AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 174

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.6
The values shown in this table are valid for T
ating conditions, load capacitance for Port 0 and ALE = 100 pF; load capacitance for all other outputs = 80 pF. Parameters
refer to
Table 26-4.
Notes:
174
Symbol
1/t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
LHLL
AVLL
LLAX
RLRH
WLWH
RLDV
RHDX
RHDZ
LLDV
AVDV
LLWL
AVWL
QVWX
QVWH
WHQX
RLAZ
WHAX
WHLH
CLCL
Figure 26-6
External Data Memory Characteristics
1. This assumes 50% clock duty cycle. The half period depends on the clock high value t
2. This assumes 50% clock duty cycle. The half period depends on the clock low value t
3. Parameter t
4. The strobe pulse width may be lengthened by 1, 2 or 3 additional t
5. Parameter t
AT89LP6440 - Preliminary
Parameter
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold after ALE Low
RD Pulse Width
WR Pulse Width
RD Low to Valid Data In
Data Hold after RD
Data Float after RD
ALE Low to Valid Data In
Address to Valid Data In
ALE Low to RD or WR Low
Address to RD or WR Low
Data Valid to WR Transition
Data Valid to WR High
Data Hold after WR
RD Low to Address Float
Address Hold after RD or WR High
RD or WR High to ALE High
External Data Memory Characteristics
and
LHLL
WHLH
Figure
applies only when ALES = 1.
applies only when ALES = 0, or when two MOVX instructions occur in succession.
(4)
(4)
(3)
26-7.
(5)
A
= -40°C to 85°C and V
DD
CLCL
= 2.4 to 3.6V, unless otherwise noted. Under oper-
using wait states.
0.5t
0.5t
1.5t
0.5t
1.5t
0.5t
0.5t
t
t
t
t
t
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Min
Variable Oscillator
0
0
- d
- d
- d
- d
- d
- d
- d
- d
- d
- d
- d
- d
CLCX
CHCX
(1)
(2)
(1)
(1)
(1)
(2)
(2)
(low duty cycle).
(high duty cycle).
-0.5t
2.5t
2t
t
t
t
t
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Max
24
+ d
+ d
- d
- d
- d
- d
+ d
(1)
(1)
3706A–MICRO–9/09
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns