W949D6DB Datasheet, PDF (8/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
SIGNAL NAME TYPE FUNCTION
DESCRIPTION
CKE
Input
Clock Enable
CKE HIGH activates, and CKE LOW deactivates
internal clock signals, and device input buffers and
output drivers. Taking CKE LOW provides
PRECHARGE, POWER DOWN and SELF REFRESH
operation (all banks idle), or ACTIVE POWER DOWN
(row ACTIVE in any bank). CKE is synchronous for all
functions except for SELF REFRESH EXIT, which is
achieved asynchronously. Input buffers, excluding CK,
CK and CKE, are disabled during power down and self
refresh mode which are contrived for low standby power
consumption.
LDQS,UDQS (x16);
DQS0~DQ3 (x32)
I/O
Data Strobe
Output with read data, input with write data. Edge-
aligned with read data, centered with write data. Used to
capture write data.
x16: LDQS: DQ0~DQ7; UDQS: DQ8~DQ15.
x32: DQS0: DQ0~DQ7; DQS1: DQ8~DQ15;
DQS2: DQ16~DQ23; DQS3: DQ24~DQ31.
VDD
Supply Power Power supply for input buffers and internal circuit.
VSS
Supply Ground Ground for input buffers and internal circuit.
VDDQ
Supply
Power for I/O
Buffer
Power supply separated from VDD, used for output
drivers to improve noise.
VSSQ
Supply
Ground for I/O
Buffer
Ground for output drivers.
NC
- No Connect No internal electrical connection is present.
5.2 Addressing Table
Item
Number of banks
Bank address balls
Auto precharge ball
Type
Row addresses
X16
Column addresses
tREFI(µ s)
Row addresses
x32
Column addresses
tREFI(µ s)
512 Mb
4
BA0, BA1
A10/AP
Package
A0-A12
A0-A9
7.8
A0-A12
A0-A8
7.8
Publication Release Date: Oct. 08, 2014
Revision: A01-003
-8-