Philips Semiconductors

Product specification

87C552

80C51 8-bit microcontroller

1998 May 01

12

AC ELECTRICAL CHARACTERISTICS (Continued)

SYMBOL

PARAMETER

INPUT

OUTPUT

START condition hold time

> 4.0

SCL low time

> 4.7

SCL high time

> 4.0

SCL rise time

≤ 1µs

SCL fall time

≤ 0.3µs

< 0.3

Data set-up time

≥ 250ns

SDA set-up time (before rep. START cond.)

≥ 250ns

> 1

SDA set-up time (before STOP cond.)

≥ 250ns

Data hold time

≥ 0ns

Repeated START set-up time

> 4.7

STOP condition set-up time

> 4.0

Bus free time

> 4.7

SDA rise time

≤ 1µs

SDA fall time

≤ 0.3µs

< 0.3

NOTES:

1. At 100 kbit/s. At other bit rates this value is inversely proportional to the bit-rate of 100 kbit/s.

2. Determined by the external bus-line capacitance and the external bus-line pull-resistor, this must be < 1

µs.

SCL = 400pF.

5. These values are guaranteed but not 100% production tested.