G768D Ver la hoja de datos (PDF) - Global Mixed-mode Technology Inc

Número de pieza

componentes Descripción

Fabricante

G768D

Two Remote Temperature Sensors and One Fan Controller with SMBus Serial Interface and System Reset Circuit

Global Mixed-mode Technology Inc 

Global Mixed-mode Technology Inc.

Electrical Characteristics (continued)

(VCC = + 5V, TA = 60°C, unless otherwise noted.)

PARAMETER

CONDITIONS

SMBus Interface

Logic Input High Voltage

Logic Input Low Voltage

Logic Output Low Sink Current

SMBCLK, SMBDATA; VCC = 4.5V to 5.5V

SMBCLK, SMBDATA; VCC = 4.5V to 5.5V

ALERT , SMBDATA forced to 0.4V

ALERT Output High Leakage Current ALERT forced to 5.5V

Logic Input Current

SMBus Input Capacitance

Logic inputs forced to VCC or GND

SMBCLK, SMBDATA

SMBus Clock Frequency

(Note 4)

SMBCLK Clock Low Time

SMBCLK Clock High Time

SMBus Start-Condition Setup Time

tLOW , 10% to 10% points

tHIGH , 90% to 90% points

SMBus Repeated Start-Condition

Setup Time

tSU : STA , 90% to 90% points

SMBus Start-Condition Hold Time

tHD: STA , 10% of SMBDATA to 90% of SMBCLK

SMBus Start-Condition Setup Time tSD: STO , 90% of SMBDATA to 10% of SMBDATA

SMBus Data Valid to SMBCLK Rising- tSU: DAT , 10% or 90% of SMBDATA to 10% of

Edge Time

SMBCLK

SMBus Data-Hold Time

SMBCLK Falling Edge to SMBus

tHD : DAT(Note 5)

Master clocking in data

Data-Valid Time

G768D

MIN TYP MAX UNITS

2.4

V

0.8

V

6

mA

1

µA

-2

2

µA

5

pF

DC

100 KHz

4.7

µs

4

µs

4.7

µs

500

ns

4

µs

4

µs

800

ns

0

µs

1

µs

Electrical Characteristics (continued)

(VCC =full range, TA= 60°C, unless otherwise noted.)

PARAMETER

Reset Threshold

Reset Active Timeout Period

RESET Output Voltage Low

RESET Output Voltage High

SYMBOL

VTH

CONDITIONS

VOL

VCC=VTH min, ISINK=3.2mA

VOH

VCC>VTH max, ISOURCE=5.0mA

MIN TYP

4.2 4.4

340

VCC-1.5

MAX

4.5

0.4

UNITS

V

ms

V

V

Note 1: Guaranteed but not 100% tested.

Note 2: Quantization error is not included in specifications for temperature accuracy. For example, if the G768D

device temperature is exactly +66.7°C, or +68°C (due to the quantization error plus the +1/2°C offset

used for rounding up) and still be within the guaranteed ±3°C error limits for the +60°C to +100°C tem-

perature range. See Table3.

Note 3: A remote diode is any diode-connected transistor from Table1. TR is the junction temperature of the re-

mote diode. See Remote Diode Selection for remote diode forward voltage requirements.

Note 4: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow op-

eration is possible, it violates the 10kHz minimum clock frequency and SMBus specifications, and may

monopolize the bus.

Note 5: Note that a transition must internally provide at least a hold time in order to bridge the undefined region

(300ns max) of SMBCLK's falling edge.

Ver: 1.2

Apr 03, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

4

Share Link: