p80c550efaa NXP Semiconductors, p80c550efaa Datasheet - Page 20

• Manufacturer Part Number: p80c550efaa
• Description: 80c51 8-bit Microcontroller Family 4k/128 Otp/rom/romless, Channel Watchdog Timer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1998 May 01
NOTE:
AC inputs during testing are driven at V
Timing measurements are made at V
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer
V
CC
0.45V
–0.5
Figure 10. AC Testing Input/Output
0.2V
0.2V
IH
CC
CC
CC
min for a logic ‘1’ and V
+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
I
CC
Figure 12. I
mA
IL
max for a logic ‘0’.
30
25
20
15
10
5
CC
SU00717
vs. FREQ (Commercial Temp. Range)
4MHz
FREQ at XTAL1
8MHz
20
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
12MHz
V
LOAD
V
V
16MHz
LOAD
LOAD
OH
MAX ACTIVE MODE
TYP ACTIVE MODE
MAX IDLE MODE
TYP IDLE MODE
/I
–0.1V
+0.1V
OL
Figure 11. Float Waveform
20mA.
SU00201
80C550/83C550/87C550
REFERENCE
TIMING
POINTS
Product specification
V
V
OH
OL
+0.1V
–0.1V
SU00011
OH
/V
OL