DS80C320-MCG+ Dallas Semiconductor, DS80C320-MCG+ Datasheet - Page 27

• Manufacturer Part Number: DS80C320-MCG+
• Description: Microcontroller, 8051 Comp., 4 8-Bit I/O Ports, 64K ROM/RAM, 25 MHz, 5 V, PDIP40
• Manufacturer: Dallas Semiconductor

Specifications of DS80C320-MCG+

• Eeprom Memory: 0 Bytes
• Input Output: 32
• Interface: UART
• Memory Type: ROMless
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 0 Bytes
• Ram Size: 256 Bytes
• Speed: 25 MHz
• Timers: 3-16-bit
• Voltage, Range: 4.25-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

AC ELECTRICAL CHARACTERISTICS—DS80C323
NOTES FOR DS80C323 AC ELECTRICAL CHARACTERISTICS
All parameters apply to both commercial and industrial temperature operation unless otherwise noted. Specifications to -40°C
are guaranteed by design and are not production tested. AC electrical characteristics assume 50% duty cycle for the oscillator,
oscillator frequency > 16MHz, and are not 100% production tested, but are guaranteed by design.
1. All signals rated over operating temperature at 18MHz.
2. All signals characterized with load capacitance of 80pF except Port 0, ALE,
3. Interfacing to memory devices with float times (turn off times) over 35ns may cause contention. This will not
4. Specifications assume a 50% duty cycle for the oscillator. Port 2 timing will change with the duty cycle
5.
Oscillator
Frequency
ALE Pulse Width
Port 0 Address Valid
to ALE Low
Address Hold After
ALE Low
Address Hold After
ALE Low for MOVX
ALE Low to Valid
Instruction In
ALE Low to
Instruction In
Input Instruction Hold
After
Input Instruction Float
After
Port 0 Address to Valid
Instruction In
Port 2 Address to Valid
Instruction In
PSEN
PSEN
PSEN
Note that loading should be approximately equal for valid timing.
damage the parts, but will cause an increase in operating current.
variations.
Address is held in a weak latch until over-driven by external memory.
PARAMETER
PSEN
PSEN
Pulse Width
Low to Valid
Low to Address Float
PSEN
External
Oscillator
External
Crystal
Low
WR
SYMBOL
1/t
t
t
t
t
t
t
t
t
t
LLAX1
LLAX2
t
t
t
t
AVIV1
AVIV2
AVLL
LHLL
PLAZ
LLPL
PLPH
PXIX
LLIV
PLIV
PXIZ
CLCL
MIN
118
68
16
14
0
1
6
4
0
18 MHz
27 of 40
(Note 5)
(Note 5)
MAX
128
139
18
18
93
87
51
0.25t
1.5t
0.5t
0.5t
0.25t
2.25t
VARIABLE CLOCK
MIN
CLCL
CLCL
CLCL
CLCL
0
1
0
CLCL
CLCL
-15
-11
-13
-10
-8
-7
PSEN
,
2.25t
2.5t
3.5t
3t
RD
(Note 5)
(Note 5)
t
MAX
CLCL
CLCL
CLCL
CLCL
18
18
CLCL
, and
-5
-39
-46
-56
-38
WR
UNITS
at 100pF.
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns