6.42
IDT7024S/L
High-Speed 4K x 16 Dual-Port Static RAM Military, Industrial and Commercial Temperature Ranges
4
Truth Table I: Non-Contention Read/Write Control
Recommended DC Operating
Conditions
Truth Table II: Semaphore Read/Write Control
(1)
Absolute Maximum Ratings
(1)
NOTE:
1. There are eight semaphore flags written to via I/O
0 and read from all of the I/O's (I/O0 - I/O15).
These eight semaphores are addressed by A
0 - A2.
NOTE:
1. A
0L — A11L ≠ A0R — A11R
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS
may cause permanent damage to the device. This is a stress rating only
and functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect reliability.
2. V
TERM must not exceed Vcc +10% for more than 25% of the cycle time or 10ns
maximum, and is limited to
< 20mA for the period over VTERM > Vcc + 10%.
NOTES:
1. V
IL > -1.5V for pulse width less than 10ns.
2. V
TERM must not exceed Vcc + 10%.
Inputs
(1)
Outputs
Mode
CE
R/W
OE UB LB SEM
I/O
8-15
I/O
0-7
HXXXXHHigh-ZHigh-ZDeselcted: Power-Down
X X X H H H High-Z High-Z Both Bytes Deselected
LLXLHHDATA
IN
High-Z Write to Upper Byte Only
LLXHLHHigh-ZDATA
IN
Write to Lower Byte Only
LLXLLHDATA
IN
DATA
IN
Write to Both Bytes
LHLLHHDATA
OUT
High-Z Read Upper Byte Only
LHLHLHHigh-ZDATA
OUT
Read Lower Byte Only
LHLLLHDATA
OUT
DATA
OUT
Read Both Bytes
X X H X X X High-Z High-Z Outputs Disabled
27 40 tbl 03
Inputs
(1)
Outputs
Mode
CE
(2)
R/W
OE U B LB SEM
I/O
8-15
I/O
0-7
HHLXXLDATA
OUT
DATA
OUT
Read Semaphore Flag Data Out
XHLHHLDATA
OUT
DATA
OUT
Read Semaphore Flag Data Out
H
↑
XXXLDATA
IN
DATA
IN
Write I/O
0
into Semaphore Flag
X
↑
XHHLDATA
IN
DATA
IN
Write I/O
0
into Semaphore Flag
LXXLXL
____ ____
Not Allowed
LXXXLL
____ ____
Not Allowed
2740 tbl 04
Symbol Rating Commercial
& Industrial
Military Unit
V
TERM
(2)
Terminal Voltage
with Respect
to GND
-0.5 to +7.0 -0.5 to +7.0 V
T
BIAS
Temperature
Under Bias
-55 to +125 -65 to +135
o
C
T
STG
Storage
Temperature
-65 to +150 -65 to +150
o
C
I
OUT
DC Output
Current
50 50 mA
2740 tbl 05
Symbol Parameter Min. Typ. Max. Unit
V
CC
Supply Voltage 4.5 5.0 5.5 V
GND Ground 0 0 0 V
V
IH
Input High Voltage 2.2
____
6.0
(2 )
V
V
IL
Input Low Voltage -0.5
(1 )
____
0.8 V
2740 tbl 06