IP4786CZ32S datasheet(21/36 Pages) NEXPERIA

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IP4786CZ32S

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Product data sheet

Rev. 3 — 7 January 2015

20 of 35

NXP Semiconductors

IP4786CZ32S

DVI and HDMI interface ESD and overcurrent protection

11.2 Operating and standby modes

The operating mode of IP4786CZ32S depends on the availability of the VCC(5V0) and

VCC(SYS) supply voltages and on the state of the CEC_STBY input signal. Without

availability of both supplies, IP4786CZ32S is in Standby mode. As soon as VCC(5V0) and

VCC(SYS) are within the range specified in Section 8, the part is in an operating mode that

can be controlled via the CEC_STBY input signal. In case CEC_STBY is LOW, only the

CEC buffer is active and enabled to receive or send CEC commands. All other outputs are

in a high-ohmic state. A HIGH input signal enables all parts of IP4786CZ32S and puts the

device into full operating mode.

[1]

X = Don’t care (either LOW or HIGH level); L = LOW-level input; H = HIGH-level input

If no CEC Standby mode is required, or if no special Power-down modes are desired, the

CEC_STBY pin can be pulled HIGH to VCC(5V0) or VCC(SYS) for continuous HDMI and CEC

operation as soon as the supplies are available.

Strapping the CEC_STBY = VCC(SYS) =VDD of the ASIC guarantees that all interface

signals ending with the suffix “_SYS” on the system side are disabled when VCC(SYS) goes

LOW. This configuration protects the ASIC I/O signals from exceeding its local VDD. In this

mode, even if VCC(5V0) is powered, HDMI_5V0_CON goes active and hot plug events can

be detected only when the ASIC power supply rail is on.

Strapping CEC_STBY = VCC(5V0) is the most basic configuration where the buffers are

enabled whenever the local VCC(5V0) and VCC(SYS) supplies reach minimum operating

levels.

Table 11.

IP4786CZ32S operating modes

VCC(SYS)

VCC(5V0)

CEC_STBY[1]

Mode

Description

< 1.1 V

< 4.5 V

Standby mode

all outputs high-ohmic

 1.1 V

 4.5 V

CEC Standby mode

CEC circuit active;

all other outputs high-ohmic

full operating mode

all functional blocks active

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