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HDMIULC6-4SC6

P1-P3P4-P6P7-P9P10-P11
HDMIULC6-4SC6 Technical information
7/11
It’s the reason why some recommendations have to be followed (see Section 3.3: How to
ensure good ESD protection).
Figure 9. ESD behavior: parasitic phenomena due to unsuitable layout
3.3 How to ensure good ESD protection
While the HDMIULC6-4SC6 provides a high immunity to ESD surge, an efficient protection
depends on the layout of the board. In the same way, with the rail to rail topology, the track
from data lines to I/O pins, from V
CC
to V
BUS
pin, and from GND plane to GND pin must be
as short as possible to avoid over voltages due to parasitic phenomena (see Figure 9 and
Figure 10 for layout considerations).
V
BUS
Data line
V
CL
L
VBUS
L
I/O
L
GND
V
TRANSIL
ESD surge
on data line
V
F
dt
di
L
I/O
dt
di
L
I/O
dt
di
L
GND
dt
di
L
GND
V
cc
pin
I/O pin
GND pin
V
BUS
Data line
V
CL
L
VBUS
L
I/O
L
GND
V
TRANSIL
ESD surge
on data line
V
F
dt
di
L
I/O
dt
di
L
I/O
dt
di
L
GND
dt
di
L
GND
V
cc
pin
I/O pin
GND pin
0surge
dt
di
L
dt
di
LVV
0surge
dt
di
L
dt
di
LVVV
GNDI/OFCL
GNDI/OFTRANSILCL
<---=
>+++=
-
+
tr=1ns
t
V
CL-
NEGATIVE
SURGE
dt
di
L
dt
di
L
GNDI/O
--
dt
di
L
dt
di
L
GNDI/O
--
-V
F
tr=1ns
t
V
CL-
NEGATIVE
SURGE
dt
di
L
dt
di
L
GNDI/O
--
dt
di
L
dt
di
L
GNDI/O
--
-V
F
V
TRANSIL
+V
F
tr=1ns
t
V
CL+
dt
di
L
dt
di
L
GNDI/O
+
POSITIVE
SURGE
tr=1ns
t
V
CL+
dt
di
L
dt
di
L
GNDI/O
+
dt
di
L
dt
di
L
GNDI/O
+
POSITIVE
SURGE
V
TRANSIL
+V
F
tr=1ns
t
V
CL+
dt
di
L
dt
di
L
GNDI/O
+
dt
di
L
dt
di
L
GNDI/O
+
POSITIVE
SURGE
tr=1ns
t
V
CL+
dt
di
L
dt
di
L
GNDI/O
+
dt
di
L
dt
di
L
GNDI/O
+
POSITIVE
SURGE
Rd.IpVV
BRTRANSIL
+=
Figure 10. ESD behavior: layout
optimization
Figure 11. ESD behavior: measurement
conditions
Unsuitable layout
Optimized layout
TEST BOARD
Vbus
ESD SURGE
OUT
IN
HDMIULC6
-
4SC6HDMIULC6
-
4SC6
Technical information HDMIULC6-4SC6
8/11
Note: The measurements have been done with the HDMIULC6-4SC6 in open circuit.
IMPORTANT:
An important precaution to take is to put the protection device as close as possible to the
disturbance source (generally the connector).
3.4 Crosstalk behavior
Figure 14. Crosstalk phenomena
The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor (β
12
or
β
21
) increases when the gap across lines decreases, particularly in silicon dice. In the
example above the expected signal on load R
L2
is α
2
V
G2
, in fact the real voltage at this point
has got an extra value β
21
V
G1
. This part of the V
G1
signal represents the effect of the
crosstalk phenomenon of the line 1 on the line 2. This phenomenon has to be taken into
account when the drivers impose fast digital data or high frequency analog signals in the
disturbing line. The perturbed line will be more affected if it works with low voltage signal or
high load impedance (few kΩ).
Figure 12. Remaining voltage after the
HDMIULC6-4SC6 during
positive ESD surge
Figure 13. Remaining voltage after the
HDMIULC6-4SC6 during
negative ESD surge
Line 1
Line 2
V
G1
V
G2
R
G1
R
G2
DRIVERS
R
L1
R
L2
RECEIVERS
α
β
+
1
12
V
G1
V
G2
α
β
+
2
21
V
G2
V
G1
HDMIULC6-4SC6 Technical information
9/11
Figure 15. Analog crosstalk measurements
Figure 15 gives the measurement circuit for the analog application. In usual frequency range
of analog signals (up to 240 MHz) the effect on disturbed line is less than -45 dB (see
Figure 16).
Figure 16. Analog crosstalk results
As the HDMIULC6-4SC6 is designed to protect high speed data lines, it must ensure a good
transmission of operating signals. The frequency response (Figure 4.) gives attenuation
information and shows that the HDMIULC6-4SC6 is well suitable for data line transmission
up to 3.2 Gb/s.
NETWORK ANALYSER
PORT 2
NETWORK ANALYSER
PORT 1
TEST BOARD
Vbus
100.0k 1.0M 10.0M 100.0M 1.0G
- 120.00
- 90.00
- 60.00
- 30.00
0.00
dB
F (Hz)
P1-P3P4-P6P7-P9P10-P11

HDMIULC6-4SC6

Mfr. #:
Buy HDMIULC6-4SC6
Manufacturer:
STMicroelectronics
Description:
TVS Diodes / ESD Suppressors ESD PROTECTION
Lifecycle:
New from this manufacturer.
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