P89C668 datasheet(78/89 Pages) PHILIPS

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Philips Semiconductors

Product data

P89C660/P89C662/P89C664/

P89C668

80C51 8-bit Flash microcontroller family

16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM

2002 Oct 28

AC ELECTRICAL CHARACTERISTICS (6 CLOCK MODE) (Continued)

Tamb = 0 °C to +70 °C, VCC = 5 V ± 10% or –40 °C to +85 °C,VCC = 5 V ± 5%, VSS = 0 V1, 2

SYMBOL

PARAMETER

INPUT

OUTPUT

I2C Interface

tHD;STA

START condition hold time

≥ 7 tCLCL

> 4.0

µs 4

tLOW

SCL low time

≥ 8 tCLCL

> 4.7

µs 46

tHIGH

SCL high time

≥ 7 tCLCL

> 4.0

µs 4

tRC

SCL rise time

≤ 1 µs

– 5

tFC

SCL fall time

≤ 0.3 µs

< 0.3

µs 6

tSU;DAT1

Data set-up time

≥ 250 ns

> 10 tCLCL – tRD

tSU;DAT2

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

≥ 250 ns

> 1

µs 4

tSU;DAT3

SDA set-up time (before STOP cond.)

≥ 250 ns

> 4 tCLCL

tHD;DAT

Data hold time

≥ 0 ns

> 4 tCLCL – tFC

tSU;STA

Repeated START set-up time

≥ 7 tCLCL 4

> 4.7

µs 4

tSU;STO

STOP condition set-up time

≥ 7 tCLCL 4

> 4.0

µs 4

tBUF

Bus free time

≥ 7 tCLCL 4

> 4.7

µs 4

tRD

SDA rise time

≤ 1 µs7

– 5

tFD

SDA fall time

≤ 300 ns7

< 0.3

µs 6

NOTES:

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

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

3. These values are characterized but not 100% production tested.

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

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

µs.

6. Spikes on the SDA and SCL lines with a duration of less than 3 tCLCL will be filtered out. Maximum capacitance on bus-lines SDA and

SCL = 400 pF.

7. tCLCL = 1/fOSC = one oscillator clock period at pin XTAL1.

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