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MT55L512L18P Datasheet(PDF) 18 Page - Micron Technology

Part # MT55L512L18P
Description  8Mb ZBT SRAM
Download  30 Pages
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Manufacturer  MICRON [Micron Technology]
Direct Link  http://www.micron.com
Logo MICRON - Micron Technology

MT55L512L18P Datasheet(HTML) 18 Page - Micron Technology

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8Mb: 512K x 18, 256K x 32/36 Pipelined ZBT SRAM
Micron Technology, Inc., reserves the right to change products or specifications without notice.
MT55L512L18P_2.p65 – Rev. 6/01
©2001, Micron Technology, Inc.
8Mb: 512K x 18, 256K x 32/36
PIPELINED ZBT SRAM
TRUTH TABLE
(Notes 5-10)
ADDRESS
ADV/
OPERATION
USED
C E # CE2# C E 2 Z Z
L D # R/W# B W x O E # CKE# C L K
D Q
NOTES
DESELECT Cycle
None
H
X
X
L
L
X
X
X
L
L-H High-Z
DESELECT Cycle
None
X
H
X
L
L
X
X
X
L
L-H High-Z
DESELECT Cycle
None
X
X
L
L
L
X
X
X
L
L-H High-Z
CONTINUE DESELECT Cycle
None
X
X
X
L
H
X
X
X
L
L-H High-Z
1
READ Cycle
External
L
L
H
L
L
H
X
L
L
L-H
Q
(Begin Burst)
READ Cycle
Next
X
X
X
L
H
X
X
L
L
L-H
Q
1, 11
(Continue Burst)
NOP/DUMMY READ
External
L
L
H
L
L
H
X
H
L
L-H High-Z
2
(Begin Burst)
DUMMY READ
Next
X
X
X
L
H
X
X
H
L
L-H High-Z
1, 2,
(Continue Burst)
11
WRITE Cycle
External
L
L
H
L
L
L
L
X
L
L-H
D
3
(Begin Burst)
WRITE Cycle
Next
X
X
X
L
H
X
L
X
L
L-H
D
1, 3,
(Continue Burst)
11
NOP/WRITE ABORT
None
L
L
H
L
L
L
H
X
L
L-H High-Z
2, 3
(Begin Burst)
WRITE ABORT
Next
X
X
X
L
H
X
H
X
L
L-H High-Z
1, 2,
(Continue Burst)
3, 11
IGNORE CLOCK EDGE
Current
X
X
X
L
X
X
X
X
H
L-H
4
(Stall)
SNOOZE MODE
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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