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MAX1490BEPG+ maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1490BEPG+ maxim 美信芯片 电子元器件中文版规格手册
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_________________General Description
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B are complete, electrically isolated, RS-485/
RS-422 data-communications interface solutions in a
hybrid microcircuit. Transceivers, optocouplers, and a
transformer provide a complete interface in a standard
DIP package. A single +5V supply on the logic side pow-
ers both sides of the interface.
The MAX1480B/MAX1480C/MAX1490B feature reduced-
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission at data rates up to 250kbps.
The MAX1480A/MAX1490A driver slew rate is not limited,
allowing transmission rates up to 2.5Mbps. The
MAX1480A/B/C are designed for half-duplex communi-
cation, while the MAX1490A/B feature full-duplex com-
munication.
Drivers are short-circuit current limited and protected
against excessive power dissipation by thermal shut-
down circuitry that places the driver outputs into a high-
impedance state. The receiver input has a fail-safe
feature that guarantees a known output (RO low for the
MAX1480A/B/C, RO high for the MAX1490A/B) if the
input is open circuit.
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600V
RMS
(1 minute) or
2000V
RMS
(1 second). Their isolated outputs meet all
RS-485/RS-422 specifications. The MAX1480A/B/C are
available in a 28-pin DIP package, and the MAX1490A/B
are available in a 24-pin DIP package.
________________________Applications
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
Next-Generation Device Features
♦♦
For Integrated ESD Protection
MAX1480E/MAX1490E: ±15kV ESD-Protected,
Isolated RS-485/RS-422 Data Interfaces
♦♦
For Space-Constrained Applications
MAX3157: High CMRR, RS-485 Transceiver with
±50V Isolation
MAX1480A/B/C/MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
________________________________________________________________
Maxim Integrated Products
1
1
24
23
22
21
20
19
18
17
2
3
4
5
6
7
8
AC1
AC2
ISO V
CC1
ISO RO DRVD2
D1
A
B
Z
Y
SD
FS
GND1
16
15
14
13
9
10
11
12
ISO COM1
ISO DI DRV
ISO V
CC2
ISO RO LED
GND2
RO
DI
DIP
V
CC2
V
CC3
V
CC4
V
CC1
MAX1490A/B
MAX845
MAX488
MAX490
TOP VIEW
ISOLATION BARRIER
Pin Configurations
19-0259; Rev 5; 5/05
_______________Ordering Information
Ordering Information continued at end of data sheet.
†
Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and
“C” parts is up to 250kbps.
Pin Configurations continued at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART
†
TEMP RANGE PIN-PACKAGE
MAX1480ACPI 0°C to +70°C
28 Wide Plastic DIP
MAX1480AEPI -40°C to +85°C
28 Wide Plastic DIP
_____________________Selection Table
PART
HALF/
FULL
DUPLEX
DATA
RATE
(MBPS)
SLEW-
RATE
LIMITED
DRIVER
ENABLE
TIME
(µs)
MAX1480A Half 2.5 No 0.2
MAX1480B Half 0.25 Yes 35
MAX1480C Half 0.25 Yes 0.5
MAX1490A Full 2.5 No —
MAX1490B Full 0.25 Yes —
Complete, Isolated RS-485/RS-422
Data Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC_
= 5V ±10%, V
FS
= V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.) (Notes 1, 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
With Respect to GND_
Supply Voltage (V
CC_
)...........................................-0.3V to +6V
Control Input Voltage (SD, FS)...............-0.3V to (V
CC_
+ 0.3V)
Receiver Output Voltage (RO, RO)........-0.3V to (V
CC_
+ 0.3V)
Output Switch Voltage (D1, D2)........................................+12V
With Respect to ISO COM_
Control Input Voltage (ISO DE_ ) ....-0.3V to (ISO V
CC_
+ 0.3V)
Driver Input Voltage (ISO DI_ ) .......-0.3V to (ISO V
