Philips Semiconductors

Product data

P80C3xX2; P80C5xX2;

P87C5xX2

80C51 8-bit microcontroller family

4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),

low power, high speed (30/33 MHz)

2003 Jan 24

42

AC ELECTRICAL CHARACTERISTICS (6-CLOCK MODE, 5 V

±10% OPERATION)

Symbol

Figure

Parameter

Limits

16 MHz Clock

Unit

MIN

MAX

MIN

MAX

31

Oscillator frequency

0

30

–

–

MHz

27

ALE pulse width

–

54.5

–

ns

27

Address valid to ALE low

–

18.25

–

ns

27

Address hold after ALE low

–

11.25

–

ns

27

ALE low to valid instruction in

–

–

90

ns

27

ALE low to PSEN low

–

21.25

–

ns

27

PSEN pulse width

–

83.75

–

ns

27

PSEN low to valid instruction in

–

–

58.75

ns

27

Input instruction hold after PSEN

0

–

0

–

ns

27

Input instruction float after PSEN

–

–

21.25

ns

27

Address to valid instruction in

–

–

121.25

ns

27

PSEN low to address float

–

10

–

10

ns

Data Memory

28

RD pulse width

–

167.5

–

ns

29

WR pulse width

–

167.5

–

ns

28

RD low to valid data in

–

–

121.25

ns

28

Data hold after RD

0

–

0

–

ns

28

Data float after RD

–

–

52.5

ns

28

ALE low to valid data in

–

–

215

ns

28

Address to valid data in

–

–

246.25

ns

28, 29

ALE low to RD or WR low

78.75

108.75

ns

28, 29

Address valid to WR low or RD low

–

110

–

ns

29

Data valid to WR transition

–

6.25

–

ns

29

Data hold after WR

–

16.25

–

ns

29

Data valid to WR high

–

213.75

–

ns

28

RD low to address float

–

0

–

0

ns

28, 29

RD or WR high to ALE high

21.25

41.25

ns

External Clock

31

High time

–

–

ns

31

Low time

–

–

ns

31

Rise time

–

5

–

–

ns

31

Fall time

–

5

–

–

ns

Shift register

30

Serial port clock cycle time

–

375

–

ns

30

Output data setup to clock rising edge

–

287.5

–

ns

30

Output data hold after clock rising edge

–

47.5

–

ns

30

Input data hold after clock rising edge

0

–

0

–

ns

30

Clock rising edge to input data valid

–

–

179.5

ns

NOTES:

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

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

3. Interfacing the microcontroller to devices with float time up to 45ns is permitted. This limited bus contention will not cause damage to port 0

drivers.

4. Parts are guaranteed by design to operate down to 0 Hz.

5. Data shown in the table are the best mathematical models for the set of measured values obtained in tests. If a particular parameter

calculated at a customer specified frequency has a negative value, it should be considered equal to zero.