Philips Semiconductors

Preliminary specification

OM5234/OM5284

CMOS single-chip 8-bit microcontrollers

1996 Nov 01

5

DC ELECTRICAL CHARACTERISTICS

TEST

LIMITS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

Input low voltage, except EA, P1.6, P1.7

–0.5

V

Input low voltage to EA

–0.5

V

Input low voltage to P1.6, P1.7

–0.5

V

Input high voltage, except XTAL1, RST, P1.6, P1.7

V

Input high voltage, XTAL1, RST

V

Output low voltage, ports 1, 2, 3, except P1.6, P1.7

0.45

V

Output low voltage, port 0, ALE, PSEN

0.45

V

Output low voltage, P1.6, P1.7

0.4

V

V

Logical 0 input current, ports 1, 2, 3, except P1.6, P1.7

–50

µA

Logical 1-to-0 transition current, ports 1, 2, 3, except P1.6, P1.7

See note 5

–650

µA

Input leakage current, port 0, EA, P1.6, P1.7

±10

µA

Power supply current:

32.0

mA

6

mA

50

µA

Internal reset pull-down resistor

40

225

k

Ω

Pin capacitance

15

pF

NOTES:

4. 2V

5. Pins of ports 1 , 2, and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its

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

ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input.

address bits are stabilizing.