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MAX14895E Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer MAX14895E
Beschreibung Enhanced VGA Port Protector
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 11 Seiten
MAX14895E Datasheet, Funktion
19-5819; Rev 0; 3/11
EVALUATION KIT AVAILABLE
MAX14895E
Enhanced VGA Port Protector
General Description
The MAX14895E integrates level-translating buffers and
features RED, GRN, and BLU (RGB) port protection for
VGA signals.
The device has horizontal sync (SYNCH_) and vertical
sync (SYNCV_) translating buffers that convert low-level
CMOS inputs from a graphics controller to meet full 5V,
TTL-compatible outputs. Each output can drive Q10mA
and meets the VESASM specification. In addition, the
device translates the direct digital control (DDC) signals
to a lower level that is safe for the graphics controller.
The device features both EN and EN inputs, accepting
active-high or active-low enable inputs. The device also
switches and current limits the 5V supply to a VGA con-
nector or monitor.
The RED, GRN, and BLU terminals protect graphics con-
troller outputs against electrostatic discharge (ESD) events.
All eight outputs and EN have high-level ESD protection.
The MAX14895E is specified over the extended -40NC to
+85NC temperature range and is available in a 16-pin,
3mm x 3mm TQFN package with exposed pad.
Notebook Computers
Desktops
Applications
Servers
Graphics Cards
Benefits and Features
S Saves Power in Portable Applications
Low Quiescent Supply Current: 430µA (typ)
S Eliminates Need for Costly External Components
High-ESD Protection on SDA1, SCL1, SYNCH1,
SYNCV1, RED, GRN, BLU, EN, VS
±15kV Human Body Model (HBM)
±8kV IEC 61000-4-2 Contact Discharge
S Innovative Design Enables a High Level of
Integration for Performance
Output Current-Limit Switch with Power-Off
Protection
Low Capacitance on RGB Ports (2.2pF typ)
±10mA Drive on SYNCH1, SYNCV1
S Fully Integrated Solutions Saves Space in Portable
Applications
DDC Outputs have Internal Pullups
3mm x 3mm, 16-Pin TQFN Package
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX14895E.related.
Typical Operating Circuit
VGA
OUTPUTS
2
2
+5V
1µF
EN VCC VS
EN
SYNCH0, SYNCV0 SYNCH1, SYNCV1
SDA0, SCL0
SDA1, SCL1
RED
GRN MAX14895E
BLU
GND
1µF
2
2
VGA
PORT
VESA is a service mark of the Video Electronics Standards Association Corporation.
����������������������������������������������������������������� Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
http://www.Datasheet4U.com






MAX14895E Datasheet, Funktion
MAX14895E
Enhanced VGA Port Protector
Pin Configuration
TOP VIEW
12 11 10 9
SYNCV0 13
SYNCV1 14
VCC 15
EN 16 +
1
MAX14895E
*EP
234
8 SDA1
7 SDA0
6 EN
5 VS
*CONNECT EP TO GND.
TQFN
(3mm x 3mm)
Pin Description
PIN NAME
FUNCTION
1 RED High-ESD Protection Diodes for RGB Signals
2 GRN High-ESD Protection Diodes for RGB Signals
3 BLU High-ESD Protection Diodes for RGB Signals
4 GND Ground
5
VS
Supply Voltage Output with Current-Limit Switch. VS provides a current-limited voltage from VCC when the
device is enabled. Bypass VS to GND with a 1FF or larger ceramic capacitor as close as possible to the device.
6 EN Active-Low Enable Input. Drive EN high and EN low to disable the device. EN is weakly pulled up internally.
7 SDA0 DDC Data Input from Graphics Controller
8 SDA1 DDC Data Output to VGA Monitor. Internally pulled up to VCC.
9 SCL0 DDC Clock Input from Graphics Controller
10 SCL1 DDC Clock Output to VGA Monitor. Internally pulled up to VCC.
11 SYNCH0 Horizontal Sync Input
12 SYNCH1 Horizontal Sync Output
13 SYNCV0 Vertical Sync Input
14 SYNCV1 Vertical Sync Output
15
VCC
Supply Voltage Input. Apply a voltage between +4.75V and +5.25V to VCC to power the device. Bypass VCC
to GND with a 1FF or larger ceramic capacitor as close as possible to the device.
16 EN Active-High Enable Input. Drive EN low and EN high to disable the device. EN is weakly pulled down internally.
EP
Exposed Pad. Connect EP to GND. For enhanced thermal dissipation, connect EP to a large ground plane.
Do not use EP as the only ground connection.
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