MCU
GND1
Logic Supply
Galvanic Isolation
Barrier
V
DD
DGND
Logic Ground
RE
V
CC1
D
R
V
CC2
B
ISO1500
A
GND2
RS485 Bus
Bus-Side Supply
Isolated Ground
DE
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ISO1500
SLLSF21D –SEPTEMBER 2018–REVISED FEBRUARY 2020
ISO1500 3-kV
RMS
Basic Isolated RS-485/RS-422 Transceiver in Ultra-Small Package
1
1 Features
1
• Meets or exceeds requirements of TIA/EIA-485-A
• Half-duplex transceiver
• Low-EMI 1-Mbps data rate
• Bus I/O protection
– ± 16 kV HBM ESD
• 1.71-V to 5.5-V Logic-side supply (V
CC1
), 4.5-V to
5.5-V Bus-side supply (V
CC2
)
• 1/8 Unit load: up to 256 nodes on bus
• Failsafe receiver for bus open, short, and idle
• 100-kV/µs (typical) High common-mode transient
immunity
• Extended temperature range from –40°C to
+125°C
• Glitch-free power-up and power-down for hot plug-
in
• Ultra-small SSOP (DBQ-16) package
• Safety-related certifications:
– 4242-V
PK
V
IOTM
and 566-V
PK
V
IORM
per DIN
VDE V 0884-11:2017-01
– 3000-V
RMS
Isolation for 1 minute per UL 1577
– IEC 60950-1, IEC 62368-1 and IEC 61010-1
certifications
– CQC, TUV, and CSA certifications
2 Applications
• Electricity meters
• Protection relay
• Factory automation & control
• HVAC systems and building automation
• Motor drives
3 Description
The ISO1500 device is a galvanically-isolated
differential line transceiver for TIA/EIA RS-485 and
RS-422 applications. This device has a 3-channel
digital isolator and an RS-485 transceiver in an ultra-
small 16-pin SSOP package. The bus pins of this
transceiver are protected against IEC ESD contact
discharge and IEC EFT events. The receiver output
has a failsafe for bus open, short, and idle conditions.
The small solution size of ISO1500 greatly reduces
the board space required compared to other
integrated isolated RS-485 solutions or discrete
implementation with optocouplers and non-isolated
RS-485 transceiver.
The device is used for long distance communications.
Isolation breaks the ground loop between the
communicating nodes, allowing for a much larger
common mode voltage range. The symmetrical
isolation barrier of each device is tested to provide
3000 V
RMS
of isolation for 1 minute per UL 1577
between the bus-line transceiver and the logic-level
interface.
The ISO1500 device can operate from 1.71 V to 5.5
V on side 1 which lets the devices interface with low-
voltage FPGAs and ASICs. The supply voltage on
side 2 is from 4.5 V to 5.5 V. This device supports a
wide operating ambient temperature range from
–40°C to +125°C.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
ISO1500 SSOP (16) 4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
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