Philips Semiconductors

Product specification

87C652/87C654

80C51 8-bit microcontroller

1999 Jul 23

12

SYMBOL

PARAMETER

INPUT

OUTPUT

SCL TIMING CHARACTERISTICS

START condition hold time

> 4.0

SCL LOW time

> 4.7

SCL HIGH time

> 4.0

SCL rise time

≤ 1 µs

SCL fall time

≤ 0.3 µs

< 0.3

SDA TIMING CHARACTERISTICS

Data set-up time

≥ 250 ns

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

≥ 250 ns

> 1

SDA set-up time (before STOP cond.)

≥ 250 ns

Data hold time

≥ 0 ns

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 = 400 pF.

tRD

tSU;STA

tBUF

tSU;STO

0.7 VCC

0.3 VCC

0.7 VCC

0.3 VCC

tFD

tRC

tFC

tHIGH

tLOW

tHD;STA

tSU;DAT1

tHD;DAT

tSU;DAT2

tSU;DAT3

START condition

repeated START condition

SDA

(INPUT/OUTPUT)

SCL

(INPUT/OUTPUT)

STOP condition

START or repeated START condition

SU00107A