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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
D D D D D D D D
Designed for High-Speed Multipoint Data Transmission Over Long Cables Operates With Pulse Widths as Low as 30 ns Low Supply Current . . . 5 mA Max Meets or Exceeds the Standard Requirements of ANSI RS-485 and ISO 8482:1987(E) Common-Mode Voltage Range of - 7 V to 12 V Positive- and Negative-Output Current Limiting Driver Thermal Shutdown Protection Pin Compatible With the SN75179B
D OR P PACKAGE (TOP VIEW)
VCC R D GND
1 2 3 4
8 7 6 5
A B Z Y
Function Tables
DRIVER INPUT D H L OUTPUTS Y Z H L RECEIVER DIFFERENTIAL INPUTS OUTPUT A-B R VID 0.2 V H - 0.2 V < VID < 0.2 V ? L VID - 0.2 V H Open circuit H = high level, ? = indeterminate L = low level, L H
description
The SN65LBC179, SN65LBC179Q, and SN75LBC179 differential driver and receiver pairs are monolithic integrated circuits designed for bidirectional data communication over long cables that take on the characteristics of transmission lines. They are balanced, or differential, voltage mode devices that meet or exceed the requirements of industry standards ANSI RS-485 and ISO 8482:1987(E). Both devices are designed using TI's proprietary LinBiCMOSTM with the low power consumption of CMOS and the precision and robustness of bipolar transistors in the same circuit. The SN65LBC179, SN65LBC179Q, and SN75LBC179 combine a differential line driver and differential line receiver and operate from a single 5-V supply. The driver differential outputs and the receiver differential inputs are connected to separate terminals for full-duplex operation and are designed to present minimum loading to the bus when powered off (VCC = 0). These parts feature a wide common-mode voltage range making them suitable for point-to-point or multipoint data bus applications. The devices also provide positive- and negative-current limiting and thermal shutdown for protection from line fault conditions. The line driver shuts down at a junction temperature of approximately 172C.
logic symbol
2 8 7 3 6 5 A B Z Y
R
D
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
R 2 8 7 5 6 A B Y Z
D
3
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. LinBiCMOS is a trademark of Texas Instruments.
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) 2000, Texas Instruments Incorporated
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
description (continued)
The SN65LBC179, SN65LBC179Q, and SN75LBC179 are available in the 8-pin dual-in-line and small-outline packages. The SN75LBC179 is characterized for operation over the commercial temperature range of 0C to 70C. The SN65LBC179 is characterized over the industrial temperature range of - 40C to 85C. The SN65LBC179Q is characterized over the extended industrial or automotive temperature range of - 40C to 125C.
schematics of inputs and outputs
EQUIVALENT OF DRIVER INPUT VCC VCC 22 k 100 k NOM RECEIVER A INPUT RECEIVER B INPUT VCC
3 k NOM 18 k NOM Input
3 k NOM
Input Input
18 k NOM
12 k 1.1 k NOM 100 k NOM
12 k 1.1 k NOM
DRIVER OUTPUT VCC
TYPICAL OF RECEIVER OUTPUT VCC
R Output
Output
2
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to 7 V Voltage range at A, B, Y, or Z (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 10 V to 15 V Voltage range at D or R (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to VCC + 0.5 V Continuous total power dissipation (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited Total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range, TA: SN65LBC179 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40C to 85C SN65LBC179Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40C to 125C SN75LBC179 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to 70C 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. NOTES: 1. All voltage values are with respect to GND. 2. The maximum operating junction temperature is internally limited. Uses the dissipation rating table to operate below this temperature. 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 = 85C POWER RATING 377 mW 572 mW
recommended operating conditions
MIN Supply voltage, VCC High-level input voltage, VIH Low-level input voltage, VIL Differential input voltage, VID Voltage at any bus terminal (separately or common-mode), VO, VI, or VIC High-level High level output current, IOH current Low-level Low level output current IOL current, A, B, Y, or Z Y or Z R Y or Z R SN65LBC179 Operating free-air temperature, TA SN65LBC179Q SN75LBC179 - 40 - 40 0 D D - 6 -7 4.75 2 0.8 6 12 - 60 -8 60 8 85 125 70 C NOM 5 MAX 5.25 UNIT V V V V V mA mA
The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet for differential input voltage, voltage at any bus terminal (separately or common mode), operating temperature, input threshold voltage, and common-mode output voltage.
