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MAX1480CEPI
Datasheet
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Maxim MAX1490BEPG, MAX1490AEPG, MAX1490ACPG, MAX1480CEPI, MAX1480CCPI Datasheet

...
_________________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 pow­ers both sides of the interface.
The MAX1480B/MAX1480C/MAX1490B feature reduced­slew-rate drivers that minimize EMI and reduce reflec­tions 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 communi­cation, while the MAX1490A/B feature full-duplex com­munication.
Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shut­down circuitry that places the driver outputs into a high­impedance 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/C) 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
____________________________Features
♦ Isolated Data Interface, Typically to 1600V
RMS
(1 minute)
♦ Slew-Rate Limited for Errorless Data
Transmission (MAX1480B/MAX1480C/MAX1490B)
♦ High-Speed, Isolated, 2.5Mbps RS-485/RS-422
Interface (MAX1480A/MAX1490A)
♦ Full-Duplex Data Communication (MAX1490A/B) ♦ -7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
♦ Single +5V Supply ♦ Current Limiting and Thermal Shutdown for
Driver Overload Protection
♦ Standard 0.6" DIP Package:
28-Pin DIP (MAX1480A/B/C) 24-Pin DIP (MAX1490A/B)
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 2a; 2/98
PART
†
MAX1480ACPI MAX1480AEPI -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
28 Wide Plastic DIP 28 Wide Plastic DIP
_______________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.
PART
MAX1480A MAX1480B
MAX1490A
HALF/
FULL
DUPLEX
Half Half
Full
_____________________Selection Table
MAX1490B Full
DATA RATE
(Mbps)
2.5
0.25
2.5
SLEW-
RATE
LIMITED
No
Yes
No
0.25 Yes
DRIVER
ENABLE
TIME
(µs)
0.2 35
— —
Pin Configurations continued at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX1480C 0.25Half Yes 0.5
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422 Data Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC_
= 5V ±10%, VFS= V
CC_
, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and TA= +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 (TA= +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_CPI..............................0°C to +70°C
MAX1480_EPI/MAX1490_EPI ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
V
FS
= 0V
CONDITIONS
535f
SWL
UNITSMIN TYP MAXSYMBOLPARAMETER
FS = V
CC_
or open 725f
SWH
60 90
MAX1480B, DE´ = V
CC_
or open
35 75
MAX1480A, DE´ = V
CC_
or open
120
35 45
130
Low
V
0.8V
SDL
MAX1480C, DE´ = V
CC_
or open
Shutdown Input Threshold
SD = V
CC_
High
µA0.2I
SHDN
Shutdown Supply Current (Note 3)
2.4V
SDH
95
65 125
High Low
2.4V
FSH
V
0.8V
FSL
FS Input Threshold
DE´, DI´ DE´, DI´
VV
CC_
- 0.4V
IH
Input High Voltage
V0.4V
IL
Input Low Voltage
FS low FS high
µA50FS Input Pull-Up Current pA10FS Input Leakage Current
pA10
Shutdown Input Leakage Current
RL= ∞
RL= 54Ω RL= ∞
RL= ∞ RL= 54Ω
RL= ∞
MAX1490B
RL= 54Ω
TA= +25°C, V
ISO
= 50VDC pF10C
ISO
Isolation Capacitance
TA= +25°C, V
ISO
= 50VDC MΩ100 10,000R
ISO
Isolation Resistance
kHzSwitch Frequency
mAI
CC
Operating Supply Current
RL= ∞ RL= 54Ω
100 150
MAX1490A
170
V8V
OD1
Differential Driver Output (no load)
RL= 54Ω 95
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= 5V ±10%, VFS= V
CC_
, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and TA= +25°C.)
(Notes 1, 2)
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(V
CC_
= 5V ±10%, FS = V
CC_
, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and TA= +25°C.)
