Document
Si871x/2x
5 KV LED EMULATOR INPUT, LOGIC OUTPUT ISOLATORS
Features
High Speed: dc to 15 Mbps
Wide range of product options
2.5 to 5.5 V logic output
Inverting and non-inverting
Pin-compatible, drop-in upgrades for Disable output high, low or tri-state
popular high-speed digital
1 channel diode emulator input
optocouplers
Propagation delay 30 ns
Performance and reliability advantages vs. optocouplers
Up to 5000 VRMS isolation 10 kV surge withstand capability
Resistant to temperature, age and
forward current effects 10x lower FIT rate for longer
service life
AEC-Q100 qualified Wide operating temperature range – 40 to +125 °C
Higher common-mode transient RoHS-compliant packages
immunity: >50 kV/µs typical
SOIC-8 (Narrow body)
Lower power and forward input diode current
DIP8 (Gull-wing) SDIP6 (Stretched SO-6)
Applications
Industrial automation
Isolated data acquisition
Motor controls and drives
Test and measurement equipment
Isolated switch mode power supplies
Safety Regulatory Approvals (Pending)
UL 1577 recognized
Up to 5000 Vrms for 1 minute CSA component notice 5A
approval
IEC 60950-1, 61010-1, 60601-1 (reinforced insulation)
VDE certification conformity
IEC60747-5-2/VDE0884-10 (basic/reinforced insulation)
CQC certification approval
GB4943.1
Description
The Si871x/2x isolators are pin-compatible, single-channel, drop-in replacements for popular optocouplers with data rates up to 15 Mbps. These devices isolate high-speed digital signals and offer performance, reliability, and flexibility advantages not available with optocoupler solutions. The Si871x/2x series is based on Silicon Labs' proprietary CMOS isolation technology for low-power and high-speed operation and are resistant to the wear-out effects found in optocouplers that degrade performance with increasing temperature, forward current, and device age. As a result, the Si871x/2x series offer longer service life and dramatically higher reliability compared to optocouplers. Ordering options include logic output with and without output enable options.
Pin Assignments: See page 21
NC 1
ANODE 2 CATHODE 3
e
UVLO
8 VDD 7 NC 6 VO
NC 4
5 GND
SOIC-8, DIP8 Industry Standard Pinout
NC 1
8 VDD
UVLO
ANODE 2 CATHODE 3
e
7 EN 6 VO
NC 4
5 GND
SOIC-8, DIP8 with Output Enable Industry Standard Pinout
ANODE 1 NC 2
e
CATHODE 3
6 VDD
UVLO
5 VO
4 GND
SDIP6 Industry Standard Pinout
Patent pending
Rev. 1.0 8/14
Copyright © 2014 by Silicon Laboratories
Si871x/2x
Si871x/2x
Functional Block Diagram
Diode Emulator
A1
IF
C1
XMIT
REC
VDD
Output Stage
(Logic Out)
OUT GND
2 Rev. 1.0
TABLE OF CONTENTS
Si871x/2x
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3. Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 3.1. Device Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.2. Device Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.3. Under Voltage Lockout (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1. Input Circuit Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2. Output Circuit Design and Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . 18
5. Pin Descriptions (SOIC-8, DIP8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6. Pin Descriptions (SOIC-8, DIP8) with Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7. Pin Descriptions (SDIP6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9. Package Outline: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 10. Land Pattern: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 11. Package Outline: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 12. Land Pattern: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .