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Preliminary
SP26LV431
High Speed, +3.3V Quad RS-422 Differential Line Driver
Quad Differential Line Drivers Compatible with the EIA standard for RS-422 serial protocol High-Z Output Control At Least 60Mbps Transmission Rates 11ns Typical Driver Propagation Delays Less than 1ns Typical Output Skew Single +3.3V Supply Operation Common Driver Enable Control Compatibility with the industry standard 26LV31 Ideal For Use with SP26LV432, Quad Receivers
DI1 D01A D01B ENABLE D02B D02A DI2 GND 1 2 3 4 5 6 7 8 SP26LV431 16 VCC 15 DI4 14 D04A 13 D04B 12 ENABLE 11 D0 B 3 10 D0 A 3 9 DI 3
DESCRIPTION The SP26LV431 is a quad differential line driver that meets the specifications of the EIA standard RS-422 serial protocol. The SP26LV431 features Sipex's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-422 serial protocol over 60Mbps under load. The RS-422 protocol allows up to 10 receivers to be connected to a multipoint bus transmission line. The SP26LV431 features a driver enable control common to all four drivers that places the output pins in a high impedance state. Since the cabling can be as long as 4,000 feet, the RS-422 drivers of the SP26LV431 are equipped with a wide common-mode output voltage range to accommodate ground potential differences. TYPICAL APPLICATION CIRCUIT
VCC DI4
ENABLE ENABLE Input NonInverting A Output high-Z LOW HIGH Inverting B Output high-Z HIGH LOW
INPUTS DI3 DI2 DI1
LOW HIGH don't care
HIGH don't care LOW
don't care LOW HIGH
ENABLE ENABLE
DO A DO B DO A DO B DO A DO B DO A DO B 3 4 3 2 2 1 1 4
GND
OUTPUTS
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. VCC........................................................................................0.5V to 7.0V VIN (DC Input Voltage).............................................-1.5V to (VCC + 1.5V) VOUT (DC Output Voltage)......................................................-0.5V to 7V IIK, IOK (Clamp Diode Current)........................................................20mA IOUT (DC Output Current, per pin)................................................150mA ICC (DC VCC or GND Current, per pin)..........................................150mA TSTG (Storage Temperature Range)...............................-65C to +150C Storage Temperature....................................................-65C to +150C Power Dissipation Per Package 16-pin PDIP (derate 14.3mW/oC above +70oC).........................1150mW 16-pin NSOIC (derate 13.6mW/oC above +70oC)......................1100mW
ELECTRICAL CHARACTERISTICS
Unless otherwise noted, the following specifications apply for VCC = +3.0V to +3.6V with Tamb = 25C and all MIN and MAX limits apply across the recommended operating temperature range.
DC PARAMETERS Supply Voltage, VCC DC Input or Output Voltage, VIN or VOUT Input Electrical Characteristics Input Rise or Fall Times, tr or tf HIGH Level Input Voltage, VIH LOW Level Input Voltage, VIL Output Electrical Characteristics HIGH Level Output Voltage, VOH LOW Level Output Voltage, VOL Differential Output Voltage, VT Difference in Differential Output, |VT| - |VT| Common Mode Output Voltage, VOS Difference in Common Mode Output, |VOS -VOS| Quiescent Supply Current ICC Tri-state Output Leakage Current, IOZ 2.0 100 A A VIN = VCC or GND, Note 2 VOUT = VCC or GND, ENABLE = VIL, ENABLE = VIH VIN = VCC or GND, Notes 1 and 3 VCC = 0V, VOUT = 6V, Note 1 VCC = 0V, VOUT = -0.25V, Note 1
(c) Copyright 2004 Sipex Corporation
MIN. TYP. MAX. 3.0 3.6 VCC 3 2.0 0.8
UNITS V V
CONDITIONS
ns V V
2.5
2.9 0.2 0.5
V V V 0.4 3.0 0.4 V V V
VIN = VIH or VIL, IOUT = -20mA VIN = VIH or VIL, IOUT = 20mA RL = 100, Note 1 RL = 100, Note 1 RL = 100, Note 1 RL = 100, Note 1
2.0
2.7
Output Short Circuit Current, ISC Output Leakage Current Power Off IOFF IOFF
Rev: A Date: 3/08/04
-30
-150
mA A A
100 -100
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
2
ELECTRICAL CHARACTARISTICS (continued)
Unless otherwise noted, the following specifications apply for VCC = +3.0V to +3.6V, Tamb = 25C, tr < 6ns, tf < 6ns, and all MIN and MAX limits apply across the recommended operating temperature range.