CC_
+ 0.3V)
Receiver Output Voltage (ISO RO_)
...-0.3V to (ISO V
CC_
+ 0.3V)
Driver Output Voltage (A, B, Y, Z ) ......................-8V to +12.5V
Receiver Input Voltage (A, B)..............................-8V to +12.5V
LED Forward Current (DI, DE, ISO RO LED) ......................50mA
Continuous Power Dissipation (T
A
= +70°C)
24-Pin Plastic DIP (derate 8.7mW°C above +70°C) .....696mW
28-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW
Operating Temperature Ranges
MAX1480_CPI/MAX1490_CPG............................0°C to +70°C
MAX1480_EPI/MAX1490_EPG .........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX1480A/B/C/MAX1490A/B
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
f
SWL
V
FS
= 0V 535
Switch Frequency
f
SWH
FS = V
CC_
or open 725
kHz
R
L
= ∞, +25°C only 60 90
MAX1480A,
DE´ = V
CC_
or open
R
L
= 54Ω 120
R
L
= ∞, +25°C only 35 45
MAX1480B,
DE´ = V
CC_
or open
R
L
= 54Ω 95
R
L
= ∞, +25°C only 35 75
MAX1480C,
DE´ = V
CC_
or open
R
L
= 54Ω 95
R
L
= ∞, +25°C only 100 150
MAX1490A
R
L
= 54Ω 170
R
L
= ∞, +25°C only 65 125
Operating Supply Current I
CC
MAX1490B
R
L
= 54Ω 130
mA
Shutdown Supply Current
(Note 3)
I
SHDN
SD = V
CC_
0.2 µA
V
SDH
High 2.4
Shutdown Input Threshold
V
SDL
Low 0.8
V
Shutdown Input Leakage Current 10 pA
V
FSH
High 2.4
FS Input Threshold
V
FSL
Low 0.8
V
FS Input Pullup Current FS low 50 µA
FS Input Leakage Current FS high 10 pA
Input High Voltage V
IH
DE´, DI´ V
CC_
- 0.4 V
Input Low Voltage V
IL
DE´, DI´ 0.4 V
Isolation Resistance R
ISO
T
A
= +25°C, V
ISO
= 50VDC 100 10,000 MΩ
Isolation Capacitance C
ISO
T
A
= +25°C, V
ISO
= 50VDC 10 pF
Differential Driver Output
(No Load)
V
OD1
8V
MAX1480A/B/C/MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R = 50Ω (RS-422) 2
Differential Driver Output
(With Load)
V
OD2
R = 27Ω (RS-485), Figure 4 1.5 5.0
V
Differential 0.3
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
ΔV
OD
R = 27Ω or 50Ω,
Figure 4
Common mode 0.3
V
Driver Common-Mode Output
Voltage
V
OC
R = 27Ω or 50Ω, Figure 4 4 V
MAX1480A/B/C 1
V
IN
= 12V
MAX1490A/B 0.25
MAX1480A/B/C 0.8
Input Current (A, B) ISO I
IN
DE´ = 0V,
V
CC_
= 0V
or 5.5V
V
IN
= -7V
MAX1490A/B 0.2
mA
MAX1480A/B/C 48
Receiver Input Resistance R
IN
-7V ≤ V
CM
≤ 12V
MAX1490A/B 12
kΩ
Receiver Differential Threshold
Voltage
V
TH
-7V ≤ V
CM
≤ 12V -0.2 +0.2 V
Receiver Input Hysteresis ΔV
TH
V
CM
= 0V 70 mV
Receiver Output/Receiver Output
Low Voltage
V
OL
Using resistor values listed in
Tables 1 and 2
0.4 V
Receiver Output/Receiver Output
High Current
I
OH
V
OUT
= 5.5V 250 µA
Driver Short-Circuit Current ISO I
OSD
-7V ≤ V
O
≤ 12V (Note 4) 100 mA
ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= 5V ±10%, V
FS
= V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.) (Notes 1, 2)
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(V
CC_
= 5V ±10%, FS = V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
PLH
100 275
Driver Input to Output
Propagation Delay
t
PHL
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
100 275
ns
Driver Output Skew t
SKEW
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
25 90 ns
Driver Rise or Fall Time t
R,
t
F
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
15 40 ns
Driver Enable to Output High
(MAX1480A Only)
t
ZH
Figures 6 and 8, C
L
= 100pF, S2 closed 0.2 1.5 µs
Driver Enable to Output Low
(MAX1480A Only)
t
ZL
Figures 6 and 8, C
L
= 100pF, S1 closed 0.2 1.5 µs
Driver Disable Time from Low
(MAX1480A Only)
t
LZ
Figures 6 and 8, C
L
= 15pF, S1 closed 0.2 1.5 µs
Driver Disable Time from High
(MAX1480A Only)
t
HZ
Figures 6 and 8, C
L
= 15pF, S2 closed 0.2 1.5 µs
t
PLH
100 225
Receiver Input to Output
Propagation Delay
t
PHL
