參數(shù)資料
型號(hào)： LM79CCVF
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 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> 481K
代理商： LM79CCVF
AC Electrical Characteristics
(Note 13) The following specifications apply for +4.25 V
DC
≤
V
CC
≤
+5.75 V
DC
unless otherwise specified.
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
;
all other limits T
A
= T
J
=
25C. (Continued)
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.
DS100036-7
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
Pin Name
FAN1–FAN3
SCL
SDA
RESET
VID4/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
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