AS4C8M16S-7TCN ALLIANCE MEMORY, AS4C8M16S-7TCN Datasheet - Page 14

• Manufacturer Part Number: AS4C8M16S-7TCN
• Description: DRAM 128M SDRAM 8M X 16 143MHz
• Manufacturer: ALLIANCE MEMORY

Specifications of AS4C8M16S-7TCN

• Data Bus Width: 16 bit
• Organization: 8 M x 16
• Package / Case: TSOP II-54
• Memory Size: 128 Mbit
• Maximum Clock Frequency: 143 MHz
• Access Time: 5.4 ns, 6 ns
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Current: 130 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Details

9
10
FEBRUARY 2011
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This bit is used to select the write burst mode. When the A9 bit is "0", the Burst-Read-Burst-Write
mode is selected. When the A9 bit is "1", the Burst-Read-Single-Write mode is selected.
(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.
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
No-Operation command
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
0
1
X
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