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TMS428169A Datasheet(PDF) 3 Page - Texas Instruments

Part # TMS428169A
Description  1048576 BY 16-BIT EXTENDED DATA OUT DYNAMIC RANDOM-ACCESS MEMORIES
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TMS428169A Datasheet(HTML) 3 Page - Texas Instruments

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TMS418169A, TMS428169A
1048576 BY 16-BIT EXTENDED DATA OUT
DYNAMIC RANDOM-ACCESS MEMORIES
SMKS892C – AUGUST 1996 – REVISED SEPTEMBER 1997
3
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
functional block diagram ( TMS418169A and TMS428169 A)
A0
A1
A9
32
16
16
Timing and Control
Column -
Address
Buffers
Row -
Address
Buffers
I/O
Buffers
Data-
In
Reg.
Data-
Out
Reg.
Column Decode
Sense Amplifiers
R
o
w
D
e
c
o
d
e
256K Array
256K Array
256K Array
256K Array
256K Array
256K Array
DQ0 – DQ15
RAS UCAS
W
OE
LCAS
16 of 32
Selection
32
10
10
10
32
32
operation
dual xCAS
Two xCAS pins (LCAS and UCAS) are provided to give independent control of the 16 data I/O pins
(DQ0 – DQ15), with LCAS corresponding to DQ0 – DQ7 and UCAS corresponding to DQ8 – DQ15. Each xCAS
going low enables its corresponding DQx pins.
In write cycles, data-in setup and hold times (tDS and tDH) and write-command setup and hold times (tWCS, tCWL,
and tWCH) must be satisfied for each individual xCAS to ensure writing into the storage cells of the corresponding
DQ pins.
Different modes of operation for upper and lower bytes in one cycle are not allowed, such as the example in
Figure 1.
RAS
UCAS
LCAS
W
Delay write
Early write
Figure 1. Illegal Dual-xCAS Operation


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