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PDF ISL81334 Data sheet ( Hoja de datos )
| Número de pieza | ISL81334 | |
| Descripción | (ISL41334 / ISL81334) Dual Protocol Transceivers | |
| Fabricantes | Intersil Corporation | |
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DATASHEET
ISL81334, ISL41334
±15kV ESD Protected, 5V, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
ISL81334, ISL41334
Rev.4.00
Mar 24, 2017
The ISL81334 and ISL41334 are two-port interface ICs in
which each port can be independently configured as a single
RS-485, RS-422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232
transceiver. With both ports set to the same mode, two
RS-485, RS-422 transceivers, or four RS-232 transceivers are
available.
If either port is in RS-232 mode, the onboard charge pump
generates RS-232 compliant ±5V Tx output levels from a
single VCC 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
receivers feature “full fail-safe” operation, so the Rx outputs
remain in a high state if the inputs are open or shorted
together. The transmitters support up to three data rates, two
of which are slew rate limited for problem-free
communications. The charge pump disables when both ports
are in RS-485 mode, thereby saving power, minimizing noise,
and eliminating the charge pump capacitors.
Both RS-232 and RS-485 modes feature loopback and
shutdown functions. Loopback internally connects the Tx
outputs to the corresponding Rx input, to facilitate board level
self-test implementation. The outputs remain connected to the
loads during loopback, so connection problems (such as
shorted connectors or cables) can be detected. Shutdown
mode disables the Tx and Rx outputs, disables the charge
pumps, and places the IC in a low current (µA) mode.
The ISL41334 is a QFN packaged device that includes two
additional user selectable, lower speed, and edge rate options
for EMI-sensitive designs, or to allow longer bus lengths. It also
features a logic supply 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 also adds active low Rx enable pins to
increase design flexibility, allowing Tx/Rx direction control,
through a single signal per port, by connecting the
corresponding DE and RXEN pins together.
For a single port version of these devices, please see the
ISL81387, ISL41387 datasheet.
Features
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Two independent ports, each user selectable for RS-232
(2 transceivers) or RS-485, RS-422 (1 transceiver)
• Single 5V (10% tolerance) supply
• Flow-through pinouts simplify board layouts
• Pb-Free (RoHS compliant)
• Large (2.7V) differential VOUT for improved noise immunity
in RS-485, RS-422 networks
• Full fail-safe (open/short) Rx in RS-485, RS-422 mode
• Loopback mode facilitates board self-test functions
• User selectable RS-485 data rates (ISL41334 only)
- Fast speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 115kbps
• Fast RS-232 data rate . . . . . . . . . . . . . . . . . . . . up to 650kbps
• Low current Shutdown mode . . . . . . . . . . . . . . . . . . . . . . 42µA
• QFN package saves board space (ISL41334 only)
• Logic supply pin (VL) eases operation in mixed supply
systems (ISL41334 only)
Applications
• Gaming applications (such as, slot machines)
• Single board computers
• Factory automation
• Security networks
• Industrial/process control networks
• Level translators, such as RS-232 to RS-422
• Point of sale equipment
• Dual channel RS-485 interfaces
Related Literature
• For a full list of related documents, visit our website
- ISL81334, ISL41334 product pages
ISL81334, ISL41334 Rev.4.00
Mar 24, 2017
Page 1 of 32
1 page  
ISL81334, ISL41334
Pin Descriptions
PIN MODE
FUNCTION
DEx RS-485 Driver output enable. The driver outputs, Yx and Zx, are enabled by bringing DE high. They are high impedance when DE is low.
Internally pulled high when port selected for RS-485 mode.
RAx RS-232 Receiver output.
RS-485 Receiver output: If Bx > Ax by at least -40mV, RAx is high; If Bx < Ax by -200mV or more, RAx is low; RAx = High if Ax and Bx are
unconnected (floating) or shorted together (i.e., full fail-safe).
RBx RS-232 Receiver output.
RS-485 Not used. Internally pulled-high, and unaffected by RXEN.
Yx RS-232 Driver output with ±15kV ESD protection.
RS-485 Inverting driver output with ±15kV ESD protection.
