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Электронный компонент: ISL8487

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1
FN6050.2
ISL8487, ISL81483, ISL81487
1/8 Unit Load, 5V, Low Power, High Speed
or Slew Rate Limited, RS-485/RS-422
Transceivers
These Intersil RS-485/RS-422 devices are "fractional" unit
load (UL), BiCMOS, 5V powered, single transceivers that
meet both the RS-485 and RS-422 standards for balanced
communication. Unlike competitive devices, this Intersil
family is specified for 10% tolerance supplies (4.5V to 5.5V).
The ISL81483 and ISL81487 present a 1/8 unit load to the
RS-485 bus, which allows up to 256 transceivers on the
network for large node count systems (e.g., process
automation, remote meter reading systems). The 1/4 UL
ISL8487 allows up to 128 transceivers on the bus. In a
remote utility meter reading system, individual (apartments
for example) utility meter readings are routed to a
concentrator via an RS-485 network, so the high allowed
node count minimizes the number of repeaters required to
network all the meters. Data for all meters is then read out
from the concentrator via a single access port, or a wireless
link.
Slew rate limited drivers on the ISL8487 and ISL81483
reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications. Data rates up to
250kbps are achievable with these devices.
Data rates up to 5Mbps are achievable by using the
ISL81487, which features higher slew rates.
Receiver (Rx) inputs feature a "fail-safe if open" design,
which ensures a logic high Rx output if Rx inputs are
floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
These half duplex devices multiplex the Rx inputs and Tx
outputs to allow transceivers with Rx and Tx disable
functions in 8 lead packages.
Features
Fractional Unit Load Allows up to 256 Devices on the Bus
Specified for 10% Tolerance Supplies
Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
High Data Rate Version (ISL81487). . . . . . . up to 5Mbps
Slew Rate Limited Versions for Error Free Data
Transmission (ISL8487, ISL81483) . . . . . . .up to 250kbps
Low Current Shutdown Mode (Except ISL81487) . . . 1nA
Low Quiescent Supply Current:
- ISL8487, ISL81483. . . . . . . . . . . . . . . . . . 120
A (Max.)
- ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 300
A (Max.)
-7V to +12V Common Mode Input Voltage Range
Three State Rx and Tx Outputs
30ns Propagation Delays, 5ns Skew (ISL81487)
Half Duplex Pinouts
Operate from a Single +5V Supply (10% Tolerance)
Current Limiting and Thermal Shutdown for driver
Overload Protection
Drop-In Replacements for: MAX487 (ISL8487); MAX1483
(ISL81483); MAX1487, LMS1487 (ISL81487)
Applications
High Node Count Networks
Automated Utility Meter Reading Systems
Factory Automation
Security Networks
Building Environmental Control Systems
Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
HALF/FULL
DUPLEX
NO. OF DEVICES
ALLOWED ON BUS
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
RECEIVER/
DRIVER ENABLE?
QUIESCENT
I
CC
(
A)
LOW POWER
SHUTDOWN?
PIN
COUNT
ISL8487
Half
128
0.25
Yes
Yes
100
Yes
8
ISL81483
Half
256
0.25
Yes
Yes
100
Yes
8
ISL81487
Half
256
5
No
Yes
250
No
8
Data Sheet
December 2003
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Pinout
ISL8487, ISL81483, ISL81487 (PDIP, SOIC)
TOP VIEW
Ordering Information
PART NO.
(BRAND)
TEMP.
RANGE (
o
C)
PACKAGE
PKG. DWG. #
ISL8487IB
(8487IB)
-40 to 85
8 Ld SOIC
M8.15
ISL8487IP
-40 to 85
8 Ld PDIP
E8.3
ISL81483IB
(81483IB)
-40 to 85
8 Ld SOIC
M8.15
ISL81483IP
-40 to 85
8 Ld PDIP
E8.3
ISL81487IB
(81487IB)
-40 to 85
8 Ld SOIC
M8.15
ISL81487IP
-40 to 85
8 Ld PDIP
E8.3
NOTE: SOIC also available in Tape and Reel; Add "-T" to suffix.
