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IDT7027L25GB Datasheet(PDF) 4 Page - Integrated Device Technology

Part # IDT7027L25GB
Description  HIGH-SPEED 32K x 16 DUAL-PORT STATIC RAM
Download  19 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT7027L25GB Datasheet(HTML) 4 Page - Integrated Device Technology

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6.42
IDT7027S/L
High-Speed 32K x 16 Dual-Port Static RAM
Military, Industrial and Commercial Temperature Ranges
4
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.
Truth Table I – Chip Enable
Truth Table II – Non-Contention Read/Write Control
NOTES:
1. A0L — A14L
≠ A0R — A14R.
2. Refer to Chip Enable Truth Table.
Truth Table III – Semaphore Read/Write Control
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.
CE
CE0
CE1
Mode
L
V IL
V IH
Po rt Se le c te d (TTL Active )
< 0.2V
> V CC -0.2V
P ort S e le c ted (CM O S Active )
H
V IH
X
P ort De s e le c ted (TTL Inac tiv e )
XV IL
P o rt De se le cte d (TTL Inac tive )
> V CC -0.2V
X
P o rt De s e le c te d (CM O S Inac tiv e )
X< 0.2V
P o rt De se le cte d (CM O S Inac tive )
3199 tbl 02
Inputs
(1)
Outputs
Mode
CE(2)
R/
W
OE
UB
LB
SEM
I/O8-15
I/O0-7
H
XXXX
H
High-Z
High-Z
Deselected: Power-Down
X
X
X
H
H
H
High-Z
High-Z
Both Bytes Deselected
LL
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
LL
X
L
L
H
DATAIN
DATAIN
Write to Both Bytes
LH
L
L
H
H
DATAOUT
High-Z
Read Upper Byte Only
LH
LH
LH
High-Z
DATAOUT
Read Lower Byte Only
LH
L
L
LH
DATAOUT
DATAOUT
Read Both Bytes
X
X
H
X
X
X
High-Z
High-Z
Outputs Disabled
3199 tbl 03
Inputs
(1)
Outputs
Mode
CE(2)
R/
W
OE
UB
LB
SEM
I/O8-15
I/O0-7
HH
L
X
X
L
DATAOUT
DATAOUT
Read Data in Semaphore Flag
XH
L
H
H
L
DATAOUT
DATAOUT
Read Data in Semaphore Flag
H
XXX
L
DATAIN
DATAIN
Write I/O0 into Semaphore Flag
X
XH
H
L
DATAIN
DATAIN
Write I/O0 into Semaphore Flag
L
X
XL
XL
______
______
Not Allowed
L
XXX
L
L
______
______
Not Allowed
3199 tbl 04


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