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SN74ACT7200L25DV Scheda tecnica(PDF) 5 Page - Texas Instruments

Il numero della parte SN74ACT7200L25DV
Spiegazioni elettronici  256 횞 9, 512 횞 9, 1024 횞 9 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ACT7200L25DV Scheda tecnica(HTML) 5 Page - Texas Instruments

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SN74ACT7200L, SN74ACT7201LA, SN74ACT7202LA
256
× 9, 512 × 9, 1024 × 9
ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES
SCAS221A – FEBRUARY 1993 – REVISED SEPTEMBER 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional block diagram
Read
Pointer
Location 1
Location 2
256
× 9 or
512
× 9 or
1024
× 9
RAM
Write
Pointer
Write
Control
Reset
Logic
Read
Control
Status-
Flag
Logic
Expansion
Logic
RS
W
XI
FL /RT
R
D0 – D8
Q0 – Q8
FF
EF
XO/HF
9
9
† 256
× 9 for SN74ACT7200L; 512 × 9 for SN74ACT7201LA; 1024 × 9 for SN74ACT7202LA
RESET AND RETRANSMIT FUNCTION TABLE
(single-device depth; single-or multiple-device width)
INPUTS
INTERNAL TO DEVICE
OUTPUTS
FUNCTION
RS
FL/RT
XI
READ POINTER
WRITE POINTER
EF
FF
XO/HF
FUNCTION
L
X
L
Location zero
Location zero
L
H
H
Reset device
H
L
L
Location zero
Unchanged
X
X
X
Retransmit
H
H
L
Increment if EF high
Increment if FF high
X
X
X
Read/write
RESET AND FIRST- LOAD FUNCTION TABLE
(multiple-device depth; single-or multiple-device width)
INPUTS
INTERNAL TO DEVICE
OUTPUTS
FUNCTION
RS
FL/RT
XI
READ POINTER
WRITE POINTER
EF
FF
FUNCTION
L
L
Location zero
Location zero
L
H
Reset first device
L
H
Location zero
Location zero
L
H
Reset all other devices
H
X
X
X
X
X
Read/write
‡ XI is connected to XO/HF of the previous device in the daisy chain (see Figure 15).


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