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IDT70V28L Datasheet(PDF) 4 Page - Integrated Device Technology

Part No. IDT70V28L
Description  HIGH-SPEED 3.3V 64K x 16 DUAL-PORT STATIC RAM High-speed access
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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IDT70V28L Datasheet(HTML) 4 Page - Integrated Device Technology

 
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IDT70V28L
High-Speed 3.3V 64K x 16 Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
4
Truth Table III – Semaphore Read/Write Control(1)
Truth Table I – Chip Enable(1,2)
NOTES:
1.
Chip Enable references are shown above with the actual
CE0 and CE1 levels; CE is a reference only.
2.
'H' = VIH and 'L' = VIL.
3.
CMOS standby requires 'X' to be either < 0.2V or >VCC-0.2V.
Truth Table II – Non-Contention Read/Write Control
NOTES:
1.
A0L — A15L
≠ A0R — A15R
2. Refer to Truth Table I - Chip Enable.
NOTES:
1. There are eight semaphore flags written to I/O0 and read from all the I/Os (I/O0-I/O15). These eight semaphore flags are addressed by A0-A2.
2.
Refer toTruth Table I -
Chip Enable.
CE
CE0
CE1
Mode
L
VIL
V IH
Port Selected (TTL Active)
< 0.2V
>VCC -0.2V
Port Selected (CMOS Active)
H
VIH
X
Port Deselected (TTL Inactive)
XVIL
Port Deselected (TTL Inactive)
>VCC -0.2V
X
(3)
Port Deselected (CMOS Inactive)
X(3)
<0.2V
Port Deselected (CMOS Inactive)
4849tbl 06
Inputs(1)
Outputs
Mode
CE(2)
R/
W
OE
UB
LB
SEM
I/O8-15
I/O0-7
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
LL
X
L
H
H
DATAIN
High-Z
Write to Upper Byte Only
LL
X
H
L
H
High-Z
DATAIN
Write to Lower Byte Only
L
L
X
LLH
DATAIN
DATAIN
Write to Both Bytes
LH
L
L
H
H
DATAOUT
High-Z
Read Upper Byte Only
L
H
LH
LH
High-Z
DATAOUT
Read Lower Byte Only
L
H
L
LLH
DATAOUT
DATAOUT
Read Both Bytes
X
X
H
X
X
X
High-Z
High-Z
Outputs Disabled
4849 tbl 07
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
XX
X
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
LX
X
X
L
L
______
______
Not Allowed
4849 tbl 08


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