The MAX4929E low-frequency 2:1 switch is ideal for
HDMI™/DVI™ switching applications. The device features a voltage clamp function to protect low-voltage
systems at the output. The MAX4929E operates with a
single 5V supply or dual or triple supplies. The
MAX4929E provides clamping and voltage translation
without additional components. All external inputs/outputs are electrostatic-discharge (ESD)-protected to
±6kV Human Body Model (HBM).
The MAX4929E is available in 20-pin QSOP and 20-pin,
4mm x 4mm, TQFN packages. The device is specified
for the extended -40°C to +85°C operating temperature
range.
Applications
HD Television Receivers
HD Monitors
High-Resolution Computer Monitors
Features
o DDC Switches
Low 20pF (typ) Capacitance
o Protects EDID (Extended Display Identification
Data) EPROM or MCU from Excess Voltage
o Hot-Plug Detect Signal
Translates MCU Voltage to TTL Levels
o Two Devices Can Be Used to Form a 4:1 Switch
No Added Active Components Needed
o ±6kV ESD Protection HBM on All External I/Os
o Available in Lead-Free, 20-Pin TQFN or 20-Pin QSOP
, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND, unless otherwise noted.)
V+ ............................................................................-0.3V to +6V
All Pins (except GND) .............................................-0.3V to +6V
Continuous Current into Any I/O Terminal .........................25mA
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN SDAO/SCLO AND "OFF" SDA_/SCL_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN SDAO/SCLO AND "ON" SDA_/SCL_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
*FOR CROSSTALK THIS PIN IS SCL2.
SCL1 AND SCL0 ARE OPEN.
119HPDO2Hot-Plug Detect Output 2. Translate logic level of HPD to V+ compatible (See Table 2).
220HPIR2Hot-Plug Interrupt Request 2
31SDA2Serial Data Input. SDA Mux Input 2.
42SCL2Serial Clock Input. SCL Mux Input 2.
53HPDO1Hot-Plug Detect Output 1. Translate logic level of HPD to V+ compatible (See Table 2).
64HPIR1Hot-Plug Interrupt Request 1
75SDA1Serial Data Input. SDA Mux Input 1.
86SCL1Serial Clock Input. SCL Mux Input 1.
97V+Positive Supply Voltage. Bypass V+ to GND with a 0.1µF or greater ceramic capacitor.
108CLP
119VL
1210SELSelect Input. Logic input for Mux connection (See Table 1).
1311SCLOSCL Mux Output. Connect SCLO to EDID EPROM.
1412SDAOSDA Mux Output. Connect SDAO to EDID EPROM.
1513HPIRO
1614HPDHot-Plug Detect Input. Logic level on HPD is compatible with MCU.
1715HIZ2Enable Input 2 (See Table 4).
1816HIZ1Enable Input 1 (See Table 4).
1917GNDGround
2018EXESDExternal ESD Discharge. Connect 0.1µF capacitor from EXESD to GND.
—EPEPExposed Paddle. Connect EP to GND or leave EP unconnected.
NAMEFUNCTION
Clamp-Voltage Reference. Clamp the maximum voltage of SCLO and SDAO. Bypass
CLP to GND with a 0.1µF or greater ceramic capacitor (See Figure 6 and the Typical
Operating Circuit).
Logic Supply for HIZ_, SEL, HPD, HPIRO. Bypass VL to GND with a 0.1µF or greater
ceramic capacitor. VL should have the same voltage level as any MCU interface.
Hot-Plug Interrupt Request Output. Translate logic level of HPIR_ to VL compatible
(See Table 3).
The MAX4929E low-frequency 2:1 switch is ideal for the
low-frequency portion of HDMI/DVI switching applications. The device features three independent voltage
inputs that allow the user to match any voltage level
encountered in switching without additional components. The V+ range is from 4.5V to 5.5V to match the
HDMI/DVI 5V requirements. CLP is set to match the
EDID EPROM from 3.3V to 5.5V. VL is connected to the
same supply as the system MCU. All pins going to the
HDMI/DVI connectors are ESD-protected to ±6kV
Human Body Model (HBM).
The MAX4929E has two enable inputs. The enable
function allows the device to operate in normal mode or
go into a high-Z state. It is possible to control two
MAX4929Es with a single control bit, creating a 4:1
equivalent switch using a minimum of external components (see Figure 6).
Supply or signals sequencing are not required for the
MAX4929E. Supply voltages V+, VL, and CLP can be
applied in any order. Signals can be applied in any
order as well.
Analog Switch
The MAX4929E features a voltage clamp function for the
two 2:1 switch. Inputs to SCL_/SDA_ are V+ level compatible. Maximum output voltages of SCLO/SDAO are
clamped to CLP. For optimum performance connect the
EDID EPROM supply voltage to CLP (see Figure 6). For
proper operation of the voltage clamp, connect
SCLO/SDAO to CLP through the pullup resistors. For
maximum output range, connect CLP to V+. The output of
the switch is connected to the EDID EPROM, voltages
from 3V to 5.5V are expected.
Logic Inputs
VL is the supply to input logic HIZ_, SEL, and HPD.
Connect VL to the same supply as the system MCU for
compatibility.
V+ is the supply to the input logic of the HPIR1 and
HPIR2 inputs.
The HPDO_ signals are 5V TTL-compatible, per HDMI/
DVI specifications. HPIRO is VL compatible.
ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against ESD
encountered during handling and assembly.
Additionally, the MAX4929E is protected to ±6kV (HBM)
on SCL1, SCL2, SDA1, SDA2, HPDO1, HPDO2, HPIR1,
and HPIR2 by the HBM.
Human Body Model
Several ESD testing standards exist for measuring the
robustness against ESD events. The ESD protection of
the MAX4929E is characterized with the HBM method.
Figure 4 shows the model used to simulate an ESD event
resulting from contact with the human body. The model
consists of a 100pF storage capacitor that is charged to a
high voltage, then discharged through a 1.5kΩ resistor.
Figure 5 shows the current waveform when the storage
capacitor is discharged into a lower impedance.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report documenting test
setup, methodology, and results.
There is no power-supply sequencing required. Power
can be applied to V+, CLP, or VL in any order. Bypass
V+, VL, and CLP to GND using 0.1µF or larger ceramic
capacitors as close to the device as possible.
Hot Plug
The MAX4929E is designed for HDMI/DVI switching.
The MAX4929E permits hot-plugging to any inputs/
outputs regardless of the power status of the device.
A plug can be inserted, and thus connected to the
MAX4929E whether the device is powered up or not.
Therefore, sequencing of power supplies is not
required; V+, CLP, and VL can be applied in any order.
Configure Two Devices to Form 4:1 Switch
Two MAX4929Es can be connected together to form a
4:1 switch (see Figure 6).
Exposed Paddle
The MAX4929EETP+ provides an EP to improve thermal
performance in the TQFN package. Connect the EP to
GND or leave EP unconnected.
Figure 6. Two MAX4929Es Connected to Form a 4:1 Translating Switch
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
MAX4929E
HDMI 2:1 Low-Frequency Translating Switch
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
QSOP.EPS
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