ST485_068 [STMICROELECTRONICS]
Low power RS-485/RS-422 transceiver; 低功耗RS - 485 / RS - 422收发器
| 型号： | ST485_068 |
| 厂家： | 
ST |
| 描述： | Low power RS-485/RS-422 transceiver |
| 文件： | 总19页 (文件大小：307K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ST485
Low power
RS-485/RS-422 transceiver
General features
■ Low quiescent current: 300µA
■ Designed for RS-485 interface application
■ -7V to 12V common mode input voltage range
■ Driver maintains high impedance in 3-state or
with the power OFF
■ 70mV tipycal input hysteresis
■ 30ns propagation delay, 5ns skew
■ Operate from a single 5V supply
DIP-8
SO-8
■ Current limiting and thermal shutdown for
It operates from a single 5V supply.
driver overload protection
■ Allows up to 64 transceivers on the bus
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that placed the driver
outputs into a high-impedance state.
Description
The ST485 is al low power transceiver for RS-485
and RS-422 communication. Each part contains
one driver and one receiver.
The ST485 is designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applciations).
This transceiver draw 300µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
The ST485 is available in three temperature
range: commercial (0°C to 70°C), industrial (-
40°C to 85°C) and automotive (-55°C to 125°C)
Order code
Part number
Temperature range
Package
Packaging
ST485CN
ST485BN
ST485XN
ST485CD
ST485BD
ST485CDR
ST485BDR
ST485XDR
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
0 to 70 °C
DIP-8
DIP-8
50parts per tube / 40tube per box
50parts per tube / 40tube per box
50parts per tube / 40tube per box
100parts per tube / 20tube per box
100parts per tube / 20tube per box
2500 parts per reel
DIP-8
SO-8 (Tube)
SO-8 (Tube)
SO-8 (Tape & reel)
SO-8 (Tape & reel)
SO-8 (Tape & reel)
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
2500 parts per reel
2500 parts per reel
August 2006
Rev 13
1/19
www.st.com
19
Contents
ST485
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
3
4
Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
4.2
Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
6
7
Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
ST485
Pin configuration
1
Pin configuration
Figure 1.
Pin configuration
1.1
Pin description
Table 1.
Pin description
Pin n°
Symbol
Name and function
1
2
3
4
5
RO
RE
Receiver Output
Receiver Output Enable
Driver Output Enable
Driver Input
DE
DI
GND
Ground
Non-inverting Receiver Input and Non-inverting
Driver Output
6
A
7
8
B
Inverting Receiver Input and Inverting Driver Output
Supply Voltage
VCC
3/19
Truth tables
ST485
2
Truth tables
Table 2.
Truth table (driver)
Inputs
Outputs
RE
DE
DI
B
A
X
X
X
H
H
L
H
L
L
H
Z
H
L
X
Z
Note:
X = Don’t care; Z = High impedance
Table 3.
Truth table (receiver)
Inputs
Outputs
RO
RE
DE
A-B
L
L
L
L
≥ +0.2V
≤-0.2V
H
L
L
L
L
INPUTS OPEN
X
H
Z
H
Note:
X = Don’t care; Z = High impedance
4/19
ST485
Maximum ratings
3
Maximum ratings
Table 4.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VCC
VI
Supply Voltage
7
V
Control Input Voltage (RE, DE)
Driver Input Voltage (DI)
Driver Output Voltage (A, B)
Receiver Input Voltage (A, B)
Receiver Output Voltage (RO)
-0.5 to (VCC + 0.5)
-0.5 to (VCC + 0.5)
± ± 14
V
V
V
V
V
VDI
VDO
VRI
VRO
± ± 14
-0.5 to (VCC + 0.5)
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied. V+ and V- can have a maximum
magnitude of +7V, but their absolute addition can not exceed 13 V.
5/19
Electrical characteristics
ST485
4
Electrical characteristics
VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred
to TA = 25°C)
Table 5.
Symbol
DC Electrical characteristics
Value
Parameter
Test conditions (1)
-40 to 85 °C
-55 to 125 °C Unit
Min
Typ Max Min Max
Differential Driver Output
(No Load)
VOD1
VOD2
5
5
V
Differential Driver Output RL = 27Ω± (RS-485) (Figure 2.)
