ISO7420_10 Datasheet, PDF (1/20 Pages) Texas Instruments – Low-Power Dual Digital Isolators

ISO7420, ISO7420M
ISO7421, ISO7421M
www.ti.com
SLLS984D – JUNE 2009 – REVISED JULY 2010
Low-Power Dual Digital Isolators
Check for Samples: ISO7420, ISO7420M, ISO7421, ISO7421M
FEATURES
1
•2 Highest Signaling Rate: 1 Mbps
• Low Power Consumption, Typical I_CC per
Channel (3.3V operation):
– ISO7420: 1.1 mA, ISO7421: 1.5 mA
• Low Propagation Delay – 9 ns Typ. and Low
Skew – 300 ps Typ.
• Wide T_A Range Specified: –40°C to 125°C
• 4-kVpeak Maximum Isolation, 2.5 kVrms per
UL 1577, IEC/VDE and CSA Approvals, IEC
60950-1, IEC 61010-1 End Equipment
Standards Approvals. All Approvals Pending.
• 50 kV/ms Transient Immunity, Typical
• Over 25-Year Isolation Integrity at Rated
Voltage
• Operates From 3.3V and 5V 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 ISO7420, ISO7420M, 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 suffix M indicates wide temperature range (–40°C to 125°C).
The devices have TTL input thresholds and require two supply voltages, 3.3V or 5V, or any combination. All
inputs are 5-V tolerant when supplied from a 3.3V supply.
Note: The ISO7420 and ISO7421 are specified for signaling rates up to 1 Mbps. Due to their fast response time,
under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add
external filtering to remove spurious signals with input pulse duration < 20ns if desired.
SPACER
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
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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