87C51 데이터 시트보기 (PDF) - Intel

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87C51

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Intel 

87C51 80C51BH 80C31BH

NOTES

1 ‘‘Typicals’’ are based on a limited number of samples taken from early manufacturing lots and are not guaranteed The

values listed are at room temp 5V

2 Capacitive loading on Ports 0 and 2 may cause noise pulses above 0 4V to be superimposed on the VOLs of ALE and

Ports 1 2 and 3 The noise is due to external bus capacitance discharging into the Port 0 and Port 2 pins when these pins

change from 1 to 0 In applications where capacitive loading exceeds 100 pF the noise pulses on these signals may exceed

0 8V It may be desirable to qualify ALE or other signals with a Schmitt Trigger or CMOS-level input logic

3 Capacitive loading on Ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the 0 9VCC specifi-

cation when the address bits are stabilizing

4 See Figures 6 through 8 for ICC test conditions Minimum VCC for Power Down is 2V

5 Under steady state (non-transient) conditions IOL must be externally limited as follows

Maximum IOL per port pin

Maximum IOL per 8-bit port

Port 0

10 mA

26 mA

Ports 1 2 and 3 15 mA

Maximum total IOL for all output pins 71 mA

If IOL exceeds the test condition VOL may exceed the related specification

Pins are not guaranteed to sink greater than the listed test conditions

Figure 5 87C51 BH ICC vs Frequency

272335 – 26

10

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