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| 型號： | SMJ44C251 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 262144 BY 4-BIT MULTIPORT VIDEO RAM |
| 中文描述： | 262144 4位多端口視頻內(nèi)存 |
| 文件頁數(shù)： | 3/53頁 |
| 文件大?。?/td> | 950K |
| 代理商： | SMJ44C251 |
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SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
3
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
description (continued)
Enhanced page-mode operation allows faster memory access by keeping the same row address while selecting
random column addresses. The time for row-address setup, row-address hold, and address multiplex is
eliminated, and a memory cycle time reduction of up to 3
×
can be achieved, compared to minimum RAS cycle
times. The maximum number of columns that can be accessed is determined by the maximum RAS low time
and page-mode cycle time used. The SMJ44C251B allows a full page (512 cycles) of information to be
accessed in read, write, or read-modify-write mode during a single RAS-low period using relatively conservative
page-mode cycle times.
The SMJ44C251B employs state-of-the-art technology for very high performance combined with improved
reliability. For surface mount technology, the SMJ44C251B is offered in a 28-pin J-leaded chip carrier package
(HJ suffix) or a 28-pin leadless ceramic chip carrier package (HM suffix). The SMJ44C251B is offered in a 28-pin
400-mil dual-in-line ceramic sidebrazed package (JD suffix) or a 28-pin ZIP ceramic package (SV suffix) for
through-hole insertion. The L suffix device is rated for operation from 0
°
C to 70
°
C. The M suffix device is rated
for operation from – 55
°
C to 125
°
C.
The SMJ44C251B and other multiport video RAMs are supported by a broad line of video/graphic processors
from Texas Instruments, including the SMJ34010 and the SMJ34020 graphics processors.
functional block diagram
Column Decoder
Sense Amplifier
Split Register
ééééé
ééééé
ééééé
Pointer
Data Transfer
Register
W/B
Unlatch
W/B
Latch
Address
Mask
Write-
Per-Bit
Control
MUX
QSF
DQ0
DQ1
DQ2
DQ3
DSF
SDQ0
SDQ1
SDQ2
SDQ3
VCC
VSS
A0
A1
A2
A3
A4
A5
A6
A7
A8
RAS
CAS
TRG
W
SC
SE
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相關(guān)PDF資料 |
PDF描述 |
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| SMJ44C256 | 262144 BY 4-BIT DYNAMIC RANDOM-ACCESS MEMORY |
| SMJ55161 | 262144 BY 16-BIT MULTIPORT VIDEO RAM |
| SMJ55166 | 262144 BY 16-BIT MULTIPORT VIDEO RAM |
| SMJ626162 | 524288 BY 16-BIT BY 2-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORY |
| SML-010DT | Chip LEDs with reflectors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMJ44C251A-12JDM | 制造商:Texas Instruments 功能描述: |
| SMJ44C251B | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B10HJM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B-10HJM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B10HMM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
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