250 70 35 mA mA V V V V V mA A A
IOS
Short-circuit Short circuit output current
ICC
Supply current (total package)
The power-off measurement in ANSI Standard TIA/EIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs. All typical values are at VCC = 5 V and TA = 25C. The minimum VOD2 with a 100- load is either 1/2 VOD1 or 2 V, whichever is greater. |VOD| and |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. NOTES: 3. This applies for both power on and off; refer to TIA/EIA-485-A for exact conditions. The TIA/EIA-422-B limit does not apply for a combined driver and receiver terminal. 4. See TIA/EIA-485-A Figure 3.5, Test Termination Measurement 2.
switching characteristics, VCC = 5 V, RL = 110 k, TA = 25C (unless otherwise noted)
PARAMETER td(OD) tt(OD) tPZH tPZL tPHZ tPLZ Differential-output delay time Differential-output transition time Output enable time to high level Output enable time to low level Output disable time from high level Output disable time from low level TEST CONDITIONS RL = 54 , See Figure 4 See Figure 5 See Figure 4 See Figure 5 See Figure 3 MIN TYP 15 20 85 40 150 20 MAX 22 30 120 60 250 30 UNIT ns ns ns ns ns ns
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
DRIVER SECTION
SYMBOL EQUIVALENTS DATA-SHEET PARAMETER VO |VOD1| |VOD2| VOD3 |VOD| VOC |VOC| IOS IO TIA/EIA-422-B Voa, Vob Vo Vt (RL = 100 ) None ||Vt| - |Vt|| |Vos| |Vos - Vos| |Isa|, |Isb| |Ixa|, |Ixb| TIA/EIA-485-A Voa, Vob Vo Vt (RL = 54 ) Vt (Test Termination Measurement 2) ||Vt - |Vt|| |Vos| |Vos - Vos| Iia, Iib
RECEIVER SECTION electrical characteristics over recommended ranges of common-mode input voltage, supply voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER VIT + VIT - VIK VOH VOL IOZ II IIH IIL ri IOS ICC Positive-going input threshold voltage Negative-going input threshold voltage Enable clamp voltage High-level High level output voltage Low level output voltage Low-level High-impedance-state output current Line input current High-level enable input current Low-level enable input current Input resistance Short-circuit output current Supply current (total package) No load Outputs enabled Outputs disabled VO = 2.7 V, VO = 0.5 V, II = - 18 mA VID = 0, , See Figure 2 VID = - 300 mV, , See Figure 2 VO = 0.4 V to 2.4 V Other input = 0 V, , See Note 5 VIH = 2.7 V VIL = 0.4 V VI = 12 V 12 - 15 42 26 - 85 55 35 VI = 12 V VI = - 7 V IOH = - 400 , A, IOL = 8 mA, , 2.7 27 0 45 0.45 20 1 - 0.8 20 - 100 TEST CONDITIONS IO = - 0.4 mA IO = 8 mA MIN - 0.3 - 1.5 TYP MAX 0 UNIT V V V V V A mA A A k mA mA
All typical values are at VCC = 5 V, TA = 25C. The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet for negative-going input threshold voltage levels only. NOTE 5: This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions.
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
RECEIVER SECTION switching characteristics, VCC = 5 V, CL = 15 pF, TA = 25C
PARAMETER tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation delay time, low- to high-level output Propagation delay time, high- to low-level output Output enable time to high level Output enable time to low level Output disable time from high level Output disable time from low level TEST CONDITIONS VID = 0 to 3 V See Figure 6 V, See Figure 7 See Figure 7 MIN TYP 21 23 10 12 20 17 MAX 35 35 20 20 35 25 UNIT ns ns ns ns ns ns
PARAMETER MEASUREMENT INFORMATION
RL VOD2 2 RL 2 VOC
Figure 1. Driver VOD and VOC
VID VOH VOL +IOL - IOH
Figure 2. Receiver VOH and VOL
3V Input RL = 54 CL = 50 pF (see Note B) Output td(OD) Output 50% 10% 90% 1.5 V 1.5 V 0V td(OD) 2.5 V 50% 10% - 2.5 V tt(OD)
Generator (see Note A)
50 3V
tt(OD) TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: 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 . B. CL includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Voltage Waveforms
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
Output S1 0 V or 3 V CL = 50 pF (see Note B) RL = 110 tPZH Output 2.3 V tPHZ VOLTAGE WAVEFORMS Input 1.5 V 1.5 V 0V 0.5 V VOH Voff 0 V 3V
Generator (see Note A)
50
TEST CIRCUIT
NOTES: 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 . B. CL includes probe and jig capacitance.
Figure 4. Driver Test Circuit and Voltage Waveforms
5V RL = 110 Output tPZL CL = 50 pF (see Note B) 50 Output 2.3 V tPLZ 5V 0.5 V VOL TEST CIRCUIT VOLTAGE WAVEFORMS Input 1.5 V 1.5 V 0V
3V
S1 3 V or 0 V
Generator (see Note A)
NOTES: 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 . B. CL includes probe and jig capacitance.