R = 50Ω (RS-422) 2
R = 27Ω or 50Ω, Figure 4 V
0.3
∆V
OD
CONDITIONS
Change in Magnitude of Driver Output Voltage for Complementary Output States
R = 27Ω (RS-485), Figure 4
V
1.5 5
V
OD2
Differential Driver Output (with load)
mA
1
R = 27Ω or 50Ω, Figure 4
-7V ≤ VCM≤ 12V VCM= 0V
V-0.2 0.2V
TH
Receiver Differential Threshold
mV70∆V
TH
Receiver Input Hysteresis
V4V
OC
Driver Common-Mode Output
0.25
UNITSMIN TYP MAXSYMBOLPARAMETER
V
OUT
= 5.5V µA250I
OH
Receiver Output/Receiver Output High Current
Using resistor values listed in Tables 1 and 2
-7V ≤ VO≤ 12V (Note 4) mA100ISO I
OSD
Driver Short-Circuit Current
V0.4V
OL
Receiver Output/Receiver Output Low Voltage
Differential Common Mode 0.3
MAX1490A/B MAX1480A/B/C
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF
ns
100 275t
PHL
Driver Input to Output Propagation Delay
ns25 90t
SKEW
CONDITIONS
Driver Output Skew
Figures 5 and 7, R
DIFF
= 54Ω,
CL1= CL2= 100pF
100 275t
PLH
Figures 6 and 8, CL= 100pF, S2 closed
Figures 5 and 10, R
DIFF
= 54Ω, CL1= CL2= 100pF
µs0.2 1.5t
ZH
Driver Enable to Output High (MAX1480A only)
100 225t
PLH
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF
Figures 5 and 10, R
DIFF
= 54Ω, CL1= CL2= 100pF
ns
100 225t
PHL
Receiver Input to Output Propagation Delay
ns20t
SKD
I
t
PLH
- t
PHL
I
Differential
Receiver Skew
ns15 40t
R, tF
Driver Rise or Fall Time
UNITSMIN TYP MAXSYMBOLPARAMETER
Figures 6 and 8, CL= 100pF, S1 closed µs0.2 1.5t
ZL
Driver Enable to Output Low (MAX1480A only)
Figures 6 and 8, CL= 15pF, S2 closed µs0.2 1.5t
HZ
Driver Disable Time from High (MAX1480A only)
Figures 6 and 8, CL= 15pF, S1 closed µs0.2 1.5t
LZ
Driver Disable Time from Low (MAX1480A only)
-7V ≤ VCM≤ 12V kΩ12R
IN
Receiver Input Resistance
MAX1480A/B/C
MAX1490A/B
0.8
ISO I
IN
Input Current (A, B)
0.2
DE´ = 0V, V
CC_
= 0V or 5.5V
VIN= 12V
VIN= -7V
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422 Data Interface
4 _______________________________________________________________________________________
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
(V
CC_
= 5V ±10%, FS = V
CC_
, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and TA= +25°C.)
Figures 6 and 8, CL= 100pF, S1 closed µs35 100t
ZL
Driver Enable to Output Low (MAX1480B only)
Figures 6 and 8, CL= 15pF, S2 closed µs13 50t
HZ
Driver Disable Time from High (MAX1480B only)
Figures 6 and 8, CL= 15pF, S1 closed µs13 50
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF
Mbps
100t
SHDN
t
LZ
Driver Disable Time from Low (MAX1480B only)
Maximum Data Rate
ns100 800t
SKEW
CONDITIONS
Driver Output Skew
Figures 6 and 9, CL= 100pF, S2 closed
t
PLH
, t
PHL
< 50% of data period
µs35 100t
ZH(SHDN)
Shutdown to Driver Output High
Figures 6 and 9, CL= 100pF, S1 closed
2.5f
MAX
µs
Figures 6 and 8, CL= 100pF, S2 closed
Figures 5 and 10, R
DIFF
= 54Ω, CL1= CL2= 100pF
µs35 100t
ZH
Driver Enable to Output High (MAX1480B only)
35 100
0.8 2.0t
PLH
t
ZL(SHDN)
t
PLH
, t
PHL
< 50% of data period
Shutdown to Driver Output Low
Mbps0.25f
MAX
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF
Maximum Data Rate
Figures 5 and 10, R
DIFF
= 54Ω, CL1= CL2= 100pF
µs
0.8 2.0t
PHL
Receiver Input to Output Propagation Delay
ns200t
SKD
I
t
PLH
- t
PHL
I
Differential
Receiver Skew
µs1.0 2.0t
R, tF
Driver Rise or Fall Time
UNITSMIN TYP MAXSYMBOLPARAMETER
µs100t
SHDN
Time to Shutdown
Figures 6 and 8, CL= 100pF, S2 closed µs0.5 4.5t
ZH
Driver Enable to Output High (MAX1480C only)
Figures 6 and 8, CL= 100pF, S1 closed µs0.5 4.5t
ZL
Driver Enable to Output Low (MAX1480C only)
Figures 6 and 8, CL= 15pF, S1 closed µs2.0 4.5t
LZ
Driver Disable Time from Low (MAX1480C only)
Figures 6 and 8, CL= 15pF, S2 closed µs2.0 4.5t
HZ
Driver Disable Time from High (MAX1480C only)
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF
µs
1.0 2.0t
PHL
Driver Input to Output Propagation Delay
Figures 5 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF 1.0 2.0t
PLH
Time to Shutdown µs
Figures 6 and 9, CL= 100pF, S1 closed
µs
3 10t
ZL(SHDN)
Shutdown to Driver Output High Figures 6 and 9, CL= 100pF, S2 closed 3 10t
ZH(SHDN)
Shutdown to Driver Output Low µs
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
_______________________________________________________________________________________
5
