DS89C420-ENG Maxim Integrated Products, DS89C420-ENG Datasheet - Page 4

• Manufacturer Part Number: DS89C420-ENG
• Description: IC MCU ULTRA 25MHZ HP 44-TQFP
• Manufacturer: Maxim Integrated Products
• Series: 89Cr

Specifications of DS89C420-ENG

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

AC CHARACTERISTICS
(V
ALE Pulse Width (Note 2)
Port 0 Instruction Address
Valid to ALE Low
Port 2 Instruction Address
Valid to ALE Low
Port 0 Data AddressValid to
ALE Low
Program Address Hold
After ALE Low
Address Hold After ALE
Low MOVX Write
Address Hold After ALE
Low MOVX Read
ALE Low to Valid
Instruction In
ALE Low to PSEN Low
PSEN Pulse Width for
Program Fetch
CC
= 4.5V to 5.5V; T
PARAMETER
External Oscillator
External Crystal
(25MHz, 33MHz)
(25MHz, 33MHz)
A
= -40°C to +85°C)*
SYMBOL
1 / t
t
t
t
t
t
t
t
t
AVLL2
AVLL3
LLAX2
LLAX3
t
t
LHLL
AVLL
LLAX
LLPL
PLPH
LLIV
CLCL
0.5t
0.5t
0.5t
0.5t
0.5t
t
+ t
+ t
+ t
CLCL
MIN
CLCL
CLCL
CLCL
CLCL
CLCL
PAGE MODE 1
0
0
1
1
STC3
STC4
STC4
- 5
1 CYCLE
- 2
- 4
- 8
- 8
- 8
(Figure
MAX
25
33
25
33
1,
Figure
0.5t
1.5t
1.5t
1.5t
t
CLCL
t
+ t
+ t
CLCL
MIN
t
STC3
CLCL
CLCL
CLCL
CLCL
2, and
PAGE MODE 1
0
0
1
1
STC4
STC4
- 2 +
- 5
2 CYCLE
- 4
- 8
- 8
- 8
Figure
MAX
25
33
25
33
3)
4 of 47
2t
1.5t
2.5t
2.5t
2.5t
2t
CLCL
+ t
+ t
CLCL
MIN
t
CLCL
CLCL
CLCL
CLCL
STC3
PAGE MODE 1
0
0
1
1
STC4
STC4
- 4 +
- 5
4 CYCLE
- 5
- 8
- 8
- 8
MAX
25
33
25
33
1.5t
0.5t
0.5t
0.5t
0.5t
1.5t
t
CLCL
t
t
CLCL
CLCL
CLCL
CLCL
CLCL
MIN
t
t
t
t
STC3
CLCL
STC3
CLCL
STC4
STC4
CLCL
PAGE MODE 2
0
0
1
1
- 2 +
- 2
- 5
- 5 +
- 8 +
- 8 +
- 2
- 8
- 6
DS89C420 Ultra-High-Speed Microcontroller
2.5t
MAX
25
33
25
33
20
CLCL
-
1.5t
0.5t
0.5t
0.5t
0.5t
0.5t
0.5t
2t
t
CLCL
NON-PAGE MODE
CLCL
CLCL
CLCL
CLCL
CLCL
MIN
t
t
t
t
CLCL
CLCL
CLCL
STC3
STC3
STC4
STC4
0
0
1
1
- 2
- 5 +
- 2 +
- 8 +
- 8 +
- 5
- 2
- 8
- 6
2.5t
MAX
25
33
25
33
20
CLCL
-
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns