w942508bh Winbond Electronics Corp America, w942508bh Datasheet - Page 3

• Manufacturer Part Number: w942508bh
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
W942508BH is a CMOS Double Data Rate synchronous dynamic random access memory (DDR
SDRAM), organized as 8,388,608 words
process technology, W942508BH delivers a data bandwidth of up to 286M words per second (-7). To
fully comply with the personal computer industrial standard, W942508BH is sorted into three speed
grades: -7, -75 The -7 is compliant to the 143 MHz/CL2.5 or DDR266/CL2 specification, the -75 is
compliant to the DDR266/CL2.5 specification.
All Inputs reference to the positive edge of CLK (except for DQ, DM, and CKE). The timing reference
point for the differential clock is when the CLK and CLK signals cross during a transition. And Write
and Read data are synschronized with the both edges of DQS (Data Strobe).
By having a programmable Mode Register, the system can change burst length, latency cycle,
interleave or sequential burst to maximize its performance. W942508BH is ideal for main memory in
high performance applications.
2. FEATURES
3. KEY PARAMETERS
SYMBOL
2.5V 0.2V Power Supply
Up to 143 MHz Clock Frequency
Double Data Rate architecture; two data transfers per clock cycle
Differential clock inputs (CLK and CLK )
DQS is edge-aligned with data for Read; center-aligned with data for Write
CAS Latency: 2 and 2.5
Burst Length: 2, 4 and 8
Auto Refresh and Self Refresh
Precharged Power Down and Active Power Down
Write Data Mask
Write Latency = 1
8K Refresh cycles / 64 mS
Interface: SSTL-2
Packaged in TSOP II 66-pin, 400 x 875 mil, 0.65mm pin pitch
t
I
I
I
t
t
RAS
DD1
DD4
DD6
RC
CK
Clock Cycle Time
Active to Precharge Command Period
Active to Ref/Active Command Period
Operation Current (Single bank)
Burst Operation Current
Self-Refresh Current
DESCRIPTION
4 banks
CL = 2
CL = 2.5
- 3 -
8 bits. Using pipelined architecture and 0.175 m
MIN./MAX.
Publication Release Date: March 19, 2002
Max.
Max.
Max.
Min.
Min.
Min.
Min.
110 mA
165 mA
W942508BH
7.5 nS
-7
45 nS
65 nS
3 mA
7 nS
Revision A1
110 mA
155 mA
7.5 nS
45 nS
65 nS
-75
3 mA
8 nS