K4E661612D,K4E641612D
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(Normal 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
• Part Identification
• 2 CAS Byte/Word Read/Write operation
- K4E661612D-TC/L(3.3V, 8K Ref.)
- K4E641612D-TC/L(3.3V, 4K Ref.)
• 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
• Active Power Dissipation
• Early Write or output enable controlled write
Unit : mW
Speed
8K
-45
324
468
-50
288
432
-60
252
• JEDEC Standard pinout
4K
396
• Available in Plastic TSOP(II) packages
• +3.3V±0.3V power supply
• Refresh Cycles
Refresh
cycle
K4E661612D*
8K
K4E641612D
4K
FUNCTIONAL BLOCK DIAGRAM
Refresh time
Normal
L-ver
64ms
128ms
RAS
UCAS
LCAS
W
* Access mode & RAS only refresh mode
: 8K cycle/64ms(Normal), 8K cycle/128ms(L-ver.)
CAS-before-RAS & Hidden refresh mode
: 4K cycle/64ms(Normal), 4K cycle/128ms(L-ver.)
Refresh Timer
Refresh Counter
tRAC
tCAC
tRC
tHPC
-45
45ns
12ns
74ns
17ns
-50
50ns
13ns
84ns
20ns
-60
60ns
15ns
104ns
25ns
A0~A12
(A0~A11)*1
Col. Address Buffer
Lower
Data in
Buffer
Row Decoder
Memory Array
4,194,304 x 16
Cells
Row Address Buffer
A0~A8
(A0~A9)*1
Vcc
Vss
VBB Generator
Refresh Control
• Performance Range
Speed
Control
Clocks
Column Decoder
Note) *1 : 4K Refresh
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
