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87C749 Datasheet(PDF) 14 Page - NXP Semiconductors

Part # 87C749
Description  80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

87C749 Datasheet(HTML) 14 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary specification
83C749/87C749
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
1998 Apr 23
14
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
tCHCL
tCLCL
tCLCH
tCHCX
VCC –0.5
0.45V
0.2 VCC + 0.9
0.2 VCC – 0.1
tCLCX
SU00297
Figure 4. External Clock Drive
0.2 VCC + 0.9
0.2 VCC – 0.1
VCC –0.5
0.45V
SU00307
Figure 5. AC Testing Input/Output
4MHz
8MHz
12MHz
16MHz
FREQ
MAX ACTIVE ICC
6
TYP ACTIVE ICC
6
MAX IDLE ICC
7
TYP IDLE ICC
7
ICC mA
2
4
6
8
10
12
14
16
18
20
22
SU00308
Figure 6. ICC vs. FREQ
Maximum ICC values taken at VCC = 5.5V and worst case temperature.
Typical ICC values taken at VCC = 5.0V and 25°C.
Notes 6 and 7 refer to AC Electrical Characteristics.


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