M65KG256AB datasheet(11/51 Pages) STMICROELECTRONICS

Part #	M65KG256AB

Description	256Mbit (4 Banks x 4M x 16) 1.8V Supply, 133MHz Clock Rate, DDR Low Power SDRAM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 51 page

M65KG256AB

2 Signal descriptions

11/51

2.13

VDDQ Supply Voltage

VDDQ provides the power supply to the I/O pins and enables all Outputs to be powered

independently of VDD. VDDQ can be tied to VDD or can use a separate supply. It is

recommended to power-up and power-down VDD and VDDQ together to avoid certain conditions

that would result in data corruption.

2.14

VSS Ground

Ground, VSS, is the reference for the core power supply. It must be connected to the system

ground.

2.15

VSSQ Ground

VSSQ ground is the reference for the input/output circuitry driven by VDDQ. VSSQ must be

connected to VSS.

Note: Each device in a system should have VDD and VDDQ decoupled with a 0.1µF ceramic

capacitor close to the pin (high frequency, inherently low inductance capacitors should be as

close as possible to the package).

Table 2.

Bank Selection using BA0-BA1

Selected Bank

BA0

BA1

Bank A

VIL

Bank B

VIH

VIL

Bank C

VIL

VIH

Bank D

VIH

M65KG256AB Datasheet(PDF) 11 Page - STMicroelectronics