LM79 datasheet(10/31 Pages) NSC

10 / 31 page

AC Electrical Characteristics (Note 13) The following specifications apply for +4.25 V

DC ≤ VCC ≤

+5.75 VDC unless otherwise specified. Boldface limits apply for TA =TJ =TMIN to TMAX; all other limits TA =TJ =

25˚C. (Continued)

Note 8: Typicals are at TJ=TA=25˚C 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, VIL=0.4V for a falling edge and VIH=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

xxx

SMI__IN

Chassis Intrusion

Power Switch

Bypass

Pin Name

FAN1–FAN3

SCL

SDA

RESET

VID4/NTEST

Pin Name

−IN6

FB6

FB5

−IN5

IN4–IN0

VID3–VID0

Pin Name

BTI

NMI/IRQ

xxx

SMI

A0–A2

FIGURE 4. ESD Protection Input Structure

LM79 Datasheet(PDF) 10 Page - National Semiconductor (TI)

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