MAX4895EETE+T Maxim Integrated Products, MAX4895EETE+T Datasheet - Page 6

• Manufacturer Part Number: MAX4895EETE+T
• Description: IC PORT PROTECTOR VGA 16TQFN
• Manufacturer: Maxim Integrated Products
• Type: VGA Port Protectorr

Specifications of MAX4895EETE+T

• Applications: Desktop, Notebook PCs
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX4895EETE+T; MAX4895EETE+TTR

VGA Port Protector
The MAX4895E integrates level-translating buffers and
features R, G, B port protection for VGA signals.
Horizontal and vertical synchronization (H0/V0) inputs
feature level-shifting buffers to support low-voltage
CMOS or standard TTL-compatible graphics con-
trollers. The device meets ±10mA VESA drive require-
ments. The MAX4895E also features I
using two nMOS devices. All outputs maintain ±15kV
Human Body Model (HBM) and ±8kV Contact
Discharge per IEC 61000-4-2 on seven terminals
(SDA1, SCL1, H1, V1, R, G, B). The R, G, B pads pro-
tect the digital-to-analog converter (DAC) and are sim-
ply placed in parallel with the R, G, B outputs for the
DAC and VGA socket.
HSYNC/VSYNC are buffered to provide level shifting
and drive capability to meet the VESA specification.
Input logic levels (V
the Electrical Characteristics table). The level-shifted
outputs (H1 and V1) are pulled low when EN is driven
low (see Table 1). Logic-level output (V
+5.0V TTL compatible.
Table 1. HV Truth Table
Table 2. DDC Truth Table
6
EN
EN
_______________________________________________________________________________________
1
0
1
0
Horizontal/Vertical Sync Level Shifter
HSYNC/VSYNC level shifting enabled
SDA1, SCL1, high impedance
IL
Detailed Description
, V
IH
SDA0 to SDA1
SCL0 to SCL1
) are connected to V
FUNCTION
FUNCTION
H1, V1 = 0
2
C level shifting
OL
, V
OH
L
) are
(see
The MAX4895E incorporates two nMOS switches for I
level shifting. The SDA, SCL terminals are voltage
clamped to a diode drop less than the V
Voltage clamping provides protection and compatibility
with SDA, SCL signals and low-voltage ASICs. Supply
+2.5V to +3.3V on V
VESA I
are identical, and each switch can be used to route
SDA or SCL signals.
There are three terminals for R, G, and B. The only
function of these terminals is to provide high-level ESD
protection to the RGB lines, while at the same time,
keeping the capacitance on the RGB lines to a mini-
mum. The R, G, B terminals are identical, and any of
the three terminals can be used to protect red, green,
or blue video signals.
As with all Maxim devices, ESD-protection structures
are incorporated on all terminals to protect against
electrostatic discharges encountered during handling
and assembly. Additionally, the MAX4895E is protected
to ±15kV on the RGB terminals and outputs H1, V1,
SDA1, and SCL1 by the Human Body Model (HBM). For
optimum ESD performance, bypass V
a 1µF ceramic capacitor.
ESD protection can be tested in various ways. The R,
G, B terminals and outputs H1, V1, SDA1, and SCL1 of
the MAX4895E are characterized for protection to the
following limits:
• ±15kV using the Human Body Model
• ±8kV IEC 61000-4-2 Contact Discharge
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report documenting test
setup, methodology, and results.
2
C-compatible signals. The SDA, SCL switches
Display Data Channel Switches
L
to provide voltage clamping for
ESD Test Conditions
ESD Protection
CC
to ground with
L
voltage.
RGB
2
C