SP487ECT [SIPEX]
Enhanced Quad RS-485/RS-422 Line Drivers; 增强型四RS - 485 / RS - 422线路驱动器型号: | SP487ECT |
厂家: | SIPEX CORPORATION |
描述: | Enhanced Quad RS-485/RS-422 Line Drivers |
文件: | 总11页 (文件大小:115K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
®
SP486E and SP487E
Enhanced Quad RS-485/RS-422 Line Drivers
■ RS-485 or RS-422 Applications
■ Quad Differential Line Drivers
■ Driver Output Disable
■ –7V to +12V Common Mode Output
Range
■ 100µA Supply Current
■ Single +5V Supply Operation
■ Superior Drop-in Replacement for
SN75172, SN75174, LTC486, and
LTC487
■ Improved ESD Specifications:
+15kV Human Body Model
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
DESCRIPTION…
The SP486E and SP487E are low-power quad differential line drivers that meet the
specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The
ESD tolerance has been improved on these devices to over +15kV for both Human Body
Model and IEC1000-4-2 Air Discharge Method. These devices are superior drop-in replace-
ments to Sipex's SP486 and SP487 devices as well as popular industry standards. As with
the original versions, the SP486E features a common driver enable control and the SP487E
provides independent driver enable controls for each pair of drivers. Both feature wide
common-mode input ranges. Both are available in 16-pin plastic DIP and SOIC packages.
DI1
DO1A
DO1B
EN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
DI1
DO1A
DO1B
EN1/EN2
DO2B
DO2A
DI2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
SP486E
4
SP487E
4
1
1
DI4
DI4
DO4A
DO4B
EN
DO4A
DO4B
EN3/EN4
DO3B
DO3A
DI3
DO2B
DO2A
DI2
DO3B
DO3A
DI3
2
2
3
3
GND
GND
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Thesearestressratingsonlyandfunctionaloperation
of the device at these 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.
VCC .................................................................. +7V
Input Voltages
Logic....................................–0.5V to (VCC +0.5V)
Drivers ................................. –0.5V to (VCC +0.5V)
Driver Output Voltage ................................... +14V
Input Currents
Logic........................................................ +25mA
Driver....................................................... +25mA
Storage Temperature ................. –65°C to +150°C
Power Dissipation
Plastic DIP .............................................. 375mW
(derate 7mW/°C above +70°C)
Small Outline .......................................... 375mW
(derate 7mW/°C above +70°C)
Lead Temperature (soldering, 10 sec) ......... 300°C
SPECIFICATIONS
VCC = 5V±5%; typicals at 25°C; TMIN ≤ TA ≤ TMAX unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
DC CHARACTERISTICS
Digital Inputs
Voltage
VIL
DI, EN, EN, EN1/EN2, EN3/EN4
0.8
+2
Volts
Volts
µA
VIH
2.0
Input Current
V = 0V to V
IN CC
DRIVER OUTPUTS
Differential Voltage
VCC
Volts
Volts
Volts
Volts
IO = 0; unloaded
2
1.5
RL = 50Ω(RS-422)
RL = 27Ω (RS-485); Fig. 1
RL = 27Ω or 50Ω ; Fig. 1
2
VCC
0.2
Change in Output Magnitude
for Complementary Output State
Common Mode Output Voltage
Change in Common Mode Output Magnitude
for Complementary Output State
2.3
3
0.2
Volts
Volts
RL = 27Ω or 50Ω; Fig. 1
RL = 27Ω or 50Ω; Fig. 1
RL = 50Ω (RS-422)
RL = 27Ω (RS-485)
Maximum Data Rate
10
Mbps
Short–circuit Current
VOH
VOL
+250
+250
+200
mA
mA
µA
–7V ≤VO ≤ +12V
–7V ≤VO ≤ +12V
VO = –7V to +12V
High Impedance Output Current
+2
POWER REQUIREMENTS
Supply Voltage
Supply Current
4.75
5.00
0.5
5.25
10
Volts
mA
No load, output enabled
No load, output disabled
0.5
10
µA
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
–C
–E
0
–40
–65
+70
+85
+150
°C
°C
°C
Storage Temperature
Package
–_P
16–pin Plastic DIP
16–pin SOIC
–_T
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
2
PINOUT — SP486E
DI1
DO1A
DO1B
EN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
SP486E
4
S1
S2
1
DI4
VCC
500 ohms
OUTPUT
UNDER TEST
DO4A
DO4B
EN
CL
DO2B
DO2A
DI2
DO3B
DO3A
DI3
2
Figure 3. Driver Timing Test Load
3
GND
Pin 8 — GND — Digital Ground.
