LM79 datasheet(8/31 Pages) NSC

Numer części	LM79

Szczegółowy opis	Microprocessor System Hardware Monitor

PDF	31 Pages

Scroll/Zoom	100%

Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

Logo

8 / 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)

Symbol

Parameter

Conditions

Typical

Limits

Units

(Note 8)

(Note 9)

(Limits)

ISA READ TIMING

SDRD(setup)

Data Valid to IORD Inactive

120

ns (min)

SDRD (hold)

IORD Inactive to Data Invalid

ns (min)

RD(setup)

IORD Active to Rising Edge of SYSCLK

ns (min)

RS (delay)

Rising Edge of SYSCLK number 1 to Data

Valid

With 8.33 MHz

SYSCLK

360

ns (max)

DS100036-5

The delay between consecutive IORD and IOWR pulses should be greater than 50 ns to ensure that a Power-on reset does not

occur unintentionally. (See

Section 3.2 ‘Resets’ )

FIGURE 2. ISA Bus Read Timing Diagram

LM79 Arkusz danych(PDF) 8 Page - National Semiconductor (TI)