83C749 Datasheet, PDF (14/22 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count

Philips Semiconductors
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
Preliminary specification
83C749/87C749
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
L – Logic level low
Q – Output data
T – Time
V – Valid
X – No longer a valid logic level
Z – Float
V_CC –0.5
0.45V
0.2 V_CC + 0.9
0.2 V_CC – 0.1
t_CLCX
t_CHCL
t_CLCL
t_CHCX
t_CLCH
Figure 4. External Clock Drive
SU00297
1998 Apr 23
V_CC –0.5
0.45V
0.2 V_CC + 0.9
0.2 V_CC – 0.1
Figure 5. AC Testing Input/Output
SU00307
22
20
18
16
14
I_CC mA ¹²
10
8
6
4
2
MAX ACTIVE I_CC6
TYP ACTIVE I_CC6
MAX IDLE I_CC7
TYP IDLE I_CC7
4MHz
8MHz 12MHz 16MHz
FREQ
SU00308
Figure 6. I_CC vs. FREQ
Maximum I_CC values taken at V_CC = 5.5V and worst case temperature.
Typical I_CC values taken at V_CC = 5.0V and 25°C.
Notes 6 and 7 refer to AC Electrical Characteristics.
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