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HDMIULC6-4SC6Y

P1-P3P4-P6P7-P9P10-P12
HDMIULC6-4SC6Y Technical information
Doc ID 018879 Rev 2 7/12
It’s the reason why some recommendations have to be followed (see Section 3.3: How to
ensure good ESD protection).
Figure 10. ESD behavior: parasitic phenomena due to unsuitable layout
3.3 How to ensure good ESD protection
While the HDMIULC6-4SC6Y 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 10 and
Figure 11 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 11. ESD behavior: layout
optimization
Figure 12. ESD behavior: measurement
conditions
Unsuitable layout
Optimized layout
TEST BOARD
Vbus
ESD SURGE
OUT
IN
HDMIULC6
-
4SC6HDMIULC6
-
4SC6
Technical information HDMIULC6-4SC6Y
8/12 Doc ID 018879 Rev 2
Note: The measurements have been done with the HDMIULC6-4SC6Y 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 15. Crosstalk phenomena
The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor (
12
or
21
) increases when the gap across lines decreases, particularly in silicon dice. In the
example above the expected signal on load R
L2
is
2
V
G2
, in fact the real voltage at this point
has got an extra value
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 k).
Figure 13. Figure 14.
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
HDMIULC6-4SC6Y Technical information
Doc ID 018879 Rev 2 9/12
Figure 16. Analog crosstalk measurements
Figure 16 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 17).
Figure 17. Analog crosstalk results
As the HDMIULC6-4SC6Y is designed to protect high speed data lines, it must ensure a
good transmission of operating signals. The frequency response (Figure 5.) gives
attenuation information and shows that the HDMIULC6-4SC6Y is well suitable for data line
transmission up to 3.2 Gb/s.
NETWORK ANALYSER
PORT 2
NETWORK ANALYSER
PORT 1
TEST BOARD
NETWORK ANALYSER
PORT 2
NETWORK ANALYSER
PORT 1
TEST BOARD
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-P12

HDMIULC6-4SC6Y

Mfr. #:
Buy HDMIULC6-4SC6Y
Manufacturer:
STMicroelectronics
Description:
TVS Diodes / ESD Suppressors Automotive ultra large bandwidth ESD protection
Lifecycle:
New from this manufacturer.
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