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ISL3283EIHZ-T Datasheet(PDF) 9 Page - Integrated Device Technology

No. de pieza ISL3283EIHZ-T
Descripción Electrónicos  짹16.5kV ESD Protected, 125째C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low Power, RS-485/RS-422 Receivers
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Fabricante Electrónico  IDT [Integrated Device Technology]
Página de inicio  http://www.idt.com
Logo IDT - Integrated Device Technology

ISL3283EIHZ-T Datasheet(HTML) 9 Page - Integrated Device Technology

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9
FN6543.2
October 18, 2007
All the receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or connected to
a terminated but undriven bus. Fail-safe with shorted inputs is
achieved by setting the Rx upper switching point to -50mV,
thereby ensuring that the Rx sees 0V differential as a high
input level.
All receivers easily support a 20Mbps data rate, and all
receiver outputs (except on the ISL3280E and ISL3284E)
are tri-statable via the active low RE input or by the active
high RE input.
Wide Supply Range
The ISL3280E, ISL3281E, ISL3282E, ISL3283E,
ISL3284E, ISL3285E are designed to operate with a wide
range of supply voltages from 3.0V to 5.5V. These devices
meet the RS-422 and RS-485 specifications over this full
range.
Logic Supply (VL Pin, ISL3282E, ISL3284E,
ISL3285E Only)
Note: Power-up VCC before powering up the VL supply.
The ISL3282E, ISL3284E, and ISL3285E include a VL pin
that powers the logic input (RE or RE) and / or the Rx output.
These pins interface with “logic” devices such as UARTs,
ASICs, and microcontrollers and today most of these
devices use power supplies significantly lower than 3.3V.
Thus, a 3.3V output level from a 3.3V powered RS-485 IC
might seriously overdrive and damage the logic device input.
Similarly, the logic device’s low VOH might not exceed the
VIH of a 3.3V or 5V powered RE input. Connecting the VL
pin to the power supply of the logic device (as shown in
Figure 3) limits the ISL3282E, ISL3284E, ISL3285E’s Rx
output VOH to VL (see Figures 6 through 10), and reduces
the RE / RE input switching point to a value compatible with
the logic device’s output levels. Tailoring the logic pin input
switching point and output levels to the supply voltage of the
UART, ASIC, or microcontroller eliminates the need for a
level shifter/translator between the two ICs.
VL can be anywhere from VCC down to 1.35V, but the input
switching points may not provide enough noise margin when
VL < 1.6V. Table 2 indicates typical VIH, VIL, and data rate
values for various VL settings so the user can ascertain
whether or not a particular VL voltage meets his/her needs.
The quiescent, RO unloaded, VL supply current (IL) is
typically less than 60µA for VL ≤ 3.3V, as shown in Figure 5.
ESD Protection
All pins on these devices include class 3 (>4kV) Human
Body Model (HBM) ESD protection structures, but the
RS-485 pins (receiver inputs) incorporate advanced
structures allowing them to survive ESD events in excess
of ±16.5kV HBM and ±16.5kV IEC61000. The RS-485 pins
are particularly vulnerable to ESD damage because they
typically connect to an exposed port on the exterior of the
finished product. Simply touching the port pins, or
connecting a cable, can cause an ESD event that might
destroy unprotected ICs. These new ESD structures
protect the device whether or not it is powered up, and
without degrading the RS-485 common mode range of -7V
to +12V. This built-in ESD protection eliminates the need
for board level protection structures (e.g., transient
suppression diodes), and the associated, undesirable
capacitive load they present.
TABLE 2. VIH, VIL AND DATA RATE vs VL FOR VCC = 3.3V OR
5V
VL
(V)
VIH
(V)
VIL
(V)
DATA RATE
(Mbps)
1.35
0.55
0.5
11
1.6
0.7
0.6
16
1.8
0.8
0.7
23
2.3
1
0.9
27
2.7
1.1
1
30
3.3
1.3
1.2
30
5.5 (i.e., VCC)2
1.8
24
FIGURE 3. USING VL PIN TO ADJUST LOGIC LEVELS
GND
RXD
RXEN
VCC = +2V
UART/PROCESSOR
GND
RO
RE
VCC = +3.3V
ISL3283E
VOH ≤ 2V
VOH = 3.3V
VIH ≥ 2V
ESD
DIODE
GND
RXD
RXEN
VCC = +2V
UART/PROCESSOR
GND
RO
RE
VCC = +3.3V TO 5V
ISL3282E
VOH ≤ 2V
VOH = 2V
VIH = 1V
ESD
DIODE
VL
ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E


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