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參數(shù)資料
| 型號(hào)： | SMJ44C251B |
| 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)： | 1/53頁 |
| 文件大小： | 913K |
| 代理商： | SMJ44C251B |
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A0–A8
CAS
DQ0–DQ3
SE
RAS
SC
SDQ0–SDQ3
TRG
W
DSF
QSF
VCC
VSS
GND
Address Inputs
Column Enable
DRAM Data In-Out/Write-Mask Bit
Serial Enable
Row Enable
Serial Data Clock
Serial Data In-Out
Transfer Register/Q Output Enable
Write-Mask Select/Write Enable
Special Function Select
Split-Register Activity Status
5-V Supply
Ground
Ground (Important: Not connected
to internal VSS)
PIN NOMENCLATURE
SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
1
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
Military Operating Temperature Range
– 55
°
C to 125
°
C
Performance Ranges:
ACCESS
TIME
ROW
COLUMN SERIAL
ADDRESS
ENABLE
(MAX)
ta(R)
’44C251B-10 100 ns
’44C251B-12 120 ns
Class B High-Reliability Processing
DRAM: 262144 Words
×
4 Bits
SAM: 512 Words
×
4 Bits
Single 5-V Power Supply (
±
10% Tolerance)
Dual Port Accessibility–Simultaneous and
Asynchronous Access From the DRAM and
SAM Ports
Bidirectional-Data-Transfer Function
Between the DRAM and the Serial-Data
Register
4
×
4 Block-Write Feature for Fast Area Fill
Operations; As Many as Four Memory
Address Locations Written per Cycle From
an On-Chip Color Register
Write-Per-Bit Feature for Selective Write to
Each RAM I/O; Two Write-Per-Bit Modes to
Simplify System Design
ACCESS ACCESS
TIME
ACCESS
TIME
SERIAL
ENABLE
(MAX)
ta(SE)
20 ns
25 ns
TIME
DATA
(MAX)
ta(SQ)
30 ns
35 ns
(MAX)
ta(C)
25 ns
30 ns
Enhanced Page-Mode Operation for Faster
Access
CAS-Before-RAS (CBR) and Hidden
Refresh Modes
All Inputs/Outputs and Clocks Are TTL
Compatible
Long Refresh Period
Every 8 ms (Max)
Up to 33-MHz Uninterrupted Serial-Data
Streams
3-State Serial I/Os Allow Easy Multiplexing
of Video-Data Streams
512 Selectable Serial-Register Starting
Locations
Packaging:
– 28-Pin J-Leaded Ceramic Chip Carrier
Package (HJ Suffix)
– 28-Pin Leadless Ceramic Chip Carrier
Package (HM Suffix)
– 28-Pin Ceramic Sidebrazed DIP
(JD Suffix)
– 28-Pin Zig-Zag In-Line (ZIP), Ceramic
Package (SV Suffix)
Split Serial-Data Register for Simplified
Real-Time Register Reload
description
The SMJ44C251B multiport video RAM is a
high-speed, dual-ported memory device. It
consists of a dynamic random-access memory
(DRAM) organized as 262144 words of 4 bits
each interfaced to a serial-data register or
serial-access memory (SAM) organized as 512
words of 4 bits each. The SMJ44C251B supports
three types of operation: random access to and
from the DRAM, serial access to and from the
serial register, and bidirectional transfer of data
between any row in the DRAM and the serial
register. Except during transfer operations, the
SMJ44C251B can be accessed simultaneously
and asynchronously from the DRAM and SAM
ports.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
1995, Texas Instruments Incorporated
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PDF描述 |
|---|---|
| SMJ4C1024-10HJ | 1048576 BY 1-BIT DYNAMIC RANDOM-ACCESS MEMORY |
| SMJ4C1024-10HK | 1048576 BY 1-BIT DYNAMIC RANDOM-ACCESS MEMORY |
| SMJ4C1024-10HL | 1048576 BY 1-BIT DYNAMIC RANDOM-ACCESS MEMORY |
| SMJ4C1024-10JD | 1048576 BY 1-BIT DYNAMIC RANDOM-ACCESS MEMORY |
| SMJ4C1024-10SV | 1048576 BY 1-BIT DYNAMIC RANDOM-ACCESS MEMORY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SMJ44C251B-10HMM | 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 |
| SMJ44C251B10JDM | 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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