®
ISL81387, ISL41387
Data Sheet
December 1, 2005
FN6201.0
±
15kV
ESD Protected, Dual Protocol
(RS-232/RS-485) Transceivers
Features
• User Selectable RS-232 or RS-485/422 Interface Port
(Two RS-232 Transceivers or One RS-485/422
Transceiver)
•
±15kV
(HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
• Flow-Through Pinouts Simplify Board Layouts
•
Pb-Free Plus Anneal Available (RoHS Compliant)
• Large (2.7V) Differential V
OUT
for Improved Noise
Immunity in RS-485/422 Networks
• Full Failsafe (Open/Short) Rx in RS-485/422 Mode
• Loopback Mode Facilitates Board Self Test Functions
• User Selectable RS-485 Data Rates . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited (ISL41387 Only) . . . . . . . . . 115kbps
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 650kbps
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35µA
• QFN Package Saves Board Space (ISL41387 Only)
These devices are BiCMOS interface ICs that are user
configured as either a single RS-422/485 differential
transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.
In RS-232 mode, the on-board charge pump generates
RS-232 compliant
±5V
Tx output levels, from a supply as low
as 4.5V. Four small 0.1µF capacitors are required for the
charge pump. The transceivers are RS-232 compliant, with
the Rx inputs handling up to
±25V,
and the Tx outputs
handling
±12V.
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
RS-485 receiver features "full failsafe" operation, so the Rx
output remains in a high state if the inputs are open or
shorted together. The RS-485 transmitter supports up to
three data rates, two of which are slew rate limited for
problem free communications. The charge pump disables in
RS-485 mode, thereby saving power, minimizing noise, and
eliminating the charge pump capacitors.
Both RS-232/485 modes feature loopback and shutdown
functions. The loopback mode internally connects the Tx
outputs to the corresponding Rx input, which facilitates the
implementation of board level self test functions. The outputs
remain connected to the loads during loopback, so
connection problems (e.g., shorted connectors or cables)
can be detected. The shutdown mode disables the Tx and
Rx outputs, disables the charge pump if in RS-232 mode,
and places the IC in a low current (20µA) mode.
The ISL41387 is a QFN packaged device that offers
additional functionality, including a lower speed and edge
rate option (115kbps) for EMI sensitive designs, or to allow
longer bus lengths. It also features a logic supply voltage pin
(V
L
) that sets the V
OH
level of logic outputs, and the
switching points of logic inputs, to be compatible with
another supply voltage in mixed voltage systems. The QFN's
choice of active high or low Rx enable pins increases design
flexibility, allowing Tx/Rx direction control via a single signal
by connecting DEN and RXEN together.
For a dual port version of these devices, please see the
ISL81334/ISL41334 data sheet.
• Logic Supply Pin (V
L
) Eases Operation in Mixed Supply
Systems (ISL41387 Only)
Applications
• Gaming Applications (e.g., Slot machines)
• Single Board Computers
• Factory Automation
• Security Networks
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• Point of Sale Equipment
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL81387
ISL41387
NO. OF
PORTS
1
1
PACKAGE OPTIONS
20 Ld SOIC, 20 Ld SSOP
40 Ld QFN (6 x 6mm)
RS-485 DATA
RATE (bps)
20M, 460k
20M, 460k, 115k
RS-232 DATA
RATE (kbps)
650
650
V
L
PIN?
NO
YES
ACTIVE H or L
Rx ENABLE?
H
BOTH
LOW POWER
SHUTDOWN?
YES
YES
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or
1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL81387, ISL41387
Ordering Information
PART NO.
(NOTE)
ISL81387IAZA
PART
MARKING
81387IAZ
TEMP.
