DS89C420-ENG Maxim Integrated Products, DS89C420-ENG Datasheet - Page 8

• 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: -

Figure 2. Page-Mode 1 Timing
Figure 3. Page-Mode 2 Timing
XTAL1
PSEN
Port 0
Port 2
XTAL1
ALE
RD
WR
PSEN
Port 0
Port 2
ALE
RD
WR
LSB
OPCODE
t
MSB
AVIV2
t
t
t
LSB
AVLL
AVLL2
LLIV
t
CLCL
t
LSB
t
CLCL
t
PXIX
LLAX
MOVX
OPCODE
t
LLPL
t
PLIV
t
AVLL2
LSB
MOVX
t
AVIV0
LSB
MOVX
t
PXIZ
MSB
t
PLPH
LSB
MOVX
t
LHLL
t
t
LLAX3
t
t
RHDX
LSB
LLWL
RLRH
t
t
DATA
RLDV
AVDV2
8 of 47
t
t
AVDV0
AVDV2
MSB
t
LLDV
t
t
LHLL
MSB
LSB
AVLL3
t
t
RLRH
AVWL2
t
DATA
LLAX3
t
RLDV
t
t
t
LSB
PLPH
LLAX
PXIX
t
OPCODE
t
t
RHDX
PLAZ
RHDZ
t
MSB
PLIV
t
AVIV2
MSB
LSB
t
AVWL0
OPCODE
LSB
t
t
t
LLAX2
QVWX
AVWL2
DATA
t
WLWH
MSB
MSB
t
t
t
WHLH
t
WLWH
LSB
WHQX
WHLH
t
LLWL
t
t
WHQX
LLAX2
t
QVWX
DATA