SP488ACP [SIPEX]
High Speed Quad RS-485/RS-422 Line Receivers; 高速四路RS - 485 / RS - 422线路接收器
| 型号： | SP488ACP |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | High Speed Quad RS-485/RS-422 Line Receivers |
| 文件： | 总7页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SP488A and SP489A
High Speed Quad
RS-485/RS-422 Line Receivers
■ High Speed Versions of Sipex's
SP488 & SP489
■ 30Mbps Transmission Rates
■ Quad Differential Line Receivers
■ RS-485 or RS-422 Applications
■ Tri–state Output Control
■ 30ns Typical Receiver Propagation
Delays
■ –7V to +12V Common Mode Input
Range
■ 1mA Supply Current
■ Single +5V Supply Operation
■ Pin Compatible with SN75173,
SN75175, LTC488 and LTC489
DESCRIPTION…
The SP488A and SP489A are high speed quad differential line receivers capable of
meeting the RS-485 and RS-422 protocols while running at five times the normal
transmission rates. The SP488A and SP489A are enhanced versions of Sipex's SP488
and SP489 quad RS-485/RS-422 line receivers. The SP488A features a common
receiver enable control; the SP489A provides independent receiver enable controls for each
pair of receivers. Both feature tri–state outputs and wide common–mode input range.
The receivers have a fail–safe feature which forces a logic “1” output when receiver inputs
are left floating. Both are available in 16–pin plastic DIP and SOIC packages.
RI1B
RI1A
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
RI1B
RI1A
RO1
EN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
RI4B
RI4A
RO4
EN
SP489A
4
SP488A
4
RI4B
RI4A
RO4
1
1
RO1
EN1/EN2
RO2
EN3/EN4
RO3
RO2
RI2A
RI2B
GND
2
RI2A
2
RO3
RI3A
RI3B
3
RI2B
RI3A
RI3B
3
GND
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation 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)
Receiver ............................................................................... ±14V
Receiver Output Voltage ................................. –0.5V to (VCC +0.5V)
Input Currents
Logic .................................................................................. ±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
EN, EN, EN1/EN2, EN3/EN4
0.8
Volts
Volts
µA
VIH
2.0
Input Current
±2
0V ≤ VIN ≤ VCC
RECEIVER INPUTS
Input Resistance
Differential Input Threshold
Input Current (A, B)
12
-0.2
kOhm
Volts
–7V ≤ VCM ≤ 12V
–7V ≤ VCM ≤ 12V
VCC = 0V or 5.25V; IIN2
VIN = +12V
+0.2
+1.0
-0.8
mA
mA
VIN = –7V
Maximum Data Rate
30
Mbps
RECEIVER OUTPUTS
Output Voltage
VOH
VOL
3.5
V
V
µA
IO = –4mA; VID = +0.2V
IO = +4mA; VID = –0.2V
EN = O, EN = VCC, EN1/EN2 = O,
EN3/EN4 = O, 0.4V ≤ VO ≤ 2.4V
0.4
+1
High Impedance Output Current
POWER REQUIREMENTS
Supply Voltage
4.75
5.25
Volts
Supply Current
TBD
mA
No load
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
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
2
AC PARAMETERS
VCC = 5V±5%; typicals at 25°C; 0°C ≤ TA ≤ +70°C unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Receiver Input to Output
CL = 15pF; Figure 1, 3
Low to HIGH (tPLH
High to LOW (tPHL
Differential Receiver Skew (tSKD
Receiver Rise Time (tR)
SP488A
)
)
TBD
TBD
TBD
ns
ns
ns
)
10% to 90%
90% to 10%
TBD
TBD
ns
ns
SP489A
Receiver Fall Time (tF)
SP488A
TBD
TBD
ns
ns
SP489A
RECEIVER ENABLE
To Output HIGH
TBD
TBD
ns
ns
CL = 15pF; Figures 2 and 4
(S2 closed)
CL = 15pF; Figures 2 and 4
(S1 closed)
To Output LOW
RECEIVER DISABLE
From Output LOW
TBD
TBD
ns
ns
CL = 15pF; Figures 2 and 4
(S1 closed)
CL = 15pF; Figures 2 and 4
(S2 closed)
From Output HIGH
F = 1MHZ: tr < 10ns: tf < 10ns
0V
+VOD
Input A–B
0V
–VOD
tPHL
tPLH
VOH
VOL
RO
1.5V
1.5V
Figure 1. Receiver Propagation Delays
F = 1MHZ: tr < 10ns: tf < 10ns
1.5V
3V
EN
1.5V
0V
tZL
tLZ
5V
RO
1.5V
0.5V
0.5V
VOL
Output normally low
tZH
tHZ
Output normally high
1.5V
VOH
0V
RO
Figure 2. Receiver Enable/Disable Timing
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
3
PINOUT
RI1B
RI1A
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
RI1B
RI1A
RO1
EN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
RI4B
RI4A
RO4
EN
SP488A
4
SP489A
4
RI4B
RI4A
RO4
1
1
RO1
EN1/EN2
RO2
RO2
RI2A
RI2B
GND
EN3/EN4
RO3
2
2
RO3
RI3A
RI3B
RI2A
3
3
RI2B
RI3A
RI3B
GND
SP488A PINOUT
Pin 1 — RI1B — Receiver 1 input B.
