Austin Semiconductor, Inc.
256K X 4 VRAM
256K x 4 DRAM
with 512K x 4 SAM
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-89497
• MIL-STD-883
SMJ44C251B
MT42C4256
PIN ASSIGNMENT
(Top View)
VRAM
28-Pin DIP (C)
(400 MIL)
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
RAS\
A8
A6
A5
A4
Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Vss
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
CAS\
QSF
A0
A1
A2
A3
A7
28-Pin SOJ (DCJ)
28-Pin LCC (EC)
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
RAS\
A8
A6
A5
A4
Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Vss
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
CAS\
QSF
A0
A1
A2
A3
A7
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
28-Pin ZIP (CZ)
DSF
DQ3
SDQ2
Vss
SDQ0
TRG\
DQ1
GND
A8
A5
Vcc
A3
A1
QSF
1
3
5
7
9
11
13
15
17
19
21
23
25
27
2
4
6
8
10
12
14
16
18
20
22
24
26
28
DQ2
SE\
SDQ3
SC
SDQ1
DQ0
W\
RAS\
A8
A4
A7
A2
A0
CAS\
28-Pin FP (F)
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
RAS\
A8
A6
A5
A4
Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Vss
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
CAS\
QSF
A0
A1
A2
A3
A7
OPTIONS
• Timing
100ns, 30ns/27ns
120ns, 35ns/35ns
• Package(s)
Ceramic SOJ
Ceramic DIP (400 mil)
Ceramic LCC
Ceramic Flat Pack
Ceramic ZIP
Ceramic LCC
MARKING
-10
-12
MT Prefix
DCJ
C
EC
F
CZ
---
SMJ Prefix
---
JDM
HMM
---
SVM
HJM
For more products and information
please visit our web site at
www.austinsemiconductor.com
PIN NAME
PIN NAME
(SMJ)
(MT)
A0 - A8
A0 - A8
CAS\
CAS\
DQ0 - DQ3
DQ1 - DQ4
SE\
SE\
RAS\
RAS\
SC
SC
SDQ0 - SDQ3 SDQ1 - SDQ4
TRG\
TR\ /OE\
W\
ME\ /WE\
DSF
DSF
QSF
QSF
Vcc
Vcc
Vss
Vss
GND
NC
DESCRIPTION
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
5V Supply
Ground
Ground (Important: Not Connected to
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.
1
AUSTIN [ AUSTIN SEMICONDUCTOR ]
