9

7843A–AERO–10/09

AT68166HT

AC Characteristics

Temperature Range:................................................................................................. -55 +125

°C

Supply Voltage: ........................................................................................................... 3.3 +0.3V

Input Pulse Levels: ................................................................................................. GND to 3.0V

Input Rise and Fall Times:................................................................................... 3ns (10 - 90%)

Input and Output Timing Reference Levels: ........................................................................ 1.5V

Figure 4. AC Test Loads Waveforms

Write Cycle

Notes: 1. Timings figures applicable for 8-bit, 16-bit and 32-bit mode.

2. Parameters guaranteed, not tested, with output loading 5 pF. (See “AC Test Loads Wave-

forms” on page 9.)

Specific (TWLQZ, TWHQX, TELQX, TEHQZ

TGLQX, TGHQZ)

General

Symbol

Parameter

AT68166HT-25

AT68166HT-20

AT68166HT-18

(preliminary)

Unit

min

max

min

max

min

max

TAVAW

Write cycle time

20

-

20

-

18

-

ns

TAVWL

Address set-up time

2

-

2

-

2

-

ns

TAVWH

Address valid to end of write

14

-

11

-

10

-

ns

TDVWH

Data set-up time

9

-

8

-

7

-

ns

TELWH

CS low to write end

12

-

12

-

11

-

ns

TWLQZ

-10-

10

-

9

ns

TWLWH

Write pulse width

12

-

9

-

9

-

ns

TWHAX

Address hold from end of

write

0-0

-

0-

ns

TWHDX

Data hold time

2

-

1

-

1

-

ns

TWHQX

5-5

-

5-

ns