SAA5X9X Datasheet, PDF (59/68 Pages) NXP Semiconductors – Economy teletext and TV microcontrollers

Philips Semiconductors
Economy teletext and TV microcontrollers
Preliminary specification
SAA5x9x family
13 CHARACTERISTICS FOR THE I²C-BUS INTERFACE
SYMBOL
PARAMETER
INPUT
OUTPUT
I²C-BUS SPECIFICATION
SCL timing
t_HD;STA
t_LOW
t_HIGH
t_rC
t_fC
START condition hold time
SCL LOW time
SCL HIGH time
SCL rise time
SCL fall time
≥4.0 µs
≥4.7 µs
≥4.0 µs
≤1.0 µs
≤0.3 µs
note 1
note 1
≥4.0 µs; note 2
note 3
≤0.3 µs; note 4
≥4.0 µs
≥4.7 µs
≥4.0 µs
≤1.0 µs
≤0.3 µs
SDA timing
t_SU;DAT1
t_HD;DAT
t_SU;STA
t_SU;STO
t_BUF
t_rD
t_fD
data set-up time
data hold time
repeated START set-up time
STOP condition set-up time
bus free time
SDA rise time
SDA fall time
≥250 ns
≥0 ns
≥4.7 µs
≥4.0 µs
≥4.7 µs
≤1.0 µs
≤0.3 µs
note 1
note 1
note 1
note 1
note 1
note 3
≤0.3 µs; note 4
≥250 ns
≥0 ns
≥4.7 µs
≥4.0 µs
≥4.7 µs
≤1.0 µs
≤0.3 µs
Notes
1. This parameter is determined by the user software. It must comply with the I²C-bus specification.
2. This value gives the auto-clock pulse length which meets the I²C-bus specification for the special crystal frequency.
Alternatively, the SCL pulse must be timed by software.
3. The rise time is determined by the external bus line capacitance and pull-up resistor. It must be less than 1 µs.
4. The maximum capacitance on bus lines SDA and SCL is 400 pF.
1997 Jul 07
59