emc643sp16ak Emlsi Inc., emc643sp16ak Datasheet - Page 9

• Manufacturer Part Number: emc643sp16ak
• Description: 4mx16 Bit Cellularram Ad-mux
• Manufacturer: Emlsi Inc.

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 150µs to complete its self-initialization process. Until the end of
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
t
PU
9
Device ready for
normal operation
4Mx16 CellularRAM AD-MUX
EMC643SP16AK
t
PU, CE# should track