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NOTES FOR DC ELECTRICAL CHARACTERISTICS: 1. See Figures 9 through 11 for IDD test conditions. 2. The operating supply current is measured with all output pins disconnected; XTALl driven with tr = tf = 5ns; VIL = VSS + 0.5V; VIH = VDD -0.5V; XTAL2 not connected; EA = RST = Port 0 = P1.6 = P1.7 = VDD. See Figure 9. 3. The idle mode supply current is measured with all output pins disconnected; XTALl driven with tr = tf = 5ns; VIL = VSS + 0.5V; VIH = VDD -0.5V; XTAL2 not connected; Port 0 = P1.6 = P1.7 = VDD; EA = RST = Vss. See Figure 10. 4. The power-down current is measured with all output pins disconnected; XTAL2 not connected; Port 0 = P1.6 = P1.7 = VDD; EA = RST = Vss. See Figure 11. 5. 2V " VPD " VDDmax. 6. Pins of ports l , 2, and 3 source a transition current when they are being externally driven from l t0 0. The transition current reaches its maximum value when VIN iS approximately 2V. 7. Capacitive loading on ports o and 2 may cause spurious noise to be superimposed on the VOLS of ALE and ports l and 3. The noise is due to external bus capacitance discharging into the port o and port 2 pins when these pins make l-to-0 transitions during bus operations. In the worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. 8. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL = 10mA per port pin; Maximum IOL = 26mA total for Port 0; Maximum IOL = 15mA total for Ports l, 2, and 3; Maximum IOL = 71 mA total for all output pins. If IOL exceeds the test conditions, VOL rnay exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 9. Capacitive loading on ports o and 2 may cause the VOH on ALE and PSEN to momentarily fall below the 0.9VDD specification when the address bits are stabilizing. 10.IDDMAX for other frequencies can be derived from Figure l, where FREQ is the external oscillator frequency in MHz. IDDMAX iS given in mA.
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