PARAMETERS SWITCHING CHARACTERISTICS Propagation Delays, tPLHD, tPHLD Skew Differential Ouput Rise and Fall Times, tTLH, tPHL Output Enable Time, tPZH Output Enable Time, tPZL Output Disable Time, tPHZ Output Disable Time, tPLZ Power dissipation Capacitance, CPD Input Capacitance, CIN
MIN. TYP. MAX. UNITS
CONDITIONS
11 0.8 4
18 2 10 40 40 35 35
ns ns ns ns ns ns ns pF pF
Figure 3 Figure 3, Note 4 Figure 3 Figure 5 Figure 5 Figure 5, Note 5 Figure 5, Note 5 Note 6
50 6
NOTE 1: Refer to EIA specifications for RS-422 serial protocol for exact test conditions. NOTE 2: Measured per input. All other inputs at VCC or GND. NOTE 3: This is the current sourced when a high output is shorted to GND. Only one output at a time should be shorted. NOTE 4: Skew is defined as the difference in propagation delays between complementary outputs at the 50% input. NOTE 5: Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times are less than indicated due to the delay added by the RC time constant of the load. NOTE 6: CPD determines the no load dynamic power consumption, PD = (CPDVCC2 f) + (ICCVCC), and the no load dynamic current consumption, IS = (CPDVCCf) + ICC.
VCC DI4
INPUTS DI3 DI2 DI1
ENABLE ENABLE
DO A DO B DO A DO B DO A DO B DO A DO B 3 4 3 2 2 1 1 4
GND
Figure 1. SP431 Block Diagram
OUTPUTS
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
3
AC TEST CIRCUITS AND SWITCHING TIME WAVEFORMS
f=1 MHz tR < 10ns, tF < 10ns 3V DRIVER INPUT DIX 1.5V tPLHD DRIVER D0XB 1.5V tPHLD 0V (Differential) DRIVER D0XA 80% DIFFERENTIAL OUTPUT 20% tTLH 0V VDIFF = VA - VB tTHL 80% 0V 20% 0V VOL GND VOH
CL Generator Driver Enabled DIX 50 D CL CL RL D0XA D0XB
Figure 2. AC Test Circuit
Figure 3. Propagation Delays
VCC
D0XA S1 S2
Test Point S3 110
ENABLE
3V
VCC
1.5V ENABLE Input = ENABLE or ENABLE S1= VCC S2 = D0XA S3 = GND and/or S1 = GND tPLZ S2 = D0XB S3 = GND Input = ENABLE or ENABLE S1= GND S2 = D0XB S3 = VCC and/or S1 = VCC S2 = D0XA S3 = VCC tPHZ VOH = 0.3V
1.5V
0V
tPZH VOH 1.3V GND
D0XB ENABLE ENABLE
CL
tPZL VCC VOL+ 0.3V 1.3V VOL
If ENABLE is the selected input, then ENABLE = HIGH If ENABLE is the selected input, then ENABLE = LOW To force the driver outputs into high-Z, ENABLE = LOW ENABLE = HIGH
Figure 4. Driver Single-Ended TRI-STATE Test Circuit
Figure 5. Driver Single-Ended TRI-STATE Waveforms
3.0V INPUT 0.0V OUTPUT (DIFFERENTIAL) 90% 10% tTLH Input pulse: f = 1MHz, 50% tr < 6ns tf < 6ns tTHL 90% 10%
Figure 6. Differential Rise and Fall Times
Rev: A Date: 3/08/04 SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver (c) Copyright 2004 Sipex Corporation
4
THEORY OF OPERATION The SP26LV431 is a low-power quad differential line driver designed for digital data transmission meeting the specifications of the EIA standard RS-422 serial protocol. The SP26LV431 features Sipex's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-422 serial protocol up to 60Mbps under load in harsh environments. The RS-422 standard is ideal for multi-drop applications and for long-distance communication. The RS-422 protocol allows up to 10 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-422 drivers are equipped with a wide common mode output range to accommodate ground potential differences. Because the RS-422 is a differential interface, data is virtually immune to noise in the transmission line. The SP26LV431 accepts TTL or CMOS input levels and translates these to RS-422 output levels. The SP26LV431 features active HIGH and active LOW driver enable controls common to all four driver channels see Figure 8. A logic HIGH on the ENABLE pin (pin 4) or a logic LOW on the ENABLE pin (pin 12) will enable the differential driver outputs. A logic LOW on the ENABLE pin (pin 4) and a logic HIGH on the ENABLE pin (pin 12) will force the driver outputs into high impedance (high-Z). Refer to the truth table in Figure 8. source and sink current capability. All drivers are internally protected against short circuits on their outputs. The driver outputs are short-circuit limited to 150mA. The driver output skew times are typically 0.8ns. To minimize reflections, the multipoint bus transmission line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible.
