IP4778CZ38 NXP Semiconductors, IP4778CZ38 Datasheet

The IP4778CZ38 is designed for HDMI receiver host interface protection

IP4778CZ38

Manufacturer Part Number
IP4778CZ38
Description
The IP4778CZ38 is designed for HDMI receiver host interface protection
Manufacturer
NXP Semiconductors
Datasheet

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Part Number:
IP4778CZ38
Quantity:
200
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IP4778CZ38,118
Manufacturer:
Maxim
Quantity:
50
1. General description
2. Features and benefits
The IP4778CZ38 is designed for HDMI receiver host interface protection.
The IP4778CZ38 includes DDC buffering, slew rate acceleration and decoupling, hot plug
control, backdrive protection, CEC slew rate control, optional multiplexing of DDC signals,
and high-level ESD protection diodes for all HDMI signals.
The DDC lines are buffered using a new buffering concept which decouples the internal
capacitive load from the external capacitive load. This allows higher PCB design flexibility
for the DDC lines with respect to a maximum load of 50 pF. 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 and greatly reduces
the number of discrete components needed by the CEC application. HDMI receiver and
system GPIO applications are simplified by an internal hot plug driver module and hot plug
control.
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.
IP4778CZ38
HDMI ESD protection, DDC buffering and hot plug control
Rev. 3 — 31 March 2011
Pb-free and RoHS compliant
Robust ESD protection without degradation after several ESD strikes
Low leakage even after several hundred ESD discharges
Very high diode switching speed (ns) and low line capacitance of 0.7 pF to ground and
0.05 pF between channels ensures signal integrity
DDC capacitive decoupling between system side and HDMI connector side and drive
cable buffering with capacitive load (> 700 pF)
Hot plug control for direct connection to system GPIO
CEC ringing prevention by slew rate limiter
DDC and hot plug enable signal for multiplexing and backdrive protection
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
Matched 0.5 mm trace spacing
Component count reduction of HDMI receiver application
Product data sheet

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IP4778CZ38 Summary of contents

Page 1

... General description The IP4778CZ38 is designed for HDMI receiver host interface protection. The IP4778CZ38 includes DDC buffering, slew rate acceleration and decoupling, hot plug control, backdrive protection, CEC slew rate control, optional multiplexing of DDC signals, and high-level ESD protection diodes for all HDMI signals. ...

Page 2

... Highest integration in a small footprint, PCB level, optimized RF routing, 38-pin TSSOP lead-free package Choice of system compatible or RF routing optimized pinning variants 3. Applications The IP4778CZ38 can be used for a wide range of HDMI sink devices e.g.: TV Projectors PC monitors HDMI buffer modules (extensions of HDMI cable length) HDMI picture performance quality enhancer modules 4 ...

Page 3

... V V CC(5V0) CC(3V3) HOT_PLUG_DET_IN DDC_CLK_OUT 10 μA V CC(3V3) CEC_IN DDC_DAT_OUT SLEW RATE LIMITER All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 TMDS_D0+ TMDS_CLK+ 5V0 TMDS_D0− TMDS_CLK− TMDS_BIAS V CC(5V0) SLEW RATE ACCELERATOR TMDS_BIAS V CC(5V0) SLEW RATE ACCELERATOR © ...

Page 4

... TMDS_GND 8 n.c. 9 IP4778CZ38/V 10 TMDS_D0+ 11 TMDS_GND n.c. 12 TMDS_CLK+ 13 TMDS_GND 14 15 n.c. 16 CEC_IN DDC_CLK_IN 17 DDC_DAT_IN 18 HOT_PLUG_DET_IN 19 Pin configuration of IP4778CZ38/V All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 38 TMDS_BIAS 37 V CC(3V3) 36 GND 35 n.c. 34 TMDS_D2− 33 TMDS_GND 32 n.c. 31 TMDS_D1− 30 TMDS_GND 29 n.c. 28 TMDS_D0− ...

Page 5

... All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Description supply voltage for DDC and hot plug circuits enable for DDC and hot plug circuits ground for DDC, hot plug and CEC [1] circuits ESD protection TMDS channel D2+ ...

Page 6

... IEC 61000-4-2, level 4 contact board side pins; IEC 61000-4-2, level 1 contact DDC operating at 100 kHz All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Description [2] not connected ESD protection TMDS channel D2− [1] ground for TMDS channel [2] ...

Page 7

... HIGH: DDC_DAT_OUT = V DDC_CLK_OUT = 5.5 V; CC(5V0) both channels LOW: DDC_DAT_IN = GND; DDC_CLK_IN = GND; DDC_DAT_OUT = open; DDC_CLK_OUT = open no pull-up resistor connected to V CC(3V3) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Min [1] - [ bias [ ...

Page 8

... CC(3V3) = 100 μ 3 3.3 V CC(3V3 3.0 V CC(3V3) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 ° unless otherwise specified. Min Typ Max 0.7 × CC(3V3) −0 ...

Page 9

... C; unless otherwise specified. amb Conditions HIGH = enable LOW = disable 5.5 V CC(3V3 enable control is needed. CC(3V3) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Min Typ [ [2] - 125 = GND; −1 +0.1 - 2.4 - 1.3 [3] ...

