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WCMS0808U1X Datasheet, PDF (1/10 Pages) Weida Semiconductor, Inc. – 32K x 8 Static RAM
S0808U1X
WCMS0808U1X
Features
• Low voltage range:
— 2.7V − 3.6V
• Low active power and standby power
• Easy memory expansion with CE and OE features
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
• CMOS for optimum speed/power
Functional Description
The WCMS0808U1X is composed of a high-performance
CMOS static RAM organized as 32K words by 8 bits. Easy
memory expansion is provided by an active LOW chip enable
(CE) and active LOW output enable (OE) and three-state driv-
ers. These devices have an automatic power-down feature,
Logic Block Diagram
A10
A9
A8
A7
A6
A5
A4
A3
A2
CE
WE
OE
INPUTBUFFER
512x512
ARRAY
COLUMN
DECODER
POWER
DOWN
32K x 8 Static RAM
reducing the power consumption by over 99% when deselect-
ed. The WCMS0808U1X is available in the 450-mil-wide
(300-mil body width) narrow SOIC and TSOP.
An active LOW write enable signal (WE) controls the writ-
ing/reading operation of the memory. When CE and WE inputs
are both LOW, data on the eight data input/output pins (I/O0
through I/O7) is written into the memory location addressed by
the address present on the address pins (A0 through A14).
Reading the device is accomplished by selecting the device
and enabling the outputs, CE and OE active LOW, while WE
remains inactive or HIGH. Under these conditions, the con-
tents of the location addressed by the information on address
pins are present on the eight data input/output pins.
The input/output pins remain in a high-impedance state unless
the chip is selected, outputs are enabled, and write enable
(WE) is HIGH.
Pin Configurations
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7 OE 22
A1
23
A2
24
A3
25
A4
26
WE
27
VCC
28
A5
1
A6
2
A7
3
A8
4
A9
5
A10
6
A11
7
Narrow
SOIC
Top View
A5 1
A6 2
A7 3
A8 4
A9 5
A10 6
A11 7
A12 8
A13 9
A14 10
I/O0 11
I/O1 12
I/O2 13
GND 14
28 VCC
27 WE
26 A4
25 A3
24 A2
23 A1
22 OE
21 A0
20 CE
19
18
I/O7
I/O6
17 I/O5
16 I/O4
15 I/O3
TSOP I
Top View
(not to scale)
21 A0
20 CE
19 I/O7
18 I/O6
17 I/O5
16 I/O4
15 I/O3
14 GND
13 I/O2
12 I/O1
11 I/O0
10 A14
9 A13
8 A12
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