參數(shù)資料
型號(hào)： LM78CCVF-J
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： Microprocessor System Hardware Monitor
中文描述： SPECIALTY ANALOG CIRCUIT, PQFP44
封裝： 10 X 10 MM, PLASTIC, QFP-44
文件頁(yè)數(shù)： 10/31頁(yè)
文件大?。?/td> 424K
代理商： LM78CCVF-J
Electrical Characteristics (Continued)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2:
All voltages are measured with respect to GND, unless otherwise specified
Note 3:
When the input voltage (V
IN
) at any pin exceeds the power supplies (V
IN
<
(GNDD or GNDA) or V
IN
>
V
CC
), the current at that pin should be limited to 5 mA.
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 4:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
J
max,
θ
JA
and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
= (T
J
maxT
A
)/
θ
JA
.
Note 5:
The human body model is a 100 pF capacitor discharged through a 1.5 k
resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 6:
See the section titled “Surface Mount” found in any post 1986 National Semiconductor Linear Data Book for other methods of soldering surface mount
devices.
Note 7:
Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below, input voltage magnitude up to 0.3V above
V
or 0.3V below GND will not damage the LM78. There are parasitic diodes that exist between the inputs and the power supply rails. Errors in theADC conversion
can occur if these diodes are forward biased by more than 50 mV. As an example, if V
CC
is 4.50 V
DC
, input voltage must be
≤
4.55 V
DC
, to ensure accurate
conversions.
Note 8:
Typicals are at T
J
=T
A
=25C and represent most likely parametric norm.
Note 9:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10:
TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC and any error introduced by the amplifiers as shown in the circuit of
Figure 13 .
Note 11:
Total Monitoring Cycle Time includes temperature conversion, 7 analog input voltage conversions and 3 tachometer readings. Each temperature and input
voltage conversion takes 100 ms typical and 112 ms maximum. Fan tachometer readings take 20 ms typical, at 4400 rpm, and 200 ms max.
Note 12:
The total fan count is based on 2 pulses per revolution of the fan tachometer output.
Note 13:
Timing specifications are tested at the TTL logic levels, V
IL
=0.4V for a falling edge and V
IH
=2.4V for a rising edge. TRI-STATE output voltage is forced
to 1.4V.
DS012873-7
An x indicates that the diode exists.
Pin Name
IORD
IOWR
SYSCLK
D0–D7
SMI__IN
Chassis Intrusion
Power Switch
Bypass
D1
D2
D3
x
x
x
x
x
x
x
x
x
x
x
x
Pin Name
FAN1–FAN3
SCL
SDA
RESET
NTEST
D1
D2
D3
x
x
x
x
x
x
x
x
x
Pin Name
IN6
FB6
FB5
IN5
IN4–IN0
VID3–VID0
D1
D2
x
x
x
x
x
x
D3
x
x
x
x
x
x
x
x
x
x
Pin Name
BTI
NMI/IRQ
SMI
A0–A2
CS
D1
x
x
D2
D3
x
x
x
x
x
x
x
FIGURE 4. ESD Protection Input Structure
L
www.national.com
10
相關(guān)PDF資料
PDF描述
LM79CCVF Microprocessor System Hardware Monitor
LM79
LM81CIMTX-32 Serial Interface ACPI-Compatible Microprocessor System
LM81 Serial Interface ACPI-Compatible Microprocessor System
LM81CIMT-31 Serial Interface ACPI-Compatible Microprocessor System
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM78D05A 制造商:CYSTEKEC 制造商全稱:Cystech Electonics Corp. 功能描述:Three Terminal Positive Voltage Regulators
LM78D05AJ3 制造商:CYSTEKEC 制造商全稱:Cystech Electonics Corp. 功能描述:Three Terminal Positive Voltage Regulators
LM78D05B 制造商:CYSTEKEC 制造商全稱:Cystech Electonics Corp. 功能描述:Three Terminal Positive Voltage Regulators
LM78D05BJ3 制造商:CYSTEKEC 制造商全稱:Cystech Electonics Corp. 功能描述:Three Terminal Positive Voltage Regulators
LM78D05XJ3 制造商:CYSTEKEC 制造商全稱:Cystech Electonics Corp. 功能描述:Three Terminal Positive Voltage Regulators
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*