DESCRIPTION

The MR27V3266D is a 32Mbit One Time Programmable Synchronous Read Only Memory whose configuration can be electrically switched between 2,097,152 x16bit(word mode) and 1,048,576 x32bit(double word mode) by the state of the /WORD pin. The MR27V3266D supports high speed synchronous read operations using a single 3.3V power supply.

FEATURES ON READ

- 3.3V power supply

- LVTTL compatible with multiplexed address

- Dual, electrically switchable configurations

  2M x16(word mode) / 1M x32(double word mode)

- All inputs are sampled at the rising edge of the system clock

- High speed read operation

     66MHz : CAS Latency=5

                 tRCDmin=2

                 Burst Length (4, 8)

                 Data scramble (sequential, interleave)

     50MHz : CAS Latency=4, 5

                 tRCDmin=1

                 Burst Length (4, 8)

                 Data scramble (sequential, interleave)

- DQM for data out masking

- No Precharge operation is required. No Refresh operation is required.

- No power on sequence is required.

   Mode register is automatically initialized to the default state after power on.

   "Row Active" command to read data is applicable as the first command just after power on.

- Single Bank operation

- Package : TSOP II 86-P-400-0.50-K

FEATURES ON PROGRAMMING

- 9.75V programming Power supply

- Programming algorithm is compatible with conventional asynchronous 32M OTP.

   MR27V3266D can be programmed with conventional EPROM programmers.

      Synchronous Burst read or Static Programming Operation are selected by the state of STO pin.

         High STO level enables full static programming. (Program, Program Verify, asynchronous Read)

         Low STO level enables synchronous burst read.

      Exclusive 86pin socket adapters are available from OKI to support programming requirements.

         The socket adapter is used on a 48DIP socket on the programmer.

         The socket adapter is designed with the STO pin connected to VCC in order to program MR27V3266D as conventional 32M OTP.

      EPROM programmer must have the proper algorithm for 32M OTP.

         *Device damage can occur if improper algorithm is used.

- High speed programming

      10µs programming pulse per word allows high speed programming.