87C52 NXP Semiconductors, 87C52 Datasheet - Page 28

• Manufacturer Part Number: 87C52
• Description: 80c51 8-bit Microcontroller Family 4 K/8 K Otp/rom Low Voltage 2.7 V?5.5 V , Low Power, High Speed 33 Mhz , 128/256 B Ram
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2000 Aug 07
AC inputs during testing are driven at V
NOTE:
Timing measurements are made at V
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
V
CC
0.45V
–0.5
Figure 19. 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
35
30
25
20
15
10
5
IL
4
max for a logic ‘0’.
8
SU00717
Figure 21. I
12
FREQ AT XTAL1 (MHz)
TYP ACTIVE MODE
16
28
CC
20
I
CC
vs. FREQ
MAX = 0.9 X FREQ. + 1.1
MAX IDLE MODE
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
V
OH
LOAD
24
TYP IDLE MODE
/V
OL
MAX ACTIVE
MODE
level occurs. I
28
V
V
LOAD
LOAD
32
SU01413
–0.1V
+0.1V
80C51/87C51/80C52/87C52
OH
Figure 20. Float Waveform
/I
36
OL
20mA.
REFERENCE
TIMING
POINTS
Product specification
V
V
OH
OL
SU00718
+0.1V
–0.1V