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ADM3491-1 데이터시트 PDF




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부품번호 ADM3491-1 기능
기능 EIA RS-485 Transceiver
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ADM3491-1 데이터시트, 핀배열, 회로
Data Sheet
FEATURES
Operates with 3.3 V supply
EIA RS-422 and RS-485 compliant over full CM range
19 kΩ input impedance
Up to 50 transceivers on bus
20 Mbps data rate
Short-circuit protection
Specified over full temperature range
Thermal shutdown
Interoperable with 5 V logic
840 μA supply current
2 nA shutdown current
Available in PDIP, SOIC, and TSSOP
Meets IEC1000-4-4 (>1 kV)
8 ns skew
Upgrade for MAX3491, SN75ALS180
3.3 V, Full-Duplex, 840 μA,
20 Mbps, EIA RS-485 Transceiver
ADM3491-1
FUNCTIONAL BLOCK DIAGRAM
ADM3491-1
RO R
RE
A
B
DE
DI D
Z
Y
Figure 1.
APPLICATIONS
Telecommunications
DTE–DCE interface
Packet switching
Local area networks
Data concentration
Data multiplexers
Integrated services digital network (ISDN)
AppleTalk
Industrial controls
GENERAL DESCRIPTION
The ADM3491-1 is a low power, differential line transceiver
designed to operate using a single 3.3 V power supply. Low
power consumption, coupled with a shutdown mode, makes it
ideal for power-sensitive applications. It is suitable for commu-
nication on multipoint bus transmission lines.
The ADM3491-1 is intended for balanced data transmission
and complies with both Electronic Industries Association (EIA)
Standards RS-485 and RS-422. It contains a differential line
driver and a differential line receiver, making it suitable for full-
duplex data transfer.
The input impedance is 19 kΩ, allowing up to 50 transceivers to
be connected on the bus. A thermal shutdown circuit prevents
excessive power dissipation caused by bus contention or by
output shorting. This feature forces the driver output into a high
impedance state if a significant temperature increase is detected
in the internal driver circuitry during fault conditions.
If the inputs are unconnected (floating), the receiver contains a
fail-safe feature that results in a logic high output state.
The ADM3491-1 is fabricated on BiCMOS, an advanced mixed
technology process combining low power CMOS with fast
switching bipolar technology.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1998–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADM3491-1 pdf, 반도체, 판매, 대치품
ADM3491-1
TIMING SPECIFICATIONS
VCC = 3.3 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
DRIVER
Differential Output Delay, TDD
Differential Output Transition Time
Propagation Delay Input to Output, TPLH, TPHL
Driver Output to Output, TSKEW
ENABLE/DISABLE
Driver Enable to Output Valid
Driver Disable Timing
Driver Enable from Shutdown
RECEIVER
Time to Shutdown
Propagation Delay Input to Output, TPLH, TPHL
Skew, TPLH – TPHL
Receiver Enable, TEN
Receiver Disable, TDEN
Receiver Enable from Shutdown
Data Sheet
Min Typ Max Unit
1 35 ns
1 8 15 ns
7
22 35
ns
8 ns
45 90
ns
40 80
ns
65 110 ns
80 190 300 ns
25 65 90
ns
10 ns
25 50
ns
25 45
ns
500 ns
Test Conditions/ Comments
RL = 60 Ω, CL1 = CL2 = 15 pF, see Figure 18
RL = 60 Ω, CL1 = CL2 = 15 pF, see Figure 18
RL = 27 Ω, CL1 = CL2 = 15 pF, see Figure 19
RL = 54 Ω, CL1 = CL2 = 15 pF, see Figure 19
RL = 110 Ω, CL = 50 pF, see Figure 16
RL = 110 Ω, CL = 50 pF, see Figure 16
RL = 110 Ω, CL = 15 pF, see Figure 16
CL = 15 pF, see Figure 21
CL = 15 pF, see Figure 21
CL = 15 pF, see Figure 17
CL = 15 pF, see Figure 17
CL = 15 pF, see Figure 17
VCC = 3.3 V ± 0.3 V, TA = TMIN to TMAX, unless otherwise noted.
Table 3.
Parameter
DRIVER
Differential Output Delay, TDD
Differential Output Transition Time
Propagation Delay Input to Output, TPLH, TPHL
Driver Output to Output, TSKEW
ENABLE/DISABLE
Driver Enable to Output Valid
Driver Disable Timing
Driver Enable from Shutdown
RECEIVER
Time to Shutdown
Propagation Delay Input to Output, TPLH, TPHL
Skew, TPLH – TPHL
Receiver Enable, TEN
Receiver Disable, TDEN
Receiver Enable from Shutdown
Min Typ Max Unit
1 70 ns
2 8 15 ns
7
22 70
ns
10 ns
45 110 ns
40 110 ns
65 110 ns
50 190 500 ns
25 65 115 ns
20 ns
25 50
ns
25 50
ns
600 ns
Test Conditions/Comments
RL = 60 Ω, CL1 = CL2 = 15 pF, see Figure 18
RL = 60 Ω, CL1 = CL2 = 15 pF, see Figure 18
RL = 27 Ω, CL1 = CL2 = 15 pF, see Figure 19
RL = 54 Ω, CL1 = CL2 = 15 pF, see Figure 19
RL = 110 Ω, CL = 50 pF, see Figure 16
RL = 110 Ω, CL = 50 pF, see Figure 16
RL = 110 Ω, CL = 15 pF, see Figure 16
CL = 15 pF, see Figure 21
CL = 15 pF, see Figure 21
CL = 15 pF, see Figure 17
CL = 15 pF, see Figure 17
CL = 15 pF, see Figure 17
Rev. C | Page 4 of 16

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ADM3491-1 전자부품, 판매, 대치품
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
14
12
10
8
6
4
2
0 0 0.5
1 1.5 2 2.5
OUTPUT VOLTAGE (V)
3 3.5
Figure 4. Output Current vs. Receiver Output Low Voltage
0.8
0.7
0.6
0.5
0.4 IRO = 2.5mA
0.3
0.2
0.1
0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80
Figure 5. Receiver Output Low Voltage vs. Temperature
100
120
100
80
60
40
20
0
0 0.5
1 1.5
2 2.5
DIFFERENTIAL O/P VOLTAGE (V)
3
Figure 6. Output Current vs. Driver Differential Output Voltage
ADM3491-1
14
12
10
8
6
4
2
0
0 0.5 1 1.5 2 2.5 3 3.5
OUTPUT HIGH VOLTAGE (V)
Figure 7. Output Current vs. Receiver Output High Voltage
4
3.3
3.25
3.2
3.15
IRO = –1.5mA
3.1
3.05
3–40 –20 0 20 40 60 80
TEMPERATURE (°C)
Figure 8. Receiver Output High Voltage vs. Temperature
100
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6–40
–20
0 20 40 60
TEMPERATURE (°C)
80 100
Figure 9. Driver Differential Output Voltage vs. Temperature
Rev. C | Page 7 of 16

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ADM3491-1

EIA RS-485 Transceiver

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