ENABLE
ENABLE DATA OUTPUT
DATA
*RT
The RS-422 line driver outputs feature high
*RT is optional although highly recommended to reduce reflection.
Figure 7. Two-Wire Balanced System, RS-422
NonInverting A Output high-Z LOW HIGH Inverting B Output high-Z HIGH LOW
ENABLE
ENABLE
Input
LOW HIGH don't care
HIGH don't care LOW
don't care LOW HIGH
Figure 8. Truth Table, Enable / Disable Function Common to All Four RS-422 Drivers
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
5
12.5 12.0 11.5 VCC = 3.0V tPHLD
12.0
11.5
Differential Prop. Delay (ns)
Differential Prop. Delay (ns)
tPHLD 11.0
11.0 10.5 10.0 9.5 9.0
tPHLD
10.5 tPHLD 10.0
9.5
8.5 8.0 -40 -15 10 35 60 85
9.0 3.0
3.1
3.2
3.3
3.4
3.5
3.6
Temperature (C)
Power Supply Voltage (V)
Figure 9. Differential Propagation Delay vs Temperature
1.25 1.15 1.05 VCC = 3.3V
Figure 10. Differential Propagation Delay vs Voltage
1.8 1.6 1.4
Differential Skew (ns)
0.95 0.85 0.75 0.65 0.55 0.45 0.35 0.25 -40 -15 10 35 60 85
Differential Skew (ns)
1.2 1.0 0.8 0.6 0.4 0.2 0.0 3.0
3.1
3.2
3.3
3.4
3.5
3.6
Temperature (C)
Power Supply Voltage (V)
Figure 11. Differential Skew vs Temperature
Figure 12. Differential Skew vs Voltage
8 VCC = 3.3V 7
5.0
4.5
Differential Transition Time (ns)
Differential Transition Time (ns)
tTHL 4.0 tTLH 3.5
6
5 tTLH 4
3.0
tTHL
3
2.5
2 -40
-15
10
35
60
85
2.0 3.0
3.1
3.2
3.3
3.4
3.5
3.6
Temperature (C)
Power Supply Voltage (V)
Figure 13. Differential Transition Time vs Temperature
Figure 14. Differential Transition Time vs Voltage
Rev: A Date: 3/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporation
6
1.2 Vcc = 3.3V 1.0
0.80
0.75
Complementary Skew (ns)
Complementary Skew (ns)
0.70
0.8
0.65
0.6
0.60
0.4
0.55
0.2 -40
-15
10
35
60
85
0.50 3.0
3.1
3.2
3.3
3.4
3.5
3.6
Temperature (C)
Power Supply Voltage (V)
Figure 15. Complementary Skew vs Temperature
Figure 16. Complementary Skew vs Voltage
3.3 3.1 VCC = 3.3V
3.6
3.2
Differential Output Voltage (V)
Differential Output Voltage (V)
2.9 2.7 2.5 T= -40C 2.3 2.1 T=+25C 1.9 T= +85C 1.7
VCC = 3.6V 2.8 VCC = 3.3V 2.4 VCC = 3.0V 2.0
1.6
1.2
1.5 0 15 30 45 60
0
1
3
4
6
Output Current (mA)
Output Current (mA)
Figure 17. Differential VOUT vs IOUT (Temperature)
Figure 18. Differential VOUT vs IOUT (VCC )
3.3 VCC = 3.3V 3.1
3.6
3.2 VCC = 3.6V
Output High Voltage (V)
Output High Voltage (V)
2.9 T= -40C 2.7 T=+25C 2.5 T= +85C
2.8 VCC = 3.3V 2.4 VCC = 3.0V 2.0
2.3
1.6
2.1 0 1 3 4 6
1.2 0 1 3 4 6
Output High Current (mA)
Output High Current (mA)
Figure 19. VOUT high vs IOUT (Temperature)
Figure 20. VOUT high vs IOUT (VCC )
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
7
0.7 VCC = 3.3V 0.6 0.5 0.4 0.3 0.2 T=+25 T= -40C T= +85C
0.6 VCC = 3.0V 0.5 VCC = 3.3V
Output Low Voltage (V)
Output Low Voltage (V)
0.4 VCC = 3.6V 0.3
0.2
0.1
0.1 0.0 0 1 3 4 6
0.0 0 1 3 4 6
Output Low Current (mA)
Output Low Current (mA)
Figure 21. VOUT low vs Current (Temperature)
Figure 22. VOUT low vs Current (VCC)
2.5 VCC = 3.0V DIN = 3.0V 2.0
3.5 3.0 2.5 2.0 1.5 1.0
Supply Current (A)
1.5
1.0
0.5
Supply Current (uA)
-15 10 35 60 85
0.5
0.0 -40
Temperature (C)
0.0 3.0
3.1
3.2
3.3
3.4
3.5
3.6
Power Supply Voltage (V)
Figure 23. Supply Current vs Temperature
Figure 24. Supply Current vs Voltage
50 VCC = 3.0V 40
104 VCC = 3.0V 102
No Load Supply Current (mA)
1 10 100 1,000 10,000 100,000
No Load Supply Current (mA)
100 98 96 94 92
30
20
10
0
90 1 10 100 1,000 10,000 100,000
