ISL3283EFHZ-T Intersil, ISL3283EFHZ-T Datasheet - Page 9

• Manufacturer Part Number: ISL3283EFHZ-T
• Description: IC RCVR ESD RS485/422 LP SOT23-6
• Manufacturer: Intersil
• Type: Receiverr

Specifications of ISL3283EFHZ-T

• Number Of Drivers/receivers: 0/1
• Protocol: RS422, RS485
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL3283EFHZ-TTR

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.
5.5 (i.e., V
TABLE 2. V
FIGURE 3. USING V
1.35
1.6
1.8
2.3
2.7
3.3
V
(V)
V
L
CC
GND
GND
V
CC
ISL3283E
ISL3282E
CC
= +3.3V TO 5V
5V
)
IH
= +3.3V
, V
IL
RO
RO
RE
RE
V
L
AND DATA RATE vs V
ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E
0.55
V
(V)
0.7
0.8
1.1
1.3
V
V
V
1
2
V
IH
OH
IH
OH
L
IH
≥ 2V
PIN TO ADJUST LOGIC LEVELS
= 1V
= 3.3V
= 2V
V
V
OH
OH
9
≤ 2V
≤ 2V
UART/PROCESSOR
UART/PROCESSOR
R
RXEN
R
RXEN
V
0.5
0.6
0.7
0.9
1.2
1.8
(V)
1
V
XD
V
XD
IL
CC
CC
L
FOR V
= +2V
= +2V
DIODE
DIODE
ESD
GND
ESD
GND
CC
DATA RATE
(Mbps)
= 3.3V OR
11
16
23
27
30
30
24
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 (V
ISL3285E Only)
Note: Power-up V
The ISL3282E, ISL3284E, and ISL3285E include a V
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 V
V
pin to the power supply of the logic device (as shown in
Figure 3) limits the ISL3282E, ISL3284E, ISL3285E’s Rx
output V
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.
V
switching points may not provide enough noise margin when
V
values for various V
whether or not a particular V
The quiescent, RO unloaded, V
typically less than 60µA for V
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.
IH
L
L
can be anywhere from V
< 1.6V. Table 2 indicates typical V
of a 3.3V or 5V powered RE input. Connecting the V
OH
to V
L
CC
(see Figures 6 through 10), and reduces
L
L
Pin, ISL3282E, ISL3284E,
before powering up the V
settings so the user can ascertain
CC
L
L
voltage meets his/her needs.
≤ 3.3V, as shown in Figure 5.
down to 1.35V, but the input
L
OH
supply current (I
might not exceed the
IH
, V
IL
, and data rate
L
October 18, 2007
supply.
L
) is
L
FN6543.2
pin
L