LM79 NSC [National Semiconductor], LM79 Datasheet - Page 8

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

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ISA READ TIMING
t
t
t
t
SDRD
SDRD
RD
RS
AC Electrical Characteristics
+5.75 V
25˚C. (Continued)
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’ )
(setup)
(delay)
Symbol
(setup)
(hold)
DC
unless otherwise specified. Boldface limits apply for T
Valid
Data Valid to IORD Inactive
IORD Inactive to Data Invalid
IORD Active to Rising Edge of SYSCLK
Rising Edge of SYSCLK number 1 to Data
Parameter
FIGURE 2. ISA Bus Read Timing Diagram
(Note 13) The following specifications apply for +4.25 V
8
A
With 8.33 MHz
SYSCLK
= T
Conditions
J
= T
MIN
to T
MAX
(Note 8)
Typical
; all other limits T
(Note 9)
Limits
120
360
DC
20
5
DS100036-5
A
= T
V
CC
J
=
ns (max)
(Limits)
ns (min)
ns (min)
ns (min)
Units