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PC87310 Datasheet(PDF) 43 Page - National Semiconductor (TI) |
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PC87310 Datasheet(HTML) 43 Page - National Semiconductor (TI) |
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43 / 52 page  70 AC Electrical Characteristics TA e 0 Cto a70 C VDD ea5V g10% Symbol Parameter Conditions Min Max Units CPU INTERFACE tAR Delay from Address to RD 19 ns tAW Delay from Address to WR 19 ns tCH Duration of Clock High Pulse External Clock (24 MHz Max) 16 ns tCL Duration of Clock Low Pulse External Clock (24 MHz Max) 16 ns tDH Data Hold Time 10 ns tDS Data Setup Time 19 ns tHZ RD to Floating Data Delay (Note 1) 13 25 ns tMR Master Reset Pulse Width 100 ns tPH Port Hold 25 ns tPS Port Setup 18 ns tRA Address Hold Time from RD 0ns tRC Read Cycle Update 36 ns tRD RD Strobe Width 60 ns tRI Read Strobe to Clear IRQ6 52 ns tRVD Delay from RD to Data 39 ns tWA Address Hold Time from WR 0ns tWC Write Cycle Update 36 ns tWI Write Strobe to Clear IRQ6 52 ns tWO Write to Output 41 ns tWR WR Strobe Width 60 ns RC Read Cycle e tAR a tRD a tRC 115 ns WC Write Cycle e tAW a tWR a tWC 115 ns Note 1 Charge and discharge time is determined by VOL VOH and the external loading Note 2 All AC timings can be met with current loads that don’t exceed 32 mA or b80 mA at 100 pF capacitive loading Note 3 For capacitive loads that exceed 100 pF the following typical derating factors should be used 100 pF k CL s 150 pF t e (01 nspF) (CL b 100 pF) typical 150 pF k CL s 200 pF t e (008 nspF) (CL b 100 pF) and t e (05 nsmA) (ISINK mA) or t eb(05 nsmA) (ISOURCE mA) ISOURCE is always negative ISINK s 48 mA ISOURCE s b120 mA CL s 250 pF AC Test Conditions (Notes 1 2 3) Input Pulse Levels GND to 3V Input Rise and Fall Times 6 ns Input and Output Reference Levels 13V TRI-STATE Reference Levels Active High b 05V Active Low a 05V Note 1 CL e 100 pF includes jig and scope capacitance Note 2 S1 e open for push-pull outputs S1 e VCC for high impedance to active low and active low to high impedance measurements S1 e GND for high impedance to active high and active high to high imepedance measure- ments RL e 10 kX for mP interface pins Note 3 For the Open Drain Drive Interface Pins S1 e VCC and RL e 150X TLC10591 – 20 43 |
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