(With Load)
5
5
5
5
V
V
1.5
1.4
RL = 50Ω± (RS-422) (Figure 2.)
Change in Magnitude of
Driver Differential Output
∆VOD Voltage for
Complementary Output
RL = 27Ω± or 50Ω± (Figure 2.)
0.2
3
0.2
3
V
V
V
States
Driver Common-Mode
Output Voltage
VOC
RL = 27Ω± or 50Ω± (Figure 2.)
RL = 27Ω± or 50Ω± (Figure 2.)
Change in Magnitude of
Driver Common-Mode
∆VOC Output Voltage for
Complementary Output
States
0.2
0.2
VIH
VIL
IIN1
Input High Voltage
Input Low Voltage
Input Current
RE, DE, DI
RE, DE, DI
RE, DE, DI
2.0
2.0
V
V
0.8
0.8
± ± 2
± ± 2
µA
V
CM = 0V or 5.25VVDE = 0V
VIN = 12V
IN = -7V
IIN2
Input Current (A, B)
1
-0.8
1
-0.8
mA
mA
V
Receiver Differential
Threshold Voltage
VTH
∆VTH
VOH
VOL
VCM = -7 to 12V
VCM = 0V
-0.2
3.5
0.2
-0.2
3.4
0.2
V
mV
V
Receiver Input
Hysteresis
70
Receiver Output High
Voltage
IO = -4mAVID = 200mV
Receiver Output Low
Voltage
IO = 4mAVID = -200mV
VO = 0.4 to 2.4V
0.4
0.55
V
3-State (High
Impedance) Output
Current at Receiver
IOZR
± ± 1
± ± 1
µA
Receiver Input
Resistance
RIN
VCM = -7 to 12V
24
24
KΩ
6/19
ST485
Electrical characteristics
Value
Table 5.
DC Electrical characteristics
Symbol
Parameter
Test conditions (1)
-40 to 85 °C
-55 to 125 °C Unit
Min
Typ Max Min Max
VRE = 0V or VCC
VDE = VCC
VDE = 0V
No Load Supply Current
ICC
400
300
900
500
900
500
µA
µA
(2)
Driver Short-Circuit
Current, VO=High
(3)
IOSD1
IOSD2
IOSR
VO = -7 to 12V
VO = -7 to 12V
VO = 0V to VCC
35
35
7
250
250
95
35
35
7
250
250
95
mA
mA
mA
Driver Short-Circuit
Current, VO=Low
(3)
Receiver Short-Circuit
Current
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified.
2. Supply current specification is valid for loaded transmitters when V = 0V
DE
3. Applies to peak current. See typical Operating Characteristics.
4.1
Driver switching characteristics
VCC = 5V ± ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred
to TA = 25°C
Table 6.
Symbol
Driver switching characteristics
Value
Parameter
Test conditions (1)
-40 to 85 °C
-55 to 125°C Unit
Min. Typ. Max. Min. Max.
tPLH
tPHL
Propagation Delay
Input to Output
RDIFF = 54ΩCL1 = CL2 = 100pF
10
3
30
5
60
10
40
90
90
90
90
70
10
45
90
90
90
90
ns
ns
ns
ns
ns
ns
ns
(See Figure 4. and Figure 6.)
RDIFF = 54ΩCL1 = CL2 = 100pF
(See Figure 4. and Figure 6.)
tSK
Output Skew to Output
Rise or Fall Time
RDIFF = 54ΩCL1 = CL2 = 100pF
(See Figure 4. and Figure 6.)
tTLH
tTHL
15
70
70
70
70
3
CL = 100pFS2 = Closed
(See Figure 5. and Figure 7.)
tPZH
tPZL
tPLZ
tPHZ
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
CL = 100pFS1 = Closed
(See Figure 5. and Figure 7.)
CL = 15pFS1 = Closed
(See Figure 5. and Figure 7.)
CL = 15pFS2 = Closed
(See Figure 5. and Figure 7.)
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified.
7/19
Electrical characteristics
ST485
4.2
Receiver switching characteristics
VCC = 5V ± ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred
to TA = 25°C)
Table 7.