RANGE
(
o
C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
M20.209
-40 to 85 20 Ld SSOP
ISL81387IAZA-T 81387IAZ
-40 to 85 20 Ld SSOP
M20.209
Tape and Reel
-40 to 85 20 Ld SOIC
M20.3
ISL81387IBZ
ISL81387IBZ-T
ISL81387IBZ
ISL81387IBZ
-40 to 85 20 Ld SOIC
M20.3
Tape and Reel
-40 to 85 20 Ld SOIC
M20.3
ISL81387IBZA
ISL81387IBZ
ISL81387IBZA-T ISL81387IBZ
-40 to 85 20 Ld SOIC
M20.3
Tape and Reel
-40 to 85 40 Ld QFN
L40.6x6
ISL41387IRZA
41387IRZ
ISL41387IRZA-T 41387IRZ
-40 to 85 40 Ld QFN
L40.6x6
Tape and Reel
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
2
ISL81387, ISL41387
Pinouts
ISL81387 (SOIC, SSOP)
TOP VIEW
C1+ 1
C1- 2
V+
3
20 C2+
19 C2-
18 V
CC
17 R
A
16 R
B
15 D
Y
14 D
Z
/SLEW
13 ON
12 RXEN
11 V-
A 4
B 5
Y 6
Z 7
485/232 8
DEN 9
GND 10
ISL41387 (QFN)
TOP VIEW
V
CC
C1+
C2+
C1-
C2-
NC
NC
NC
NC
32
V
L
31
30
R
A
29
R
B
28
D
Y
27
D
Z
/SLEW
26
NC
25
NC
24
NC
23
NC
22
NC
21
ON
11
485/232
12
DEN
13
NC
14
SPB
15
GND
16
GND
17
RXEN
18
NC
19
V-
20
RXEN
40
V+
A
B
Y
Z
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
39
38
37
36
35
34
33
3
ISL81387, ISL41387
TABLE 2. ISL81387 FUNCTION TABLE
INPUTS
485/232
0
0
0
0
0
0
0
X
1
1
1
1
1
NOTES:
1. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN are high.
2. Loopback is enabled when ON = 0, and DEN = RXEN = 1.
ON
1
1
1
1
0
0
0
0
1
X
X
1
0
RXEN
0
0
1
1
0
1
1
0
0
0
1
1
1
DEN SLEW
0
1
0
1
1
0
1
0
0
1
0
1
1
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
X
X
1/0
X
1/0
1/0
RECEIVER
OUTPUTS
R
A
High-Z
High-Z
ON
ON
High-Z
High-Z
ON
High-Z
High-Z
High-Z
ON
ON
ON
R
B
High-Z
High-Z
ON
ON
High-Z
ON
ON
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
DRIVER OUTPUTS
Y
High-Z
ON
High-Z
ON
ON
ON
ON
High-Z
High-Z
ON
High-Z
ON
ON
Z
High-Z
ON
High-Z
ON
High-Z
High-Z
ON
High-Z
High-Z
ON
High-Z
ON
ON
DRIVER
SPEED
(Mbps)
-
0.46
-
0.46
0.46
0.46
0.46
-
-
20/0.46
-
20/0.46
20/0.46
CHARGE
PUMPS
(NOTE 1)
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
LOOPBACK
(NOTE 2)
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
MODE
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
Shutdown
RS-485
RS-485
RS-485
RS-485
RS-485
ISL81387 Truth Tables
RS-232 TRANSMITTING MODE
INPUTS (ON = 1)
485/232
0
0
0
0
0
DEN
1
1
1
1
0
D
Y
0
0
1
1
X
D
Z
0
1
0
1
X
OUTPUTS
Y
1
1
0
0
High-Z
Z
1
0
1
0
High-Z
485/232
1
1
1
1
1
DEN
1
1
1
1
0
RS-485 TRANSMITTING MODE
INPUTS (ON = 1)
D
Y
0
1
0
1
X
SLEW
1
1
0
0
X
Y
1
0
1
0
OUTPUTS
Z
0
1
0
1
DATA RATE
(Mbps)
20
20
0.46
0.46
-
High-Z High-Z
RS-232 RECEIVING MODE
