MCM44256B View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
MFG CO.
MCM44256B 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 . . . . . . . . . . . . . . . . . . . . . . 1 V/ns (20% to 80%)
Output Timing Measurement Reference Level . . . . . . . . . . . . . 1.5 V
Output Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure 1
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
Output Enable Access Time
tA0AQV
—
10
tELQV
—
12
tGLQV
—
9
Output Hold from Address Change
Output Hold from A0 Change
Data/Tag Enable Low to Output Active
tAXQX
4
—
tA0XQX
4
—
tELQX
2
—
Data/Tag Enable High to Output High–Z
Output Enable Low to Output Active
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.
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
—
17
—
14
—
17
—
11
4
—
4
—
2
—
1
11
1
—
1
11
Unit Notes
ns
ns
ns
ns
ns
ns
ns
3, 4
ns
3, 4
ns
3, 4
ns
3, 4
OUTPUT
Z0 = 50 Ω
RL = 50 Ω
VL = 1.5 V
Figure 1. AC Test Load
TIMING LIMITS
The table of timing values shows either a minimum
or a maximum limit for each parameter. Input require-
ments are specified from the external system point of
view. Thus, address setup time is shown as a mini-
mum since the system must supply at least that much
time. 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 provides data later than that time.
MCM44256B SERIES
4
MOTOROLA FAST SRAM
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