K4F660812C,K4F640812C
CMOS DRAM
8M x 8bit CMOS Dynamic RAM with Fast Page Mode
DESCRIPTION
This is a family of 8,388,608 x 8 bit Fast Page Mode CMOS DRAMs. Fast Page 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 8Mx8 Fast Page Mode DRAM family is fabricated using Samsung′s
advanced CMOS process to realize high band-width, low power consumption and high reliability.
FEATURES
• Fast Page Mode operation
• Part Identification
- K4F660812C-JC/L(3.3V, 8K Ref., SOJ)
- K4F640812C-JC/L(3.3V, 4K Ref., SOJ)
- K4F660812C-TC/L(3.3V, 8K Ref., TSOP)
- K4F640812C-TC/L(3.3V, 4K Ref., TSOP)
• CAS-before-RAS refresh capability
• RAS-only and Hidden refresh capability
• Self-refresh capability (L-ver only)
• Fast parallel test mode capability
• LVTTL(3.3V) compatible inputs and outputs
• Early Write or output enable controlled write
• Active Power Dissipation
Unit : mW
• JEDEC Standard pinout
Speed
8K
4K
• Available in Plastic SOJ and TSOP(II) packages
-45
324
432
• +3.3V±0.3V power supply
-50
288
396
-60
252
360
• Refresh Cycles
Refresh
cycle
K4F660812C*
8K
K4F640812C
4K
FUNCTIONAL BLOCK DIAGRAM
Refresh time
Normal
L-ver
64ms
128ms
RAS
CAS
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.)
Control
Clocks
Refresh Timer
Refresh Counter
Speed
tRAC
tCAC
tRC
tPC
-45
45ns
12ns
80ns
31ns
-50
50ns
13ns
90ns
35ns
-60
60ns
15ns
110ns
40ns
Row Decoder
Refresh Control
• Performance Range
A0~A12
(A0~A11)*1
Col. Address Buffer
Memory Array
8,388,608 x 8
Cells
Row Address Buffer
A0~A9
(A0~A10)*1
Vcc
Vss
VBB Generator
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.
Data in
Buffer
DQ0
to
DQ7
Data out
Buffer
OE
