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 (VCC1), 4.5-V to

5.5-V Bus-side supply (VCC2)

• 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 plugin

• Ultra-small SSOP (DBQ-16) package

• Safety-related certifications:

– 4242-VPK VIOTM and 566-VPK VIORM per DIN

VDE V 0884-11:2017-01

– 3000-VRMS 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 ultrasmall

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 VRMS 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 lowvoltage

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.