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G768B Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part No. G768B
Description  Remote/Local Temperature Sensor, 2 Fan Controllers with SMBus Serial Interface and System Reset Circuit
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Maker  ETC [List of Unclassifed Manufacturers]
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G768B Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

 
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Ver 1.3
Oct 28, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G768B
Global Mixed-mode Technology Inc.
Electrical Characteristics (continued)
(Vcc = + 5V, TA = 60°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP
MAX
UNITS
SMBus Interface
Logic Input High Voltage
SMBCLK, SMBDATA; Vcc = 4.5V to 5.5V
2.4
V
Logic Input Low Voltage
SMBCLK, SMBDATA; Vcc = 4.5V to 5.5V
0.8
V
Logic Output Low Sink Current
ALERT , SMBDATA forced to 0.4V
6
mA
ALERT Output High Leakage Current
ALERT forced to 5.5V
1
µA
Logic Input Current
Logic inputs forced to Vcc or GND
-2
2
µA
SMBus Input Capacitance
SMBCLK, SMBDATA
5
pF
SMBus Clock Frequency
(Note 4)
DC
100
kHz
SMBCLK Clock Low Time
tLOW , 10% to 10% points
4.7
µs
SMBCLK Clock High Time
tHIGH , 90% to 90% points
4
µs
SMBus Start-Condition Setup Time
4.7
µs
SMBus Repeated Start-Condition
Setup Time
tSU : STA , 90% to 90% points
500
ns
SMBus Start-Condition Hold Time
tHD: STA , 10% of SMBDATA to 90% of SMBCLK
4
µs
SMBus Start-Condition Setup Time
tSD: STO , 90% of SMBDATA to 10% of SMBDATA
4
µs
SMBus Data Valid to SMBCLK Ris-
ing-Edge Time
tSU: DAT , 10% or 90% of SMBDATA to 10% of
SMBCLK
800
ns
SMBus Data-Hold Time
tHD : DAT(Note 5)
0
µs
SMBCLK Falling Edge to SMBus
Data-Valid Time
Master clocking in data
1
µs
Electrical Characteristics (continued)
(VCC =full range, TA= 60°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Reset Threshold
VTH
4.2
4.4
4.5
V
Reset Active Timeout Period
340
ms
RESET
Output Voltage Low
VOL
VCC=VTH min ISINK =3.2mA
0.4
V
RESET
Output Voltage High
VOH
VCC>VTH max
ISOURCE =5.0mA
VCC-1.5
V
Note 1: Guaranteed but not 100% tested.
Note 2: Quantization error is not included in specifications for temperature accuracy. For example, if the G768B
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.


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