Zx RS-232 Driver output with ±15kV ESD protection.
RS-485 Noninverting driver output with ±15kV ESD protection.
SPx RS-485 Speed control. Internally pulled-high. (QFN only)
C1+ RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 mode.
C1- RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 mode.
C2+ RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 mode.
C2- RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 mode.
V+ RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed if both ports in RS-485 mode.
V- RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed if both ports in RS-485 mode.
ISL81334, ISL41334 Rev.4.00
Mar 24, 2017
Page 5 of 32
5 Page 
ISL81334, ISL41334
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); unless otherwise specified.
Typicals are at VCC = 5V, TA = +25°C (Note 13). (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN
MAX
(°C) (Note 18) TYP (Note 18) UNIT
Input Low Voltage
VIL1 VL = VCC if QFN
VIL2 VL = 3.3V (QFN only)
VIL3 VL = 2.5V (QFN only)
Input Current
IIN1 Pins Without pull-ups or pull-downs
IIN2 LB, ON/OFF, DEx, SPx (QFN), RXENx (QFN)
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (SELx = VCC)
Receiver Differential Threshold
Voltage
VTH -7V VCM 12V, full fail-safe
Full -
1.4 0.8 V
Full -
1 0.7 V
Full -
- 0.5 V
Full -2 - 2 µA
Full -25 - 25 µA
Full -0.2
-
-0.04
V
Receiver Input Hysteresis
VTH VCM = 0V
Receiver Input Current (Ax, Bx)
IIN VCC = 0V or 4.5 to 5.5V
VIN = 12V
VIN = -7V
Receiver Input Resistance
RIN -7V ≤ VCM ≤ 12V, VCC = 0 (Note 16) or
4.5V ≤ VCC ≤ 5.5V
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (SELx = GND)
25 -
Full -
Full -0.64
Full 15
35
-
-
-
- mV
0.8 mA
- mA
- kΩ
Receiver Input Voltage Range
VIN
Full -25 - 25 V
Receiver Input Threshold
VIL
VIH
Receiver Input Hysteresis
VTH
Receiver Input Resistance
RIN VIN = ±15V, VCC Powered Up (Note 16)
DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)
Full -
1.4 0.8 V
Full 2.4
1.9
-
V
25 - 0.5 - V
Full 3 5 7 kΩ
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Short-Circuit Current
Receiver Three-State Output Current
Unused Receiver (RBx) Pull-Up
Resistance
VOH1
VOH2
VOH3
VOL
IOSR
IOZR
ROBZ
IO = -2mA (VL = VCC if QFN)
IO = -650µA, VL = 3V (QFN only)
IO = -500µA, VL = 2.5V (QFN only)
IO = 3mA
0V ≤ VO ≤ VCC
Output disabled, 0V ≤ VO ≤ VCC (or VL for QFN)
ON/OFF = VCC, SELx = VCC (RS-485 mode)
Full 3.5
4.6
-
V
Full 2.6
2.9
-
V
Full 2
2.4
-
V
Full -
0.1 0.4 V
Full 7
- 85 mA
Full -
- ±10 µA
25 - 40 - kΩ
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current (Note 14)
Shutdown Supply Current
ICC232 SEL1 or SEL2 = GND, LB = ON/OFF = VCC
ICC485 SEL1 and 2 = LB = DE = ON/OFF = VCC
ISHDN232 ON/OFF = SELx = GND, LB = VCC, (SPx = VCC if QFN)
ISHDN485 ON/OFF = DEX = GND,
SELx = LB = VCC,
(SPx = GND if QFN)
SOIC/SSOP
QFN
Full
Full
Full
Full
Full
-
-
-
-
-
3.7 7 mA
1.6 5 mA
25 50 µA
42 80 µA
80 160 µA
ESD CHARACTERISTICS
Bus Pins (Ax, Bx, Yx, Zx) Any Mode
Human body model
25 - 15 - kV
All Other Pins
Human body model
25 - 4 - kV
ISL81334, ISL41334 Rev.4.00
Mar 24, 2017
Page 11 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL81334.PDF ] | |
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