EMC646SP16K

4Mx16 CellularRAM AD-MUX

9

Preliminary

FUNTIONAL DESCRIPTION

In general, 64M CellularRAM devices are high-density alternatives to SRAM and Pseudo SRAM products, popular in low-power,

portable applications. The 64Mb device contains a 67,108,864-bit DRAM core, organized as 4,194,304 addresses by 16 bits.The device

implement a multiplexed address/data bus. This multiplexed configuration supports greater bandwidth through the x16 data bus, yet still

reduces the required signal count. The 64M CellularRAM bus interface supports both asynchronous and burst mode transfers.

POWER-UP INITIALIZATION

64M CellularRAM products include an on-chip voltage sensor used to launch the power-up initialization process. Initialization will

configure the BCR and the RCR with their default settings. VCC and VCCQ must be applied simultaneously. When they reach a stable

level at or above 1.7V, the device will require 150

VccQ and remain HIGH. When initialization is complete, the device is ready for normal operation.

Figure 2: Power-Up Initialization Timing

Vcc

VccQ

Vcc=1.7V

Device Initialization

Device ready for

normal operation