MX66C256
KEY TO SWITCHING WAVEFORMS
AC TEST CONDITIONS
Input Pulse Levels
Input Rise and Fall Times
Input and Output
5.0/V0V
WAVEFORM
INPUTS
OUTPUTS
5ns
MUST BE
STEADY
MUST BE
STEADY
2.5V
Timing Reference Level
MAY CHANGE
FROM H TO L
WILL BE
CHANGE
FROM H TO L
AC TEST LOADS AND WAVEFORMS
MAY CHANGE
FROM L TO H
WILL BE
CHANGE
1923 W
1923 W
5.0V
5.0V
FROM L TO H
OUTPUT
OUTPUT
,
DON T CARE:
CHANGE :
STATE
UNKNOWN
100PF
5PF
ANY CHANGE
PERMITTED
INCLUDING
JIG AND
SCOPE
INCLUDING
JIG AND
SCOPE
W
1020W
1020
DOES NOT
APPLY
CENTER
FIGURE 1A
FIGURE 1B
LINE IS HIGH
IMPEDANCE
¡¨OFF ¡¨STATE
THEVENIN EQUIVALENT
667 W
OUTPUT
10%
1.73V
ALL INPUT PULSES
VCC
GND
10%
90% 90%
®
®
¬
¬ 5ns
FIGURE 2
AC ELECTRICAL CHARACTERISTICS (over the operating range)
READ CYCLE
JEDEC
PARAMETER
NAME
DESCRIPTION
UNIT
MX66C256-70
MX66C256-10
PARAMETER
NAME
MIN.
TYP. MAX. MIN. TYP. MAX.
tAVAX
tAVQV
tELQV
tGLQV
tELQX
tGLQX
tEHQZ
tGHQZ
tAZQX
tRC
tAA
70
Read Cycle Time
100
ns
ns
ns
ns
ns
ns
ns
ns
ns
Address Access Time
70
70
50
100
100
50
tACS
tOE
tCLZ
tOLZ
tCHZ
tOHZ
tOH
Chip Select Access Time
Output Enable to Output Valid
Chip Select to Output Low Z
Output Enable to Output in Low Z
Chip Deselect to Output in High Z
Output Disable to Output in High Z
Output Disable to Output Address Change
10
10
0
10
10
0
35
30
35
30
0
0
10
10
1. Typical characteristics are at Vcc = 5.0V, T
= 25oC.
A
SWITCHING WAVEFORMS (READ CYCLE)
READ CYCLE1 (1,2,4)
t
RC
ADDRESS
t
AA
t
OH
t
OH
D OUT
P/N DS0035
Rev. 1.1, Jan., 2000
4
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