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M29W040B70K6E Datasheet(PDF) 2 Page - STMicroelectronics |
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M29W040B70K6E Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 20 page  M29W040B 2/20 Figure 2. PLCC Connections AI02951 A13 A10 17 A1 A0 DQ0 A7 A4 A3 A2 A6 A5 9 A8 1 A9 DQ7 A14 32 M29W040B A11 G E 25 Figure 3. TSOP Connections A1 A0 DQ0 A7 A4 A3 A2 A6 A5 A13 A10 A8 A9 DQ7 A14 A11 G E DQ5 DQ1 DQ2 DQ3 DQ4 DQ6 A17 W A16 A12 A18 VCC A15 AI02952 M29W040B 8 1 9 16 17 24 25 32 VSS Table 1. Signal Names A0-A18 Address Inputs DQ0-DQ7 Data Inputs/Outputs E Chip Enable G Output Enable W Write Enable VCC Supply Voltage VSS Ground SUMMARY DESCRIPTION The M29W040B is a 4 Mbit (512Kb x8) non-vola- tile memory that can be read, erased and repro- grammed. These operations can be performed using a single low voltage (2.7 to 3.6V) supply. On power-up the memory defaults to its Read mode where it can be read in the same way as a ROM or EPROM. The M29W040B is fully backward com- patible with the M29W040. The memory is divided into blocks that can be erased independently so it is possible to preserve valid data while old data is erased. Each block can be protected independently to prevent accidental Program or Erase commands from modifying the memory. Program and Erase commands are writ- ten to the Command Interface of the memory. An on-chip Program/Erase Controller simplifies the process of programming or erasing the memory by taking care of all of the special operations that are required to update the memory contents. The end of a program or erase operation can be detected and any error conditions identified. The command set required to control the memory is consistent with JEDEC standards. Chip Enable, Output Enable and Write Enable sig- nals control the bus operation of the memory. They allow simple connection to most micropro- cessors, often without additional logic. The memory is offered in TSOP32 (8 x 20mm), TSOP32 (8 x 14mm) and PLCC32 packages and it is supplied with all the bits erased (set to ‘1’). In order to meet environmental requirements, ST offers the M29W040B in ECOPACK® packages. ECOPACK packages are Lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum rat- ings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK speci- fications are available at: www.st.com. |
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