Ver: 2.7

Dec 26, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

3

G751

Global Mixed-mode Technology Inc.

Logic Electrical Characteristics

Digital DC Characteristics

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

LIMITS

UNITS

Logical “1” Input Voltage

+Vs× 0.7

+Vs + 0.5

V (min)

V (max)

Logical “0” Input Voltage

-0.3

+Vs×0.3

V (min)

V (max)

Logical “1” Intput Current

0.005

1.0

µA

Logical “0” Intput Current

-0.005

-1.0

µA

All Digital Inputs

20

pF

High Level Output Current

100

µA (max)

Low Level Output Voltage

0.4

V (max)

Output Fall Time

250

ns (max)

SMBus Digital Switching Characteristics

unless otherwise noted.

The switching characteristics of the G751 fully meet or exceed the published specifications of the SMBus. The fol-

lowing parameters are the timing relationships between SMBCLK and SMBDATA signals related to the G751.

They are not the SMBus specifications.

SYMBOL

PARAMETER

CONDITIONS TYPICAL

LIMITS

UNITS

SMBCLK (Clock) Period

2.5

µs (min)

Data in Set-Up Time to SMBCLK High

100

ns (min)

Data Out Stable after SMBCLK Low

0

ns (min)

SMBDATA Low Set-Up Time to SMBCLK Low (Start Condition)

100

ns (min)

SMBDATA High Hold Time after SMBCLK High (Stop Condition)

100

ns (min)

Pin Description

PIN

LABEL

FUNCTION

TYPICAL CONNECTION

1

SMBDATA

SMBus Serial Bi-Directional Data Line

From Controller

2

SMBCLK

SMBus Clock Input

From Controller

3

O.S.

Overtemperature Shutdown Open Drain Output

Pull Up Resistor, Controller Interrupt Line

4

GND

Power Supply Ground

Ground

5,6,7

A0-A2

User-Set SMBus Address Inputs

Ground (Low, “0”) or +Vs (High, “1”)

8

+Vs

Positive Supply Voltage Input

DC Voltage from 3V to 5.5V

Thermal Pad

Recommend connecting the Thermal Pad to the

GND or let it keep floating.

SMBCLK

SMBDATA

Data in

SMBDATA

Data out

t

1

t

4

t

2

t

5

t

3

SMBCLK

SMBDATA

Data in

SMBDATA

Data out

t

1

t

4

t

2

t

5

t

3