ISO7420E_15 Datasheet, PDF (1/33 Pages) Texas Instruments – ISO742x Low-Power Dual Channel Digital Isolators

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ISO7420E, ISO7420FE, ISO7421E, ISO7421FE
SLLSE45F – DECEMBER 2010 – REVISED JULY 2015
ISO742x Low-Power Dual Channel Digital Isolators
1 Features
•1 Signaling Rate > 50 Mbps
• Default Output 'High' and 'Low' Options
• Low Power Consumption: Typical I_CC per Channel
(3.3-V Supplies):
– ISO7420: 1.4 mA at 1 Mbps, 2.5 mA at
25 Mbps
– ISO7421: 1.8 mA at 1 Mbps, 2.8 mA at
25 Mbps
• Low Propagation Delay: 7 ns Typical
• Low Pulse Skew: 200 ps Typical
• Wide T_A Range Specified: –40°C to 125°C
• 50-KV/μs Transient Immunity, Typical
• Isolation Barrier Life: > 25 Years
• Operates from 3-V to 5.5-V Supply Levels
• 3.3-V and 5-V Level Translation
• Narrow Body SOIC-8 Package
• Safety and Regulatory Approvals:
– 4242 V_PK Isolation per DIN V VDE V 0884-10
and DIN EN 61010-1
– 2500 V_RMS Isolation for 1 minute per UL 1577
– CSA Component Acceptance Notice 5A, IEC
60950-1 and IEC 61010-1 Standards
– CQC Certification per GB4943.1-2011
–
2 Applications
• Opto-Coupler Replacement in:
– Industrial FieldBus
– ProfiBus
– ModBus
– DeviceNet™ Data Buses
– Servo Control Interface
– Motor Control
– Power Supplies
– Battery Packs
3 Description
ISO742x provide galvanic isolation up to 2500 V_RMS
for 1 minute per UL and 4242 V_PK per VDE. These
devices have two isolated channels. Each channel
has a logic input and output buffer separated by a
silicon dioxide (SiO₂) insulation barrier. Used in
conjunction with isolated power supplies, these
devices prevent noise currents on a data bus or other
circuit from entering the local ground and interfering
with or damaging sensitive circuitry. ISO7420 has
both channels in the same direction while ISO7421
has the two channels in opposite direction. In case of
input power or signal loss, default output is 'low' for
devices with suffix 'F' and 'high' for devices without
suffix 'F'. ISO742x have no integrated noise filter and
thus have fast propagation delays.
These devices have TTL input thresholds and
operate from 3-V to 5.5-V supplies. All inputs are 5-V
tolerant when supplied from a 3.3-V supply.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO7420E
ISO7420FE
ISO7421E
SOIC (8)
4.90 mm x 3.91 mm
ISO7421FE
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
V_CCI
V_CCO
Isolation
Capacitor
INx
OUTx
GNDI
GNDO
V_CCI and GNDI are supply and ground
connections respectively for the input
channels.
V_CCO and GNDO are supply and ground
connections respectively for the output
channels.
1
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.