Page 10

... L L Figure 5 pin ENABLE = HIGH before start condition pin ENABLE = HIGH after stop condition = 3 5.0 V. CC(3V3) CC(5V0) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 ° unless otherwise specified. Min Typ 0.7 × CC(3V3) −0 −1 +0 ...

Page 11

... PLH 1. PHL THL and transition time PHL Board side to connector side operation All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 0.7 V 1.5 V 001aag034 0 PLH (1) 0.3V CC(5V0 TLH © NXP B.V. 2011. All rights reserved. ...

Page 12

... TMDS To protect the TMDS lines and also to comply with the impedance requirements of the HDMI specification, the IP4778CZ38 provides ESD protection with a low capacitive load. The dominant value for the TMDS line impedance is the capacitive load to ground. The IP4778CZ38 has a capacitive load of only 0.7 pF. ...

Page 13

... DDC output waveform IP4778CZ38 Product data sheet HDMI ESD protection, DDC buffering and hot plug control V CC(5V0) ENABLE DDC_CLK_IN 001aag040 (1) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 TMDS_BIAS V CC(5V0) SLEW RATE ACCELERATOR DDC_DAT_OUT 001aag041 b. DDC data (1) ENABLE DDC_DAT_IN 5 ...

Page 14

... NXP Semiconductors 10.3 Hot plug driver circuit The IP4778CZ38 includes a hot plug driver circuit that simplifies the hot plug application. The circuit can be connected directly to GPIO pins. The hot plug control input is actively pulled LOW to ensure that at system standby or start-up, the hot plug signal is HIGH even if a GPIO pin 3-state condition. ...

Page 15

... IP4778CZ38 Product data sheet HDMI ESD protection, DDC buffering and hot plug control TMDS_BIAS CEC_OUT LIMITER (1) All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 V CC(3V3) CEC_IN SLEW RATE 001aag044 (1) 001aag045 © NXP B.V. 2011. All rights reserved. ...

Page 16

... Fig 12. Example of multiplexing both DDC and hot plug The combination of a TMDS switch and the IP4778CZ38 is a cost-effective way to attain various HDMI ports by using a single input HDMI receiver device. The ENABLE signal activates the HDMI DDC and hot plug lines at the port that is selected by the system controller ...

Page 17

... The HDMI contains various signals which can partly supply current into an HDMI device that is powered down. Typically, the DDC lines and the CEC signals can force 5 V into the switched-off device. The IP4778CZ38 ensures that at power-down, the critical signals are blocked to prevent any damage to the HDMI sink and HDMI source. Fig 13. Backdrive protection ...

Page 18

... TMDS_D0+ TMDS_D0− TMDS_CLK+ TMDS_CLK− CEC_IN DDC_CLK_IN DDC_DAT_IN HOT_PLUG_DET_IN Fig 14. Schematic of IP4778CZ38 application IP4778CZ38 Product data sheet HDMI ESD protection, DDC buffering and hot plug control shows a typical application where the IP4778CZ38 provides a simplified V V CC(5V0) 100 1.5 1.5 kΩ kΩ kΩ ...

Page 19

... R clock R CEC R CEC R data R clock 1.5 kΩ 100 kΩ 27 kΩ 47 kΩ 47 kΩ +5.0 V All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 V stand by CC(3V3) 1 TMDS_D2+ TMDS_GND TMDS_D2− TMDS_D1+ TMDS_GND TMDS_D1− TMDS_D0+ TMDS_GND TMDS_D0− ...

Page 20

... Z term R = load resistance load capacitance. L Test data R L 1.35 kΩ 27 kΩ All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 V V CC(5V0 DUT C L 001aah468 of the pulse generator ...

Page 21

... 2.5 scale (1) ( 0.27 0.20 9.8 4.5 0.5 6.4 0.17 0.09 9.6 4.3 REFERENCES JEDEC JEITA MO-153 All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 detail 0.7 0.49 1 0.2 0.08 0.08 0.5 0.21 EUROPEAN PROJECTION SOT510-1 X ...

Page 22

... Solder bath specifications, including temperature and impurities IP4778CZ38 Product data sheet HDMI ESD protection, DDC buffering and hot plug control All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 © NXP B.V. 2011. All rights reserved ...

Page 23

... Package reflow temperature (°C) 3 Volume (mm ) < 350 260 260 250 Figure 18. All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Figure 18) than a SnPb process, thus ≥ 350 220 220 350 to 2000 > 2000 260 260 250 245 245 245 © ...

Page 24

... General Purpose Input/Output High-Definition Multimedia Interface Metal Oxide Semiconductor Field Effect Transistor Restriction of Hazardous Substances Transition Minimized Differential Signaling All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 peak temperature time 001aac844 © NXP B.V. 2011. All rights reserved ...

Page 25

... Product data sheet Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 Change notice Supersedes - IP4778CZ38 v.2 - IP4778CZ38 v © NXP B.V. 2011. All rights reserved ...

Page 26

... Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from national authorities. All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 © NXP B.V. 2011. All rights reserved ...

Page 27

... Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. http://www.nxp.com salesaddresses@nxp.com All information provided in this document is subject to legal disclaimers. Rev. 3 — 31 March 2011 IP4778CZ38 © NXP B.V. 2011. All rights reserved ...

Page 28

... Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. © NXP B.V. 2011. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com IP4778CZ38 All rights reserved. Date of release: 31 March 2011 Document identifier: IP4778CZ38 ...

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