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DS87C530 Datasheet(PDF) 35 Page - Dallas Semiconductor |
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DS87C530 Datasheet(HTML) 35 Page - Dallas Semiconductor |
35 / 47 page DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock 35 of 47 AC ELECTRICAL CHARACTERISTICS (Note 1) 33MHz VARIABLE CLOCK PARAMETER SYMBOL MIN MAX MIN MAX UNITS External Oscillator 0 33 0 33 Oscillator Frequency External Crystal 1/tCLCL 1 33 1 33 MHz ALE Pulse Width tLHLL 40 1.5tCLCL-5 ns Port 0 Address Valid to ALE Low tAVLL 10 0.5tCLCL-5 ns Address Hold after ALE Low tLLAX1 (Note 2) (Note 2) ns ALE low to Valid Instruction In tLLIV 43 2.5tCLCL-33 ns ALE Low to PSEN Low tLLPL 4 0.5tCLCL-11 ns PSEN Pulse Width tPLPH 55 2tCLCL-5 ns PSEN Low to Valid Instruction In tPLIV 37 2tCLCL-24 ns Input Instruction Hold after PSEN tPXIX 0 0 ns Input Instruction Float after PSEN tPXIZ 26 tCLCL-5 ns Port 0 Address to Valid Instruction In tAVIV1 59 3tCLCL-32 ns Port 2 Address to Valid Instruction In tAVIV2 68 3.5tCLCL-38 ns PSEN Low to Address Float tPLAZ (Note 2) (Note 2) ns Note 1: All parameters apply to both commercial and industrial temperature range operation unless otherwise noted. Specifications to -40°C are guaranteed by design and are not production tested. AC electrical characteristics are not 100% tested, but are characterized and guaranteed by design. All signals are characterized with load capacitance of 80pF except Port 0, ALE, PSEN, RD and WR with 100pF. Interfacing to memory devices with float times (turn off times) over 25ns may cause contention. This will not damage the parts, but will cause an increase in operating current. Specifications assume a 50% duty cycle for the oscillator. Port 2 and ALE timing will change in relation to duty cycle variation. Note 2: Address is driven strongly until ALE falls, and is then held in a weak latch until overdriven externally. |
Similar Part No. - DS87C530_05 |
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Similar Description - DS87C530_05 |
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