3 Description
The ISO7821 is a high-performance, dual-channel digital isolator with 8000 VPK isolation voltage. This device has reinforced isolation certifications according to VDE, CSA, CQC, and TUV. The isolator provides high electromagnetic immunity and low emissions at low power consumption, while isolating CMOS or LVCMOS digital I/O’s. Each isolation channel has a logic input and output buffer separated by silicon dioxide (SiO2) insulation barrier. ISO7821 has one forward and one reverse-direction channel. If the input power or signal is lost, default output is 'high' for the ISO7821 and 'low' for the ISO7821F device. Used in conjunction with isolated power supplies, this device prevents noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. Through innovative chip design and layout techniques, electromagnetic compatibility of ISO7821 has been significantly enhanced to ease system-level ESD, EFT, Surge and Emissions compliance. ISO7821 is available in 16-pin SOIC wide-body (DW) and extra-wide body (DWW) packages. The DWW package option comes with enable pins which can be used to put the respective outputs in high impedance for multi-master driving applications and to reduce power consumption.
Device Information(1)
PART NUMBER |
PACKAGE |
BODY SIZE (NOM) |
ISO7821, ISO7821F |
SOIC, DW (16) |
10.30 mm x 7.50 mm |
Extra wide SOIC, DWW (16) |
10.30 mm × 14.0 mm |
- For all available packages, see the orderable addendum at the end of the datasheet.
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4 Revision History
Changes from E Revision (December 2015) to F Revision
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Changed the Safety and Regulatory Approvals list of Features Go
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Added Features "TUV Certification per EN 61010-1 and EN 60950-1" Go
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Changed text in the first paragraph of the Description From: "certifications according to VDE, CSA, and CQC". To: "certifications according to VDE, CSA, CQC, and TUV." Go
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Added Note 1 to Table 2 Go
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Added TUV to the Regulatory Information section and Table 4. Deleted Note 1 in Table 4 Go
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Changed Figure 15 Go
Changes from D Revision (July 2015) to E Revision
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Changed Features From: 8000 VPK VIOTM and 2121 VPK VIORM Reinforced..To: 8000 VPK Reinforced...Go
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Added Features: DW Package Certifications Complete; DWW Certifications Planned Go
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Added text to the Description: and extra-wide body (DWW) packages...Go
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Added package: Extra wide SOIC, DWW (16) to the Device Information table Go
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Added the DWW pinout image Go
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Added the DWW package to the Thermal Information Go
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Changed the MIN value of CMTI in Electrical Characteristics, 5 V table From: 70 To: 100 kV/µs, deleted the TYP value of 100 kV/µs Go
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Added the DW package value to the Supply Current section of the Electrical Characteristics, 5 VGo
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Added the DWW package value to the Supply Current section of the Electrical Characteristics, 5 VGo
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Changed the MIN value of CMTI in Electrical Characteristics, 3.3 V table From: 70 To: 100 kV/µs, deleted the TYP value of 100 kV/µs Go
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Added the DW package value to the Supply Current section of the Electrical Characteristics, 3.3 VGo
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Added the DWW package value to the Supply Current section of the Electrical Characteristics, 3.3 V Go
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Changed the MIN value of CMTI in Electrical Characteristics, 2.5 V table From: 70 To: 100 kV/µs, deleted the TYP value of 100 kV/µs Go
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Added the DW package value to the Supply Current section of the Electrical Characteristics, 2.5 VGo
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Added the DWW package value to the Supply Current section of the Electrical Characteristics, 2.5 V Go
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Added tPHZ, tPLZ, tPZH, and tPZL to Switching Characteristics, 3.3 VGo
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Added tPHZ, tPLZ, tPZH, and tPZL to Switching Characteristics, 2.5 VGo
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Added Figure 8 Go
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Added the DWW package to Table 1Go
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Changed CIO typ value From: 2 To 1 pF in Table 1 Go
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Added the DWW package to Table 2Go
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Changed Parameter information and added the DWW package information in Table 3 Go
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Added the DWW package information to Table 4Go
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added DWW-16 package options to Table 5 Go
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Changed Table 6 Go
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Added text to the Application Information section: "isolation voltage per UL 1577." Go
Changes from C Revision (May 2015) to D Revision
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Added device ISO7821F to the datasheet Go
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Changed the Description to include: "default output is 'high' for the ISO7821 device and 'low' for the ISO7821F device. Go
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Changed the Simplified Schematic Go
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Changed tPLH and tPHL From: 5.5 V to 5 V in Figure 6 Go
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Changed Figure 9 Go
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Changed the Functional Block Diagram Go
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Changed Table 1 title From: IEC Insulation and Safety-Related Specifications for DW-16 Package To: Package Insulation and Safety-Related Specifications Go
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Changed Figure 13 , Added Figure 14Go
Changes from B Revision (April 2015) to C Revision
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Changed From: VCC1 and VCC2 To: VCCI and VCCO, GND1 and GND2 To: GNDI and GNDO and added Notes 1 and 2 in the Simplified Schematic Go
