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80C51GB Datasheet(PDF) 11 Page - Intel Corporation |
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80C51GB Datasheet(HTML) 11 Page - Intel Corporation |
11 / 22 page 8XC51GB 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 SPECIFICATIONS Over Operating Conditions Load Capacitance on Port 0 ALE and PSEN e 100 pF Load Capacitance on all other outputs e 80 pF EXTERNAL PROGRAM AND DATA MEMORY CHARACTERISTICS Symbol Parameter 12 MHz Osc Variable Osc Units Min Max Min Max 1TCLCL Osc Freq 35 16 MHz TLHLL ALE Pulse Width 127 2TCLCL b 40 ns TAVLL ADDR Valid to ALE Low 43 TCLCL b 40 ns TLLAX ADDR Hold after ALE Low 53 TCLCL b 30 ns TLLIV ALE Low to Valid Inst IN 234 4TCLCL b 100 ns 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 Instr In 145 3TCLCL b 105 ns TPXIX Input Instr Hold after PSEN 00 ns TPXIZ Input Instr Float after PSEN 59 TCLCL b 25 ns TAVIV ADDR to Valid Instr In 312 5TCLCL b 105 ns TPLAZ PSEN Low to ADDR Float 10 10 ns TRLRH RD Pulse Width 400 6TCLCL b 100 ns TWLWH WR Pulse Width 400 6TCLCL b 100 ns TRLDV RD Low to Valid Data In 252 5TCLCL b 165 ns TRHDX Data Hold after RD 00 ns TRHDZ Data Float after RD 107 2TCLCL b 60 ns TLLDV ALE Low to Valid Data In 517 8TCLCL b 150 ns TAVDV ADDR to Valid Data In 585 9TCLCL b 165 ns TLLWL ALE Low to RD or WR Low 200 300 3TCLCL b 50 3TCLCL a 50 ns TAVWL ADDR Valid to RD or WR Low 203 4TCLCL b 130 ns TQVWX Data Valid to WR Transition 33 TCLCL b 50 ns TWHQX Data Hold after WR 33 TCLCL b 50 ns TQVWH Data Valid to WR High 433 7 TCLCL b 150 ns TRLAZ RD Low to Addr Float 0 0 ns TWHLH RD or WR High to ALE High 43 123 TCLCL b 40 TCLCL a 40 ns 11 |
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