80C554 Datasheet, PDF (67/76 Pages) NXP Semiconductors – 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP

Philips Semiconductors
80C51 8-bit microcontroller – 6 clock operation
16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I²C, PWM,
capture/compare, high I/O, 64L LQFP
Preliminary specification
80C554/83C554/87C554
Table 11. I²C-bus interface timing
All values referred to V_IH(min) and V_IL(max) levels; see Figure 56⁵.
SYMBOL
t_HD;STA
t_LOW
t_HIGH
t_RC
t_FC
t_SU;DAT1
t_SU;DAT2
t_SU;DAT3
t_HD;DAT
t_SU;STA
t_SU;STO
t_BUF
t_RD
t_FD
PARAMETER
START condition hold time
LOW period of the SCL clock
HIGH period of the SCL clock
Rise time of SCL signals
Fall time of SCL signals
Data set-up time
SDA set-up time (before repeated START condition)
SDA set-up time (before STOP condition)
Data hold time
Set-up time for a repeated START condition
Set-up time for STOP condition
Bus free time between
Rise time of SDA signals
Fall time of SDA signals
I²C-BUS
INPUT
OUTPUT
≥ 7 t_CLK
≥ 8 t_CLK
≥ 7 t_CLK
≤ 1 µs
≤ 0.3 µs
> 4.0 µs¹
> 4.7 µs¹
> 4.0 µs¹
–²
< 0.3 µs³
≥ 250 ns
≥ 250 ns
> 10 t_CLK–t_RD
> 1 µs¹
≥ 250 ns
≥ 0 ns
≥ 7 t_CLK
≥ 7 t_CLK
≥ 7 t_CLK
≤ 1 µs
≤ 0.3 µs
> 4 t_CLK
> 4 t_CLK–t_FC
> 4.7 µs¹
> 4.0 µs¹
> 4.7 µs¹
–²
< 0.3 µs³
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.
3. Spikes of the SDA and SCL lines with a duration of less than 3 t_CLK will be filtered out. Maximum capacitance on bus-lines SDA and
SCL = 400 pF.
4. t_CLK = 1/f_CLK = one oscillator clock period at pin XTAL1. For 83 ns < t_CLK < 285 ns (12 MHz > f_CLK > 3.5 MHz) the SI01 interface meets the
I²C-bus specification for bit-rates up to 100 kbit/s.
5. These values are guaranteed but not 100% production tested.
6. See application note AN457 for external memory interface.
7. Parts are guaranteed to operate down to 0Hz.
2000 Nov 10
67