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Changed the MIN value of CMTI in Electrical Characteristics, 5 V table From: 50 To: 70 kV/µs Go
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Changed the MIN value of CMTI in Electrical Characteristics, 3.3 V table From: 50 To: 70 kV/µs Go
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Changed the MIN value of CMTI in Electrical Characteristics, 2.5 V table From: 50 To: 70 kV/µs Go
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Added sentence "If the EN pin is available and low then the output goes to high impedance." to the Overview section Go
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Changed the Functional Block Diagram to include the EN pin on the Receiver sideGo
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Changed the Installation classification of the Table 3 to include DW package informationGo
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Changed "ISO782W functional modes" To: "ISO7821DW functional modes" in Device Functional ModesGo
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Changed Table 6 title From: "Functional Table" To: "ISO7821DW Function Table"Go
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Added the Device I/O Schematics section Go
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Changed device number ISO7821 To: ISO7821DW in Figure 17Go
Changes from A Revision (December 2014) to B Revision
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Changed the document title From: "Channel Digital Isolator" To: "Channel 1/1 Digital Isolator" Go
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Added Features: 2.25 V to 5.5 V Level TranslationGo
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Changed the Safety and Regulatory Approvals list of Features Go
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Changed text in the Description From: "This device is being reviewed for reinforced isolation certification by VDE and CSA. To: "This device has reinforced isolation certifications according to VDE, CSA, and CQC."Go
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Added Note (3) to the Absolute Maximum Ratings tableGo
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Changed From: VCCX To: VCCO In IOH and IOL of the Recommended Operating Conditions table Go
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Changed From: VCCX To: VCCI In VIH and VIL of the Recommended Operating Conditions table Go
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Changed Note (1) of the Recommended Operating Conditions table Go
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Added the Power Dissipation Characteristics table Go
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Changed From: VCCX To: VCCO In VOH of the Electrical Characteristics, 5 V table Go
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Changed From: VCCX To: VCCO In VI(HYS) of the Electrical Characteristics, 5 V table Go
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Changed From: VCCX To: VCCI In IIH of the Electrical Characteristics, 5 V table Go
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Changed From: VCCX To: VCCI In CMTI of the Electrical Characteristics, 5 V table Go
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Changed From: VCCX To: VCCI In Supply Current, DC Signal of the Electrical Characteristics, 5 V tableGo
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Changed Note (1) of the Electrical Characteristics, 5 V table Go
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Changed From: VCCX To: VCCO In VOH of the Electrical Characteristics, 3.3 V table Go
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Changed From: VCCX To: VCCO In VI(HYS) of the Electrical Characteristics, 3.3 V table Go
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Changed From: VCCX To: VCCI In IIH of the Electrical Characteristics, 3.3 V tableGo
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Changed From: VCCX To: VCCI In CMTI of the Electrical Characteristics, 3.3 V table Go
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Changed From: VCCX To: VCCI In Supply Current, DC Signal of the Electrical Characteristics, 3.3 V table Go
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Changed Note (1) of the Electrical Characteristics, 3.3 V table Go
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Changed From: VCCX To: VCCO In VOH of the Electrical Characteristics, 2.5 V table Go
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Changed From: VCCX To: VCCI In IIH of the Electrical Characteristics, 2.5 V table Go
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Changed From: VCCX To: VCCI In Supply Current, DC Signal of the Electrical Characteristics, 2.5 V table Go
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Changed Note (1) of the Electrical Characteristics, 2.5 V table Go
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Changed Figure 7 Go
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Changed From: VCC1 To: VCCI in Figure 9 Go
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Changed Figure 10 Go
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Changed the Test Condition of CTI in Table 1 Go
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Changed the MIN value of CTI From" > 600 V To: 600 VGo
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Changed Table 2 title From: DIN V VDE 0884-10 (VDE V 0884-10) and UL 1577 Insulation Characteristics To: Added the DWW package toGo
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Changed Table 2 Go
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Changed columns VDE and CSA to Table 4Go
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Changed title From: IEC Safety Limiting Values To: Safety Limiting ValuesGo
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Changed the table in Safety Limiting Values, added IS DW-16 package optionsGo
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Changed Figure 13 Go
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Deleted INPUT-SIDE and OUTPUT-SIDE from columns 1 and 2 of Table 6 Go
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Changed Note (1) of Table 6 Go
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Changed the Application Information sectionGo
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Changed the Typical Application section and Figure 16Go
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Added text and Figure 17 to the Detailed Design Procedure section Go
Changes from * Revision (November 2014) to A Revision
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Changed From: A product preview that included only page 1 and the pinout section To: A complete data sheet Go
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Added Note: "This coupler..." to the High Voltage Feature Description section Go