15

83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER

Figure 5. External Clock Drive

Power Supply Current:

Active Mode at 6MHz

Idle Mode at 6MHz

Power Down Mode

7

2

10

12

5

50

mA

mA

µA

RST, EA# to

RST, EA# to

RST, EA# to

(RCIN pin to

external resis-

tor, all other

pins are no

connect)

Power on reset crossover

2.4

3

3.6

V

Table 7. D.C. Characteristics (Continued)

Symbol

Parameter

Min

Typical

(note 1)

Max

Unit

Test

Condition

NOTE:

1.

2.

10mA

22mA

15mA

Ports 3:

95mA

110mA

to sink current greater than the listed test conditions.

3.

Capacitive loading on Ports 0 and 2 may cause spurious noise pulses above 0.4V to be superimposed

on the low level outputs of ALE and Ports 1, 2 and 3. The noise is due to external bus capacitance dis-

charging into the Port 0 and Port 2 pins when these pins change from 1 to 0. In applications where

capacitive loading exceeds 100pF, the noise pulses on these signals may exceed 0.8V. It may be

desirable to qualify signals with a Schmitt Trigger, or CMOS-level input logic.

4.

specification when the address lines are stabilizing.

0.7 V

CC

A4252-01

0.45 V

V

0.2 V