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AT89LP51-20MU 数据表(PDF) 97 Page - ATMEL Corporation

部件名 AT89LP51-20MU
功能描述  8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
PDF  113 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89LP51-20MU 数据表(HTML) 97 Page - ATMEL Corporation

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97
3709C–MICRO–5/11
AT89LP51/52 - Preliminary
Note:
1. No wait state (single-cycle) fetch speed for Fast Mode
18.5
Reset Characteristics
The values shown in this table are valid for T
A = -40°C to 85°C and VDD = 2.4 to 5.5V, unless otherwise noted.
Table 18-1.
External Clock Parameters
Symbol
Parameter
V
DD = 2.4V to 5.5V
V
DD = 4.5V to 5.5V
Units
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency(1)
020025
MHz
tCLCL
Clock Period
50
40
ns
tCHCX
External Clock High Time
12
ns
t
CLCX
External Clock Low Time
12
ns
tCLCH
External Clock Rise Time
5
ns
tCHCL
External Clock Fall Time
5
ns
Table 18-2.
Clock Characteristics
Symbol
Parameter
Condition
Min
Max
Units
f
XTAL
Crystal Oscillator Frequency
Low Power Oscillator
0
12
MHz
High Power Oscillator
0
24
MHz
fRC
Internal Oscillator Frequency
T
A = 25°C; VDD = 5.0V
1.824
1.862
MHz
VDD = 2.4 to 5.5V
1.751
1.935
MHz
Table 18-3.
Reset Characteristics
Symbol
Parameter
Condition
Min
Max
Units
R
RST
Reset Pull-up Resistor
50
150
k
Ω
V
POR
Power-On Reset Threshold
1.3
1.6
V
VBOD
Brown-Out Detector Threshold
1.9
2.2
V
V
BH
Brown-Out Detector Hysteresis
200
300
mV
t
POR
Power-On Reset Delay
135
150
µs
tWDTRST
Watchdog Reset Pulse Width
49tCLCL
ns



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