
42
TM
Features
Access Time
- 610ns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . at V
DD
= 5V
- 320ns. . . . . . . . . . . . . . . . . . . . . . . . . . . . at V
DD
= 10V
No Precharge or Clock Required
Description
The CDP1824/3 and CDP1824C/3 types are high-reliability
CMOS 32-word x 8-bit fully static random-access memories
for use in CDP1800-series microprocessor systems. These
parts are compatible with the CDP1802 microprocessor and
will interface directly without additional components.
The CDP1824/3 is fully decoded and does not require a pre-
charge or clocking signal for proper operation. It has com-
mon input and output and is operated from a single voltage
supply. The MRD signal (output disable control) enables the
three-state output drivers, and overrides the MWR signal. A
CS input is provided for memory expansion.
The CDP1824C/3 is functionally identical to the CDP1824/3.
The CDP1824/3 has a recommended operating voltage
range of 4V to 10.5V, and the CDP1824C/3 has an operating
voltage range of 4V to 6.5V.
Ordering Information
5V
10V
PACK-
AGE
TEMP. RANGE
-55
o
C to
+125
o
C
PKG.
NO.
CDP1824CD3 CDP1824D3 SBDIP
D18.3
Pinout
CDP1824/3, CDP1824C/3 (SBDIP)
TOP VIEW
Functional Diagram
10
11
12
13
14
15
16
17
18
9
8
7
6
5
4
3
2
1
V
DD
MRD
CS
BUS0
BUS1
BUS2
BUS3
MWR
BUS4
MA4
MA3
MA2
MA1
MA0
BUS7
BUS5
BUS6
V
SS
MA4
MA3
MA2
MA1
MA0
MWR
CS
V
DD
= 18
V
SS
= 9
BUS
7
BUS
6
BUS
5
BUS
4
BUS
3
BUS
2
BUS
1
BUS
0
MRD
16
5
4
3
2
1
17
15
6
7
8
10
11
12
13
14
ADDRESS
DECODER
32 X 8-BIT
ARRAY
SENSE
AMPL
I/O BUFFERS
OPERATIONAL MODES
FUNCTION
CS
MRD
MWR
DATA PINS STATUS
READ
0
0
X
Output: High/Low Dependent on Data
WRITE
0
1
0
Input: Output Disabled
Not Selected
1
X
X
Output Disabled: High-Impedance State
Standby
0
1
1
Output Disabled: High-Impedance State
Logic 1 = High
Logic 0 = Low
X = Don’t Care
March 1997
CDP1824/3,
CDP1824C/3
High-Reliability CMOS 32-Word x 8-Bit
Static Random-Access Memory
File Number
1717.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Copyright Intersil Americas Inc. 2001. All Rights Reserved