Pin 9 — DI3 — Driver 3 Input — If Driver 3
output is enabled, logic 0 on DI3 forces driver
output DO3A low and DO3B high. A logic 1 on
DI3 with Driver 3 output enabled forces driver
DO3A high and DO3B low.
SP486E PINOUT
Pin 1 — DI1 — Driver 1 Input — If Driver 1
output is enabled, logic 0 on DI1 forces driver
output DO1A low and DO1B high. A logic 1 on
DI1 with Driver 1 output enabled forces driver
DO1A high and DO1B low.
Pin 10 — DO3A — Driver 3 output A.
Pin 11 — DO3B — Driver 3 output B.
Pin 2 — DO1A — Driver 1 output A.
Pin 3 — DO1B — Driver 1 output B.
Pin 12 — EN — Driver Output Disable. Please
refer to SP486E Truth Table (1).
Pin 4 — EN — Driver Output Enable. Please
refer to SP486E Truth Table (1).
Pin 13 — DO4B — Driver 4 output B.
Pin 14 — DO4A — Driver 4 output A.
Pin 5 — DO2B — Driver 2 output B.
Pin 6 — DO2A — Driver 2 output A.
Pin 15 — DI — Driver 4 Input — If Driver 4
output is ena4bled, logic 0 on DI4 forces driver
output DO4A low and DO4B high. A logic 1 on
DI4 with Driver 3 output enabled forces driver
DO4A high and DO4B low.
Pin 7 — DI2 — Driver 2 Input — If Driver 2
output is enabled, logic 0 on DI2 forces driver
output DO2A low and DO2B high. A logic 1 on
DI2 with Driver 2 output enabled forces driver
DO2A high and DO2B low.
Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC
5.25V.
≤
A
EN
CL1
R
A
VDO
DRIVER
RDIFF
DI
R
VOC
B
CL2
B
EN
Figure 2. Driver Timing Test
Figure 1. Driver DC Test Load
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
3
PINOUT — SP487E
INPUT
DI
ENABLES
OUTPUTS
EN
EN
X
OUTA
OUTB
DI1
DO1A
DO1B
EN1/EN2
DO2B
DO2A
DI2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
SP487E
4
H
L
H
H
X
X
L
H
L
L
H
1
DI4
X
DO4A
DO4B
EN3/EN4
DO3B
DO3A
DI3
H
L
L
H
L
L
L
H
X
H
Hi–Z
Hi–Z
Table 1. SP486E Truth Table
2
3
GND
Pin 11 — DO3B — Driver 3 output B.
Pin 12 — EN3/EN4 — Driver 3 and 4 Output
Enable. Please refer to SP487E Truth Table (2).
SP487E PINOUT
Pin 1 — DI1 — Driver 1 Input — If Driver 1
output is enabled, logic 0 on DI1 forces driver
output DO1A low and DO1B high. A logic 1 on
DI1 with Driver 1 output enabled forces driver
DO1A high and DO1B low.
Pin 13 — DO4B — Driver 4 output B.
Pin 14 — DO4A — Driver 4 output A.
Pin 15 — DI — Driver 4 Input — If Driver 4
output is ena4bled, logic 0 on DI4 forces driver
output DO4A low and DO4B high. A logic 1 on
DI4 with Driver 3 output enabled forces driver
DO4A high and DO4B low.
Pin 2 — DO1A — Driver 1 output A.
Pin 3 — DO1B — Driver 1 output B.
Pin 4 — EN1/EN2 — Driver 1 and 2 Output
Enable. Please refer to SP487E Truth Table (2).
Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC
≤
5.25V.
Pin 5 — DO2B — Driver 2 output B.
Pin 6 — DO2A — Driver 2 output A.
FEATURES…
The SP486E and SP487E are low–power quad
differential line drivers meeting RS-485 and
RS-422 standards. The SP486E features active
high and active low common driver enable
controls; the SP487E provides independent,
active high driver enable controls for each pair
of drivers. The driver outputs are short–circuit
limited to 200mA. Data rates up to 10Mbps are
supported. Both are available in 16–pin plastic
DIP and SOIC packages.
Pin 7 — DI2 — Driver 2 Input — If Driver 2
output is enabled, logic 0 on DI2 forces driver
output DO2A low and DO2B high. A logic 1 on
DI2 with Driver 2 output enabled forces driver
DO2A high and DO2B low.
Pin 8 — GND — Digital Ground.
