M28256 STMICROELECTRONICS | Alldatasheet
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256 Kbit (32Kb x8) Parallel EEPROM
with Software Data Protection PRELIMINARY DATA January 1999 1/21 This is preliminaryinformation on a new product now in developmentor undergoing evaluation .Detail s are subject to change without notice. AI01885 A0-A14 W DQ0-DQ7 VCC M28256 G E VSS Figure 1. Logic Diagram Table 1. Signal Names
DESCRIPTION
The M28256and M28256-Ware 32K x8 low power ParallelEEPROMfabricatedwith STMicroelectron- ics proprietary double polysilicon CMOS technol- ogy. TSOP28 (NS) 8 x13.4mm SO28 (MS) 300 mils
W A11 G E DQ5DQ1 DQ2 DQ3VSS DQ4 DQ6 A12 A14 V CC AI01886 M282568 Figure 2A. DIP Pin Connections AI01887 A13 A10 DQ4 NC DQ0 DQ1 DQ2 DU DQ3 W
1 A14
G E VSS Figure 2B. LCC Pin Connections Warning:NC = Not Connected, DU = Don’t Use. DQ0 A11 DQ7 G E DQ5 DQ1 DQ2 DQ3 DQ4 DQ6 A13 W A12 A14 VCC AI01889 M2825628 VSS A10 Figure 2D. TSOP Pin Connections DQ0 DQ1 A10 E A13 DQ7 G DQ5 VCC DQ4 W A14 AI01888 M282568 DQ2 VSS DQ6
23 A11
Figure 2C. SO Pin Connections M28256
Table 2. Absolute Maximum Ratings(1) Figure 3. Block Diagram
Table 3. Operating Modes(1) dissipation and requires a 5V or 3V power supply. using the standard JEDEC algorithm. Enable is high, power consumption is reduced. from the memory through the I/O pins. the writing of data to the memory. impedance when either G or E is high. write can be initiated by any byte write operation.
port bits during programming cycle only. which running/overflowstatus is available on DQ5. may occur due to uncontrolledbus conditions. any effect on the memory contents. adressing different bytes in different pages). set, and data is to be written. Figure 4. Status Bit Assignment
Table 4. AC Measurement Conditions
0.5 VCC
Figure 7. AC Testing Input Output Waveforms Figure 8. AC Testing Equivalent Load Circuit Note: 1. Sampled only, not 100% tested. Table 5. Capacitance(1) (TA =2 5°C, f = 1 MHz ) Note: 1. All I/O’s open circuit. Table 6. Read Mode DC Characteristics for M28256
Note: 1. Sampled only, not 100% tested. Table 7. Power Up Timing for M28256(1) Note: 1. All I/O’s open circuit. Table 8. Read Mode DC Characteristics for M28256-W Note: 1. Sampled only, not 100% tested. Table 9. Power Up Timing for M28256-W(1)
Note:1. Output Hi-Z is defined as the point at which data is no longer driven. Table 10. Read Mode AC Characteristics Note:1. Output Hi-Z is defined as the point at which data is no longer driven. Table 11. Read Mode AC Characteristics
Note: 1. Characterized only but not testedin production . Table 12. Write Mode AC Characteristics
Note: 1. Characterized only but not testedin production . Table 13. Write Mode AC Characteristics
Figure 15. Toggle Bit Waveform Sequence Note:1. First Toggle bit is forced to ’0’.
ORDERING INFORMATION SCHEME Speed 90 (1) 90ns 12 120ns 15 150ns 20 200ns (2) 250ns Operating Voltage blank 4.5V to 5.5V W 2.7V to 3.6V Package BS PDIP28 KA PLCC32 MS SO28 300 mils NS TSOP28 8 x 13.4mm Temperature Range (3) 0t o7 0°C 6 –40 to 85 °C Option T Tape & Reel Packing Example: M28256 – 15 W KA 6 T Notes:1. Not available for ”W” operating voltage. 2. Available for ”W” operating voltage only. 3. Temperature Range on request only.Devices are shipped from the factory with the memory content set at all ”1’s” (FFh). For a list of availableoptions(Speed, Package,etc...)or for furtherinformationon any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you. M28256
A L B1 B e1 D S E1 E N C α eA eBD2 Symb mm inches Typ Min Max Typ Min Max A – 5.08 – 0.200 A1 0.38 – 0.015 – A2 3.56 4.06 0.140 0.160 B 0.38 0.51 0.015 0.020 C 0.20 0.30 0.008 0.012 D 36.83 37.34 1.450 1.470 E1 13.59 13.84 0.535 0.545 eB 15.24 17.78 0.600 0.700 L 3.18 3.43 0.125 0.135 S 1.78 2.08 0.070 0.082 α 0° 10° 0° 10° N2 8 2 8 Drawing is not to scale. PDIP28 - 28 pin Plastic DIP, 600 mils width M28256
D Ne E1 E Nd CP B D2/E2 e A R 0.51 (.020) 1.14 (.045) F Symb mm inches Typ Min Max Typ Min Max A 2.54 3.56 0.100 0.140 A1 1.52 2.41 0.060 0.095 A2 – 0.38 – 0.015 B 0.33 0.53 0.013 0.021 B1 0.66 0.81 0.026 0.032 D 12.32 12.57 0.485 0.495 D1 11.35 11.56 0.447 0.455 D2 9.91 10.92 0.390 0.430 E 14.86 15.11 0.585 0.595 E1 13.89 14.10 0.547 0.555 E2 12.45 13.46 0.490 0.530 F 0.00 0.25 0.000 0.010 N3 2 3 2 Nd 7 7 Ne 9 9 Drawing is not to scale. PLCC32 - 32 lead Plastic Leaded Chip Carrier, rectangular M28256
E N CPB e D C LA1 α H A Symb mm inches Typ Min Max Typ Min Max A 2.46 2.64 0.097 0.104 A1 0.13 0.29 0.005 0.011 B 0.35 0.48 0.014 0.019 C 0.23 0.32 0.009 0.013 D 17.81 18.06 0.701 0.711 E 7.42 7.59 0.292 0.299 H 10.16 10.41 0.400 0.410 L 0.61 1.02 0.024 0.040 α 0° 8° 0° 8° N2 8 2 8 CP 0.10 0.004 Drawing is not to scale. SO28 - 28 lead Plastic Small Outline, 300 mils body width M28256
A 1.25 0.049 A1 0.20 0.008 A2 0.95 1.15 0.037 0.045 B 0.17 0.27 0.007 0.011 C 0.10 0.21 0.004 0.008 D 13.20 13.60 0.520 0.535 D1 11.70 11.90 0.461 0.469 E 7.90 8.10 0.311 0.319 L 0.50 0.70 0.020 0.028 α 0° 5° 0° 5° N2 8 2 8 CP 0.10 0.004 Drawing is not to scale. TSOP28 - 28 lead Plastic Thin Small Outline, 8 x 13.4mm TSOP-c E CP B e A D DIE C LA1 α M28256
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1999 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com M28256