Pin 9 — RI3B — Receiver 3 input B.
Pin 10 — RI3A — Receiver 3 input A.
Pin 2 — RI1A — Receiver 1 input A.
Pin 3 — RO1 — Receiver 1 Output — If Re-
ceiver 1 output is enabled, if RI1A > RI1B by
200mV, Receiver output is high. If Receiver 1
outputisenabled, andifRI A<RI1B by200mV,
Receiver 1 output is low.1
Pin 11 — RO3 — Receiver 3 Output — If
Receiver 3 output is enabled, if RI A > RI3B by
200mV, Receiver 3 output is high.3If Receiver 3
output is enabled, and if RI3A < RI3B by
200mV, Receiver 3 output is low.
Pin 4 — EN — Receiver Output Enable. Please
Pin12—EN—ReceiverOutputEnable. Please
refer to SP488A Truth Table (1).
refer to SP488A Truth Table (1).
Pin 5 — RO2 — Receiver 2 Output — If Re-
ceiver 2 output is enabled, if RI2A > RI2B by
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI2A < RI2B by
200mV, Receiver 2 output is low.
Pin 13 — RO4 — Receiver 4 Output — If
Receiver 4 output is enabled, if RI A > RI4B by
200mV, Receiver 4 output is high.4If Receiver 4
output is enabled, and if RI4A < RI4B by
200mV, Receiver 4 output is low.
Pin 6 — RI2A — Receiver 2 input A.
Pin 7 — RI2B — Receiver 2 input B.
Pin 8 — GND — Digital Ground.
Pin 14 — RI4A — Receiver 4 input A.
Pin 15 — RI4B — Receiver 4 input B.
Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC
≤
5.25V.
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
4
50pF
EN
S1
S2
1kΩ
A
VCC
DRIVER
RCVR
ROn
CL
CL
DI
54Ω
1kΩ
B
50pF
EN
1/4 SP486
1/4 SP488
Figure 4. Enable/Disable Timing Test Circuit
Figure 3. Timing Test Circuit
SP489A PINOUT
Pin 9 — RI3B — Receiver 3 input B.
Pin 10 — RI3A — Receiver 3 input A.
Pin 1 — RI1B — Receiver 1 input B.
Pin 2 — RI1A — Receiver 1 input A.
Pin 11 — RO3 — Receiver 3 Output — If
Receiver 3 output is enabled, if RI A > RI3B by
200mV, Receiver 3 output is high.3If Receiver 3
output is enabled, and if RI3A < RI3B by
200mV, Receiver 3 output is low.
Pin 3 — RO1 — Receiver 1 Output — If Re-
ceiver 1 output is enabled, if RI > RI1B by
200mV, Receiver output is high.1IAf Receiver 1
outputisenabled, andifRI A<RI1B by200mV,
Receiver 1 output is low.1
Pin 12 — EN3/EN4 — Receiver 3 and 4 Output
Pin 4 — EN1/EN2 — Receiver 1 and 2 Output
Enable. Please refer to SP489A Truth Table (2).
