LM79 NSC [National Semiconductor], LM79 Datasheet - Page 10

• Manufacturer Part Number: LM79
• Description: Microprocessor System Hardware Monitor
• Manufacturer: NSC [National Semiconductor]

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AC Electrical Characteristics
+5.75 V
25˚C. (Continued)
An x indicates that the diode exists.
Note 8: Typicals are at T
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
to 1.4V.
IORD
IOWR
SYSCLK
D0–D7
SMI__IN
Chassis Intrusion
Power Switch
Bypass
−IN6
FB6
FB5
−IN5
IN4–IN0
VID3–VID0
Pin Name
Pin Name
DC
unless otherwise specified. Boldface limits apply for T
D1
x
x
x
x
J
=T
A
D1
x
=25˚C and represent most likely parametric norm.
D2
x
x
x
x
x
x
D2
x
x
x
D3
x
x
x
x
x
x
D3
x
x
x
x
x
x
x
FIGURE 4. ESD Protection Input Structure
(Note 13) The following specifications apply for +4.25 V
IL
=0.4V for a falling edge and V
10
A
FAN1–FAN3
SCL
SDA
RESET
VID4/NTEST
BTI
NMI/IRQ
SMI
A0–A2
CS
Pin Name
= T
J
Pin Name
= T
DS100036-7
MIN
IH
=2.4V for a rising edge. TRI-STATE output voltage is forced
to T
D1
x
x
MAX
; all other limits T
D1
x
D2
x
x
D2
x
x
x
D3
x
x
x
x
x
D3
x
x
x
x
x
DC
A
= T
V
CC
J
=