SMJ44C251B Datasheet, PDF (1/57 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
256K X 4 VRAM
256K x 4 DRAM
with 512K x 4 SAM
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-89497
• MIL-STD-883
FEATURES
• 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
• 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
• Split Serial-Data Register for Simplified Real-Time Register Reload
OPTIONS
MARKING
• Timing
100ns, 30ns/27ns
-10
120ns, 35ns/35ns
-12
• Package(s)
Ceramic SOJ
Ceramic DIP (400 mil)
Ceramic LCC
Ceramic Flat Pack
Ceramic ZIP
Ceramic LCC
MT Prefix
DCJ
C
EC
F
CZ
---
SMJ Prefix
---
JDM
HMM
---
SVM
HJM
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www.austinsemiconductor.com
PIN ASSIGNMENT
(Top View)
28-Pin DIP (C)
(400 MIL)
28-Pin SOJ (DCJ)
28-Pin LCC (EC)
SC 1
SDQ1 2
SDQ2 3
TR\/OE\ 4
DQ1 5
DQ2 6
ME\/WE\ 7
NC 8
RAS\ 9
A8 10
A6 11
A5 12
A4 13
Vcc 14
28 Vss
27 SDQ4
26 SDQ3
25 SE\
24 DQ4
23 DQ3
22 DSF
21 CAS\
20 QSF
19 A0
18 A1
17 A2
16 A3
15 A7
SC 1
SDQ1 2
SDQ2 3
TR\/OE\ ⁴
DQ1 ⁵
DQ2 ⁶
ME\/WE\ ⁷
NC ⁸
RAS\ ⁹
A8 ¹⁰
A6 ¹¹
A5 ¹²
A4 ¹³
Vcc ¹⁴
28 Vss
27 SDQ4
26 SDQ3
25 SE\
24 DQ4
23 DQ3
22 DSF
21 CAS\
20 QSF
19 A0
18 A1
17 A2
16 A3
15 A7
28-Pin ZIP (CZ)
DSF
DQ3
SDQ2
Vss
SDQ0
TRG\
DQ1
GND
A8
A5
Vcc
A3
A1
QSF
1
32
54
76
98
11 ¹⁰
13 ¹²
15 ¹⁴
17 ¹⁶
19 ¹⁸
21
23
25
27
20
22
24
26
28
DQ2
SE\
SDQ3
SC
SDQ1
DQ0
W\
RAS\
A8
A4
A7
A2
A0
CAS\
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
RAS\
A8
A6
A5
A4
Vcc
28-Pin FP (F)
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
Vss
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
CAS\
QSF
A0
A1
A2
A3
A7
PIN NAME
(SMJ)
PIN NAME
(MT)
DESCRIPTION
A0 - A8
A0 - A8 Address Inputs
CAS\
CAS\ Column Enable
DQ0 - DQ3 DQ1 - DQ4 DRAM Data In-Out/Write-Mask Bit
SE\
SE\
Serial Enable
RAS\
RAS\ Row Enable
SC
SC
Serial Data Clock
SDQ0 - SDQ3 SDQ1 - SDQ4 Serial Data In-Out
TRG\
TR\ /OE\ Transfer Register/Q Output Enable
W\
ME\ /WE\ Write-Mask Select/Write Enable
DSF
DSF
Special Function Select
QSF
QSF
Split-Register Activity Status
Vcc
Vcc
5V Supply
Vss
Vss
Ground
Ground (Important: Not Connected to
GND
NC
internal Vss, Pin should be left open or
tied to ground.
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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