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
B/Z
A/Y
GND
D
R
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z *
High-Z *
*Shutdown Mode for ISL8487, ISL81483 (see Note 7)
RECEIVING
INPUTS
OUTPUT
RE
DE
A-B
RO
0
0
+0.2V
1
0
0
-0.2V
0
0
0
Inputs Open
1
1
0
X
High-Z *
1
1
X
High-Z
*Shutdown Mode for ISL8487, ISL81483 (see Note 7)
Pin Descriptions
PIN
FUNCTION
RO
Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
DE
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.
DI
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
GND
Ground connection.
A/Y
RS-485/422 level, noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1.
B/Z
RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1.
V
CC
System power supply input (4.5V to 5.5V).
ISL8487, ISL81483, ISL81487
3
Typical Operating Circuits
ISL8487, ISL81483, ISL81487
0.1
F
+
D
R
7
6
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
0.1
F
+
D
R
6
7
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
R
T
R
T
ISL8487, ISL81483, ISL81487
4
Absolute Maximum Ratings
Thermal Information
V
CC
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
Input/Output Voltages
A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
Short Circuit Duration
Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating
HBM (Per MIL-STD-883, Method 3015.7) . . . . . . . . . . . . . . >7kV
Operating Conditions
Temperature Range
ISL8XXXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
Thermal Resistance (Typical, Note 1)
JA
(
o
C/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
170
8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . .
140
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
CC
= 5V, T
A
= 25
o
C,
(Note 2)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
Driver Differential V
OUT
(no load)
V
OD1
Full
-
-
V
CC
V
Driver Differential V
OUT
(with load)
V
OD2
R = 50
(RS-422), (Figure 1)
Full
2
3
-
V
R = 27
(RS-485), (Figure 1)
Full
1.5
2.3
5
V
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output States
V
OD
R = 27
or 50
, (Figure 1)
Full
-
0.01
0.2
V
Driver Common-Mode V
OUT
V
OC
R = 27
or 50
, (Figure 1)
Full
-
-
3
V
Change in Magnitude of Driver
Common-Mode V
OUT
for
Complementary Output States
V
OC
R = 27
or 50
, (Figure 1)
Full
-
0.01
0.2
V
Logic Input High Voltage
V
IH
DE, DI, RE
Full
2
-
-
V
Logic Input Low Voltage
V
IL
DE, DI, RE
Full
-
-
0.8
V
Logic Input Current
I
IN1
DE, DI, RE
Full
-2
-
2
A
Input Current (A/Y, B/Z), (Note 10)
(ISL81483, ISL81487)
I
IN2
DE = 0V, V
CC
= 4.5 to
5.5V
V
IN
= 12V
Full
-
-
140
A
V
IN
= -7V
Full
-
-
-120
A
I
IN2
DE = 0V, V
CC
= 0V
V
IN
= 12V
Full
-
-
180
A
V
IN
= -7V
Full
-
-
-100
A
Input Current (A/Y, B/Z), (Note 11)
(ISL8487 Only)
I
IN2
DE = 0V, V
CC
= 0V, or
4.5 to 5.5V
V
IN
= 12V
Full
-
-
250
A
V
IN
= -7V
Full
-
-
-100
A
Receiver Differential Threshold
Voltage
V
TH
-7V
V
CM
12V
Full
-0.2
-
0.2
V
Receiver Input Hysteresis
V
TH
V
CM
= 0V
25
-
70
-
mV
Receiver Output High Voltage
V
OH
I
O
= -4mA, V
ID
= 200mV
Full
3.5
-
-
V
Receiver Output Low Voltage
V
OL
I
O
= -4mA, V
ID
= 200mV
Full
-
-
0.4
V
Three-State (high impedance)
Receiver Output Current
I
OZR
0.4V
V
O
2.4V
Full
-
-
1
A
ISL8487, ISL81483, ISL81487
5
Receiver Input Resistance
R
IN
-7V
V
CM
12V
ISL81483, ISL81487
Full
96
-
-
k
