AS4C8M16S-7BCN Alliance Memory, AS4C8M16S-7BCN Datasheet - Page 14
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AS4C8M16S-7BCN
Manufacturer Part Number
AS4C8M16S-7BCN
Description
DRAM 128Mb, 3.3V, 143Mhz 8M x 16 SDRAM
Manufacturer
Alliance Memory
Datasheet
1.AS4C8M16S-7BCN.pdf
(53 pages)
Specifications of AS4C8M16S-7BCN
Rohs
yes
Data Bus Width
16 bit
Organization
8 M x 16
Memory Size
128 MB
Maximum Clock Frequency
143 MHz
Access Time
5 ns, 5.4 ns
Supply Voltage - Max
3.6 V
Supply Voltage - Min
3 V
Maximum Operating Current
120 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
9
10
FEBRUARY 2011
•
•
•
mode is selected. When the A9 bit is "1", the Burst-Read-Single-Write mode is selected.
This field specifies the number of clock cycles from the assertion of the Read command to the first
read data. The minimum whole value of CAS# Latency depends on the frequency of CLK. The
minimum whole value satisfying the following formula must be programmed into this field.
t
Table 9. CAS# Latency Field
These two bits are used to enter the test mode and must be programmed to "00" in normal operation.
Table 10. Test Mode Field
This bit is used to select the write burst mode. When the A9 bit is "0", the Burst-Read-Burst-Write
No-Operation command
(RAS# = "H", CAS# = "H", WE# = "H")
Low). This prevents unwanted commands from being registered during idle or wait states.
Burst Stop command
(RAS# = "H", CAS# = "H", WE# = "L")
command is only effective in a read/write burst without the auto precharge function. The terminated
read burst ends after a delay equal to the CAS# latency (refer to the following figure). The
termination of a write burst is shown in the following figure.
CAC
Note: A10 and BA should stay “L” during mode set cycle.
Table 11. Write Burst Length
A9
(min) ≤ CAS# Latency X t
Write Burst Length (A9)
The No-Operation command is used to perform a NOP to the SDRAM which is selected (CS# is
CAS# Latency Field (A6~A4)
Test Mode Field (A8~A7)
0
1
The Burst Stop command is used to terminate either fixed-length or full-page bursts. This
A6
A8
0
0
0
0
1
0
0
1
Burst-Read-Single-Write
Burst-Read-Burst-Write
Write Burst Mode
A5
A7
X
0
0
1
1
X
0
1
CK
A4
X
0
1
0
1
Vendor Use Only
Vendor Use Only
normal mode
Test Mode
14
CAS# Latency
Reserved
Reserved
Reserved
2 clocks
3 clocks
AS4C8M16S