Features: ·High Frequency = 100, 125, 133MHz
·Package:
·219 Plastic Ball Grid Array (PBGA), 21 x 21mm
·Single 3.3V ±0.3V power supply
·Fully Synchronous; all signals registered on pos i tive edge of system clock cycle
·Internal pipelined operation; column address can be changed every clock cycle
·Internal banks for hiding row access/precharge
·Programmable Burst length 1,2,4,8 or full page
·4096 refresh cycles
·Commercial, Industrial and Military Temperature Rang es
·Organized as 4M x 72
·Weight: WEDPN4M72V-XB2X - 2 grams typicalSpecifications
| Parameter |
|
Unit |
Voltage on VCC Supply relative to VSS
Voltage on NC or I/O pins relative to VSS
Operating Temperature TA (Mil)
Operating Temperature TA (Ind)
Storage Temperature, Plastic |
-1 to 4.6
-1 to 4.6
-55 to +125
-40 to +85
-55 to +125 |
V
V
°C
°C
°C |
NOTE:
Stress greater than those listed under "Absolute Maximum Ratings" may cause per ma nent damage to the device. This is a stress rating only and func tion al op er a tion of the device at these or any other conditions greater than those in di cat ed in the operational sections of this specifi cation is not implied. Exposure to ab so lute maximum rating con di tions for extended periods may affect reliability.
DescriptionThe WEDPN4M72V-XB2X is a high-speed CMOS, dynamic random-access ,memory using 5 chips containing 67,108,864 bits. Each chip is internally confi gured as a quad-bank DRAM with a synchronous interface. Each of the chip's 16,777,216-bit banks is organized as 4,096 rows by 256 columns by 16 bits. 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. Ac cess es begin with the registration of an ACTIVE command, which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and row to be accessed (BA0, BA1 select the bank; A0- 11 select the row). The address bits registered coincident with the READ or WRITE command are used to select the starting column location for the burst access.
The WEDPN4M72V-XB2X provides for programmable READ or WRITE burst lengths of 1, 2, 4 or 8 locations, or the full page, with a burst terminate 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 WEDPN4M72V-XB2X uses an internal pipelined architecture to achieve high-speed operation. This architecture is compatible with the 2n rule of prefetch architectures, but WEDPN4M72V-XB2X also allows the column address to be changed on every clock cycle to achieve a high-speed, fully random access. Precharging one bank while accessing one of the other three banks will hide the precharge cycles and provide seamless, high-speed, random-access operation.
WEDPN4M72V-XB2X Data Sheet
