AT89LP428-20MU ATMEL [ATMEL Corporation], AT89LP428-20MU Datasheet - Page 132

• Manufacturer Part Number: AT89LP428-20MU
• Description: 8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

24.4
The values shown in this table are valid for T
Figure 24-9. External Clock Drive Waveform
Table 24-1.
Table 24-2.
24.5
The values shown in this table are valid for T
Table 24-3.
132
Symbol
1/t
t
t
t
t
t
Symbol
f
f
Symbol
R
V
V
V
t
t
CLCL
CHCX
CLCX
CLCH
CHCL
XTAL
RC
POR
WDTRST
POR
BOD
BH
RST
CLCL
Clock Characteristics
Reset Characteristics
AT89LP428/828
Parameter
Oscillator Frequency
Clock Period
External Clock High Time
External Clock Low Time
External Clock Rise Time
External Clock Fall Time
Parameter
Crystal Oscillator Frequency
Internal Oscillator Frequency
Parameter
Reset Pull-up Resistor
Power-On Reset Threshold
Brown-Out Detector Threshold
Brown-Out Detector Hysteresis
Power-On Reset Delay
Watchdog Reset Pulse Width
External Clock Parameters
Clock Characteristics
Reset Characteristics
A
A
= -40°C to 85°C and V
= -40°C to 85°C and V
Condition
Low Speed Oscillator
High Speed Oscillator
T
V
Condition
A
DD
= 25°C; V
V
Min
= 2.4 to 5.5V
50
12
12
CC
0
= 2.4V to 5.5V
CC
= 5.0V
CC
CC
Max
= 2.4 to 5.5V, unless otherwise noted.
= 2.4 to 5.5V, unless otherwise noted.
20
5
5
16t
V
7.92
7.60
Min
Min
Min
200
135
0.5
1.3
1.9
40
12
12
10
50
CC
0
CLCL
= 4.0V to 5.5V
Max
Max
8.08
8.40
Max
500
250
300
150
1.6
2.2
25
25
4
4
3654A–MICRO–8/09
Units
Units
Units
MHz
MHz
MHz
MHz
kHz
mV
kΩ
ns
ns
ns
ns
ns
µs
ns
V
V