Rainbow Electronics MAX4895E User Manual

General Description

The MAX4895E integrates level-translating buffers and
features R, G, B port protection for VGA signals.

The MAX4895E has H, V (horizontal, vertical) translat­ing buffers that take low-level CMOS inputs from the
graphics outputs to meet full +5.0V, TTL-compatible
outputs. Each output can drive ±10mA and meet the
VESA®specification. In addition, the device takes the
+5.0V, direct digital control (DDC) signals and trans­lates them to the lower level required by the graphics
device. This level is set by the user by connecting V

L

to
the graphics output supply. The R, G, B terminals pro­tect the graphics output pins against electrostatic dis­charge (ESD) events. All seven outputs have high-level
ESD protection.

The MAX4895E is specified over the extended -40°C to
+85°C temperature range, and is available in a 16-pin,
3mm x 3mm TQFN package.

Applications

Notebook Computers

Desktops

Servers

Graphics Cards

Features

♦ ESD Protection on H1, V1, SDA1, SCL1, R, G, and B

±15kV—Human Body Model

±8kV—IEC 61000-4-2, Contact Discharge

♦ Low Quiescent Current, IQ≤ 5µA (max)

♦ Low 3pF (max) Capacitance (R, G, B Ports)

♦ DDC Level-Shifting Protection and Isolation

♦ Horizontal Sync, Vertical Sync Level Shifting/

Buffering

♦ Input Compatible with V

L

♦ Output Full +5.0V TTL Compatible (per VESA)

♦ ±10mA Drive on Each H, V Terminal

♦ Space-Saving, Lead-Free, 16-Pin (3mm x 3mm)

TQFN Package

MAX4895E

VGA Port Protector

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration

Ordering Information

Typical Operating Circuit

19-4569; Rev 0; 4/09

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.

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4895EETE+ -40°C to +85°C 16 TQFN-EP* AHEEAA

+

Denotes a lead(Pb)-free/RoHS-compliant package.

*

EP = Exposed pad.

VESA is a registered trademark of Video Electronics Standards
Association Corporation.

L

MAX4895E

GND

1μF

+5V

V

CC

H1, V1

SDA1, SCL1

N.C.

1μF

2

2

+3.3V

V

VGA OUTPUTS VGA PORT

EN

2

H0, V0

2

SDA0, SCL0

R

G

B

TOP VIEW

H1

12 10 9

13

V0

14

V1

15

V

CC

16

EN

+

13

R

(3mm × 3mm)

*CONNECT EXPOSED PAD TO GND.

MAX4895E

SCL1

SCL0

11

8

7

6

*EP

5

2

GH0

4

B

GND

TQFN

SDA1

SDA0

N.C.

V

L

MAX4895E

VGA Port Protector

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +4.5V to +5.5V, VL= +2.0V to VCC, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5.0V,

V

L

= +3.3V, and TA= +25°C.) (Note 2)

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.

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial

.

(All voltages referenced to GND.)
V

CC

........................................................................-0.3V to +6.0V

V

L

.............................................................-0.3V to +(VCC+ 0.3V)

R, G, B, H1, V1, SCL1, SDA1...................-0.3V to +(V

CC

+ 0.3V)

EN, H0, V0, SCL0, SDA0 ............................-0.3V to +(V

L

+ 0.3V)

Continuous Current through SDA_, SCL_.........................±30mA

Continuous Short-Circuit Current H1, V1..........................±20mA

Continuous Power Dissipation (T

A

= +70°C) for multilayer

board:

16-Pin TQFN (derate 20.8mW/°C above +70°C) .......1667mW

Junction-to-Case Thermal Resistance (θ

JC

) (Note 1) ......7°C/W

Junction-to-Ambient Thermal Resistance (θ

JA

)

(Note 1) ........................................................................48°C/W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SUPPLY OPERATION

Supply Voltage VCC 4.5 5.5 V

Logic Supply Voltage VL VL VCC 2 3.3 5.5 V

VCC Supply C urrent ICC VH0, VV0 = 0, VEN = VL 0.5 5.0 μA

VL Supply C urrent IL VH0, VV0 = 0, VEN = VL (no load) 0.5 5.0 μA

RGB CHANNELS

R, G, B Capacitance C

f = 1MHz, V

OUT

R, G, B Leakage VCC = +5.5V -1 +1 μA

H_, V_, EN CHANNELS

Input Threshold Low VIL VL = +3.0V 0.8 V

Input Threshold High VIH VL = +3.6V 2.0 V

Input Hystere sis V

Input Leakage Current I

Output-Voltage Low VOL I

Output-Voltage High VOH I

Propagat ion Delay t

Enable Time tON, t

100 mV

HYST

VL = +3.3V, VCC = +5.5V -1 +1 μA

LEAK

OUT

OUT

PD

RL = 2.2k, CL = 10pF, VOL = +0.8V,
V

15 ns

OFF

SDA_, SCL_ (DDC) CHANNELS

On-Resistance, SDA, SCL R

Leakage Current, SDA, SCL I

ON

LEAK

VCC = +5.5V, I
V

VL = 0 -1 +1 μA

R,G,B

= 1V

(Note 3) 2.2 pF

P-P

= 10mA sink, VCC = +4.5V 0.8 V

= 10mA source, VCC = +4.5V 2.4 V

= +2.4V

OH

= ±10mA,

SDA, SCL

SDA SCL

= +0.5V

15 ns

20 55 

MAX4895E

VGA Port Protector

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +4.5V to +5.5V, VL= +2.0V to VCC, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5.0V,

V

L

= +3.3V, and TA= +25°C.) (Note 2)

Note 2: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 3: Guaranteed by design, not production tested.
Note 4: Tested terminals to GND; 1µF bypass capacitors on V

CC

and VL.

Typical Operating Characteristics

(VCC= +5.0V, VL= +3.3V, and TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ESD PROTECTION

SDA1, SCL1, H1, V1, R, G, B Human Body Model (Note 4) ±15 kV

SDA1, SCL1, H1, V1, R, G, B IEC 61000-4-2 Contact ±8 kV

60

RON vs. V

SDA0, SCL0 ARE
INTERCHANGEABLE

45

VCL = +3.3V

(Ω)

30

ON

TA = +85°C

R

TA = +25°C

TA = -40°C

15

0

0 4.5

SDA0

TA = -40°C

2.01.51.0 3.02.5 4.00.5 3.5

V

(V)

SDA0

VCL = +5V

TA = +85°C

TA = +25°C

MAX4895E toc01

OUTPUT VOLTAGE (V)

HV BUFFER OUTPUT-VOLTAGE

HIGH vs. TEMPERATURE

6.0

5.5

5.0

4.5

4.0

-40 85

10-15 35 60

TEMPERATURE (°C)

I

= 8mA

OUT

MAX4895E toc02

HV BUFFER OUTPUT-VOLTAGE

LOW vs. TEMPERATURE

1.0

0.8

0.6

0.4

OUTPUT VOLTAGE (V)

0.2

0

-40 85

10-15 35 60

TEMPERATURE (°C)

I

= 8mA

OUT

MAX4895E toc03