82527

AC Characteristics for 8-Bit Non-Multiplexed Synchronous Mode (Mode 3)

Symbol

Parameter

Min

Max

Oscillator Frequency

8 MHz

16 MHz

System Clock Frequency

4 MHz

10 MHz

Memory Clock Frequency

2 MHz

8 MHz

E High to Data Valid out of High Speed

55 ns

Register (02H 04H 05H)

Read Cycle without Previous Write for

Read Cycle with Previous Write for

Data Hold after E Low for a Read

5 ns

Cycle

Data Float after E Low

35 ns

Data Hold after E Low for a Write Cycle

15 ns

Address and RW

to E Setup

25 ns

Address and RW

Valid after E Falls

15 ns

CS

Valid to E High

0 ns

CS

Valid after E Low

0 ns

Data Setup to E Low

55 ns

E Active Width

100 ns

Start of a Write Cycle after a Previous

Write Access

Address or RW

to CS

Low Setup

3 ns

CS

High to Address Invalid

7 ns

CLKOUT Period

CLKOUT High Period

NOTES

1 Definition of ‘‘Read Cycle without a Previous Write’’ The time between the falling edge of E (for the previous write cycle)

15