IDT7027L25G 데이터 시트보기 (PDF) - Integrated Device Technology
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IDT7027L25G Datasheet PDF : 19 Pages
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IDT7027S/L
High-Speed 32K x 16 Dual-Port Static RAM
Military, Industrial and Commercial Temperature Ranges
Truth Table I Chip Enable
CE
CE0
CE 1
Mode
V IL
V IH
Po rt Se le c te d (TTL Active )
L
< 0.2V
>VCC -0.2V
Po rt Se le c te d (CM OS A ctive )
V IH
X
Po rt De s e le c te d (TTL Inac tiv e )
X
H
> VCC -0.2V
V IL
Po rt De s e le c te d (TTL Inac tiv e )
X
Po rt De s e le c te d (CM OS Inac tiv e )
X
<0.2V
Po rt De s e le c te d (CM OS Inac tiv e )
NOTES:
1. Chip Enable references are shown above with the actual CE0 and CE1 levels, CE is a reference only.
2. Port "A" and "B" references are located where CE is used.
3. "H" = VIH and "L" = VIL.
3199 tbl 02
Truth Table II Non-Contention Read/Write Control
Inputs(1)
Outputs
C E(2)
R/W
OE
UB
LB
SEM
I/O8-15
I/O0-7
Mode
H
X
X
X
X
H
High-Z
High-Z Deselected: Power-Down
X
X
X
H
H
H
High-Z
High-Z Both Bytes Deselected
L
L
X
L
H
H
DATAIN
High-Z Write to Upper Byte Only
L
L
X
H
L
H
High-Z
DATAIN Write to Lower Byte Only
L
L
X
L
L
H
DATAIN
DATAIN Write to Both Bytes
L
H
L
L
H
H
DATAOUT High-Z Read Upper Byte Only
L
H
L
H
L
H
High-Z DATAOUT Read Lower Byte Only
L
H
L
L
L
H
DATAOUT DATAOUT Read Both Bytes
X
X
H
X
X
X
High-Z
High-Z Outputs Disabled
NOTES:
1. A0L — A14L ≠ A0R — A14R.
2. Refer to Chip Enable Truth Table.
3199 tbl 03
Truth Table III Semaphore Read/Write Control
Inputs(1)
Outputs
CE(2)
R/W
OE
UB
LB
SEM
I/O8-15
I/O0-7
Mode
H
H
L
X
X
L
DATAOUT DATAOUT Read Data in Semaphore Flag
X
H
L
H
H
L
DATAOUT DATAOUT Read Data in Semaphore Flag
H
↑
X
X
X
L
DATAIN
DATAIN Write I/O0 into Semaphore Flag
X
↑
X
H
H
L
DATAIN
DATAIN Write I/O0 into Semaphore Flag
L
X
X
L
X
L
______
______
Not Allowed
L
X
X
X
L
L
______
______
Not Allowed
NOTES:
1. There are eight semaphore flags written to via I/O0 and read from all the I/Os (I/O0 __I/O15). These eight semaphore flags are addressed by A0-A2.
2. Refer to Chip Enable Truth Table.
3199 tbl 04
6.442
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