DS80C320_06 Datasheet, PDF (23/40 Pages) Maxim Integrated Products – High-Speed/Low-Power Microcontrollers

DS80C320/DS80C323 High-Speed/Low-Power Microcontrollers
AC CHARACTERISTICS—DS80C320
PARAMETER
SYMBOL
Oscillator
Frequency
External
Oscillator
External
Crystal
ALE Pulse Width
Port 0 Address Valid to
ALE Low
Address Hold After
ALE Low
Address Hold After
ALE Low for MOVX WR
ALE Low to Valid
Instruction In
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid
Instruction In
Input Instruction Hold
After PSEN
Input Instruction Float
After PSEN
Port 0 Address to Valid
Instruction In
Port 2 Address to Valid
Instruction In
PSEN Low to Address Float
1/t_CLCL
t_LHLL
t_AVLL
t_LLAX1
t_LLAX2
t_LLIV
t_LLPL
t_PLPH
t_PLIV
t_PXIX
t_PXIZ
t_AVIV1
t_AVIV2
t_PLAZ
33MHz
MIN
MAX
0
33
1
33
34
4
2
(Note 5)
6
49
0.5
61
48
0
25
64
73
(Note 5)
VARIABLE CLOCK
MIN
MAX
0
33
1
1.5t_CLCL-11
0.5t_CLCL-11
0.25t_CLCL-5
33
(Note 5)
UNITS
MHz
ns
ns
ns
0.5t_CLCL-9
ns
2.5t_CLCL-27
ns
0.25t_CLCL-7
ns
2.25t_CLCL-7
ns
2.25t_CLCL-21
ns
0
ns
t_CLCL-5
ns
3t_CLCL-27
ns
3.5t_CLCL-33
ns
(Note 5)
ns
NOTES FOR DS80C320 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% tested, but are guaranteed by design.
1. All signals rated over operating temperature at 33MHz.
2. All signals characterized with load capacitance of 80pF except Port 0, ALE, PSEN , RD and WR at 100pF.
Note that loading should be approximately equal for valid timing.
3. Interfacing to memory devices with float times (turn off times) over 30ns may cause contention. This will not
damage the parts but will cause an increase in operating current.
4. Specifications assume a 50% duty cycle for the oscillator. Port 2 timing will change with the duty cycle
variations.
5. Address is held in a weak latch until over driven by external memory.
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