AS4C16M16S
Confidential 1 Rev 3 Feb. 2014
16M x 16 bit Synchronous DRAM (SDRAM)
Confidential Advanced (Rev. 1.4, Feb. /2012)
Features
Fast access time from clock: 5.4/5.4 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
Auto Refresh and Self Refresh
8192 refresh cycles/64ms
CKE power down mode
Single +3.3V power supply
Interface: LVTTL
Operating temperature range
- Commercial (0 ~ 70°C)
- Industrial (-40 ~ 85°C)
- Automotive (-40 ~ 105°C)
54-pin 400 mil plastic TSOP II package
54-ball 8.0 x 8.0 x 1.2mm (max) FBGA package
All parts fully ROHS Compliant
Overview
The 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
Access time from CLK (max.)
Table 2. Ordering Information
T : indicates TSOP II package
B : indicates TFBGA package
N : indicates Pb free and Halogen free – ROHS compliant parts
C: Commercial I: Industrial A: Automotive temperatures