K4E661612C,K4E641612C
CMOS DRAM
4M x 16bit CMOS Dynamic RAM with Extended Data Out
DESCRIPTION
This is a family of 4,194,304 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. Refresh cycle(4K Ref. or 8K Ref.), access time (-45, -50 or -60), power consumption(Nor-
mal or Low power) are optional features of this family. All of this family have CAS-before-RAS refresh, RAS-only refresh and Hidden
refresh capabilities. Furthermore, Self-refresh operation is available in L-version. This 4Mx16 EDO Mode DRAM family is fabricated
using Samsung¢s advanced CMOS process to realize high band-width, low power consumption and high reliability.
FEATURES
• Extended Data Out Mode operation
• 2 CAS Byte/Word Read/Write operation
• CAS-before-RAS refresh capability
• RAS-only and Hidden refresh capability
• Fast parallel test mode capability
• Self-refresh capability (L-ver only)
• LVTTL(3.3V) compatible inputs and outputs
• Early Write or output enable controlled write
• JEDEC Standard pinout
• Part Identification
- K4E661612C-TC/L(3.3V, 8K Ref.)
- K4E641612C-TC/L(3.3V, 4K Ref.)
• ActivePowerDissipation
Unit : mW
4K
Speed
-45
8K
• Available in Plastic TSOP(II) packages
• +3.3V±0.3V power supply
324
288
252
468
-50
432
-60
396
• Refresh Cycles
FUNCTIONAL BLOCK DIAGRAM
Part
NO.
Refresh
cycle
Refresh time
Normal
L-ver
RAS
UCAS
LCAS
W
K4E661612C*
K4E641612C
8K
4K
Vcc
Vss
64ms
128ms
Control
Clocks
VBB Generator
* Access mode & RAS only refresh mode
: 8K cycle/64ms(Normal), 8K cycle/128ms(L-ver.)
CAS-before-RAS & Hidden refresh mode
Lower
Data in
Buffer
DQ0
to
Row Decoder
Refresh Timer
DQ7
Lower
Data out
Buffer
: 4K cycle/64ms(Normal), 4K cycle/128ms(L-ver.)
Refresh Control
Memory Array
OE
4,194,304 x 16
Cells
Refresh Counter
Upper
Data in
Buffer
• Performance Range
DQ8
to
DQ15
Speed
Row Address Buffer
Col. Address Buffer
tRAC
45ns
50ns
60ns
tCAC
12ns
13ns
15ns
tRC
74ns
84ns
104ns
tHPC
17ns
20ns
25ns
A0~A12
(A0~A11)*1
Upper
Data out
Buffer
-45
-50
-60
A0~A8
(A0~A9)*1
Column Decoder
Note) *1 : 4K Refresh
SAMSUNG ELECTRONICS CO., LTD. reserves the right to
change products and specifications without notice.