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ISL3283EIHZ-T 数据表(PDF) 9 Page - Intersil Corporation

部件名 ISL3283EIHZ-T
功能描述  ±16.5kV ESD Protected, 125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low Power, RS-485/RS-422 Receivers
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL3283EIHZ-T 数据表(HTML) 9 Page - Intersil Corporation

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ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E
9
FN6543.4
July 27, 2015
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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: If powered from separate supplies, power-up VCC before
powering up the VL supply and keep VL ≤ VCC.
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 6) limits the ISL3282E, ISL3284E,
ISL3285E’s Rx output VOH to VL (see Figures 9 through 13)
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 8.
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 6. 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


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