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P87C58-24 Datasheet(PDF) 12 Page - Intel Corporation |
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P87C58-24 Datasheet(HTML) 12 Page - Intel Corporation |
12 / 23 page 8XC525458 EXPLANATION OF THE AC SYMBOLS Each timing symbol has 5 characters The first char- acter is always a ‘T’ (stands for time) The other characters depending on their positions stand for the name of a signal or the logical status of that signal The following is a list of all the characters and what they stand for A Address C Clock D Input Data H Logic level HIGH I Instruction (program memory contents) L Logic level LOW or ALE P PSEN Q Output Data R RD signal T Time V Valid W WR signal X No longer a valid logic level Z Float For example TAVLL e Time from Address Valid to ALE Low TLLPL e Time from ALE Low to PSEN Low AC CHARACTERISTICS (Over Operating Conditions Load Capacitance for Port 0 ALEPROG and PSEN e 100 pF Load Capacitance for All Other Outputs e 80 pF) EXTERNAL MEMORY CHARACTERISTICS All parameter values apply to all devices unless otherwise indicated In this table 8XC5X refers to 8XC5X 8XC5X-1 and 8XC5X-2 Symbol Parameter Oscillator Units 12 MHz 24 MHz 33 MHz Variable Min Max Min Max Min Max Min Max 1TCLCL Oscillator Frequency 8XC5X 35 12 MHz 8XC5X-1 35 16 MHz 8XC5X-2 05 12 MHz 8XC5X-24 35 24 MHz 8XC5X-33 35 33 MHz TLHLL ALE Pulse Width 127 43 21 2 TCLCL b 40 ns TAVLL Address Valid to ALE Low 8XC5X 43 TCLCL b 40 ns 8XC5X-24 12 TCLCL b 30 ns 8XC5X-33 5 TCLCL b 25 ns TLLAX Address Hold After ALE Low 8XC5X-24 53 12 TCLCL b 30 ns 8XC5X-33 5 TCLCL b 25 ns TLLIV ALE Low to Valid Instruction In 8XC5X 234 4 TCLCL b 100 ns 8XC5X-24 91 4 TCLCL b 75 ns 8XC5X-33 56 4 TCLCL b 65 ns 12 |
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