ISO7420 Datasheet, PDF (1/19 Pages) Texas Instruments – Low-Power Dual Digital Isolators

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ISO7420, ISO7420M
ISO7421, ISO7421M
SLLS984A – JUNE 2009 – REVISED DECEMBER 2009
Low-Power Dual Digital Isolators
Check for Samples: ISO7420, ISO7420M, ISO7421, ISO7421M
FEATURES
1
•2 Highest Signaling Rate: up to 250 Mbps
• Low Power Consumption, Typical I_CC per
Channel:
– 2.2 mA at 25 Mbps, 4.2 mA at 100 Mbps
• Very Low Propagation Delay – 9 ns Typ. and
Very Low Skew – 300 ps Typ.
• Widest T_A Range Specified: –55°C to 125°C
• 4-kVpeak Maximum Isolation, 2.5 kVrms per
UL 1577, IEC/VDE and CSA Approved, IEC
60950-1, IEC 61010-1 End Equipment
Standards Approved. All Approvals Pending.
• 50 kV/μs Transient Immunity, Typical
• Over 25-Year Isolation Integrity at Rated
Voltage
• Operates From 3-V to 5.5-V Supply and Logic
Levels
APPLICATIONS
• Optocoupler Replacement in:
– Industrial Fieldbus
– Profibus
– Modbus
– DeviceNet™ Data Buses
– Servo Control Interface
– Motor Control
– Power Supplies
– Battery Packs
DESCRIPTION
The ISO7421 and ISO7421M provide galvanic isolation up to 2.5 kVrms for 1 minute per UL. These digital
isolators have two isolated channels. Each isolation 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.
The devices have TTL input thresholds and require two supply voltages from 3 V to 5.5 V, or any combination.
All inputs are 5-V tolerant when supplied from a 3-V supply.
ISO7420
D Package
(Top View)
ISO7421
D Package
(Top View)
V_CC1
1
INA 2
INB 3
GND1 4
8
V_CC2
V_CC1
1
7 OUTA OUTA 2
6 OUTB
INB 3
5 GND2 GND1 4
8
V_CC2
7 INA
6 OUTB
5 GND2
P0066-08
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DeviceNet is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated