AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 175

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Shift Register Timing
Waveforms
External Clock Drive
Waveforms
AC Testing
Input/Output
Waveforms
Float Waveforms
7663E–8051–10/08
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE to SBUF
INPUT DATA
CLEAR RI
Table 127. AC Parameters for a Variable Clock
Notes:
AC inputs during testing are driven at V
measurement are made at V
Symbol
T
T
T
T
T
T
QVXH
QVHX
XHQX
XHDX
XHDV
0
XLXL
INPUT/OUTPUT
1. ‘ -L ‘ refers to 2V - 5.5V version.
2. ‘ -M ’ refers to 4.5V to 5.5V version.
0.45V
T
XHDV
V
CC
Type
1
-0.5V
Max
0
Min
Min
Min
Min
VALID
T
XLXL
T
Standard
XHQX
2
1
10 T - x
10 T - x
Clock
0.2V
2 T - x
VALID
12 T
0.7V
x
CC
IH
CC
-0.1
T
V
CHCL
T
CC
min. for a logic “1” and V
V
V
3
XHDX
2
OH
OL
0.45V
-0.5V
VALID
X2 Clock
+ 0.1V
- 0.1V
5 T - x
5 T- x
T - x
6 T
x
4
CC
3
VALID
FLOAT
V
- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing
LOAD
X Parameter For
T
-M
CLCX
5
(1)
4
VALID
133
Range
50
20
0
0.2 V
0.2 V
IL
max for a logic “0”.
T
6
5
CLCL
CC
CC
VALID
+ 0.9
- 0.1
V
V
X Parameter For
T
LOAD
LOAD
CLCH
-L
T
7
6
CHCX
(2)
+ 0.1V
- 0.1V
VALID
133
Range
50
20
AT89C51RE2
0
SET TI
SET RI
8
7
VALID
Units
ns
ns
ns
ns
ns
175