Symbol
Receiver switching characteristics
Value
Parameter
Test conditions (1)
-40 to 85 °C
-55 to 125°C Unit
Min. Typ. Max. Min. Max.
tPLH
tPHL
Propagation Delay Input RDIFF = 54ΩCL1 = CL2 = 100pF
20
130
13
20
20
20
20
210
230
ns
ns
ns
ns
ns
to Output
(See Figure 4. and Figure 8.)
Differential Receiver
Skew
RDIFF = 54ΩCL1 = CL2 = 100pF
(See Figure 4. and Figure 8.)
tSKD
tPZH
tPZL
tPLZ
CRL = 15pFS1 = Closed
(See Fig. 2 and Figure 9.)
Output Enable Time
Output Enable Time
Output Disable Time
50
50
50
50
56
56
56
56
CRL = 15pFS2 = Closed
(See Fig. 2 and Figure 9.)
CRL = 15pFS1 = Closed
(See Fig. 2 and Figure 9.)
CRL = 15pFS2 = Closed
(See Fig. 2 and Figure 9.)
tPHZ
fMAX
Output Disable Time
Maximum Data Rate
ns
2.5
2.5
Mbps
1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device
ground unless specified
8/19
ST485
Test circuit and typical characteristics
5
Test circuit and typical characteristics
Figure 2.
Driver DC test load
Figure 3.
Receiver timing test load
Figure 4.
Drive/receiver timing test circuit
Figure 5.
Driver timing test load
9/19
Test circuit and typical characteristics
Figure 6. Driver propagation delay
ST485
Figure 7.
Driver enable and disable time
10/19
ST485
Test circuit and typical characteristics
Figure 8.
Receiver propagation delay
Figure 9.
Receiver Enable and Disable Time
11/19
Test circuit and typical characteristics
ST485
Figure 10. Receiver output current vs. output Figure 11. Receiver output current vs. output
low voltage high voltage
Figure 12. Driver output current vs. output low Figure 13. Driver output current vs. output
voltage
high voltage
Figure 14. Supply current vs. temperature
Figure 15. Receiver high level output voltage
vs. temperature
12/19
ST485
Test circuit and typical characteristics
Figure 16. Receiver low level output voltage
vs. temperature
Figure 17. Differential driver output voltage vs.
temperature
13/19
Package mechanical data
ST485
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
14/19
ST485
Package mechanical data
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
a1
B
3.3
0.130
0.7
1.39
0.91
0.028
0.055
0.036
1.65
1.04
0.065
0.041
B1
b
0.5
0.020
b1
D
E
0.38
0.5
9.8
0.015
0.020
0.386
8.8
0.346
0.100
0.300
0.300
e
2.54
7.62
7.62
e3
e4
F
7.1
4.8
0.280
0.189
I
L
3.3
0.130
Z
0.44
1.6
0.017
0.063
P001F
15/19
Package mechanical data
ST485
SO-8 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
MIN.
MAX.
A
A1
A2
B
1.35
0.10
1.10
0.33
0.19
4.80
3.80
1.75
0.053
0.069
0.010
0.065
0.020
0.010
0.197
0.157
0.25
1.65
0.51
0.25
5.00
4.00
0.04
0.043
0.013
0.007
0.189
0.150
C
D
E
e
1.27
0.050
H
5.80
0.25
0.40
6.20
0.50
1.27
0.228
0.010
0.016
0.244
0.020
0.050
h
L
k
˚ (max.)
8
ddd
0.1
0.04
0016023/C
16/19
ST485
Package mechanical data
Tape & Reel SO-8 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
22.4
8.5
5.9
2.3
4.1
8.1
0.882
0.335
0.232
0.090
0.161
0.319
Ao
Bo
Ko
Po
P
8.1
5.5
2.1
3.9
7.9
0.319
0.216
0.082
0.153
0.311
17/19
Revision history
ST485
7
Revision history
Table 8.
Revision history
Revision
Date
Changes
21-Mar-2006
02-Aug-2006
12
13
Order codes has been updated and new template.
Mistake in cover page first row mA ==> µA.
18/19
ST485
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