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PDF ISL41387 Data sheet ( Hoja de datos )
| Número de pieza | ISL41387 | |
| Descripción | (ISL41387 / ISL81387) Dual Protocol (RS-232/RS-485) Transceivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ISL81387, ISL41387
December 20, 2005
FN6201.1
±15kV ESD Protected, Dual Protocol
(RS-232/RS-485) Transceivers
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
www.DataSheet4U.cofmunctions. 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
(VL) that sets the VOH 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.
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 VOUT 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)
• Logic Supply Pin (VL) 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
For a dual port version of these devices, please see the
ISL81334/ISL41334 data sheet.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
NO. OF
PORTS
PACKAGE OPTIONS
RS-485 DATA
RATE (bps)
RS-232 DATA
RATE (kbps)
VL PIN?
ACTIVE H or L LOW POWER
Rx ENABLE? SHUTDOWN?
ISL81387
1
20 Ld SOIC, 20 Ld SSOP
20M, 460k
650
NO
H
YES
ISL41387
1 40 Ld QFN (6 x 6mm) 20M, 460k, 115k
650
YES
BOTH
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.
1 page  
ISL81387, ISL41387
Pin Descriptions
PIN MODE
FUNCTION
485/232 BOTH Interface Mode Select input. High for RS-485 Mode and low for RS-232 Mode.
DEN
BOTH Driver output enable. The driver outputs, Y and Z, are enabled by bringing DEN high. They are high impedance when DEN
is low.
GND BOTH Ground connection.
NC BOTH No Connection.
ON BOTH In RS-232 mode only, ON high enables the charge pumps. ON low, with DEN and RXEN low (and RXEN high if QFN), turns
off the charge pumps (in RS-232 mode), and in either mode places the device in low power shutdown. In both modes, when
ON is low, and DEN is high, and RXEN is high or RXEN is low, loopback is enabled.
RXEN BOTH Receiver output enable. Rx is enabled when RXEN is high; Rx is high impedance when RXEN is low and, if using the QFN
package, RXEN is high. When using the QFN and the active high Rx enable function, RXEN should be high or floating.
RXEN
BOTH
Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high and RXEN
is low. (i.e., to use active low Rx enable function, tie RXEN to GND). For single signal Tx/Rx direction control, connect RXEN
to DEN. Internally pulled high. (QFN only)
VCC
VL
A
BOTH System power supply input (5V).
BOTH Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. (QFN only)
RS-232 Receiver input with ±15kV ESD protection. A low on A forces RA high; A high on A forces RA low.
RS-485 Inverting receiver input with ±15kV ESD protection.
B RS-232 Receiver input with ±15kV ESD protection. A low on B forces RB high; A high on B forces RB low.
RS-485 Noninverting receiver input with ±15kV ESD protection.
DY
DZ
SLEW
RS-232 Driver input. A low on DY forces output Y high. Similarly, a high on DY forces output Y low.
RS-485 Driver input. A low on DY forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high.
RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low.
RS-485 Slew rate control. With the SLEW pin high, the drivers run at the maximum slew rate (20Mbps). With the SLEW pin low, the
drivers run at a reduced slew rate (460kbps). On the QFN version, works in conjunction with SPB to select one of three
RS-485 data rates. Internally pulled high in RS-485 mode.
SPB
RS-485 Speed control. Works in conjunction with the SLEW pin to select the 20Mbps, 460kbps or 115kbps RS-485 data rate.
Internally pulled high. (QFN only)
RA RS-232 Receiver output.
RS-485 Receiver output: If B > A by at least -40mV, RA is high; If B < A by -200mV or more, RA is low; RA = High if A and B are
unconnected (floating) or shorted together (i.e., full fail-safe).
RB RS-232 Receiver output.
RS-485 Not used. Output is high impedance, and unaffected by RXEN and RXEN.
Y RS-232 Driver output with ±15kV ESD protection.
RS-485 Inverting driver output with ±15kV ESD protection.
Z RS-232 Driver output with ±15kV ESD protection.
RS-485 Noninverting driver output with ±15kV ESD protection.
C1+ RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
C1- RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
C2+ RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
C2- RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
V+ RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed in RS-485 Mode.
V- RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed in RS-485 Mode.
5 FN6201.1
December 20, 2005
5 Page 
Test Circuits and Waveforms
ISL81387, ISL41387
VCC DEN
Y
DY
D
Z
R
RD VOD
R
VOC
+
-
VCM
FIGURE 1. RS-485 DRIVER VOD AND VOC TEST CIRCUIT
DEN
VCC
DY Y
D
Z
SIGNAL
GENERATOR
CL = 100pF
RDIFF
CL = 100pF
DY 1.5V
OUT (Z)
tPLH
50%
tPHL
OUT (Y)
50%
tDLH
DIFF OUT (Z - Y)
90%
10%
tR
0V
1.5V
3V
0V
tPHL
50%
VOH
VOL
tPLH
50%
tDHL
90%
0V
10%
tF
VOH
VOL
+VOD
-VOD
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
SIGNAL
GENERATOR
DEN
DY
Y
D
Z
CL
500Ω
VCC
SW GND
FOR SHDN TESTS, SWITCH ON AND DEN L- H SIMULTANEOUSLY
PARAMETER OUTPUT
tHZ Y/Z
RXEN
X
DY SW CL (pF)
0/1 GND
15
tLZ
Y/Z
X
1/0 VCC
15
tZH Y/Z X 0/1 GND 100
tZL Y/Z X 1/0 VCC 100
tZH(SHDN)
Y/Z
0 0/1 GND 100
tZL(SHDN)
Y/Z
0 1/0 VCC 100
DEN
tZH
tZH(SHDN)
OUT (Y, Z)
tZL
tZL(SHDN)
OUT (Y, Z)
ENABLED
1.5V
1.5V
3V
0V
tHZ
OUTPUT HIGH
2.3V
VOH - 0.5V VOH
0V
tLZ
2.3V
OUTPUT LOW
VCC
VOL + 0.5V VOL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES
11 FN6201.1
December 20, 2005
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet ISL41387.PDF ] | |
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