Pin 9 — DI3 — Driver 3 Input — If Driver 3
output is enabled, logic 0 on DI3 forces driver
output DO3A low and DO3B high. A logic 1 on
DI3 with Driver 3 output enabled forces driver
DO3A high and DO3B low.
INPUT
DI
ENABLES
OUTPUTS
EN1/EN2 or EN3/EN4 OUTA
OUTB
L
H
L
H
H
L
H
L
H
Pin 10 — DO3A — Driver 3 output A.
X
Hi–Z
Hi–Z
Table 2. SP487E Truth Table
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
4
F = 1MHZ: tr < 10ns: tf < 10ns
1.5V
3V
0V
DI
1.5V
tPLH
tPHL
B
A
VO
21VO
21VO
VDIFF = V(A) – V(B)
VO
90%
10%
90%
10%
–VO
tr
tf
Figure 4. Driver Propagation Delays
AC PARAMETERS
VCC = 5V±5%; typicals at 25°C; TAMB = 25°C unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Driver Input to Output
RDIFF = 54 Ohms, CL1= CL2=
100pF; Figure 2
Low to High (tPLH
High to Low (tPHL
Differential Skew (tSKEW
Driver Rise Time (tR)
SP486E
)
)
20
20
40
40
5
60
60
15
ns
ns
ns
)
tSKEW = tPLH - tPHL
10% to 90%
20
20
ns
ns
SP487E
Driver Fall Time (tF)
SP486E
90% to 10%
20
20
ns
ns
SP487E
DRIVER ENABLE
To Output High
60
60
110
115
ns
ns
CL = 100pF; Figures 3 and 5
(S2 closed)
CL = 100pF; Figures 3 and 5
(S1 closed)
To Output Low
DRIVER DISABLE
From Output Low
60
60
130
130
ns
ns
CL = 15pF; Figures 3 and 5
(S1 closed)
CL = 15pF; Figures 3 and 5
(S2 closed)
From Output High
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
5
F = 1MHZ: tr < 10ns: tf < 10ns
1.5V
3V
0V
EN
1.5V
tZL
tLZ
VC
C
A, B
VO
2.3V
0.5V
0.5V
VOL
Output normally low
Output normally high
2.3V
VOH
0V
tZH
tHZ
Figure 5. Driver Enable/Disable Timing
R
R
S
S
R
R
C
C
SW2
SW2
SW1
SW1
Device
Under
Test
DC Power
Source
C
C
S
S
Figure 6. ESD Test Circuit for Human Body Model
CCoonnttaacctt--DDiisscchhaarrggee MMoodduullee
R
R
R
R
S
S
R
R
V
V
C
C
SW2
SW2
SW1
SW1
Device
Under
Test
DC Power
Source
C
C
S
S
R
R
and R add up to 330Ω for IEC1000-4-2.
and R add up to 330Ω for IEC1000-4-2.
S
S
V
V
Figure 7. ESD Test Circuit for IEC1000-4-2
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
6
ESD TOLERANCE
The SP486E and SP487E devices incorporate
ruggedized ESD cells on all driver output and
receiver input pins. The ESD structure is
improved over our previous family for more
rugged applications and environments sensitive
to electro-static discharges and associated
transients. The improved ESD tolerance is at
least +15kV without damage nor latch-up.
30A
15A
0A
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7
b) IEC1000-4-2 Air-Discharge
c) IEC1000-4-2 Direct Contact
t=0ns
t=30ns
t ➙
Figure 8. ESD Test Waveform for IEC1000-4-2
The Human Body Model has been the generally
acceptedESDtestingmethodforsemiconductors.
This method is also specified in MIL-STD-883,
Method 3015.7 for ESD testing. The premise of
this ESD test is to simulate the human body’s
potential to store electro-static energy and
discharge it to an integrated circuit. The
simulation is performed by using a test model as
showninFigure6. ThismethodwilltesttheIC’s
capability to withstand an ESD transient during
normal handling such as in manufacturing areas
where the ICs tend to be handled frequently.
With the Air Discharge Method, an ESD voltage
is applied to the equipment under test (EUT)
throughair. Thissimulatesanelectricallycharged
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he or she even touches the system.
This energy, whether discharged directly or
through air, is predominantly a function of the
discharge current rather than the discharge
voltage. Variables with an air discharge such as
approach speed of the object carrying the ESD
potential to the system and humidity will tend to
change the discharge current. For example, the
rise time of the discharge current varies with the
approach speed.
