Philips Semiconductors

Product specification

80C451/83C451/87C451

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, expanded I/O

1998 May 01

10

TEST

LIMITS

SYMBOL

PARAMETER

CONDITIONS

MIN

MAX

UNIT

Input low voltage; except EA

–0.5

V

Input low voltage to EA

0

V

Input high voltage; except XTAL1, RST

V

Input high voltage; XTAL1, RST

V

Output low voltage; ports 1, 2, 3, 4, 5, 6

0.45

V

Output low voltage; port 0, ALE, PSEN

0.45

V

Output high voltage; ports 1, 2, 3, 4, 5, 6

2.4

V

V

V

Output high voltage (port 0 in external bus mode, ALE,

2.4

V

V

V

Logical 0 input current,; ports 1, 2, 3, 4, 5, 6

–50

µA

Logical 1-to-0 transition current; ports 1, 2, 3, 4, 5, 6

See note 4

–650

µA

Input leakage current; port 0

+10

µA

Power supply current:

See note 6

11.5

25

mA

1.3

4

mA

Power down mode

3

50

µA

Internal reset pull-down resistor

50

300

k

Ω

10

pF

NOTES:

1. Typical ratings are based on a limited number of samples taken from early manufacturing lots and are not guaranteed. The values listed are

at room temperature, 5V.

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.

4. 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