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
DRIVER SECTION electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER VIK Input clamp voltage TEST CONDITIONS II = - 18 mA RL = 54 , See Figure 1 | VOD | Differential output voltage (see Note 3) RL = 60 , See Figure 2 | VOD | VOC | VOC | IO IIH IIL IOS ICC Change in magnitude of differential output voltage (see Note 4) Common-mode output voltage Change in magnitude of common-mode output voltage (see Note 4) Output current with power off High-level input current Low-level input current Short-circuit output current y Supply current RL = 54 , VCC = 0, VI = 2.4 V See Figure 1 VO = - 7 V to 12 V SN65LBC179, SN65LBC179Q SN75LBC179 SN65LBC179, SN65LBC179Q SN75LBC179 1.1 1.5 1.1 1.5 2.2 2.2 2.2 2.2 MIN TYP MAX - 1.5 5 5 5 5 0.2 1 2.5 3 0.2 100 - 100 - 100 250 4.2 5 V V V A A A mA mA V UNIT V
See Figures 1 and 2
VI = 0.4 V - 7 V VO 12 V No load SN65LBC179, SN75LBC179
SN65LBC179Q 4.2 7 mA All typical values are at VCC = 5 V and TA = 25C. NOTES: 3. The minimum VOD specification of the SN65179 may not fully comply with ANSI RS-485 at operating temperatures below 0C. System designers should take the possibly lower output signal into account in determining the maximum signal transmission distance. 4. | VOD | and | VOC | are the changes in the steady-state magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low level.
switching characteristics, VCC = 5 V, TA = 25C
PARAMETER td(OD) tt(OD) Differential-output delay time Differential transition time TEST CONDITIONS RL = 54 , See Figure 3 MIN 7 5 MAX 18 20 UNIT ns ns
4
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
RECEIVER SECTION electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER VIT + VIT - Vhys VOH VOL Positive-going input threshold voltage Negative-going input threshold voltage Hysteresis voltage ( VIT + - VIT -) High-level output voltage Low-level output voltage VID = 200 mV, VID = - 200 mV, VI = 12 V, Other inputs at 0 V, VCC = 5 V VI = 12 V, Other inputs at 0 V, VCC = 0 V VI = - 7 V, Other inputs at 0 V, VCC = 5 V VI = - 7 V, Other inputs at 0 V, VCC = 0 V IOH = - 8 mA IOL = 8 mA SN65LBC179, SN75LBC179 SN65LBC179Q SN65LBC179, SN75LBC179 SN65LBC179Q SN65LBC179, SN75LBC179 SN65LBC179Q SN65LBC179, SN75LBC179 SN65LBC179Q 3.5 IO = - 8 mA IO = 8 mA TEST CONDITIONS MIN - 0.2 45 4.5 0.3 0.7 0.7 0.8 0.8 - 0.5 - 0.5 - 0.5 - 0.5 0.5 1 1.2 1 1 .2 - 0.8 - 1.0 - 0.8 - 1.0 TYP MAX 0.2 UNIT V V mV V V mA mA mA mA mA mA mA mA
II
Bus input current
switching characteristics, VCC = 5 V, TA = 25C
PARAMETER tPHL tPLH tsk(p) tt Propagation delay time, high- to low-level output Propagation delay time, low- to high-level output Pulse skew ( tPHL - tPLH ) Transition time TEST CONDITIONS VID = -1.5 V to 1.5 V, 15 15V See Figure 4 See Figure 4 MIN 15 15 3 3 TYP MAX 30 30 6 5 UNIT ns ns ns ns
PARAMETER MEASUREMENT INFORMATION
Y RL 2 VOD RL 2 Z VOC
D 0 V or 3 V
Figure 1. Differential and Common-Mode Output Voltage Test Circuit
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
PARAMETER MEASUREMENT INFORMATION
Vtest R1 375 Y D 0 V or 3 V RL = 60 VOD
Z R2 375 Vtest
- 7 V < Vtest < 12 V
Figure 2. Differential Output Voltage Test Circuit
3V Input td(ODH) Output tt(OD) TEST CIRCUIT VOLTAGE WAVEFORMS 50% 1.5 V 1.5 V 0V td(ODL) 2.5 V 50% - 2.5 V tt(OD)
Generator (see Note A)
50
RL = 54
CL = 50 pF Output (see Note B)
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 Circuits and Differential Output Delay and Transition Time Voltage Waveforms
3V Input A Generator (see Note A) 50 1.5 V CL = 15 pF (see Note B) Output 90% 1.3 V 10% tt TEST CIRCUIT VOLTAGE WAVEFORMS 90% 1.3 V 10% tt B Output tPLH 1.5 V 1.5 V 0V tPHL VOH
VOL
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. Receiver Test Circuit and Propagation Delay and Transition Time Voltage Waveforms
6
