as7c251mft18a ETC-unknow, as7c251mft18a Datasheet - Page 7

• Manufacturer Part Number: as7c251mft18a
• Description: 2.5v 1m X 18 Flowthrough Burst Synchronous Sram
• Manufacturer: ETC-unknow

Synchronous truth table
1 X = don’t care, L = low, H = high
2 For WRITE, L means any one or more byte write enable signals (BWa or BWb) and BWE are LOW or GWE is LOW. WRITE = HIGH for all BWx,
BWE, GWE HIGH. See "Snooze Mode," on page 5 for more information.
3
4 ZZ pin is always Low.
For write operation following a READ,
CE0
12/24/04, v. 1.2
H
X
X
X
X
H
H
H
H
X
H
X
H
L
L
L
L
L
L
L
L
L
1
CE1
X
X
X
H
H
H
H
X
X
X
X
X
X
X
X
H
X
X
X
X
L
L
CE2
X
X
X
H
H
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
L
ADSP
[4]
X
H
H
H
H
H
H
H
H
X
X
X
X
H
H
X
H
X
L
L
L
L
OE
ADSC
must be HIGH before the input data set up time and held HIGH throughout the input hold time
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
ADV
X
X
X
X
X
X
X
X
X
H
H
H
H
X
H
H
L
L
L
L
L
L
Alliance Semiconductor
WRITE
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
[2]
OE
X
X
X
X
X
H
H
H
H
H
H
X
X
X
X
X
L
L
L
L
L
L
®
External
External
External
External
External
accessed
Address
Current
Current
Current
Current
Current
Current
Next
Next
Next
Next
Next
Next
NA
NA
NA
NA
NA
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
CLK
AS7C251MFT18A
Continue write
Continue write
Continue read
Continue read
Continue read
Continue read
Suspend write
Suspend write
Suspend read
Suspend read
Suspend read
Suspend read
Begin write
Begin read
Begin read
Begin read
Begin read
Operation
Deselect
Deselect
Deselect
Deselect
Deselect
7 of 19
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
DQ
D
Q
Q
Q
Q
Q
Q
D
D
D
D
3