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MCM44256B Datasheet(PDF) 4 Page - Motorola, Inc

Part No. MCM44256B
Description  4MB R4000 Secondary Cache Fast Static RAM Module Set
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MCM44256B Datasheet(HTML) 4 Page - Motorola, Inc

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MCM44256B SERIES
4
MOTOROLA FAST SRAM
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)
P
Sb l
–12
–15
–17
Ui
N
Parameter
Symbol
Min
Max
Min
Max
Min
Max
Unit
Notes
Address Access Time
tAVQV
12
15
17
ns
A0 Access Time
tA0AQV
10
12
14
ns
Data/Tag Enable Access Time
tELQV
12
15
17
ns
Output Enable Access Time
tGLQV
9
10
11
ns
Output Hold from Address Change
tAXQX
4
4
4
ns
Output Hold from A0 Change
tA0XQX
4
4
4
ns
Data/Tag Enable Low to Output Active
tELQX
2
2
2
ns
3, 4
Data/Tag Enable High to Output High–Z
tEHQZ
1
9
1
10
1
11
ns
3, 4
Output Enable Low to Output Active
tGLQX
1
1
1
ns
3, 4
Output Enable High to Output High–Z
tGHQZ
1
9
1
10
1
11
ns
3, 4
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.
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.
TIMING LIMITS
OUTPUT
Z0 = 50 Ω
RL = 50 Ω
VL = 1.5 V
Figure 1. AC Test Load


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