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M87C257-60XC7TR Datasheet(PDF) 2 Page - STMicroelectronics |
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M87C257-60XC7TR Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 13 page A1 A0 Q0 A7 A4 A3 A2 A6 A5 A13 A10 A8 A9 Q7 A14 A11 G E Q5 Q1 Q2 Q3 VSS Q4 Q6 A12 ASVPP VCC AI00929 M87C257 8 1 2 3 4 5 6 7 9 10 11 12 13 14 16 15 28 27 26 25 24 23 22 21 20 19 18 17 Figure 2A. DIP Pin Connections Warning: NC = Not Connected, DU = Dont’t Use. AI00930 A8 A10 17 A0 NC Q0 A6 A3 A2 A1 A5 A4 9 A9 1 A11 Q6 Q7 32 M87C257 NC G E 25 Figure 2B. LCC Pin Connections DEVICE OPERATION The modes of operation of the M87C257 are listed in the Operating Modes. A single power supply is required in the read mode. All inputs are TTL levels except for VPP and 12V on A9 for Electronic Signa- ture. Read Mode The M87C257 has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable (E) is the power control and should be used for device selection. Output Enable (G) is the output control and should Symbol Parameter Value Unit TA Ambient Operating Temperature –40 to 125 °C TBIAS Temperature Under Bias –50 to 125 °C TSTG Storage Temperature –65 to 150 °C VIO (2) Input or Output Voltages (except A9) –2 to 7 V VCC Supply Voltage –2 to 7 V VA9 (2) A9 Voltage –2 to 13.5 V VPP Program Supply Voltage –2 to 14 V Notes: 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 SGS-THOMSON 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. Table 2. Absolute Maximum Ratings (1) 2/13 M87C257 |
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