KM416C254D, KM416V254D
CMOS DRAM
256K x 16Bit CMOS Dynamic RAM with Extended Data Out
DESCRIPTION
This is a family of 262,144 x 16 bit Extended Data Out Mode CMOS DRAMs. Extended Data Out Mode offers high speed random access
of memory cells within the same row. Power supply voltage(+5.0V or +3.3V), Access time (-5,-6 or -7), power consumption(Normal or
Low power) and package type(SOJ or TSOP-II) are optional features of this family. All of this family have CAS-before-RAS refresh, RASonly refresh and Hidden refresh capabilities. Furthermore, Self-refresh operation is available in L-version. This 256Kx16 EDO Mode
DRAM family is fabricated using Samsung′s advanced CMOS process to realize high band-width, low power consumption and high reliability. It may be used as graphic memory unit for microcomputer, personal computer and portable machines.
• Extended Data Out Mode operation
FEATURES
• 2 CAS Byte/Wrod Read/Write operation
• Part Identification
• CAS-before-RAS refresh capability
• RAS-only and Hidden refresh capability
- KM416C254D/DL (5V, 512 Ref.)
- KM416V254D/DL (3.3V, 512 Ref.)
• Self-refresh capability (L-ver only)
• TTL(5V)/LVTTL(3.3V) compatible inputs and outputs
• Early Write or output enable controlled write
• Active Power Dissipation
• JEDEC Standard pinout
Unit : mW
Speed
3.3V(512 Ref.)
-5
-
605
-6
255
495
-7
235
• Available in 40-pin SOJ 400mil and 44(40)-pin
5V(512 Ref.)
440
packages
• Triple +5V±10% power supply (5V product)
• Triple +3.3V±0.3V power supply (3.3V product)
FUNCTIONAL BLOCK DIAGRAM
• Refresh Cycles
VCC
C254D
5V
V254D
Refresh
cycle
Refresh period
3.3V
Normal
512
8ms
L-ver
128ms
RAS
UCAS
LCAS
W
Control
Clocks
Refresh Timer
Refresh Control
tRAC
tCAC
tRC
tHPC
Remark
-5
50ns
15ns
84ns
20ns
5V only
-6
60ns
15ns
104ns
25ns
5V/3.3V
-7
70ns
20ns
124ns
30ns
5V/3.3V
Refresh Counter
Memory Array
262,144 x16
Cells
Row Address Buffer
A0~A8
Col. Address Buffer
Lower
Data in
Buffer
Row Decoder
• Performance Range
Speed
Vcc
Vss
VBB Generator
Column Decoder
SAMSUNG ELECTRONICS CO., LTD. reserves the right to
change products and specifications without notice.
Sense Amps & I/O
Part
NO.
Lower
Data out
Buffer
Upper
Data in
Buffer
Upper
Data out
Buffer
DQ0
to
DQ7
OE
DQ8
to
DQ15
