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LM78 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM78
Description  Microprocessor System Hardware Monitor
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM78 Datasheet(HTML) 7 Page - National Semiconductor (TI)

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AC Electrical Characteristics(Note 13) The following specifications apply for +4.25 V
DC ≤ VCC
+5.75 V
DC unless otherwise specified. Boldface limits apply for TA =TJ =TMIN to TMAX; all other limits TA =TJ =
25˚C.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 8)
(Note 9)
(Limits)
ISA TIMING CHARACTERISTICS
f
SYSCLK
System Clock (SYSCLK) Input Frequency
8.33
MHz
t
CS(setup)
CS Active to IORD/IOWR Active
10
ns (min)
t
CS (hold)
IORD/IOWR Inactive to CS Inactive
10
ns (min)
t
SA(setup)
Address Valid to IORD/IOWR Active
30
ns (min)
t
SA (hold)
IORD/IOWR Inactive to Address Invalid
10
ns (min)
ISA WRITE TIMING
t
SDWR(setup)
Data Valid to IOWR Active
5
ns (min)
t
SDWR (hold)
IOWR Inactive to Data Invalid
5
ns (min)
t
WR(setup)
IOWR Active to Rising Edge of SYSCLK
20
ns (min)
DS012873-4
The delay between consecutive IORD and IOWR pulses should be greater than 50 ns to ensure that an Power-on reset does not
occur unintentionally. (See Section 3.2 ‘Resets’ )
FIGURE 1. ISA Bus Write Timing Diagram
www.national.com
7


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