emc646sp16ak Emlsi Inc., emc646sp16ak Datasheet - Page 9

• Manufacturer Part Number: emc646sp16ak
• Description: 4mx16 Bit Cellularram
• Manufacturer: Emlsi Inc.

Functional Description
In general, 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
implements the same high-speed bus interface found on burst mode Flash products. The CellularRAM bus interface supports both
asynchronous and burst mode transfers. Page mode accesses are also included as a bandwidth-enhancing extension to the
asynchronous read protocol.
Power-Up Initialization
64Mb 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. (See Figure 16 and 20) Vcc and VccQ must be applied simultaneously.
When they reach a stable level at or above 1.7V, the device will require 150µs to complete its self-initialization process. During the
initialization period, CE# should 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
t
PU
≥ 150µs
9
Device ready for
normal operation
EMC646SP16AK
4Mx16 CellularRAM