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AT27C516-85 Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT27C516-85 Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 8 page AC Programming Characteristics TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V Sym- bol Parameter Test Conditions* (1) Limit Units Min Max tAS Address Setup Time 2 µs tCES CE Setup Time 2 µs tOES OE Setup Time 2 µs tDS Data Setup Time 2 µs tAH Address Hold Time 0 µs tDH Data Hold Time 2 µs tDFP OE High to Output Float Delay (2) 0130 ns tVPS VPP Setup Time 2 µs tVCS VCC Setup Time 2 µs tPW PGM Program Pulse Width (3) 47.5 52.5 µs tOE Data Valid from OE 150 ns tPRT VPP Pulse Rise Time During Programming 50 ns *AC Conditions of Test: Input Rise and Fall Times (10% to 90%)..............20 ns Input Pulse Levels...................................0.45V to 2.4V Input Timing Reference Level...................0.8V to 2.0V Output Timing Reference Level................0.8V to 2.0V Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP. 2. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven — see timing diagram. 3. Program Pulse width tolerance is 50 µsec ± 5%. Atmel’s 27C516 Integrated Product Identification Code Codes Pins Hex Data A0 015-08 O7 O6 O5 O4 O3 O2 O1 O0 Manufacturer 0 0 0001111 0 001E Device Type 1 0 1111001 0 00F2 Rapid Programming Algorithm A 50 µs PGM pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and VPP is raised to 13.0V. Each address is first programmed with one 50 µs PGM pulse without verification. Then a verifica- tion / reprogramming loop is executed for each address. In the event a word fails to pass verification, up to 10 suc- cessive 50 µs pulses are applied with a verification after each pulse. If the word fails to verify after 10 pulses have been applied, the part is considered failed. After the word verifies properly, the next address is selected until all have been checked. VPP is then lowered to 5.0V and VCC to 5.0V. All words are read again and compared with the original data to determine if the device passes or fails. AT27C516 3-151 |
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