WCFS1008C3E Datasheet, PDF (1/8 Pages) Weida Semiconductor, Inc. – 128K x 8 Static RAM

S1008C3E
1008C9E
WCFS1008C3E
WCFS1008C9E
Features
• High speed
— t_AA = 15 ns
• 2.0V Data Retention
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE₁, CE₂, and OE options
Functional Description
The WCF1008C3E and WCFS1008C9E are high-perfor-
mance CMOS static RAM organized as 131,072 words by 8
bits. Easy memory expansion is provided by an active LOW
Chip Enable (CE₁), an active HIGH Chip Enable (CE₂), an
active LOW Output Enable (OE), and three-state drivers. Writ-
ing to the device is accomplished by taking Chip Enable One
(CE₁) and Write Enable (WE) inputs LOW and Chip Enable
Logic Block Diagram
128K x 8 Static RAM
Two (CE₂) input HIGH. Data on the eight I/O pins (I/O₀ through
I/O₇) is then written into the location specified on the address
pins (A₀ through A₁₆).
Reading from the device is accomplished by taking Chip En-
able One (CE₁) and Output Enable (OE) LOW while forcing
Write Enable (WE) and Chip Enable Two (CE₂) HIGH. Under
these conditions, the contents of the memory location speci-
fied by the address pins will appear on the I/O pins.
The eight input/output pins (I/O₀ through I/O₇) are placed in a
high-impedance state when the device is deselected (CE₁
HIGH or CE₂ LOW), the outputs are disabled (OE HIGH), or
during a write operation (CE₁ LOW, CE₂ HIGH, and WE LOW).
The WCFS1008C3E is available in standard 300-mil-wide
SOJ. The WCFS1008C9E is available in standard 400-mil-
wide SOJ. The WCFS1008C3E and WCFS1008C9E are func-
tionally equivalent in all other respects..
INPUT BUFFER
A₀
A₁
A₂
A₃
A₄
A₅
A₆
512 x 256 x 8
ARRAY
A₇
A₈
CE₁
CE₂
COLUMN
DECODER
WE
OE
Selection Guide
POWER
DOWN
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
Pin Configurations
SOJ
Top View
NC 1
A_{16 2}
A₁₄ 3
A₁₂ 4
A₇ 5
A₆ 6
A_{5 7}
A₄ 8
A₃ 9
A₂ 10
A_{1 11}
A₀ 12
I/O_{0 13}
I/O_{1 14}
I/O_{2 15}
GND ₁₆
32 VCC
31 A₁₅
30 CE₂
29 WE
28 _A13
27 _A8
26 _A9
25 _A11
24 _OE
23 A₁₀
22 CE₁
21 I/O7
20 ^I/O6
19 ^I/O5
18 ^I/O4
17 I/O3
WCFS1008C3E WCFS1008C9E 15ns
15
80
10
Revised April 12, 2002