ISO7421FEDR

Part: ISO742x — Texas Instruments

Type: Low-Power Dual Channel Digital Isolator

Description: The ISO742x is a dual-channel digital isolator providing galvanic isolation up to 2500 VRMS (UL 1577) and 4242 VPK (VDE) with signaling rates greater than 50 Mbps, low propagation delay of 7 ns typical, and operating from 3-V to 5.5-V supply levels.

Operating Conditions:

• Supply voltage: 3–5.5 V
• Operating temperature: -40 to 125 °C
• Signaling rate: 0–50 Mbps

Absolute Maximum Ratings:

• Max supply voltage: 6 V
• Max continuous current: ±15 mA
• Max junction/storage temperature: 150 °C

Key Specs:

• High-level output voltage (IOH = -4 mA): VCCO - 0.8 V (min), 4.6 V (typ)
• Low-level output voltage (IOL = 4 mA): 0.2 V (typ), 0.4 V (max)
• Input threshold voltage hysteresis: 400 mV (typ)
• High-level input current: 10 μA (max)
• Low-level input current: -10 μA (min)
• Common-mode transient immunity: 25 kV/μs (min), 50 kV/μs (typ)
• Supply current for VCC1 (DC to 1 Mbps, CL = 15 pF): 0.4 mA (typ), 0.8 mA (max)
• Supply current for VCC2 (DC to 1 Mbps, CL = 15 pF): 3.4 mA (typ), 5 mA (max)

Features:

• Signaling Rate > 50 Mbps
• Default Output 'High' and 'Low' Options
• Low Power Consumption: Typical ICC 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
• 50-KV/μs Transient Immunity, Typical
• Isolation Barrier Life: > 25 Years
• 3.3-V and 5-V Level Translation
• Safety and Regulatory Approvals: 4242 VPK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1; 2500 VRMS 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

Applications:

• Opto-Coupler Replacement in: Industrial FieldBus, ProfiBus, ModBus, DeviceNet™ Data Buses, Servo Control Interface, Motor Control, Power Supplies, Battery Packs

Package:

• SOIC (8) (4.90 mm x 3.91 mm)

• 1 · Signaling Rate > 50 Mbps

• Default Output 'High' and 'Low' Options

• Low Power Consumption: Typical ICC 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 TA Range Specified: -40°C to 125°C

• 50-KV/ μ s 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 VPK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1

• -2500 VRMS 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

• Opto-Coupler Replacement in:
• -Industrial FieldBus
• -ProfiBus
• -ModBus
• -DeviceNet™ Data Buses
• -Servo Control Interface
• -Motor Control
• -Power Supplies
• -Battery Packs

TA = -40°C to 125°C

ISO742x utilize single-ended TTL-logic switching technology. Its supply voltage range is from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, it is important to keep in mind that due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (i.e. μ C or UART), and a data converter or a line transceiver, regardless of the interface type or standard.