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PDF IP4777CZ38 Data sheet ( Hoja de datos )
| Número de pieza | IP4777CZ38 | |
| Descripción | DVI and HDMI interface ESD protection | |
| Fabricantes | NXP Semiconductors | |
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IP4777CZ38
DVI and HDMI interface ESD protection, DDC buffering,
hot plug control and backdrive protection
Rev. 02 — 12 February 2009
Product data sheet
1. General description
The IP4777CZ38 is designed for HDMI transmitter host interface protection. The
IP4777CZ38 includes DDC buffering and decoupling, hot plug detect, backdrive
protection, CEC slew rate control, and high-level ESD protection diodes for the TMDS
lines.
The DDC lines use a new buffering concept which decouples the internal capacitive load
from the external capacitive load. This allows greater design flexibility of the DDC lines
with respect to the maximum load of 50 pF specified in the HDMI 1.3 specification. This
buffering also boosts the DDC signals, allowing the use of longer HDMI cables having a
higher capacitive load than 700 pF. The CEC slew rate limiter prevents ringing on the CEC
line. The internal hot plug detect module simplifies the application of the HDMI transmitter
to control the hot plug signal.
The DDC, hot plug and CEC lines are backdrive protected to guarantee HDMI interface
signals are not pulled down if the system is powered down or enters standby mode.
All TMDS intra-pairs are protected by a special diode configuration offering a low line
capacitance of 0.7 pF only (to ground) and 0.05 pF between the TMDS pairs. These
diodes provide protection to components downstream from ESD voltages of up to ±8 kV
contact in accordance with the IEC 61000-4-2, level 4 standard.
2. Features
I HDMI 1.3 compliant
I Pb-free and RoHS compliant; Dark Green
I Robust ESD protection without degradation after several ESD strikes
I Low leakage even after several hundred ESD discharges
I Very high diode switching speed (ns) and low line capacitance of 0.7 pF to ground and
0.05 pF between channel can ensure signal integrity
I DDC capacitive decoupling between system side and HDMI connector side and
buffering to drive cable with high capacitive load (> 700 pF)
I Hot plug detect module
I CEC ringing prevention by slew rate limiter
I All TMDS lines with integrated rail-to-rail clamping diodes with downstream ESD
protection of ±8 kV in accordance with IEC 61000-4-2, level 4 standard
I Matched 0.5 mm trace spacing
1 page  
NXP Semiconductors
IP4777CZ38
DVI and HDMI interface ESD protection
6.2 Pin description
www.datasheet4u.com
IP4777CZ38_2
Product data sheet
Table 2. Pin description
Symbol
Pin
Description
IP4777CZ38 IP4777CZ38/V[1]
VCC(5V0)
11
supply voltage for DDC and hot plug
circuits
ENABLE
22
enable input for DDC and hot plug
circuits
GND
33
ground for DDC, hot plug and CEC
circuits
TMDS_D2+
44
ESD protection TMDS channel D2+
n.c.
56
not connected
TMDS_GND 6 5
ground for TMDS channel
TMDS_D1+
77
ESD protection TMDS channel D1+
n.c.
89
not connected
TMDS_GND 9 8
ground for TMDS channel
TMDS_D0+
10 10
ESD protection TMDS channel D0+
n.c.
11 12
not connected
TMDS_GND
12 11
ground for TMDS channel
TMDS_CLK+
13 13
ESD protection TMDS channel CLK+
n.c.
14 15
not connected
TMDS_GND
15 14
ground for TMDS channel
CEC_IN
16 16
CEC signal input to system controller
DDC_CLK_IN 17 17
DDC clock input to system controller
DDC_DAT_IN 18 18
DDC data input to system controller
HOT_PLUG_DET_IN 19
19
hot plug detect input from system
GPIO
HOT_PLUG_DET_OUT 20
20
hot plug detect output to HDMI
connector
DDC_DAT_OUT
21
21
DDC data output to HDMI connector
DDC_CLK_OUT
22
22
DDC clock output to HDMI connector
CEC_OUT
23 23
CEC signal output to HDMI connector
TMDS_GND
24 25
ground for TMDS channel
TMDS_CLK−
25 24
ESD protection TMDS channel CLK−
n.c.
26 26
not connected
TMDS_GND
27 28
ground for TMDS channel
TMDS_D0−
28 27
ESD protection TMDS channel D0−
n.c.
29 29
not connected
TMDS_GND
30 31
ground for TMDS channel
TMDS_D1−
31 30
ESD protection TMDS channel D1−
n.c.
32 32
not connected
TMDS_GND
33 34
ground for TMDS channel
TMDS_D2−
34 33
ESD protection TMDS channel D2−
n.c.
35 35
not connected
Rev. 02 — 12 February 2009
© NXP B.V. 2009. All rights reserved.
5 of 25
5 Page 
NXP Semiconductors
IP4777CZ38
DVI and HDMI interface ESD protection
www.datasheet4u.com
input: board side
tPLH
output: connector side
0.7 V
1.5 V
a. Propagation delay tPLH
input: board side
3.3 V
5.0 V
001aah611
3.3 V
1.65 V
output: connector side
tPHL
tPLH
0.1 V
80 %
2.5 V
20 %
0.3VCC(5V0)
tTHL
(1) Dotted line indicates effect without slew rate accelerator.
b. Propagation delay tPHL and transition time
Fig 4. Board side to connector side operation
(1)
tTLH
VOL
5.0 V
001aah612
IP4777CZ38_2
Product data sheet
Rev. 02 — 12 February 2009
© NXP B.V. 2009. All rights reserved.
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| PDF Descargar | [ Datasheet IP4777CZ38.PDF ] | |
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