MCM6249 データシートの表示（PDF） - Motorola => Freescale
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MCM6249 Datasheet PDF : 7 Pages
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WRITE CYCLE 2 (E Controlled, See Notes 1, 2, and 3)
MCM6249–20 MCM6249–25 MCM6249–35
Parameter
Symbol Min Max Min Max Min Max Unit Notes
Write Cycle Time
Address Setup Time
Address Valid to End of Write
Enable Pulse Width
tAVAV
20
—
25
—
35
—
ns
4
tAVEL
0
—
0
—
0
—
ns
tAVEH
15
—
17
—
20
—
ns
tELEH,
15
—
17
—
20
—
ns
5,6
tELWH
Write Pulse Width
tWLEH
15
—
17
—
20
—
ns
Data Valid to End of Write
tDVEH
10
—
10
—
15
—
ns
Data Hold Time
tEHDX
0
—
0
—
0
—
ns
Write Recovery Time
tEHAX
0
—
0
—
0
—
ns
NOTES:
1. A write occurs during the overlap of E low and W low.
2. Product sensitivities to noise require proper grounding and decoupling of power supplies as well as minimization or elimination of bus con–
tention conditions during read and write cycles.
3. If G goes low coincident with or after W goes low, the output will remain in a high–impedance state.
4. All write cycle timing is referenced from the last valid address to the first transitioning address.
5. If E goes low coincident with or after W goes low, the output will remain in a high impedance condition.
6. If E goes high coincident with or before W goes high, the output will remain in a high impedance condition.
A (ADDRESS)
E (CHIP ENABLE)
W (WRITE ENABLE)
D (DATA IN)
Q (DATA OUT)
WRITE CYCLE 2 (E Controlled, See Notes 1, 2, and 3)
tAVAV
tAVEL
tAVEH
tELEH
tELWH
tWLEH
tDVEH
DATA VALID
HIGH–Z
tEHAX
tEHDX
Motorola Memory Prefix
Part Number
MCM6249
6
ORDERING INFORMATION
(Order by Full Part Number)
MCM 6249 XX XX XX
Shipping Method (R2 = Tape and Reel, Blank = Rails)
Speed (20 = 20 ns, 25 = 25 ns, 35 = 35 ns)
Package (WJ = 400 mil SOJ)
Full Part Numbers — MCM6249WJ20 MCM6249WJ20R2
MCM6249WJ25 MCM6249WJ25R2
MCM6249WJ35 MCM6249WJ35R2
MOTOROLA FAST SRAM
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