Data Rate (kBaud)
Data Rate (kBaud)
Figure 25. Supply Current vs Data Rate
Figure 26. ICC (loaded) vs Data Rate
Rev: A Date: 3/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporation
8
50 Vcc=3.0V 48
65
Output Short Circuit Current (mA)
46 44 42 40 38 36 -40
Output Short Circuit Current (mA)
-15 10 35 60 85
60
55
50
45
40 3.0 3.1 3.2 3.3 3.4 3.5 3.6
Temperature (C)
Power Supply Voltage (V)
Figure 27. Short Circuit Current vs Temperature
Figure 28. Short Circuit Current vs Voltage
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
9
PIN DESCRIPTION
DI1 D01A D01B ENABLE D02B D02A DI2 GND 1 2 3 4 5 6 7 8 SP26LV431 16 VCC 15 DI4 14 D04A 13 D04B 12 ENABLE 11 D0 B 3 10 D0 A 3 9 DI 3
PINOUT
PIN ASSIGNMENTS
PIN NUMBER PIN NAME DESCRIPTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
DI1 D01A D01B ENABLE D02B D02A DI2 GND DI3 D03A D03B ENABLE D04B D04A DI4 VCC
Driver 1 TTL input. Non-inverted driver output. Inverted driver output. Driver output enable, active HIGH. Inverted driver output. Non-inverted driver output. Driver 2 TTL input. Ground. Driver 3 TTL input. Non-inverted driver output. Inverted driver output. Driver output enable, active LOW. Inverted driver output. Non-inverted driver output. Driver 4 TTL input. +3.0V to +3.6V power supply.
Rev: A Date: 3/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporation
10
PACKAGE: 16 Pin PDIP
A1 D A N D1 b3 e b1 b L A2
INDEX AREA
E1 E
123
Dimensions in (mm)
16 PIN PDIP JEDEC MS-001 (BB) Variation MIN NOM MAX .015 .115 .014 .045 .030 .008 .735 .005 .300 .240 .130 .018 .060 .039 .010 .755 .310 .250 .100 BSC .300 BSC .115 .130 .430 .150 .210 .195 .022 .070 .045 .014 .775 .325 .280
E
A A1 A2 b b2 b3 c D D1 E E1 e eA eB L
SEE LEAD DETAIL
c eA eB
b
C
16 pin PDIP
Rev: A Date: 2/08/04 SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver (c) Copyright 2004 Sipex Corporationn
11
PACKAGE: 16 Pin NSOIC
D
A
E/2 E1 E E1/2
SEE VIEW C
1 INDEX AREA (D/2 X E1/2)
e B
b
TOP VIEW
WITH PLATING
O1
b
Gauge Plane L2 Seating Plane
O1
L L1
O
c
VIEW C
BASE METAL
CONTACT AREA
DIMENSIONS Minimum/Maximum (mm)
16 Pin NSOIC
(JEDEC MS-012, AC - VARIATION)
COMMON HEIGHT DIMENSION
A
A2
A1
SIDE VIEW
SYMBOL A A1 A2 b c E E1 e L L1 L2 O O1
MIN NOM MAX 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0 8 5 15
16 PIN NSOIC
Rev: A Date: 3/08/04 SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver (c) Copyright 2004 Sipex Corporation
12
ORDERING INFORMATION
Model .................................................................................... Temperature Range ..................................................................................... Package SP26LV431CP ............................................................................. 0C to +70C ........................................................................... 16-pin Plastic DIP SP26LV431CN ............................................................................ 0C to +70C .......................................................................... 16-pin Narrow SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option.
REVISION HISTORY
DATE 3/08/04 REVISION A DESCRIPTION Production Release.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev: A Date: 2/08/04
SP26LV431 High Speed, +3.3V Quad RS-422 Differential Line Driver
(c) Copyright 2004 Sipex Corporationn
13

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