MCM32257B View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MCM32257B Datasheet PDF : 8 Pages
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WRITE CYCLE 1 (W Controlled, See Notes 1 and 2)
MCM32257B–15 MCM32257B–20 MCM32257B–25
Parameter
Symbol Min
Max
Min
Max
Min
Max Unit Notes
Write Cycle Time
tAVAV
15
—
20
—
25
—
ns
3
Address Setup Time
Address Valid to End of Write
tAVWL
0
—
0
—
0
—
ns
tAVWH
12
—
15
—
17
—
ns
Write Pulse Width
tWLWH,
12
—
15
—
17
—
ns
tWLEH
Data Valid to End of Write
tDVWH
7
—
8
—
10
—
ns
Data Hold Time
Write Low to Data High–Z
tWHDX
0
—
0
—
0
—
ns
tWLQZ
0
6
0
7
0
8
ns 4,5,6
Write High to Output Active
tWHQX
5
—
5
—
5
—
ns 4,5,6
Write Recovery Time
tWHAX
0
—
0
—
0
—
ns
NOTES:
1. A write occurs during the overlap of E low and W low.
2. E1 – E4 are represented by E in these timing specifications, any combination of Exs may be asserted. G is a don‘t care when W is low.
3. All write cycle timing is referenced from the last valid address to the first transitioning address.
4. Transition is measured ± 500 mV from steady–state voltage with load of Figure 1B.
5. This parameter is sampled and not 100% tested.
6. At any given voltage and temperature, tWLQZ max is less than tWHQX min both for a given device and from device to device.
A (ADDRESS)
Ex (BYTE ENABLE)
W (WRITE ENABLE)
D (DATA IN)
Q (DATA OUT)
WRITE CYCLE 1
tAVAV
tAVWH
tAVWL
HIGH–Z
tWLWH
tWLQZ
tDVWH
DATA VALID
HIGH–Z
tWHAX
tWHDX
tWHQX
MCM32257B
6–6
MOTOROLA FAST SRAM
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