P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 13

• Manufacturer Part Number: P87C52
• Description: 80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
• Manufacturer: PHILIPS [NXP Semiconductors]

1. At f
2. This parameter is determined by the user software, it has to comply with the I
3. This value gives the autoclock pulse length which meets the I
4. Spikes on SDA and SCL lines with a duration of less than 4
5. The rise time is determined by the external bus line capacitance and pull-up resistor, it must be
6. The maximum capacitance on bus lines SDA and SCL is 400pF.
Philips Semiconductors
AC ELECTRICAL CHARACTERISTICS – I
NOTES:
1999 Jul 23
SCL TIMING CHARACTERISTICS
t
t
t
t
t
SDA TIMING CHARACTERISTICS
t
t
t
t
t
t
t
SYMBOL
HD;STA
LOW
HIGH
RC
FC
SU;DAT1
HD;DAT
SU;STA
SU;STO
BUF
RD
FD
80C51 8-bit microcontrollers
16K/32K, 512 OTP, I
SCL pulse may be timed by software.
CLK
= 3.5MHz, this evaluates to 14
START condition hold time
SCL LOW time
SCL HIGH time
SCL rise time
SCL fall time
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
PARAMETER
2
C, watchdog timer
286ns = 4 s, i.e., the bit-level I
2
C INTERFACE
2
f
C specification for the specified XTAL clock frequency range. Alternatively, the
CLK
will be filtered out.
13
14 t
14 t
14 t
14 t
14 t
INPUT
16 t
0.3 s
0.3 s
250ns
1 s
1 s
0ns
2
CLCL
CLCL
CLCL
CLCL
CLCL
C interface can respond to the I
CLCL
1
4
1
4
1
1
1
1
1
2
C.
OUTPUT
80 t
Note 2
Note 2
Note 5
Note 2
Note 2
Note 2
Note 2
Note 2
Note 5
0.3 s
0.3 s
1 s.
CLCL
6
6
3
2
C protocol for f
87C524/87C528
I
2
C SPECIFICATION
CLK
Product specification
250ns
4.0 s
4.7 s
4.0 s
1.0 s
0.3 s
4.7 s
4.0 s
4.7 s
1.0 s
0.3 s
0ns
3.5 MHz.