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BN87C51FB Datasheet(PDF) 10 Page - Intel Corporation |
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BN87C51FB Datasheet(HTML) 10 Page - Intel Corporation |
10 / 18 page ![]() AUTOMOTIVE 87C51FAFBFCFC-20 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 (TA eb40 Cto a125 C VCC e 5V g 20% VSS e 0V Load Capacitance for Port 0 ALEPROG and PSEN e 100 pF Load Capacitance for All Other Outputs e 80 pF) ADVANCED INFORMATIONCONTACT INTEL FOR DESIGN-IN INFORMATION EXTERNAL PROGRAM MEMORY CHARACTERISTICS Symbol Parameter 12 MHz Variable Oscillator Units Oscillator Min Max 87C51FAFBFC 87C51FC-20 Min Max 1TCLCL Oscillator Frequency 35 1620 MHz TLHLL ALE Pulse Width 127 2TCLCL b 40 ns TAVLL Address Valid to ALE Low 43 TCLCL b 40 ns TLLAX Address Hold After ALE Low 53 TCLCL b 30 ns TLLIV ALE Low to Valid 234 4TCLCL b 100 ns Instruction In 4TCLCL b 75 TLLPL ALE Low to PSEN Low 53 TCLCL b 30 ns TPLPH PSEN Pulse Width 205 3TCLCL b 45 ns TPLIV PSEN Low to Valid 145 3TCLCL b 105 ns Instruction In 3TCLCL b 90 TPXIX Input Inst Hold After 0 0 ns PSEN Trans TPXIZ Input Inst Float After 59 TCLCL b 25 ns PSEN Trans TCLCL b 20 TAVIV Address Valid to Valid 312 5TCLCL b 105 ns Instruction In TPLAZ PSEN Low to Address 10 10 ns Float TRLRH RD Pulse Width 400 6TCLCL b 100 ns TWLWH WR Pulse Width 400 6TCLCL b 100 ns 10 |
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