UPD8155-2

NEe Microcomputers, Inc. 2048 BIT STATIC MOS RAM WITH 1/0 PORTS AND TIMER NEe fLPD8155 p.PD8155-2 fLPD8156 fLPD8156-2 OESCR IPTION The J.LPDB1 55 and J.LPDB1 56 are J.LPDBOB5A family components having 256 X B Static RAM, 3 programmable I/O ports and a programmable timer. They directly interface to the multiplexed J.LPD80B5A bus with no external logic. The J.LPDB155 has an active low chip enable while the J.LPDB1 56 is active high. FEATURES.256XB·BitStaticRAM Two Programmable B·Bit I/O Ports One Programmable 6·Bit I/O Port Single Power Supplies: +5 Volt, ±10% Directly interfaces to the J.LPDB085A and J.LPD8085A·2 Available in 40 Pin Plastic Packages PIN CONFIGURATION PC3 PC4 TIMER IN RESET PCs TIMER OUT 101M CE/CE* AD WR ALE ADO ADl AD2 AD3 AD4 ADS AD6 AD7 Vss IJPD 8155/ 8156 *I'PD81S5: CE I'PD8l56: CE vcc PC2 PCl PCo PB7 PB6 PBS PB4 PB3 PB2 PBl PBo PA7 PA6 PAS PA4 PA3 PA2 PAl PAo Rev/2 II 537 fLPD8155/8156 The pPD8155 and pPD8156 contain 2048 bits ...