CDP1823CDX Datasheet

128-word X 8-bit Lsi Static RAM


Features, Applications


The CDP1823 and CDP1823C are by 8-bit CMOS SOS static random-access memories. These memories are compatible with general-purpose microprocessors. The two memories are functionally identical. They differ in that the CDP1823 has a recommended operating voltage range to 10.5V, and the CDP1823C has a recommended operating voltage range to 6.5V. The CDP1823 memory has 8 common data input and data output terminals for direct connection to a bidirectional data bus and is operated from a single voltage supply. Five chipselect inputs are provided to simplify memory-system expansion. In order to enable the CDP1823, the chip-select inputs CS2, CS3 and CS5 require a low input signal, and the chipselect inputs CS1 and CS4 require a high input signal. The MRD signal enables all 8 output drivers when in the low state and should in a high state during a write cycle. After valid data appear at the output, the address inputs may be changed immediately. Output data will be valid until either the MRD signal goes high, the device is deselected, or tAA (access time) after address changes.


Fast Access Time - VDD 450ns - VDD 10V. 250ns Common Data Inputs and Outputs Multiple Chip Select Inputs to Simplify Memory System Expansion


CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com 407-727-9207 | Copyright � Intersil Corporation 1999

OPERATIONAL MODES FUNCTION Read Write Stand-By (Active) Not Selected MRD MWR CS4 CS5 BUS TERMINAL STATE Storage State of Addressed Word Input High-Impedance High Impedance High Impedance High Impedance High Impedance High Impedance High Impedance

Logic 1 = High, Logic 0 = Low, X = Don't Care

DC Supply Voltage Range, (VDD) (All Voltages Referenced to VSS Terminal) to +7V Input Voltage Range, All Inputs. -0.5V to VDD +0.5V DC Input Current, Any One Input.�10mA Operating Temperature Range (TA) Package Type to +125oC Package Type to +85oC

Thermal Resistance (Typical) JA (oC/W) JC (oC/W) PDIP Package. 60 N/A SBDIP Package. 60 17 Maximum Storage Temperature Range to +150oC Maximum Junction Temperature Plastic Package. +150oC Maximum Lead Temperature (During Soldering). 300oC

Recommended Operating Conditions TA = Full Package Temperature Range. For maximum reliability, operating conditions

should be selected so that operation is always within the following ranges: LIMITS CDP1823D PARAMETER Supply Voltage Range Recommended Input Voltage Range MIN 4 VSS MAX 10.5 VDD CDP1823CD MIN 4 VSS MAX 6.5 VDD UNITS V

Operating Current (Note 2) Three-State Output Leakage Current Input Capacitance Output Capacitance NOTES:

1. Typical values are for = +25oC and nominal VDD. 2. Outputs open circuited; Cycle time = 1�s.



Manufacturer information

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