Figure 5. Driver Test Circuit and Voltage Waveforms
3V Generator (see Note A) 51 1.5 V CL = 15 pF (see Note B) 0V tPLH Output 1.3 V tPHL VOH 1.3 V VOL TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: 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 . B. CL includes probe and jig capacitance. Output Input 1.5 V 1.5 V 0V
Figure 6. Receiver Test Circuit and Voltage Waveforms
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
1.5 V -1.5 V S1 2 k S2 5V
CL = 15 pF (see Note B) Generator (see Note A) 50
5 k
1N916 or Equivalent
S3 TEST CIRCUIT 3V Input 1.5 V S1 to 1.5 V 0 V S2 Open S3 Closed VOH Output 1.5 V 0V Output 1.5 V VOL 3V Input 1.5 V 0V tPHZ 0.5 V Output 1.3 V VOLTAGE WAVEFORMS NOTES: 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 . B. CL includes probe and jig capacitance. VOH Output 0.5 V VOL tPLZ 1.3 V S1 to 1.5 V S2 Closed S3 Closed Input 1.5 V 0V 3V S1 to - 1.5 V S2 Closed S3 Closed 4.5 V Input 3V 1.5 V S1 to -1.5 V 0 V S2 Closed S3 Open
tPZH
tPZL
Figure 7. Receiver Test Circuit and Voltage Waveforms
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
TYPICAL CHARACTERISTICS
DRIVER DRIVER
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
5 VOH VOH - High-Level Output Voltage - V 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 - 20 - 40 - 60 - 80 - 100 IOH - High-Level Output Current - mA - 120 VCC = 5 V TA = 25C VOL - Low-Level Output Voltage - V 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
VCC = 5 V TA = 25C
20 40 60 80 100 IOL - Low-Level Output Current - mA
120
Figure 8
DRIVER
Figure 9
DIFFERENTIAL OUTPUT VOLTAGE vs OUTPUT CURRENT
4 VCC = 5 V TA = 25C
VOD VOD - Differential Output Voltage - V
3.5 3 2.5 2 1.5 1 0.5 0
0
10
20
30 40 50 60 70 80 IO - Output Current - mA
90 100
Figure 10
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
TYPICAL CHARACTERISTICS
RECEIVER RECEIVER
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
5 4.5 VOH VOH - High-Level Output Voltage - V 4 3.5 3 2.5 2 1.5 1 0.5 0 0 - 5 - 10 - 15 - 20 - 25 - 30 - 35 - 40 - 45 - 50 IOH - High-Level Output Current - mA VCC = 4.75 V VCC = 5.25 V VCC = 5 V VID = 0.2 V TA = 25C 5 4.5 VOH VOH - High-Level Output Voltage - V 4 3.5 3 2.5 2 1.5 1 0.5 0 - 40
HIGH-LEVEL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE
VCC = 5 V VID = 200 mV IOH = - 440 A
- 20
0
20
40
60
80
100
120
TA - Free-Air Temperature - C
Figure 11
RECEIVER
Figure 12
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
0.6 VOL VOL - Low-Level Output Voltage - V VCC = 5 V TA = 25C VOL VOL - Low-Level Output Voltage - V 0.6
LOW-LEVEL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE
VCC = 5 V VID = - 200 mV IOL = 8 mA
0.5
0.5
0.4
0.4
0.3
0.3
0.2
0.2
0.1
0.1
0 0 5 10 15 20 25 30 IOL - Low-Level Output Current - mA
0 - 40
- 20
0
20
40
60
80
100
120
TA - Free-Air Temperature - C
Figure 13
Figure 14
Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied.
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SN75276 FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER
SLLS212B - SEPTEMBER 1995 - REVISED APRIL 1998
TYPICAL CHARACTERISTICS
RECEIVER RECEIVER
OUTPUT VOLTAGE vs ENABLE VOLTAGE
5 VID = 0.2 V Load = 8 k to GND TA = 25C 6
OUTPUT VOLTAGE vs ENABLE VOLTAGE
VCC = 5.25 V VID = - 0.2 V Load = 1 k to VCC TA = 25C VCC = 5 V
4 VO VO - Output Voltage - V
VCC = 5.25 V VO VO - Output Voltage - V
5 VCC = 4.75 V 4
3
VCC = 5 V
VCC = 4.75 V
3
2
2
1 1 0 0 0.5 1 1.5 2 2.5 3 VI - Enable Voltage - V
0 0 0.5 1 1.5 2 2.5 3 VI - Enable Voltage - V
Figure 15
Figure 16
APPLICATION INFORMATION
SN75276 SN75276
RT
RT
Up to 32 Unit Loads
NOTE A: The line should be terminated at both ends in its characteristic impedance. Stub lengths off the main line should be kept as short as possible (RT = ZO).
Figure 17. Typical Application Circuit
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PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device SN75276D SN75276DR SN75276P
(1)
Status (1) OBSOLETE OBSOLETE OBSOLETE
Package Type SOIC SOIC PDIP
Package Drawing D D P
Pins Package Eco Plan (2) Qty 8 8 8 TBD TBD TBD
Lead/Ball Finish Call TI Call TI Call TI
MSL Peak Temp (3) Call TI Call TI Call TI
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) 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. 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.
Addendum-Page 1
MECHANICAL DATA
MPDI001A - JANUARY 1995 - REVISED JUNE 1999
P (R-PDIP-T8)
0.400 (10,60) 0.355 (9,02) 8 5
PLASTIC DUAL-IN-LINE
0.260 (6,60) 0.240 (6,10)
1
4 0.070 (1,78) MAX 0.325 (8,26) 0.300 (7,62) 0.015 (0,38) 0.200 (5,08) MAX Seating Plane 0.125 (3,18) MIN 0.010 (0,25) NOM Gage Plane
0.020 (0,51) MIN
0.100 (2,54) 0.021 (0,53) 0.015 (0,38) 0.010 (0,25) M
0.430 (10,92) MAX
4040082/D 05/98 NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Falls within JEDEC MS-001
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm
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