ISL8487
Full
48
-
-
k
No-Load Supply Current, (Note 3)
I
CC
ISL81487, DI, RE = 0V
or V
CC
DE = V
CC
Full
-
300
500
A
DE = 0V
Full
-
250
300
A
ISL8487, ISL81483, DI,
RE = 0V or V
CC
DE = V
CC
Full
-
150
200
A
DE = 0V
Full
-
100
120
A
Shutdown Supply Current
I
SHDN
(Note 7), DE = 0V, RE = V
CC
, DI = 0V or V
CC
Full
-
1
50
nA
Driver Short-Circuit Current,
V
O
= High or Low
I
OSD1
DE = V
CC
, -7V
V
Y
or V
Z
12V, (Note 4)
Full
35
-
250
mA
Receiver Short-Circuit Current
I
OSR
0V
V
O
V
CC
Full
7
-
85
mA
SWITCHING CHARACTERISTICS (ISL81487)
Driver Input to Output Delay
t
PLH
, t
PHL
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
18
24
50
ns
Driver Output Skew
t
SKEW
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
-
2
10
ns
Driver Differential Rise or Fall Time
t
R
, t
F
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
3
12
25
ns
Driver Enable to Output High
t
ZH
C
L
= 100pF, SW = GND, (Figure 3)
Full
-
14
70
ns
Driver Enable to Output Low
t
ZL
C
L
= 100pF, SW = V
CC
, (Figure 3)
Full
-
14
70
ns
Driver Disable from Output High
t
HZ
C
L
= 15pF, SW = GND, (Figure 3)
Full
-
44
70
ns
Driver Disable from Output Low
t
LZ
C
L
= 15pF, SW = V
CC
, (Figure 3)
Full
-
21
70
ns
Receiver Input to Output Delay
t
PLH
, t
PHL
(Figure 4)
Full
30
90
150
ns
Receiver Skew | t
PLH
- t
PHL
|
t
SKD
(Figure 4)
25
-
5
-
ns
Receiver Enable to Output High
t
ZH
C
L
= 15pF, SW = GND, (Figure 5)
Full
-
9
50
ns
Receiver Enable to Output Low
t
ZL
C
L
= 15pF, SW = V
CC
, (Figure 5)
Full
-
9
50
ns
Receiver Disable from Output High
t
HZ
C
L
= 15pF, SW = GND, (Figure 5)
Full
-
9
50
ns
Receiver Disable from Output Low
t
LZ
C
L
= 15pF, SW = V
CC
, (Figure 5)
Full
-
9
50
ns
Maximum Data Rate
f
MAX
Full
5
-
-
Mbps
SWITCHING CHARACTERISTICS (ISL8487, ISL81483)
Driver Input to Output Delay
t
PLH
, t
PHL
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
250
650
2000
ns
Driver Output Skew
t
SKEW
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
-
160
800
ns
Driver Differential Rise or Fall Time
t
R
, t
F
R
DIFF
= 54
, C
L
= 100pF, (Figure 2)
Full
250
900
2000
ns
Driver Enable to Output High
t
ZH
C
L
= 100pF, SW = GND, (Figure 3, Note 5)
Full
250
1000
2000
ns
Driver Enable to Output Low
t
ZL
C
L
= 100pF, SW = V
CC
, (Figure 3, Note 5)
Full
250
860
2000
ns
Driver Disable from Output High
t
HZ
C
L
= 15pF, SW = GND, (Figure 3)
Full
300
660
3000
ns
Driver Disable from Output Low
t
LZ
C
L
= 15pF, SW = V
CC
, (Figure 3)
Full
300
640
3000
ns
Receiver Input to Output Delay
t
PLH
, t
PHL
(Figure 4)
Full
250
500
2000
ns
Receiver Skew | t
PLH
- t
PHL
|
t
SKD
(Figure 4)
25
-
60
-
ns
Receiver Enable to Output High
t
ZH
C
L
= 15pF, SW = GND, (Figure 5, Note 6)
Full
-
10
50
ns
Receiver Enable to Output Low
t
ZL
C
L
= 15pF, SW = V
CC
, (Figure 5, Note 6)
Full
-
10
50
ns
Receiver Disable from Output High
t
HZ
C
L
= 15pF, SW = GND, (Figure 5)
Full
-
10
50
ns
Receiver Disable from Output Low
t
LZ
C
L
= 15pF, SW = V
CC
, (Figure 5)
Full
-
10
50
ns
Maximum Data Rate
f
MAX
Full
250
-
-
kbps
Time to Shutdown
t
SHDN
(Note 7)
Full
50
120
600
ns
Electrical Specifications
Test Conditions: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
CC
= 5V, T
A
= 25
o
C,
(Note 2)
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
ISL8487, ISL81483, ISL81487