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M27C256B-10B1 View Datasheet(PDF) - STMicroelectronics

Part NameM27C256B-10B1 ST-Microelectronics
STMicroelectronics ST-Microelectronics
Description256 Kbit (32Kb × 8) UV EPROM and OTP EPROM
M27C256B-10B1 Datasheet PDF : 24 Pages
First Prev 21 22 23 24
Revision history
Revision history
Table 16. Document revision history
Revision Details
July 1998
1.0 First Issue
20-Sep-2000 1.1 AN620 Reference removed
29-Nov-2000 1.2 PLCC codification changed (Table 15.)
02-Apr-2001 1.3 FDIP28W mechanical dimensions changed (Table 12.)
Package mechanical data clarified for PDIP28 (Table 13.),
PLCC32 (Table 14., Figure 11.) and TSOP28 (Table 15., Figure 13.)
t(s) Document converted to new template (sections added, information
c 18-May-2006
TSOP28 package removed. Packages are ECOPACK® compliant. X
Obsolete Product(s) - Obsolete Produ option removed from Table 15: Ordering information scheme.
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Summary description
The M27C256B is 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 as 32,768 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 in PDIP28 and PLCC32 packages.
LButtonIn order to meet environmental requirements, ST offers the M27C256B 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 ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at:

Feature summary
■ 5V ± 10% supply voltage in Read operation
■ Access time: 45ns
■ Low power consumption:
   – Active Current 30mA at 5MHz
   – Standby Current 100µA
■ Programming voltage: 12.75V ± 0.25V
■ Programming time: 100µs/Word
■ Electronic signature
   – Manufacturer Code: 20h
   – Device Code: 8Dh
■ ECOPACK® packages available

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