Philips Semiconductors

Product specification

87C552

80C51 8-bit microcontroller

1998 May 01

9

DC ELECTRICAL CHARACTERISTICS (Continued)

TEST

LIMITS

SYMBOL

PARAMETER

CONDITIONS

MIN

MAX

UNIT

Analog Inputs (Continued)

Analog input voltage

V

Reference voltage:

V

V

10

50

k

Ω

Analog input capacitance

15

pF

Sampling time

µs

Conversion time (including sampling time)

µs

±1

LSB

±2

LSB

±2

LSB

±0.4

%

±3

LSB

Channel to channel matching

±1

LSB

0–100kHz

–60

dB

NOTES FOR DC ELECTRICAL CHARACTERISTICS:

0 while an input voltage above 3.0V will be recognized as a logic 1.

6. Pins of ports 1 (except P1.6, P1.7), 2, 3, and 4 source a transition current when they are being externally driven from 1 to 0. The transition

to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-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

single output sinks more than 5mA and no more than two outputs exceed the test conditions.

address bits are stabilizing.

12. The ADC is monotonic; there are no missing codes.

appropriate adjustment of gain and offset error. (See Figure 1.)

a straight line which fits the ideal transfer curve. (See Figure 1.)

and the straight line which fits the ideal transfer curve. Gain error is constant at every point on the transfer curve. (See Figure 1.)

ADC and the ideal transfer curve.

17. This should be considered when both analog and digital signals are simultaneously input to port 5.