The IEC-1000-4-2, formerly IEC801-2, is
generallyusedfortestingESDonequipmentand
systems. For system manufacturers, they must
guarantee a certain amount of ESD protection
since the system itself is exposed to the outside
environment and human presence. The premise
with IEC1000-4-2 is that the system is required
to withstand an amount of static electricity when
ESD is applied to points and surfaces of the
equipmentthatareaccessibletopersonnelduring
normal usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC1000-4-2 is shown on Figure 7. There are
two methods within IEC1000-4-2, the Air
Discharge method and the Contact Discharge
method.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
devised to reduce the unpredictability of the
ESD arc. The discharge current rise time is
constant since the energy is directly transferred
without the air-gap arc. In situations such as
handheldsystems,theESDchargecanbedirectly
dischargedtotheequipmentfromapersonalready
holdingtheequipment. Thecurrentistransferred
ontothekeypadortheserialportoftheequipment
directly andthentravelsthroughthePCBandfinally
to the IC.
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
7
The circuit model in Figures 6 and 7 represent
the typical ESD testing circuit used for all three
methods. TheCS isinitiallychargedwiththeDC
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch(SW2)isonwhileSW1switchesoff. The
voltage stored in the capacitor is then applied
throughRS, thecurrentlimitingresistor, ontothe
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
The higher C value and lower RS value in the
IEC1000-4-2Smodel are more stringent than the
HumanBodyModel. Thelargerstoragecapacitor
injects a higher voltage to the test point when
SW2 is switched on. The lower current limiting
resistor increases the current charge onto the test
point.
Forthe HumanBodyModel, the current limiting
resistor (RS) and the source capacitor (CS) are
1.5kWan100pF,respectively. ForIEC-1000-4-2,
the current limiting resistor (RS) and the source
capacitor (CS) are 330W an 150pF, respectively.
DEVICE PIN
TESTED
HUMAN BODY
MODEL
IEC1000-4-2
Air Discharge Direct Contact
Level
Driver Outputs
Receiver Inputs
+15kV
+15kV
+15kV
+15kV
+8kV
+8kV
4
4
Table 3. Transceiver ESD Tolerance Levels
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
8
PACKAGE: PLASTIC
DUAL–IN–LINE
(NARROW)
E1
E
D1 = 0.005" min.
(0.127 min.)
A1 = 0.015" min.
(0.381min.)
D
A = 0.210" max.
(5.334 max).
C
A2
Ø
L
B1
B
e = 0.300 BSC
A
e = 0.100 BSC
(2.540 BSC)
(7.620 BSC)
ALTERNATE
END PINS
(BOTH ENDS)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
16–PIN
0.115/0.195
(2.921/4.953)
A2
0.014/0.022
(0.356/0.559)
B
0.045/0.070
B1
C
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.780/0.800
(19.812/20.320)
D
0.300/0.325
(7.620/8.255)
E
0.240/0.280
E1
L
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0°/ 15°
(0°/15°)
Ø
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
9
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(WIDE)
E
H
D
A
Ø
A1
L
e
B
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
16–PIN
A
A1
B
D
E
0.093/0.104
(2.352/2.649)
0.004/0.012
(0.102/0.300)
0.013/0.020
(0.330/0.508)
0.398/0.413
(10.10/10.49)
0.291/0.299
(7.402/7.600)
e
0.050 BSC
(1.270 BSC)
H
L
0.394/0.419
(10.00/10.64)
0.016/0.050
(0.406/1.270)
Ø
0°/8°
(0°/8°)
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
10
ORDERING INFORMATION
Quad RS485 Drivers:
Model .................................. Enable/Disable ........................ Temperature Range ......................... Package
SP486ECP ....... Common; active Low and Active High ............ 0°C to +70°C ..................16–pin Plastic DIP
SP486ECT........ Common; active Low and Active High ............ 0°C to +70°C ........................... 16–pin SOIC
SP486EEP........ Common; active Low and Active High .......... –40°C to +85°C................16–pin Plastic DIP
SP486EET ........ Common; active Low and Active High .......... –40°C to +85°C......................... 16–pin SOIC
SP487ECP ............ One per driver pair; active High ................. 0°C to +70°C ..................16–pin Plastic DIP
SP487ECT............. One per driver pair; active High ................. 0°C to +70°C ........................... 16–pin SOIC
SP487EEP............. One per driver pair; active High ............... –40°C to +85°C................16–pin Plastic DIP
SP487EET ............. One per driver pair; active High ............... –40°C to +85°C......................... 16–pin SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Co rp o ra tio n
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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 hereing; neither does it convey any license under its patent rights nor the rights of others.
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
11
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