DATASHEET
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL317xE are ±15kV IEC61000 ESD protected,
3.3V powered single transceivers that meet both the RS-485
and RS-422 standards for balanced communication. These
devices have very low bus currents (+125mA/-100mA), so
they present a true “1/8 unit load” to the RS-485 bus. This
allows up to 256 transceivers on the network without
violating the RS-485 specification’s 32 unit load maximum,
and without using repeaters. For example, in a remote utility
meter reading system, individual meter readings are routed to
a concentrator using an RS-485 network, so the high allowed
node count minimizes the number of repeaters required.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven.
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
The ISL3170E through ISL3175E utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications. Slew rate
limited versions also include receiver input filtering to
enhance noise immunity in the presence of slow input signals.
The ISL3170E, ISL3171E, ISL3173E, ISL3174E, ISL3176E,
and ISL3177E are configured for full duplex (separate Rx
input and Tx output pins) applications. The half duplex
versions multiplex the Rx inputs and Tx outputs to allow
transceivers with output disable functions in 8 Ld packages.
FN6307
Rev.6.00
Aug 31, 2017
Features
• IEC61000 ESD protection on RS-485 I/O pins . . . . ±15kV
- Class 3 ESD level on all other pins . . . . . . . >7kV HBM
• Full fail-safe (open, short, terminated/floating) receivers
• Hot plug - Tx and Rx outputs remain three-state during
power-up (only versions with output enable pins)
• True 1/8 unit load allows up to 256 devices on the bus
• Single 3.3V supply
• High data rates . . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
• Low quiescent supply current. . . . . . . . . . . . .800µA (Max)
- Ultra low shutdown supply current . . . . . . . . . . . . .10nA
• -7V to +12V common-mode input/output voltage range
• Half and full duplex pinouts
• Three state Rx and Tx outputs available
• Current limiting and thermal shutdown for driver overload
protection
• Tiny MSOP packages consume 50% less board space
• Pb-free (RoHS compliant)
Applications
• Automated utility meter reading systems
• High node count systems
• Field bus networks
• Security camera networks
• Building environmental control/lighting systems
• Industrial/process control networks
Related Literature
• For a full list of related documents, visit our website
-
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
ISL3175E, ISL3176E, ISL3177E, ISL3178E
product pages
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL3170E
ISL3171E
ISL3172E
ISL3173E
ISL3174E
ISL3175E
ISL3176E
ISL3177E
ISL3178E
HALF/FULL
DUPLEX
Full
Full
Half
Full
Full
Half
Full
Full
Half
DATA RATE
(Mbps)
0.25
0.25
0.25
0.5
0.5
0.5
20
20
20
SLEW-RATE
LIMITED?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
HOT
PLUG?
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
# DEVICES
ON BUS
256
256
256
256
256
256
256
256
256
RX/TX
ENABLE?
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
QUIESCENT
I
CC
(µA)
510
510
510
510
510
510
510
510
510
LOW POWER
SHUTDOWN?
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
PIN
COUNT
10, 14
8
8
10, 14
8
8
10, 14
8
8
FN6307 Rev.6.00
Aug 31, 2017
Page 1 of 21
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Ordering Information
PART NUMBER (Notes
3, 4)
ISL3170EIBZ (Notes
1, 2)
ISL3170EIUZ (Note
1)
ISL3171EIBZ (Notes
1, 2)
ISL3171EIUZ (Note
1)
ISL3172EIBZ (Notes
1, 2)
ISL3172EIUZ (Note
1)
ISL3173EIBZ (Note
1)
ISL3173EIUZ (Note
1)
ISL3174EIBZ (Note
1)
ISL3174EIUZ (Note
1)
ISL3175EIBZ (Note
1)
ISL3175EIUZ (Note
1)
ISL3176EIBZ (Note
1)
ISL3176EIUZ (Notes
1, 2)
ISL3177EIBZ (Note
1)
ISL3177EIUZ (Note
1)
ISL3178EIBZ (Notes
1, 2)
ISL3178EIUZ (Note
1)
NOTES:
1. Add “-T” suffix for 2.5k tape and reel options. Refer to
TB347
for details on reel specifications.
2. Add “-T7A” suffix for 250 unit tape and reel options. Refer to
TB347
for details on reel specifications.
3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
4. For Moisture Sensitivity Level (MSL), see the product information page for the
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E,
ISL3176E, ISL3177E, ISL3178E.
For more information on MSL refer to
TB363.
