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SN74ALS2238FNR 数据表(PDF) 6 Page - Texas Instruments

部件名 SN74ALS2238FNR
功能描述  32 X 9 X 2 ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74ALS2238FNR 数据表(HTML) 6 Page - Texas Instruments

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SN74ALS2238
32 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY
SDAS182 − APRIL 1990
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
SELECT-MODE CONTROL TABLE
CONTROL
OPERATION
SAB
SBA
A BUS
B BUS
L
L
Real-time B to A bus
Real-time A to B bus
L
H
FIFO B to A bus
Real-time A to B bus
H
L
Real-time B to A bus
FIFO A to B bus
H
H
FIFO B to A bus
FIFO A to B bus
OUTPUT-ENABLE CONTROL TABLE
CONTROL
OPERATION
GAB
GBA
A BUS
B BUS
H
H
A bus enabled
B bus enabled
L
H
A bus enabled
Isolation/ input to B bus
H
L
Isolation / input to A bus
B bus enabled
L
L
Isolation / input to A bus
Isolation/ input to B bus
programming procedure for depth of FIFO A
Program:
Step 1.
With RSTA at a high level, take DAF from a high level to a low level. The high-to-low transition on
DAF stores the binary value of A0 −A4 for use as the value of X in defining the depth of FIFO A.
Step 2.
With DAF held low, pulse the RSTA signal low. On the low-to-high transition of RSTA, FIFO A is set
to a depth of 32 − X, where X is the value of A0 −A4 stored above.
Step 3.
To redefine the depth of FIFO A to 32 words, hold DAF at a high level and pulse the RSTA signal low.
† The programming procedures used to define the depth of FIFO B are the same as the procedure above.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
−0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage: Control inputs
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA
0
°C to 70°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
−65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum junction temperature
150
°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.


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