LM81 datasheet(7/32 Pages) NSC

Part #	LM81

Description	Serial Interface ACPI-Compatible Microprocessor System

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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7 / 32 page

AC Electrical Characteristics

The following specifications apply for +2.8V

DC ≤ V

≤ +3.8V

DC on SMBCLK and SMBData, unless otherwise specified. Bold-

face limits apply for T

A = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. (Note 15)

Symbol

Parameter

Conditions

Typical

Limits

Units

(Note 9)

(Note 10)

(Limits)

SERIAL BUS TIMING CHARACTERISTICS

SMBCLK (Clock) Period

2.5

µs (min)

rise

SMBCLK and SMBData Rise Time

µs (max)

fall

SMBCLK and SMBData Fall Time

300

ns (max)

Data In Setup Time to SMBCLK High

100

ns (min)

Data Out Stable After SMBCLK Low

ns (min)

SMBData Low Setup Time to SMBCLK Low

(start)

100

ns (min)

SMBData High Hold Time After SMBCLK

High (stop)

100

ns (min)

TIMEOUT

SMBData or SMBCLK low time required to

reset the Serial Bus Interface to the Idle

State

ms (min)

ms (max)

Capacitive Load on SMBCLK and SMBData

400

pF (max)

DS100072-4

FIGURE 1. Serial Bus Timing Diagram

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