VRAM
SMJ44C251B
MT42C4256
256K X 4 VRAM
256K x 4 DRAM
PIN ASSIGNMENT
(Top View)
with 512K x 4 SAM
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-89497
• MIL-STD-883
28-Pin DIP (C)
(400 MIL)
28-Pin SOJ (DCJ)
28-Pin LCC (EC)
SC
SDQ1
SDQ2
TR\/OE\
DQ1
1
2
3
4
5
6
Vss
SDQ4
SDQ3
Vss
28
27
26
1
2
3
4
5
6
7
8
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
RAS\
A8
A6
A5
A4
28
27
26
25
24
23
22
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
25 SE\
24 DQ4
23 DQ3
DQ2
7
8
ME\/WE\
NC
22
DSF
FEATURES
21 CAS\
21 CAS\
20 QSF
19 A0
9
20
19
18
17
16
15
RAS\
A8
A6
A5
A4
QSF
A0
A1
A2
A3
A7
9
• Class B High-Reliability Processing
10
11
12
13
10
11
12
13
14
• DRAM: 262144 Words × 4 Bits
SAM: 512 Words × 4 Bits
18
17
16
15
A1
A2
A3
A7
• 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
Vcc 14
Vcc
28-Pin ZIP (CZ)
1
3
5
7
DSF
DQ3
SDQ2
Vss
SDQ0
TRG\
DQ1
GND
A8
A5
Vcc
A3
A1
DQ2
SE\
SDQ3
SC
SDQ1
DQ0
W\
RAS\
A8
2
4
6
8
9
10
12
14
16
18
20
22
11
13
15
17
19
21
23
25
27
A4
A7
24 A2
26 A0
28 CAS\
QSF
28-Pin FP (F)
SC
SDQ1
SDQ2
TR\/OE\
DQ1
DQ2
ME\/WE\
NC
1
2
3
4
5
6
7
8
Vss
28
• 512 Selectable Serial-Register Starting
• Split Serial-Data Register for Simplified Real-Time Register Reload
27
26
25
24
23
22
21
20
19
18
17
16
15
SDQ4
SDQ3
SE\
DQ4
DQ3
DSF
CAS\
QSF
A0
A1
A2
A3
A7
OPTIONS
• Timing
MARKING
9
100ns, 30ns/27ns
120ns, 35ns/35ns
-10
-12
RAS\
A8
A6
A5
A4
10
11
12
13
14
• Package(s)
MT Prefix
SMJ Prefix
Vcc
Ceramic SOJ
Ceramic DIP (400 mil)
Ceramic LCC
Ceramic ZIP
Ceramic LCC
DCJ
C
EC
CZ
---
F
---
PIN NAME
(SMJ)
A0 - A8
CAS\
DQ0 - DQ3
SE\
PIN NAME
(MT)
A0 - A8
CAS\
JDM
HMM
SVM
HJM
---
DESCRIPTION
Address Inputs
Column Enable
DQ1 - DQ4 DRAM Data In-Out/Write-Mask Bit
SE\
RAS\
SC
Serial Enable
Row Enable
Serial Data Clock
RAS\
SC
Ceramic Flat Pack
SDQ0 - SDQ3 SDQ1 - SDQ4 Serial Data In-Out
TRG\
W\
DSF
QSF
Vcc
TR\ /OE\
ME\ /WE\
DSF
QSF
Vcc
Transfer Register/Q Output Enable
Write-Mask Select/Write Enable
Special Function Select
Split-Register Activity Status
5V Supply
For more products and information
please visit our web site at
www.micross.com
Vss
Vss
Ground
Ground (Important: Not Connected to
internal Vss, Pin should be left open or
tied to ground.
GND
NC
Micross Components reserves the right to change products or specifications without notice.
SMJ44C251B/MT42C4256
Rev. 0.6 06/10
1
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