UPD421-2

NEe Microcomputers, Inc. NEe fL PD421 J.L PD421-1 fL PD421-2 fL PD421-3 J.L PD421-5 8K BIT STATIC RAM DESCR IPTION The NEC MPD421 is a very high speed 8192 bit static Random Access Memory organized as 1024 words by 8 bits. Features include a power down mode controlled by the chip select input for an 80% power saving. FEATURES 1024x8-bitOrganization Very Fast Access Time: 150/200/250/300/450 ns Single +5V Power Supply Low Power Standby Mode N-Channel Silicon Gate Process Fully TTL Compatible 6-Device Static Cell Three State Common I/O Compatible with 8108 and Equivalent Devices Available in 22 Pin Ceramic Dual-in-Line Package 11 PIN CONFIGURATION A6 22 Vee As 2 21 A7 A4 3 A3 4 AS 19 A9 A2 5 MPD lS Cs A1 6 421 17 WE AO 1/°1 1/°2 1/°3 GND 7 S 9 10 11 16 I/OS 15 1/°7 14 1/°6 13 1/°5 12 1/°4 PIN NAMES AO-Ag Address Inputs WE Write Enable es Chip Select 1/0,-1/08 Data Input Output VCC Power (+5V) GND Ground 77 ~PD4...