Philips Semiconductors

Product specification

80C451/83C451/87C451

80C51 8-bit microcontroller family

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

1998 May 01

12

12MHz CLOCK

VARIABLE CLOCK

SYMBOL

FIGURE

PARAMETER

MIN

MAX

MIN

MAX

UNIT

Port 6 input (input rise and fall times = 5ns)

8

PE width

270

ns

8

IDS width

270

ns

8

Data setup to IDS high or PE high

0

0

ns

8

Data hold after IDS high or PE high

30

30

ns

9

IDS to BFLAG (IBF) delay

130

130

ns

Port 6 output

6

ODS width

270

ns

7

SEL to data out delay

85

85

ns

6

ODS to data out delay

80

80

ns

6

ODS to data float delay

35

35

ns

6

ODS to AFLAG (OBF) delay

100

100

ns

6

PE to data out delay

120

120

ns

7

ODS to AFLAG (SEL) delay

100

100

ns

External Clock

10

High time

20

20

ns

10

Low time

20

20

ns

10

Rise time

20

20

ns

10

Fall time

20

20

ns

NOTES:

1. Parameters are valid over operating temperature range unless otherwise specified.

2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.