Description
The CDP1822 and CDP1822C are 256-word by 4-bit static random-access memories designed for use in memory systems where high speed, low operating current, and simplicity in use are desirable. The CDP1822 features high speed and a wide operating voltage range. Both types have separate data inputs and outputs and utilize single power supplies of 4V to 6.5V for the CDP1822C and 4V to 10.5V for the CDP1822. Two Chip-Select inputs are provided to simplify system expansion. An Output Disable control provides Wire-OR capability and is also useful in common Input/Output systems. The Output Disable input allows these RAMs to be used in common data Input/Output systems by forcing the output into a high-impedance state during a write operation independent of the Chip-Select input condition. The output assumes a high-impedance state when the Output Disable is at high level or when the chip is deselected by CS1 and/or CS2. The high noise immunity of the CMOS technology is preserved in this design. For TTL interfacing at 5V operation, excellent system noise margin is preserved by using an external pull-up resistor at each input.
Rca Cdp1822Ce IC 256-Word x 4-Bit LSI Static RAM
Features
· Low Operating Current – VDD = 5V, Cycle Time 1µs . . . . . . . . . . . . . . . . . . 8mA · Industry Standard Pinout · Two Chip-Select Inputs-Simple Memory Expansion · Memory Retention for Standby Battery Voltage of 2V Minimum · Output-Disable for Common I/O Systems · Three-State Data Output for Bus-Oriented Systems · Separate Data Inputs and Outputs
Ordering Information
5V CDP1822CE 10V CDP1822E PACKAGE PDIP Burn-In SBDIP Burn-In -40oC to +85oC TEMP. RANGE -40oC to +85oC PKG. NO.
E22.4 E22.4 D22.4A D22.4A
CDP1822CEX CDP1822EX CDP1822CD CDP1822CDX CDP1822D –
Pinout
CDP1822, CDP1822C (PDIP, SBDIP) TOP VIEW
A3 1 A2 2 A1 3 A0 4 A5 5 A6 6 A7 7 VSS 8 DI1 9 DO1 10 DI2 11 22 VDD 21 A4 20 R/W 19 CS1 18 O. D. 17 CS2 16 DO4 15 DI4 14 DO3 13 DI3 12 DO2
OPERATIONAL MODES INPUTS CHIP SELECT 1 (CS1) 0 0 0 CHIP SELECT 2 (CS2) 1 1 1 OUTPUT READ/ DISABLE WRITE (OD) (R/W) 0 0 1 1 0 0
MODE Read Write Write
OUTPUT Read Data In High Impedance High Impedance High Impedance High Impedance
Manufacturer:Intersil
Datasheet:CDP1822CE.pdf
