WCMA1008C1X Datasheet, PDF (1/11 Pages) Weida Semiconductor, Inc. – 128K x 8 Static RAM

WCMA1008C1X
Features
• Voltage Range
— 4.5V–5.5V
• Low active power
— Typical active current: 6 mA @ f = f_max (70 ns speed)
• Low standby current
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE₁, CE₂, and OE fea-
tures
• CMOS for optimum speed/power
Functional Description
The WCMA1008C1X is a high-performance CMOS static
RAM organized as 128K words by 8 bits. Easy memory expan-
sion is provided by an active LOW Chip Enable (CE₁), an ac-
tive HIGH Chip Enable (CE₂), an active LOW Output Enable
Logic Block Diagram
128K x 8 Static RAM
(OE), and three-state drivers. This device has an automatic
power-down feature that reduces power consumption by more
than 75% when deselected.
Writing to the device is accomplished by taking Chip Enable 1
(CE₁) and Write Enable (WE) inputs LOW and Chip Enable 2
(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 1 (CE₁) and Output Enable (OE) LOW while forcing Write
Enable (WE) and Chip Enable 2 (CE₂) HIGH. Under these
conditions, the contents of the memory location specified 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 WCMA1008C1X is available in a standard 32-pin
450-mil-wide body width SOIC and 32-pin TSOP type I.
A0
A1
A2
A3
A4
A5
A6
A7
A8
CCEE21
WE
OE
INPUT BUFFER
512x 256x 8
ARRAY
COLUMN
DECODER
POWER
DOWN
I/O ₀
I/O ₁
I/O ₂
I/O ₃
I/O ₄
I/O ₅
I/O ₆
I/O ₇
Pin Configuration
Top View
SOIC
A₁₇ 1
A_{16 2}
A₁₄ 3
A_{12 4}
A₇ 5
A_{6 6}
A_{5 7}
A₄ 8
A_{3 9}
A_{2 10}
A_{1 11}
A₀ 12
I/O_{0 13}
I/O_{1 14}
I/O_{2 15}
GND ₁₆
32 V_CC
31 A₁₅
30 A₁₈
29 WE
28 _A13
27 _A8
26
25
A₉
A₁₁
24 _OE
23 A₁₀
22 CE
21 I/O7
20 ^I/O₆
19 ^I/O5
18 ^I/O4
17 I/O₃
AAAA₁₁₁₃₈₉
WE
1
2
3
4
5
CAE₁₅₂
VN_CCC
6
7
8
9
A₁₆ 10
AAA₁₁₄₂₇
11
12
13
A₆
AA₄₅
14
15
16
TSOP I
Top View
(not to scale)
32 OE
31
30
29
28
27
AII_{ICI////OOOO1E607561}
26
25
24
GII//OON⁴³D
23
22
21
20
19
18
17
IIIAAAA///OOO_{1032 210}
April 5, 2002