ISO7220A-Q1

ISO7221A-Q1

ISO7221C-Q1

www.ti.com

SLLS965C – JULY 2009 – REVISED MAY 2012

DUAL DIGITAL ISOLATORS

Check for Samples: ISO7220A-Q1, ISO7221A-Q1, ISO7221C-Q1

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FEATURES

•

Qualified for Automotive Applications

•

•

1-Mbps and 25-Mbps Signaling Rate Options

–

UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2),

IEC 61010-1, IEC 60950-1 and CSA

–

Low Channel-to-Channel Output Skew:

Approved

1 ns (Max)

–

50 kV/

μs Typical Transient Immunity

–

Low Pulse-Width Distortion (PWD):

1 ns (Max)

•

Operates with 3.3-V or 5-V Supplies

–

Low Jitter Content: 1 ns (Typ) at 150 Mbps

•

4 kV ESD Protection

•

25-Year (Typ) Life at Rated Voltage

•

High Electromagnetic Immunity

(See Application Report SLLA197 and

•

–40°C to 125°C Operating Free-Air

Figure 14)

Temperature Range

DESCRIPTION

The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented

in the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic input

4000 V. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and

prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or

damaging sensitive circuitry.

A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation

barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or

resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure

the proper dc level of the output. If this dc-refresh pulse is not received every 4

μs, the input is assumed to be

unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.

The small capacitance and resulting time constant provide fast operation with signaling rates available from 0

input that prevents transient pulses from being passed to the output of the device.

These devices require two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when

supplied from a 3.3-V supply and all outputs are 4-mA CMOS.

These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.

(1)

The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.