83C749 Philips Semiconductors, 83C749 Datasheet - Page 14

• Manufacturer Part Number: 83C749
• Description: 80C51 8-bit microcontroller family 2K/64 OTP/ROM/ 5 channel 8-bit A/D/ PWM/ low pin count
• Manufacturer: Philips Semiconductors

Philips Semiconductors
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has five characters. The first character is always
‘t’ (= time). The other characters, depending on their positions,
indicate the name of a signal or the logical status of that signal.
The designations are:
C – Clock
D – Input data
H – Logic level high
1998 Apr 23
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
V
CC
V
0.45V
CC
–0.5
0.45V
–0.5
Maximum I
I
CC
Notes 6 and 7 refer to AC Electrical Characteristics.
0.2 V
0.2 V
Typical I
CC
mA
CC
values taken at V
CC
– 0.1
+ 0.9
22
20
18
16
14
12
10
8
6
4
2
Figure 5. AC Testing Input/Output
CC
Figure 4. External Clock Drive
0.2 V
0.2 V
values taken at V
Figure 6. I
CC
CC
4MHz
+ 0.9
– 0.1
CC
t
CHCL
8MHz
CC
14
FREQ
= 5.5V and worst case temperature.
t
CLCX
vs. FREQ
L – Logic level low
Q – Output data
T – Time
V – Valid
X – No longer a valid logic level
Z – Float
CC
12MHz
= 5.0V and 25 C.
t
CLCL
16MHz
t
MAX ACTIVE I
TYP ACTIVE I
MAX IDLE I
TYP IDLE I
CLCH
t
CHCX
SU00308
CC
CC
CC
7
CC
7
6
6
SU00297
SU00307
83C749/87C749
Preliminary specification