Datasheet
AS4C16M16SA-C&I
Confidential
1
Rev. 3.0 Mar. /2015
256M – (16Mx16bit) Synchronous DRAM (SDRAM)
Confidential Advanced(Rev. 3.0, Mar. /2015)
Features
Fast access time from clock: 5/5.4 ns
Fast clock rate: 166/143 MHz
Fully synchronous operation
Internal pipelined architecture
4M word x 16-bit x 4-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
Operating temperature range
- Commercial (0 ~ 70°C)
- Industrial (-40 ~ 85°C)
Auto Refresh and Self Refresh
8192 refresh cycles/64ms
CKE power down mode
Single +3.3V
±
0.3V power supply
Interface: LVTTL
54-pin 400 mil plastic TSOP II package
54-ball 8.0 x 8.0 x 1.2mm (max) FBGA package
-
All parts ROHS are compliant
Overview
T
he 256Mb SDRAM is a high-speed CMOS
synchronous DRAM containing 256 Mbits. It is
internally configured as 4 Banks of 4M word x 16
DRAM with a synchronous interface (all signals are
registered on the positive edge of the clock signal,
CLK). 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 SDRAM 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
AS4C16M16SA
-6/7
tCK3
Clock Cycle time (min.)
6/7 ns
tAC3
Access time from CLK (max.)
5/5.4 ns
tRAS
Row Active time (min.)
42/42 ns
tRC
Row Cycle time (min.)
60/63 ns
Table 2. Ordering Information
Part Number
Frequency
Package
Temperature
Temp Range
AS4C16M16SA-7TCN
143 MHz
54 pin TSOP II
Commercial
0~70
℃
AS4C16M16SA-6TCN
166 MHz
54 pin TSOP II
Commercial
0~70
℃
AS4C16M16SA-6TIN
166 MHz
54 pin TSOP II
Industrial
-40~85
℃
AS4C16M16SA-7BCN
143 MHz
54 ball TFBGA
Commercial
0~70
℃
AS4C16M16SA-6BIN
166 MHz
54 ball TFBGA
Industrial
-40~85
℃
T : indicates TSOP II package
B : indicates TFBGA package
C: Commercial I: Industrial
N : indicates Pb free and Halogen free