UPD446

NEe Microcomputers, Inc. 2048 x 8 BIT STATIC CMOS RAM NEe f'PD446 f'PD446-1 pPD446-2 ~rn~[~~~ ~illrnW DESC RIPTION The IlPD446 is a high speed, low power, 2048 word by 8 bit static CMOS RAM fabricated using an advanced silicon gate CMOS technology. A unique circuitry technique makes the IlPD446 a very low operating power device which requires no clock or refreshing to operate. Minimum standby power current is drawn by this device when CE equals VCC independently of the other input levels. Data retention is guaranteed at a power supply voltage as low as 2V. The IlPD446 is packaged in a standard 24'pin dual-in-line package and is plug-in compatible with 16K EPROMs. FEATU RES Single +5V Supply Fully Static Operation - No Clock or Refreshing required TTL Compatible - All Inputs and Outputs Common I/O Using Three-State Output OE Eliminates Need for External Bus Buffers Max Access/Min Cycle Times Down to 120 ns Low Power Dissipation, 45 mA Max Activel100 IlA Max Standby/ 10 IlA Max Data Retention Data Retention Voltage - 2V Min Standard 24-Pin Plastic and Ceramic Packages Plug-in Compatible with 16K EPROMs II PIN ·CONFIGURATION 2 4 5 A2 6 Al AD S 1/01 9 1102 IlPD 446 24 VCC 23 AS 22 A9 21 WE 20 OE 19 Al0 1B CE 17 1/08 16 1107 15 1106 14 1105 13 1104 PIN NAMES AO-Al0 'WE Address Inputs Write Enable DE CE 1/01-I/OB VCC Output Enable Chip Enable Data InputlOutput Power (+5V) GND Ground TRUTH TABLE CE OE WE MODE 110 ICC H X X NOT SELECTED HZ...