Si87xx
5
K
V L E D E
M U L A T O R
I
N P U T
, O
P E N
C
O LL EC TO R
O
UTPUT
I
SOLATORS
Features
Pin-compatible, drop-in upgrades for
popular high-speed digital
optocouplers
Performance and reliability
advantages vs. optocouplers
Resistant to temperature, age and
forward current effects
10x lower FIT rate for longer
service life
Higher common-mode transient
immunity: >50 kV/µs typical
Lower power and forward input
diode current
PCB footprint compatible with
optocoupler packaging
Wide range of product options
1 channel diode emulator input
3 to 30 V open collector output
Propagation delay 30 ns
Data rates dc to 15 Mbps
3.75 and 5 kV reinforced isolation
UL, CSA, VDE
Wide operating temperature range
–40 to +125 °C
RoHS-compliant packages
SOIC-8
DIP8
SDIP6
LGA8
Pin Assignments:
See page 18
SOIC-8, DIP8, LGA8
Open Collector Output
Applications
Industrial automation
Isolated data acquisition
Motor controls and drives
Test and measurement equipment
Isolated switch mode power supplies
SDIP6
Open Collector Output
Safety Regulatory Approvals (Pending)
UL 1577 recognized
Up
VDE certification conformity
IEC
to 5000 Vrms for 1 minute
CSA component notice 5A
approval
IEC
60747-5-2 (VDE 0884 Part 2)
(reinforced insulation)
CQC certification approval
GB4943.1
60950-1, 61010-1, 60601-1
(reinforced insulation)
Description
The Si87xx isolators are pin-compatible, one-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 Si87xx 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 Si87xx series offer longer service life and
dramatically higher reliability compared to optocouplers. Ordering options
include open collector output with and without integrated pull-up resistor
and output enable options.
SOIC-8, DIP8, LGA8
Open Collector Output
with 20 k Pull-up Resistor
SOIC-8, DIP8, LGA8
Open Collector Output
with Output Enable
Patent pending
Preliminary Rev. 0.5 9/12
Copyright © 2012 by Silicon Laboratories
Si87xx
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Si87xx
Functional Block Diagram
Diode
Emulator
VDD
A1
Output
Stage
(Open-Collector)
XMIT
I
F
REC
OUT
C1
GND
2
Preliminary Rev. 0.5
Si87xx
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1. Device Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2. Device Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Input Circuit Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2. Output Circuit Design and Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . 15
5. Pin Descriptions (SOIC-8, DIP8, LGA8) Open Collector . . . . . . . . . . . . . . . . . . . . . . . . . 16
6. Pin Descriptions (SOIC-8, DIP8, LGA8) Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . 17
7. Pin Descriptions (SDIP6) Open Collector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8. Pin Descriptions (SOIC-8, DIP8, LGA8) 20 k Pull-Up Resistor . . . . . . . . . . . . . . . . . . 19
9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10. Package Outline: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11. Land Pattern: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
12. Package Outline: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
13. Land Pattern: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
14. Package Outline: SDIP6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
15. Land Pattern: SDIP6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
16. Package Outline: LGA8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
17. Land Pattern: LGA8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
18. Top Marking: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
19. Top Marking: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
20. Top Marking: SDIP6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
21. Top Marking: LGA8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Preliminary Rev. 0.5
3
Si87xx
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
V
DD
Supply Voltage
(Open Collector Output)
Input Current
Si87xxA Devices
Si87xxB Devices
Si87xxC Devices
Operating Temperature (Ambient)
Symbol
V
DD
I
F(ON)
3
6
3
T
A
–40
—
—
—
—
15
30
15
125
mA
mA
mA
°C
Min
3
Typ
—
Max
30
Unit
V
Table 2. Electrical Characteristics
V
DD
= 5 V; GND = 0 V; T
A
= –40 to +125 °C; typical specs at 25 °C
Parameter
DC Parameters
Supply Voltage
Supply Current
Input Current Threshold
Symbol
V
DD
I
DD
I
F(TH)
Test Condition
Open collector output
Output high or low (V
DD
= 5 to 30 V)
Si87xxA devices
Si87xxB devices
Si87xxC devices
Si87xxA devices
Si87xxB devices
Si87xxC devices
Min
3
—
3
6
3
—
—
—
—
1.7
–0.3
Typ
—
—
—
—
—
0.17
0.34
0.17
—
—
—
Max
30
1.7
—
—
—
—
—
—
1
2.8
—
Unit
V
mA
mA
mA
mA
mA
mA
mA
V
V
V
Input Current Rising
Edge Hysteresis
Input Forward Voltage
(OFF)
Input Forward Voltage
(ON)
Input Reverse
Breakdown Voltage
Input Capacitance
I
HYS
V
F(OFF)
Measured at ANODE with respect to
CATHODE.