INPUTS (ON = 1)
485/232
0
0
0
0
0
0
RXEN
1
1
1
1
1
0
A
0
0
1
1
Open
X
B
0
1
0
1
Open
X
OUTPUT
R
A
1
1
0
0
1
High-Z
R
B
1
0
1
0
1
High-Z
485/232
1
1
1
1
RXEN
1
1
1
0
RS-485 RECEIVING MODE
INPUTS (ON = 1)
B-A
≥
-40mV
≤
-200mV
Open or Shorted together
X
OUTPUT
R
A
1
0
1
High-Z
R
B
High-Z
High-Z
High-Z
High-Z
4
ISL81387, ISL41387
TABLE 3. ISL41387 FUNCTION TABLE
INPUTS
RXEN
and/or
RXEN
1 and 0
1 and 0
0 or 1
0 or 1
1 and 0
0 or 1
0 or 1
1 and 0
1 and 0
1 and 0
1 and 0
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
RECEIVER
OUTPUTS
DRIVER
OUTPUTS
DRIVER
DATA
RATE
(Mbps)
-
0.46
-
0.46
0.46
0.46
0.46
-
-
0.46/0.115
20
-
0.46/0.115
20
0.46/0.115
20
485/232
0
0
0
0
0
0
0
X
1
1
1
1
1
1
1
1
NOTES:
ON
1
1
1
1
0
0
0
0
1
X
X
X
1
1
0
0
DEN
0
1
0
1
1
0
1
0
0
1
1
0
1
1
1
1
SLEW
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
X
X
0
1
X
0
1
0
1
SPB
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
X
X
1/0
X
X
1/0
X
1/0
X
R
A
High-Z
High-Z
ON
ON
High-Z
High-Z
ON
High-Z
High-Z
High-Z
High-Z
ON
ON
ON
ON
ON
R
B
High-Z
High-Z
ON
ON
High-Z
ON
ON
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
Y
High-Z
ON
High-Z
ON
ON
ON
ON
High-Z
High-Z
ON
ON
High-Z
ON
ON
ON
ON
Z
High-Z
ON
High-Z
ON
High-Z
High-Z
ON
High-Z
High-Z
ON
ON
High-Z
ON
ON
ON
ON
CHARGE
PUMPS
(NOTE 3)
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
MODE
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232 (Note 4)
Shutdown
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485 (Note 4)
RS-485 (Note 4)
3. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN is high, or RXEN is low.
4. Loopback is enabled when ON = 0, and DEN = 1, and (RXEN = 1 or RXEN = 0).
ISL41387 Truth Tables
RS-232 TRANSMITTING MODE
INPUTS (ON=1)
485/232
0
0
0
0
0
DEN
1
1
1
1
0
D
Y
0
0
1
1
X
D
Z
0
1
0
1
X
OUTPUTS
Y
1
1
0
0
High-Z
Z
1
0
1
0
High-Z
485/232
1
1
1
1
DEN
1
1
1
0
RS-485 TRANSMITTING MODE
INPUTS (ON=1)
SLEW
0
0
1
X
SPB
0
1
X
X
D
Y
0/1
0/1
0/1
X
OUTPUTS
Y
1/0
1/0
1/0
Z
0/1
0/1
0/1
DATA
Mbps
0.115
0.460
20
-
High-Z High-Z
RS-485 RECEIVING MODE
INPUTS (ON=1)
OUTPUT
B-A
≥
-40mV
≤
-200mV
Open or Shorted
together
X
R
A
1
0
1
R
B
High-Z
High-Z
High-Z
RS-232 RECEIVING MODE
INPUTS (ON=1)
485/232
0
0
0
0
0
0
RXEN and/or
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
1 and 0
A
0
0
1
1
Open
X
B
0
1
0
1
Open
X
OUTPUT
R
A
1
1
0
0
1
R
B
1
0
1
0
1
485/232
1
1
1
1
RXEN and/or
0 or 1
0 or 1
0 or 1
1 and 0
High-Z High-Z
High-Z High-Z
5
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