EN87C51FA1SF76 查看數據表（PDF） - Atmel Corporation

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EN87C51FA1SF76

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Atmel Corporation 

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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