87C528 Philips Semiconductors, 87C528 Datasheet - Page 16

• Manufacturer Part Number: 87C528
• Description: 80C51 8-bit microcontrollers 16K/32K/ 512 OTP/ I2C/ watchdog timer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1999 Jul 23
NOTE:
AC inputs during testing are driven at V
Timing measurements are made at V
80C51 8-bit microcontrollers
16K/32K, 512 OTP, I
(INPUT/OUTPUT)
(INPUT/OUTPUT)
V
DD
0.45V
–0.5
SDA
SCL
START or repeated START condition
Figure 7. AC Testing Input/Output
t
HD;STA
t
FD
0.2V
0.2V
IH
DD
t
min for a logic ‘1’ and V
t
LOW
DD
DD
RC
+0.9
–0.1
–0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Valid only within frequency specifications of the device under test
2
t
RD
C, watchdog timer
t
HIGH
V
CC
0.45V
I
CC
–0.5
mA
IL
t
max for a logic ‘0’.
FC
Figure 5. Timing SIO1 (I
t
30
25
20
15
10
SU;DAT1
5
Figure 6. External Clock Drive
0.2V
t
CHCL
SU00167
0.7V
Figure 9. I
4 MHz
CC
CC
–0.1
FREQ AT XTAL1
t
HD;DAT
8 MHz 12 MHz 16 MHz
CC
16
t
CLCX
vs. FREQ.
NOTE:
For timing purposes, a port is no longer floating when a 100mV change from load
voltage occurs, and begins to float when a 100mV change from the loaded V
level occurs. I
2
V
t
C) Interface
CLCL
LOAD
t
repeated START condition
STOP condition
CHCX
V
V
t
CLCH
LOAD
LOAD
MAX ACTIVE MODE
TYP ACTIVE MODE
MAX IDLE MODE
TYP IDLE MODE
OH
/I
–0.1V
+0.1V
OL
SU00009
SU00168
20mA.
Figure 8. Float Waveform
t
SU;DAT2
REFERENCE
t
SU;STA
TIMING
POINTS
t
SU;STO
0.7 V
0.3 V
87C524/87C528
t
SU;DAT3
CC
CC
t
BUF
Product specification
0.7 V
0.3 V
START condition
CC
CC
V
V
SU00107A
OH
OL
+0.1V
–0.1V
SU00011
OH
/V
OL