MCM44D64 View Datasheet(PDF) - Motorola => Freescale
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MCM44D64 Datasheet PDF : 8 Pages
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AC OPERATING CONDITIONS AND CHARACTERISTICS
(VCC = 5.0 V ± 10%, TA = 0 to + 70°C, Unless Otherwise Noted)
Input Timing Measurement Reference Level . . . . . . . . . . . . . . . 1.5 V
Input Pulse Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 3.0 V
Input Rise/Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ns
Output Timing Measurement Reference Level . . . . . . . . . . . . . 1.5 V
Output Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure 1A
READ CYCLE (See Notes 1 and 2)
–12
Parameter
Symbol Min Max
Address Access Time
tAVQV
—
12
A0 Access Time
Data/Tag Enable Access Time
tA0QV
—
10
tELQV
—
12
Output Enable Access Time
Output Hold from Address Change
Output Hold from A0 Change
tGLQV
—
9
tAXQX
4
—
tA0XQX
4
—
Data/Tag Enable Low to Output Active
Data/Tag Enable High to Output High–Z
Output Enable Low to Output Active
tELQX
2
—
tEHQZ
1
9
tGLQX
1
—
Output Enable High to Output High–Z
tGHQZ
1
9
NOTES:
1. WE is high for read cycle.
2. Enable timings are the same for both DCS and TCS.
3. Transition is measured 200 mV from steady–state voltage with load of Figure 1B.
4. This parameter is sampled and not 100% tested.
–15
Min Max
—
15
—
12
—
15
—
10
4
—
4
—
2
—
1
10
1
—
1
10
–17
Min Max Unit Notes
—
17
ns
—
14
ns
—
17
ns
—
11
ns
4
—
ns
4
—
ns
2
—
ns
3, 4
1
11
ns
3, 4
1
—
ns
3, 4
1
11
ns
3, 4
OUTPUT
AC TEST LOADS
Z0 = 50 Ω
RL = 50 Ω
VL = 1.5 V
OUTPUT
255 Ω
+5 V
480 Ω
5 pF
Figure 1A
Figure 1B
TIMING LIMITS
The table of timing values shows either a
minimum or a maximum limit for each param-
eter. Input requirements are specified from
the external system point of view. Thus, ad-
dress setup time is shown as a minimum
since the system must supply at least that
much time (even though most devices do not
require it). On the other hand, responses from
the memory are specified from the device
point of view. Thus, the access time is shown
as a maximum since the device never pro-
vides data later than that time.
MCM4464 SERIES
4
MOTOROLA FAST SRAM
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