|Category||Memory => ROM => OTP ROM|
|Description||256 Kbit (32KB X8) uv EPROM And OTP EPROM|
|Company||ST Microelectronics, Inc.|
|Datasheet||Download M27C256B datasheet
± 10% SUPPLY VOLTAGE in READ OPERATION ACCESS TIME: 45ns LOW POWER CONSUMPTION: Active Current 5MHz Standby Current 100µA
PROGRAMMING VOLTAGE: ± 0.25V PROGRAMMING TIME: 100µs/word ELECTRONIC SIGNATURE Manufacturer Code: 20h Device Code: 8Dh
DESCRIPTION The a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized by 8 bits. The FDIP28W (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by following the programming procedure. For applications where the content is programmed only one time and erasure is not required, the M27C256B is offered PDIP28, PLCC32 and x 13.4 mm) packages.
Address Inputs Data Outputs Chip Enable Output Enable Program Supply Voltage Ground Not Connected Internally Don't Use
Symbol TA TBIAS TSTG VIO (2) VCC VA9 (2) VPP Parameter Ambient Operating Temperature (3) Temperature Under Bias Storage Temperature Input or Output Voltage (except A9) Supply Voltage A9 Voltage Program Supply Voltage Value to 14 Unit °C
Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. 2. Minimum DC voltage on Input or Output is 0.5V with possible undershoot to 2.0V for a period less than 20ns. Maximum DC voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns. 3. Depends on range.Mode Read Output Disable Program Verify Program Inhibit Standby Electronic Signature
Q7-Q0 Data Out Hi-Z Data In Data Out Hi-Z Codes
Identifier Manufacturer's Code Device Code A0 VIL VIH 0 1 Hex Data 20h 8Dh
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