PTN3300A Datasheet, PDF (10/23 Pages) NXP Semiconductors – DVI/HDMI level shifter with inverting 1.1 V HPD

NXP Semiconductors
PTN3300A
DVI/HDMI level shifter with inverting 1.1 V HPD
6.1.2 Output Enable function (OE_N)
When input OE_N is asserted (active LOW), the IN_Dx and OUT_Dx signals are fully
functional provided that HPD_SINK input is HIGH. Input termination resistors are enabled
and the internal bias circuits are turned on.
When OE_N is de-asserted (inactive HIGH), the OUT_Dx outputs are in a
high-impedance state and drive zero output current. The IN_Dx input buffers are disabled
and IN_Dx termination is disabled. Internal bias circuits for the differential inputs and
outputs are turned off. Power consumption is minimized.
Remark: Note that OE_N has no influence on the HPD_SINK input, HPD_SOURCE_N
output, or the SCL and SDA level shifters. OE_N only affects the high-speed TMDS
channel.
6.1.3 DDC channel enable function (DDC_EN)
The DDC_EN pin is active HIGH and can be used to isolate a badly behaved slave. When
DDC_EN is LOW, the DDC channel is turned off. The DDC_EN input should never change
state during an I²C-bus operation. Note that disabling DDC_EN during a bus operation will
hang the bus, while enabling DDC_EN during bus traffic would corrupt the I²C-bus
operation. Hence, DDC_EN should only be toggled while the bus is idle. (See I²C-bus
specification).
6.1.4 Enable/disable truth table
Table 3. HPD_SINK, OE_N and DDC_EN enabling and power saving functions truth table
Inputs
Channels
Mode
HPD_SINK OE_N DDC_EN IN_Dx
[1]
[2]
[3]
OUT_Dx^[4]
DDC^[5]
HPD_SOURCE_N
[6]
LOW
HIGH
HIGH
HIGH
HIGH
X
X
LOW LOW
LOW HIGH
HIGH LOW
HIGH HIGH
high-impedance
50 Ω termination
to V_RX(bias)
50 Ω termination
to V_RX(bias)
high-impedance
high-impedance
high-impedance; high-impedance
zero output
current
enabled
high-impedance
enabled
enabled
high-impedance; high-impedance
zero output
current
high-impedance; enabled
zero output
current
HIGH
LOW
LOW
LOW
LOW
Standby
Active
Active
Standby
Standby
with DDC
channel
enabled
[1] A LOW level on input HPD_SINK disables both the TMDS and DDC channels.
[2] A HIGH level on input OE_N disables only the TMDS channels.
[3] A LOW level on input DDC_EN disables only the DDC channel.
[4] OUT_Dx channels ‘enabled’ means outputs OUT_Dx toggling in accordance with IN_Dx differential input voltage switching.
[5] DDC channel ‘enabled’ means SDA_SINK is connected to SDA_SOURCE and SCL_SINK is connected to SCL_SOURCE.
[6] The HPD_SOURCE_N output logic state follows the inverse of the HPD_SINK input logic state regardless of Active or Standby mode.
PTN3300A_1
Product data sheet
Rev. 01 — 30 June 2008
© NXP B.V. 2008. All rights reserved.
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