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
TYPICAL CHARACTERISTICS
DRIVER DRIVER
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
5 VOH - High-Level Output Voltage - V 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 10 20 30 40 50 60 70 80 90 100 IOH - High-Level Output Current - mA VCC = 5 V TA = 25C 5 4.5 VOL- Low-Level Output Voltage - V 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 5
DRIVER
Figure 6
DRIVER
DIFFERENTIAL OUTPUT VOLTAGE vs OUTPUT CURRENT
4 3.5 VOD - Differential Output Voltage - V 3 2.5 2 1.5 1 0.5 0 VCC = 5 V TA = 25C VOD - Differential Output Voltage - V 2.5 3
DIFFERENTIAL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE
VCC = 5 V Load = 54 VIH = 2 V
2
1.5
1
0.5
0
10
20
30 40 50 60 70 80 IO - Output Current - mA
90
100
0 - 50
- 25
0 25 50 75 100 TA - Free-Air Temperature - C
125
Figure 7
Figure 8
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
TYPICAL CHARACTERISTICS
DRIVER RECEIVER
DIFFERENTIAL DELAY TIME vs FREE-AIR TEMPERATURE
20 VCC = 5 V Load = 54 t d(OD) - Differential Delay Times - ns td(ODL) 6
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
VID = 200 mV VOH - High-Level Output Voltage - V 125 5
15
4
td(ODH) 10
3
2
5
1
0 - 50
0 - 25 100 50 75 0 25 TA - Free-Air Temperature - C 0 - 40 -10 - 20 - 30 IOH - High-Level Output Current - mA - 50
Figure 9
RECEIVER
Figure 10
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
1 0.9 VOL - Low-Level Output Voltage - V 0.8 0.7 4 0.6 0.5 0.4 0.3 0.2 0.1 0 0 5 10 15 20 25 35 30 IOL - Low-Level Output Current - mA 40 VO - Output Voltage - V VCC = 5 V TA = 25C VID = - 200 mV 6
OUTPUT VOLTAGE vs DIFFERENTIAL INPUT VOLTAGE
5 VIC = 12 V VIC = 0 V 3
2 VIC = -7 V 1
0 - 80 - 60
- 40
- 20
0
20
40
60
80
VID - Differential Input Voltage - mV
Figure 11
Figure 12
8
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
TYPICAL CHARACTERISTICS
RECEIVER
AVERAGE SUPPLY CURRENT vs FREQUENCY
60 55 I CC - Average Supply Current - mA 50 45 40 I I - Input Current - mA 35 30 25 20 15 10 5 0 10 K 100 K 1M f - Frequency - Hz 10 M 100 M 0.4 0.2 0 - 0.2 - 0.4 - 0.6 - 0.8 Receiver Load = 50 pF Driver Load = Receiver Inputs 1 0.8 0.6
INPUT CURRENT vs INPUT VOLTAGE (COMPLEMENTARY INPUT AT 0 V)
-1 -8
Figure 13
RECEIVER
PROPAGATION DELAY TIME vs FREE-AIR TEMPERATURE
24.5 VCC = 5 V CL = 15 pF VIO = 1.5 V
t pd - Propagation Delay Time - ns
24 tPHL 23.5
23 tPLH 22.5
22 - 40
- 20
0
20
40
TA - Free-Air Temperature - C
Figure 15
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IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII IIIIIIIIIIIII
TA = 25C VCC = 5 V The shaded region of this graph represents more than 1 unit load per RS-485. -2 0 2 4 6 8 10 -6 -4 12 VI - Input Voltage - V
Figure 14
60
80
100
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
MECHANICAL INFORMATION
D (R-PDSO-G**)
14 PIN SHOWN PINS ** DIM 0.020 (0,51) 0.014 (0,35) 14 8 A MIN 0.244 (6,20) 0.228 (5,80) 0.157 (4,00) 0.150 (3,81) 0.008 (0,20) NOM 0.189 (4,80) 0.337 (8,55) 0.386 (9,80) 0.010 (0,25) M A MAX
PLASTIC SMALL-OUTLINE PACKAGE
0.050 (1,27)
8 0.197 (5,00)
14 0.344 (8,75)
16 0.394 (10,00)
1 A
7
Gage Plane
0.010 (0,25) 0- 8 0.044 (1,12) 0.016 (0,40)
Seating Plane 0.069 (1,75) MAX 0.010 (0,25) 0.004 (0,10) 0.004 (0,10) 4040047 / D 10/96 NOTES: A. B. C. D. All linear dimensions are in inches (millimeters). This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15). Falls within JEDEC MS-012
10
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SN75LBC179, SN65LBC179, SN65LBC179Q LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173D - JANUARY 1994 - REVISED JUNE 2000
MECHANICAL INFORMATION
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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Copyright (c) 2000, Texas Instruments Incorporated

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