EN27C512 Datasheet | Elite Semiconductor Microelectronics Technology

FEATURES - Fast Read Access Time : -45, -55, -70, and -90ns - Single 5V Power Supply - Programming Voltage +12.75V - Quik Rite TM Programming Algorithm - Typical programming time 20µs - Low Power CMOS Operation - 1µA Standby (Typical) - 30m A Operation (Max.) - CMOS- and TTL-patible I/O - High-Reliability CMOS Technology - Latch-Up Immunity to 100m A from -1V to VCC + 1V - Two-Line Control ( OE & CE ) - Standard Product Identification Code - JEDEC Standard Pinout - 28-pin PDIP - 32-pin PLCC - 28-pin TSOP (Type 1) - mercial and Industrial Temperature Ranges GENERAL DESCRIPTION The EN27C512 is a low-power 512Kbit, 5V-only one-time-programmable (OTP) read-only memory (EPROM). Organized into 64K words with 8 bits per word, it features Quik Rite TM singleaddress location programming, typically at 20 µs per byte. Any byte can be accessed in less than 45ns, eliminating the need for WAIT states in high-performance microprocessor systems. The EN27C512 has separate Output Enable ( OE ) and Chip Enable ( CE ) controls which eliminate bus contention issues. FIGURE 1. PDIP Pin Name A0-A15 DQ0-DQ7 Function Addresses Outputs Chip Enable Output Enable No Connect CE OE 4800 Great America Parkway Ste 202 Santa Clara, CA. 95054 Tel: 408-235-8680 Fax: 408-235-8685 FIGURE 2. TSOP FIGURE 3. PLCC 4800 Great America Parkway Ste 202 Santa Clara, CA. 95054 Tel: 408-235-8680 Fax: 408-235-8685 FIGURE 4. BLOCK DIAGRAM FUNCTIONAL DESCRIPTION THE QUIKRITE PROGRAMMING OF THE EN27C512 When the EN27C512 is delivered, the chip has all 512K bits in the “ONE”, or HIGH state. “ZEROs” are loaded into the EN27C512 through the procedure of programming. The programming mode is entered when 12.75 ± 0.25V is applied to the OE /VPP pin and CE is at VIL. For programming, the data to be programmed is applied with 8 bits in parallel to the data pins. The QUIKRITE programming flowchart in Figure 5 shows Eon’s interactive programming algorithm. The interactive algorithm...