M27C256B SGS-Thomson-Microelectronics, M27C256B Datasheet
M27C256B
Available stocks
Related parts for M27C256B
M27C256B Summary of contents
Page 1
... II ALGORITHM) ELECTRONIC SIGNATURE – Manufacturer Code: 20h – Device Code: 8Dh DESCRIPTION The M27C256Bis a 256 KbitEPROM offeredin the two ranges UV (ultra violet erase) and OTP (one time programmable ideally suited for micro- processor systems and is organized as 32,768 by 8 bits. ...
Page 2
... Standby Mode A2 The M27C256B has a standby mode which re- duces the supplycurrentfrom 100 A. The M27C256B is placed in the standby mode by ap- plying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high imped- ance state, independent of the G input. ...
Page 3
... READ line from the system control bus. This ensures that all deselected mem- ory devices are in their low power standby mode and that the output pins are only active when data is desired from a particular memory device. M27C256B Value Unit C C ...
Page 4
... M27C256B Table 5. AC Measurement Conditions Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages Figure 3. AC Testing Input Output Waveform High Speed 3V 0V Standard 2.4V 0.4V (1) Table 6. Capacitance ( MHz ) A Symbol Parameter C Input Capacitance IN C Output Capacitance OUT Note: 1 ...
Page 5
... Min Max Min Max Min Max Min Max and removed simultaneously or after V PP M27C256B 10 Min Max Unit 100 A 100 A –0 ...
Page 6
... Q0-Q7 Programming When delivered (and after each erasure for UV EPROM), all bits of the M27C256B are in the ”1” state. Data is introduced by selectively program- ming ”0”s into the desired bit locations. Although only ”0”s will be programmed, both ”1”s and ”0”s can be present in the data word ...
Page 7
... CC (1) = 12.75V 0.25V) PP Test Condition 2.1mA –1mA OH and removed simultaneously or after V PP (1) = 12.75V 0.25V) PP Test Condition and removed simultaneously or after V PP M27C256B Min Max Unit –0 0.4 V 3.6 V 11.5 12 Min Max ...
Page 8
... Programming of multiple M27C256Bs in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C256B may be common. A TTL low level pulse applied to a M27C256B’s E input, with V at 12.75 V, will program that M27C256B high level E input inhibits the other M27C256Bs from being programmed ...
Page 9
... M27C256B in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C256B exposed to these types 5 C ambient of lighting conditions for extended periods of time suggested that opaque labels be put over the M27C256B window to prevent unintentional era- sure ...
Page 10
... M27C256B ORDERING INFORMATION SCHEME Example: M27C256B -70 X Speed V Tolerance CC ( blank 10 -10 100 ns -12 120 ns -15 150 ns -20 200 ns -25 250 ns Note: 1. High Speed, see AC Characteristics section for further information. For a list of available options (Speed, Package, etc...) or for further informationon any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you ...
Page 11
... M27C256B inches Min Max 0.225 0.020 0.070 0.154 0.200 0.016 0.022 0.046 0.056 0.009 0.012 1.500 0.606 0.622 0.514 0.526 – – – – 0.637 0.721 0.125 ...
Page 12
... M27C256B PDIP28 - 28 pin Plastic DIP, 600 mils width Symb Typ A A1 0.38 A2 3.56 B 0.38 B1 1.52 C 0.20 D 36.83 D2 33.02 E 15.24 E1 13.59 e1 2.54 eA 14.99 eB 15.24 L 3. Drawing is not to scale. 12/15 mm Min Max Typ – 5.08 – 4.06 0.51 – – 0.060 0.30 37.34 – – 1.300 – – 0.600 13.84 – 0.100 – ...
Page 13
... 0.51 (.020) 1.14 (.045) R M27C256B inches Min Max 0.100 0.140 0.060 0.095 – 0.015 0.013 0.021 0.026 0.032 0.485 0.495 0.447 0.455 0.390 0.430 0.585 0.595 0.547 0.555 0.490 0.530 – – 0.000 0.010 – ...
Page 14
... M27C256B TSOP28 - 28 lead Plastic Thin Small Outline 13.4mm Symb Typ 0.10 D 13.10 D1 11.70 E 7.90 e 0. DIE TSOP-c Drawing is not to scale. 14/15 mm Min Max Typ 1.25 0.20 1.05 0.30 0.21 13.70 11.90 8. 0.022 0. 0. inches Min Max 0.039 0.049 0.008 0.037 0.041 ...
Page 15
... STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 1998 STMicroelectronics - All Rights Reserved M27C256B 15/15 ...