0
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
MAX1480/90A/B-01
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
1.5
10
20
30
40
50
60
70
80
MEASURED AT ISO RO DRV
1.00.50 3.53.02.52.0 5.04.54.0
0
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
MAX1480/90A/B-02
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
1.5
-5
MEASURED AT ISO RO DRV
1.00.50 3.53.02.52.0 5.04.54.0
-10
-15
-20
-25
-30
3.00
-40 20
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX1480/90A/B-03
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)
0-20 6040 80
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00 MEASURED AT ISO RO DRV
I
RO
= 8mA
0
-40 20
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX1480/90A/B-04
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
0-20 6040 80
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8 MEASURED AT ISO RO DRV
I
RO
= 8mA
0
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX1480/90A/B-07
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1.5
10
20
30
40
50
60
70
80
DI´ = HIGH OR OPEN
1.00.50 3.53.02.52.0 5.04.54.0
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX1480/90A/B-05
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
0
160
180
140
100
120
80
40
60
0
20
1 2 3 4 5 6 7 8 9 10 11 12
0
-7
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX1480/90A/B-06
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-6 -5 -4 -3 -2 -1 1 2 3 4 5 6
2.0
-40 20
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
MAX1480/90A/B-08
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
0-20 6040 80
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
DI´ = HIGH OR OPEN R
L
= 54Ω
0
-40 20
MAX1480B/MAX1480C/MAX1490B
SHUTDOWN CURRENT vs. TEMPERATURE
MAX1480/90A/B-09
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
0-20 6040 80
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40 SD = V
CC_
, DI´ = V
CC_
DE
´ (MAX1480B/C ONLY) = V
CC_
MEASURED AT V
CC1
AND V
CC2
__________________________________________Typical Operating Characteristics
(V
CC_
= 5V, FS = V
CC_
, TA = +25°C, unless otherwise noted.)
MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422 Data Interface
6 _______________________________________________________________________________________
_____________________________Typical Operating Characteristics (continued)
(V
CC_
= 5V, FS = V
CC_
, TA = +25°C, unless otherwise noted.)
0
60 40 20
80
100
120
140
160
MAX1480A
SUPPLY CURRENT vs. TEMPERATURE
MAX1480/90A/B-10
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 -20 0 20 40 60 80
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
R
L
= 54Ω
R
L
= ∞
V
CC
= 4.5V
DE´ = V
CC
20
60
40
80
100
120
140
MAX1480B
SUPPLY CURRENT vs. TEMPERATURE
MAX1480/90A/B-11
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 -20 0 20 40 60 80
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 5.5V
V
CC
= 5.0V
R
L
= 54Ω
R
L
= ∞
DE´ = V
CC
V
CC
= 4.5V
V
CC
= 4.5V
20
70 60 50
30
40
80
90
100
110
120
MAX1480C
SUPPLY CURRENT vs. TEMPERATURE
MAX1480/90A/B-12
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 -20 0 20 40 60 80
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
R
L
= 54Ω
R
L
= ∞
V
CC
= 4.5V
DE´ = V
CC
80
120
100
140
160
180
200
MAX1490A
SUPPLY CURRENT vs. TEMPERATURE
MAX1480/90A/B-13
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 -20 0 20 40 60 80
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
R
L
= 54Ω
R
L
= ∞
V
CC
= 4.5V
50
100
90 80
60
70
110
120
130
140
150
MAX1490B
SUPPLY CURRENT vs. TEMPERATURE
MAX1480/90A/B-14
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 -20 0 20 40 60 80
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
R
L
= 54Ω
R
L
= ∞
V
CC
= 4.5V
0.1
10
1
100
DRIVER DISABLE TIME
vs. TEMPERATURE
MAX1480/90A/B-15a
TEMPERATURE (°C)
DRIVER DISABLE TIME (µs)
-40 -20 0 20 40 60 80
MAX1480A
MAX1480B
MAX1480C
RL = 54Ω V
DI´
= 0V MEASURED FROM
DE´ TO VALID OUTPUT
0.1
10
1
100
DRIVER ENABLE TIME
vs. TEMPERATURE
MAX1480/90A/B-15b
TEMPERATURE (°C)
DRIVER ENABLE TIME (µs)
-40 -20 0 20 40 60 80
MAX1480A
MAX1480C
MAX1480B
RL = 54Ω V
DI´
= 0V MEASURED FROM
DE´ TO VALID OUTPUT
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