Enable. Please refer to SP489A Truth Table (2).
Pin 13 — RO4 — Receiver 4 Output — If
Receiver 4 output is enabled, if RI A > RI4B by
200mV, Receiver 4 output is high.4If Receiver 4
output is enabled, and if RI4A < RI4B by
200mV, Receiver 4 output is low.
Pin 5 — RO2 — Receiver 2 Output — If Re-
ceiver 2 output is enabled, if RI2A > RI2B by
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI2A < RI2B by
200mV, Receiver 2 output is low.
Pin 14 — RI4A — Receiver 4 input A.
Pin 15 — RI4B — Receiver 4 input B.
Pin 6 — RI2A — Receiver 2 input A.
Pin 7 — RI2B — Receiver 2 input B.
Pin 8 — GND — Digital Ground.
Pin 16 — Supply Voltage VCC — 4.75V ≤ VCC
≤
5.25V.
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
5
DIFFERENTIAL
A – B
ENABLES
EN
OUTPUT
RO
DIFFERENTIAL
A – B
ENABLES
EN /EN or EN /EN
4
OUTPUT
RO
EN
1
2
3
V
ID ≥ 0.2V
H
X
X
L
H
H
V
≥ 0.2V
H
H
H
L
H
X
ID
–0.2V < V < +0.2V
ID
–0.2V < VID < +0.2V
H
X
X
L
X
X
V
≤ 0.2V
L
ID
V
ID ≤ 0.2V
H
X
X
L
L
L
X
Hi–Z
Table 2. SP489A Truth Table
X
L
H
Hi–Z
Table 1. SP488A Truth Table
FEATURES…
The SP488A and SP489A are low–power quad
differential line receivers meeting RS-485 and
RS-422 serial protocol. The SP488A and
SP489A feature Sipex's BiCMOS process
allowing low power operational characteristics
of CMOS technology while meeting all of the
demands of the RS-485 and RS-422 serial
protocols over 10Mbps under load in harsh
environments. Infact, theSP488AandSP489A
can transmit signals up to 30Mbps.
Normally an RS-485 driver will produce no less
than 1.5V before cable attenuation. After cable
loss, the signal may degrade and have an
amplitude of less than 1.0V. The receiver input
sensitivity of the SP488A and SP489A allows
the devices to receive signals as low as 200mV.
The SP488A features active high and active
low common receiver enable controls; the
SP489A provides independent, active high
receiver enable controls for each pair of
receivers. Both feature tri–state outputs and
a -7V to +12V common–mode input range
permitting a ±7V ground difference between
devices on the communications bus. The
SP488A/489A are equipped with a fail–safe
feature which forces a logic high at the
receiver output when the input is left floating.
Both are available in 16-pin plastic DIP and
SOIC packages.
The RS-485 standard is ideal for multi-drop
applications and for long-distance communica-
tion. RS-485 allows up to 32 drivers and 32
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-485 transceivers are equipped with a wide
(-7V to +12V) common mode range to
accommodate ground potential differences.
Because RS-485 is a differential interface,
data is virtually immune to noise in the
transmission line.
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
6
ORDERING INFORMATION
Quad RS485 Receivers:
Model ........................ Enable/Disable ...................................... Temperature Range........................ Package
SP488ACP ............... Common; active Low and Active High .. 0°C to +70°C ....................16–pin Plastic DIP
SP488ACT................ Common; active Low and Active High .. 0°C to +70°C ............................. 16–pin SOIC
SP488AEP................ Common; active Low and Active High .. –40°C to +85°C ................16–pin Plastic DIP
SP488AET ................ Common; active Low and Active High .. –40°C to +85°C ......................... 16–pin SOIC
SP489ACP ............... One per driver pair; active High ............ 0°C to +70°C ....................16–pin Plastic DIP
SP489ACT................ One per driver pair; active High ............ 0°C to +70°C ............................. 16–pin SOIC
SP489AEP................ One per driver pair; active High ............ –40°C to +85°C ................16–pin Plastic DIP
SP489AET ................ 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.
SP488A/489ADS/07
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
7
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