PART MARKING
3170EIBZ
3170Z
3171 EIBZ
3171Z
3172 EIBZ
3172Z
3173EIBZ
3173Z
3174 EIBZ
3174Z
3175 EIBZ
3175Z
3176EIBZ
3176Z
3177 EIBZ
3177Z
3178 EIBZ
3178Z
TEMP. RANGE (°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE (RoHS Compliant)
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
8 Ld SOIC
8 Ld MSOP
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
8 Ld SOIC
8 Ld MSOP
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
8 Ld SOIC
8 Ld MSOP
PKG. DWG. #
M14.15
M10.118
M8.15
M8.118
M8.15
M8.118
M14.15
M10.118
M8.15
M8.118
M8.15
M8.118
M14.15
M10.118
M8.15
M8.118
M8.15
M8.118
FN6307 Rev.6.00
Aug 31, 2017
Page 2 of 21
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Pinouts
ISL3172E, ISL3175E, ISL3178E
(8 LD MSOP, SOIC)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
8
7
6
5
VCC
B/Z
A/Y
GND
ISL3171E, ISL3174E, ISL3177E
(8 LD MSOP, SOIC)
TOP VIEW
VCC 1
RO 2
DI 3
GND 4
D
8
7
6
5
A
B
Z
Y
R
R
ISL3170E, ISL3173E, ISL3176E
(10 LD MSOP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
GND 5
D
10 VCC
9 A
8 B
7 Z
6 Y
ISL3170E, ISL3173E, ISL3176E
(14 LD SOIC)
TOP VIEW
NC 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
D
R
14 VCC
13 NC
12 A
11 B
10 Z
9 Y
8 NC
R
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
0
1
DE
1
1
0
0
DI
1
0
X
X
Z
0
1
High-Z
High-Z*
OUTPUTS
Y
1
0
High-Z
High-Z*
NOTE: *Shutdown Mode (see
Note 11
on
page 9),
except for the
ISL3171E, ISL3174E, ISL3177E.
RECEIVING
INPUTS
RE
0
0
0
0
1
1
DE
DE
Half Duplex Full Duplex
0
0
0
0
0
1
X
X
X
X
X
X
A-B
V
AB
≥ -0.05V
V
AB
≤ -0.2V
Inputs Open/Shorted
X
X
OUTPUT
RO
1
-0.05V > V
AB
> -0.2V Undetermined
0
1
High-Z*
High-Z
NOTE: *Shutdown Mode (see
Note 11),
except for the ISL3171E,
ISL3174E, ISL3177E.
FN6307 Rev.6.00
Aug 31, 2017
Page 3 of 21
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Pin Descriptions
PIN
RO
RE
DE
DI
FUNCTION
Receiver output: If A-B ≥ -50mV, RO is high; If A-B ≤ -200mV, RO is low; if A and B are unconnected (floating) or shorted, RO = High.
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. If the Rx enable function is not required,
connect RE directly to GND or through a 1kΩ to 3kΩ resistor to GND.
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and are high impedance when DE is low. If the Tx enable
function is not required, connect DE to V
CC
through a 1kΩ to 3kΩ resistor.
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
GND Ground connection.
A/Y
B/Z
A
B
Y
Z
±15kV IEC61000 ESD Protected RS-485/422 level, noninverting receiver input and noninverting driver output. Pin is an input if DE = 0; pin
is an output if DE = 1.
±15kV IEC61000 ESD Protected RS-485/422 level, Inverting receiver input and inverting driver output. Pin is an input if DE = 0; pin is an
output if DE = 1.
±15kV IEC61000 ESD Protected RS-485/422 level, noninverting receiver input.
±15kV IEC61000 ESD Protected RS-485/422 level, inverting receiver input.
±15kV IEC61000 ESD Protected RS-485/422 level, noninverting driver output.
±15kV IEC61000 ESD Protected RS-485/422 level, inverting driver output.
V
CC
System power supply input (3.0V to 3.6V).
NC
No Connection.
Typical Operating Circuits
+3.3V
+
8
V
CC
1 RO
2 RE
3 DE
4 DI
D
GND
5
GND
5
R
B/Z
A/Y
7
6
R
T
R
T
7
6
B/Z
A/Y
R
0.1µF
0.1µF
+
8
V
CC
D
DI 4
DE 3
RE 2
RO 1
+3.3V
FIGURE 1. ISL3172E, ISL3175E, ISL3178E
+3.3V
+
1
V
CC
2 RO
A 8
R
B 7
R
T
R
T
5
6
0.1µF
0.1µF
+
+3.3V
1
V
CC
Y
Z
D
DI 3
3 DI
Z 6
D
GND
4
Y 5
7 B
8 A
GND
4
R
RO 2
FIGURE 2. ISL3171E, ISL3174E, ISL3177E
FN6307 Rev.6.00
Aug 31, 2017
Page 4 of 21
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Typical Operating Circuits
(Continued)
+3.3V
+
14
V
CC
2 RO
3 RE
4 DE
5 DI
Z 10
D
GND
6, 7
Y 9
R
T
11 B
12 A
GND
6, 7
R
R
A 12
B 11
0.1µF
R
T
(PIN NUMBERS FOR SOIC)
0.1µF
+
14
9 Y
10 Z
V
CC
D
DI 5
DE 4
RE 3
RO 2
+3.3V
FIGURE 3. ISL3170E, ISL3173E, ISL3176E
FN6307 Rev.6.00
Aug 31, 2017
Page 5 of 21
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