AS4C1M16S Datasheet, PDF (1/53 Pages) Alliance Semiconductor Corporation – 1M x 16 bit Synchronous DRAM

AS4C1M16S
Alliance Confidential
1M x 16 bit Synchronous DRAM (SDRAM)
Features
• Fast access time: 5.4ns
• Fast clock rate: 143 MHz
• Self refresh mode: standard
• Internal pipelined architecture
• 512K word x 16-bit x 2-bank
• Programmable Mode registers
- CAS Latency: 2, or 3
- Burst Length: 1, 2, 4, 8, or full page
- Burst Type: Sequential or Interleaved
- Burst stop function
• Individual byte controlled by LDQM and UDQM
• Auto Refresh and Self Refresh
• 4096 refresh cycles/64ms
• CKE power down mode
• JEDEC standard +3.3V±0.3V power supply
• Interface: LVTTL
• 50-pin 400 mil plastic TSOP II package
-Pb and Halogen Free
Overview
The AS4C1M16S SDRAM is a high-speed
CMOS synchronous DRAM containing 16 Mbits. It is
internally configured as a dual 512K word x 16
DRAM with a synchronous interface (all signals are
registered on the positive edge of the clock signal,
CLK). Each of the 512K x 16 bit banks is organized
as 2048 rows by 256 columns by 16 bits. Read and
write accesses to the SDRAM are burst oriented;
accesses start at a selected location and continue
for a programmed number of locations in a
programmed sequence. Accesses begin with the
registration of a BankActivate command which is
then followed by a Read or Write command.
The AS4C1M16S provides for programmable
Read or Write burst lengths of 1, 2, 4, 8, or full page,
with a burst termination option. An auto precharge
function may be enabled to provide a self-timed row
precharge that is initiated at the end of the burst
sequence. The refresh functions, either Auto or Self
Refresh are easy to use. By having a programmable
mode register, the system can choose the
most suitable modes to maximize its performance.
These devices are well suited for applications
requiring high memory bandwidth and particularly
well suited to high performance PC applications
Table 1. Key Specifications
tCK3
AS4C1M16
Clock Cyc^Sle time(min.)
tRAS Row Active time (min.)
tAC3 Access time from CLK (max.)
tRC
Row Cycle time(min.)
Table 2. Ordering Information
Part Number
Frequency
AS4C1M16S-7TCN 143MHz
T: indicates TSOP II package
N: indicates Pb and Halogen Free
7
7 ns
42 ns
5.4 ns
63 ns
Type
TSOPII