參數(shù)資料
型號(hào)： MT55L256L36F
廠商： Micron Technology, Inc.
英文描述： 8Mb: 256K x 36，F(xiàn)low-Through ZBT SRAM(8Mb流通式同步靜態(tài)存儲(chǔ)器)
中文描述： 8MB的：256K × 36，流量通過(guò)ZBT SRAM的（8兆流通式同步靜態(tài)存儲(chǔ)器）
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 380K
代理商： MT55L256L36F
14
8Mb: 512K x 18, 256K x 32/36 Flow-Through ZBT SRAM
MT55L512L18F_2.p65 – Rev. 8/00
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2000, Micron Technology, Inc.
8Mb: 512K x 18, 256K x 32/36
FLOW-THROUGH ZBT SRAM
TRUTH TABLE
(Notes 5-10)
ADDRESS
USED
None
None
None
None
External
ADV/
LD#
L
L
L
H
L
OPERATION
DESELECT Cycle
DESELECT Cycle
DESELECT Cycle
CONTINUE DESELECT Cycle
READ Cycle
(Begin Burst)
READ Cycle
(Continue Burst)
NOP/DUMMY READ
(Begin Burst)
DUMMY READ
(Continue Burst)
WRITE Cycle
(Begin Burst)
WRITE Cycle
(Continue Burst)
NOP/WRITE ABORT
(Begin Burst)
WRITE ABORT
(Continue Burst)
IGNORE CLOCK EDGE
(Stall)
SNOOZE MODE
CE# CE2# CE2
H
X
X
H
X
X
X
X
L
L
ZZ
L
L
L
L
L
R/W#
X
X
X
X
H
BWx
X
X
X
X
X
OE# CKE#
X
X
X
X
L
CLK
L-H
L-H
L-H
L-H
L-H
DQ
High-Z
High-Z
High-Z
High-Z
Q
NOTES
X
X
L
X
H
L
L
L
L
L
1
Next
X
X
X
L
H
X
X
L
L
L-H
Q
1, 11
External
L
L
H
L
L
H
X
H
L
L-H
High-Z
2
Next
X
X
X
L
H
X
X
H
L
L-H
High-Z
1, 2,
11
3
External
L
L
H
L
L
L
L
X
L
L-H
D
Next
X
X
X
L
H
X
L
X
L
L-H
D
1, 3,
11
2, 3
None
L
L
H
L
L
L
H
X
L
L-H
High-Z
Next
X
X
X
L
H
X
H
X
L
L-H
High-Z
1, 2,
3, 11
4
Current
X
X
X
L
X
X
X
X
H
L-H
–
None
X
X
X
H
X
X
X
X
X
X
High-Z
NOTE:
1. CONTINUE BURST cycles, whether READ or WRITE, use the same control inputs. The type of cycle performed (READ or
WRITE) is chosen in the initial BEGIN BURST cycle. A CONTINUE DESELECT cycle can only be entered if a DESELECT cycle
is executed first.
2. DUMMY READ and WRITE ABORT cycles can be considered NOPs because the device performs no external operation.
A WRITE ABORT means a WRITE command is given, but no operation is performed.
3. OE# may be wired LOW to minimize the number of control signals to the SRAM. The device will automatically turn off
the output drivers during a WRITE cycle. OE# may be used when the bus turn-on and turn-off times do not meet an
application’s requirements.
4. If an IGNORE CLOCK EDGE command occurs during a READ operation, the DQ bus will remain active (Low-Z). If it
occurs during a WRITE cycle, the bus will remain in High-Z. No WRITE operations will be performed during the IGNORE
CLOCK EDGE cycle.
5. X means “ Don’t Care.” H means logic HIGH. L means logic LOW. BWx = H means all byte write signals (BWa#, BWb#,
BWc# and BWd#) are HIGH. BWx = L means one or more byte write signals are LOW.
6. BWa# enables WRITEs to Byte “ a” (DQa pins); BWb# enables WRITEs to Byte “ b” (DQb pins); BWc# enables WRITEs to
Byte “ c” (DQc pins); BWd# enables WRITEs to Byte “ d” (DQd pins).
7. All inputs except OE# and ZZ must meet setup and hold times around the rising edge (LOW to HIGH) of CLK.
8. Wait states are inserted by setting CKE# HIGH.
9. This device contains circuitry that will ensure that the outputs will be in High-Z during power-up.
10. The device incorporates a 2-bit burst counter. Address wraps to the initial address every fourth BURST cycle.
11. The address counter is incremented for all CONTINUE BURST cycles.
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參數(shù)描述
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