V
F(ON)
BVR
C
I
Measured at ANODE with respect to
CATHODE.
Ensures that reverse current is lim-
ited to a safe level.
f = 100 kHz,
V
F
= 0 V,
V
F
= 2 V
I
OL
= 3 mA, V
DD
= 3.3 or 5 V
I
OL
= 13 mA, V
DD
= 5.5 V
V
DD
= V
OUT
= 5.5 V
V
DD
= V
OUT
= 24 V
Peak DC collector current drive
(V
DD
= 5 V)
Using internal pull-up
—
—
—
—
—
—
—
—
—
2
—
15
15
—
—
—
—
50
—
20
—
—
20
–10
—
—
0.4
0.7
0.5
1
—
54
—
30
0.8
—
0
pF
pF
V
V
µA
µA
mA
k
V
V
µA
µA
Logic Low Output
Voltage
Logic High Output
Current
Peak Output Current
Output Low Impedance
Pull-up Resistor
Enable High Min
Enable Low Max
Enable High Current
Draw
Enable Low Current
Draw
4
V
OL
I
OH
I
OPK
R
OL
R
PU
V
EH
V
EL
I
EH
I
EL
V
DD
= V
EH
= 5 V
V
DD
= 5 V, V
EL
= 0 V
—
—
Preliminary Rev. 0.5
Si87xx
Table 2. Electrical Characteristics (Continued)
V
DD
= 5 V; GND = 0 V; T
A
= –40 to +125 °C; typical specs at 25 °C
Parameter
Maximum Data Rate
Symbol
F
DATA
Test Condition
Si87xxA devices
Si87xxB devices
Si87xxC devices
Si87xxA devices
Si87xxB devices
Si87xxC devices
C
L
= 15 pF using 350
pull-up
C
L
= 15 pF using 350
pull-up
| t
PLH
– t
PHL
|
Min
DC
DC
DC
66
66
1
—
—
—
—
Typ
—
—
—
—
—
—
—
—
—
—
Max
15
15
1
—
—
—
60
60
20
20
Unit
M
BPS
M
BPS
M
BPS
ns
ns
µs
ns
ns
ns
ns
AC Switching Parameters (V
DD
= 5 V, R
L
= 350
,
C
L
= 15 pF)
Minimum Pulse Width
MPW
Propagation Delay
(Low-to-High)
Propagation Delay
(High-to-Low)
Pulse Width Distortion
Propagation Delay
Skew
t
PLH
t
PHL
PWD
t
PSK(p-p)
t
PSK(P-P)
is the magnitude of the dif-
ference in prop delays between dif-
ferent units operating at same supply
voltage, load, and ambient temp.
t
R
t
F
t
START
CMTI
Output = low or high
I
F
= 3 mA for Si87xxA devices
I
F
= 6 mA for Si87xxB devices
I
F
= 3 mA for Si87xxC devices
C
L
= 15 pF using 350
pull-up
C
L
= 15 pF using 350
pull-up
Rise Time
Fall Time
Device Startup Time
Common Mode
Transient Immunity
—
—
—
20
35
20
15
5
—
35
50
35
—
—
40
—
—
—
ns
ns
µs
kV/µs
kV/µs
kV/µs
Preliminary Rev. 0.5
5
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