Figures 5 and 10, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
100 225
ns
MAX1480A/B/C/MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
4 _______________________________________________________________________________________
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A (continued)
(V
CC_
= 5V ±10%, FS = V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
|t
PLH
- t
PHL
| Differential Receiver
Skew
t
SKD
Figures 5 and 10, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
20 ns
Maximum Data Rate f
MAX
t
PLH
, t
PHL
< 50% of data period 2.5 Mbps
Time to Shutdown t
SHDN
100 µs
Shutdown to Driver Output High t
ZH
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S2 closed 3 10 µs
Shutdown to Driver Output Low t
ZL
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S1 closed 3 10 µs
SWITCHING CHARACTERISTICS—MAX1480B/MAX1480C/MAX1490B
(V
CC_
= 5V ±10%, FS = V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
PLH
2 3.0
Driver Input to Output
Propagation Delay
t
PHL
Figures 5 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
2 3.0
µs
Driver Output Skew t
SKEW
Figures 5 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
900 1600 ns
Driver Rise or Fall Time t
R,
t
F
Figures 5 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
1.0 2.0 µs
Driver Enable to Output High
(MAX1480B Only)
t
ZH
Figures 6 and 8, C
L
= 100pF, S2 closed 35 100 µs
Driver Enable to Output Low
(MAX1480B Only)
t
ZL
Figures 6 and 8, C
L
= 100pF, S1 closed 35 100 µs
Driver Disable Time from Low
(MAX1480B Only)
t
LZ
Figures 6 and 8, C
L
= 15pF, S1 closed 13 50 µs
Driver Disable Time from High
(MAX1480B Only)
t
HZ
Figures 6 and 8, C
L
= 15pF, S2 closed 13 50 µs
Driver Enable to Output High
(MAX1480C Only)
t
ZH
Figures 6 and 8, C
L
= 100pF, S2 closed 0.5 4.5 µs
Driver Enable to Output Low
(MAX1480C Only)
t
ZL
Figures 6 and 8, C
L
= 100pF, S1 closed 0.5 4.5 µs
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
_______________________________________________________________________________________ 5
Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to logic-
side ground (GND_), unless otherwise specified.
Note 2: For DE´ and DI´ pin descriptions, see
Detailed Block Diagram and Typical Application Circuit
(Figure 1 for MAX1480A/
MAX1480B/MAX1480C, Figure 2 for MAX1490A/MAX1490B).
Note 3: Shutdown supply current is the current at V
CC1
and V
CC2
when shutdown is enabled.
Note 4: Applies to peak current (see
Typical Operating Characteristics
). Although the MAX1480A/B/C and MAX1490A/B provide
electrical isolation between logic ground and signal paths, they do not provide isolation between external shields and the
signal paths (see
Isolated Common Connection
section).
SWITCHING CHARACTERISTICS—MAX1480B/MAX1480C/MAX1490B (continued)
(V
CC_
= 5V ±10%, FS = V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Disable Time from Low
(MAX1480C Only)
t
LZ
Figures 6 and 8, C
L
= 15pF, S1 closed 2.0 4.5 µs
Driver Disable Time from High
(MAX1480C Only)
t
HZ
Figures 6 and 8, C
L
= 15pF, S2 closed 2.0 4.5 µs
t
PLH
2 3.0
Receiver Input to Output
Propagation Delay
t
PHL
Figures 5 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
2 3.0
µs
|t
PLH
- t
PHL
| Differential Receiver
Skew
t
SKD
Figures 5 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
1200 ns
Maximum Data Rate f
MAX
t
PLH
, t
PHL
< 50% of data period 0.25 Mbps
Time to Shutdown t
SHDN
100 µs
Shutdown to Driver Output High t
ZH
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S2 closed 35 100 µs
Shutdown to Driver Output Low t
ZL
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S1 closed 35 100 µs
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