W981208AH Ver la hoja de datos (PDF) - Winbond

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componentes Descripción

Fabricante

W981208AH

4M x 8 bit x 4 Banks SDRAM

Winbond 

W981208AH

Features

• 3.3V ± 0.3V power supply

• Up to 133MHz clock frequency

• 4,194,304 words x 4 banks x 8 bits organization

• Auto Refresh and Self Refresh

• CAS latency: 2 and 3

• Burst Length: 1, 2, 4, 8 , and full page

• Burst read, Single Writes Mode

• Byte data controlled by DQM

• Power-Down Mode

• Auto-Precharge and controlled precharge

• 4k refresh cycles / 64ms

• Interface: LVTTL

• Package: TSOP II 54 pin, 400 mil - 0.80

4M x 8 bit x 4 Banks SDRAM

General Description

W981208AH is a high speed synchronous dynamic random access memory (SDRAM) , organized as 4M words x 4 banks x

8 bits. Using pipelined architecture and 0.20um process technology, W981208AH delivers a data bandwidth of up to 133M ( -

75) bytes per second. To fully comply to the personal computer industrial standard, W981208AH is sorted into two speed

grades: -75 and -8H. The -75 is compliant to the PC133 specitication, The -8H is compliant to the PC100/CL2 specification.

Accesses to the SDRAM are burst oriented. Consecutive memory location in one page can be accessed at a burst length of

1, 2, 4, 8 or full page when a bank and row is selected by an ACTIVE command. Column addresses are automatically generated

by the SDRAM internal counter in burst operation. Random column read is also possible by providing its address at each clock

cycle. The multiple bank nature enables interleaving among internal banks to hide the precharging time.

By having a programmable Mode Register, the system can change burst length, latency cycle, interleave or sequential burst

to maximize its performance. W981208AH is ideal for main memory in high performance applications.

Key Parameters

Symbol

Description

tCK Clock Cycle Time

tAC Access Time from CLK

tRP Precharge to Active Command

tRCD Active to Read/Write Command

ICC1 Operation Current ( Single bank )

ICC4 Burst Operation Current

ICC6 Self-Refresh Current

min/max

min

max

min

min

max

max

max

-75 (PC133)

7.5ns

5.4ns

20ns

20ns

85mA

120mA

2mA

-8H (PC100)

8ns

6ns

20ns

20ns

80mA

110mA

2mA

Revision 1.0

Publication Release Date: March, 1999

-1-

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