Maxim DS87C530 Clock User Manual


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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
35 of 47
AC ELECTRICAL CHARACTERISTICS (Note 1)
33MHz VARIABLE CLOCK
PARAMETER SYMBOL
MIN MAX MIN MAX
UNITS
External Oscillator 0 33 0 33
Oscillator
Frequency
External Crystal
1/t
CLCL
1 33 1 33
MHz
ALE Pulse Width t
LHLL
40 1.5t
CLCL
-5 ns
Port 0 Address Valid to ALE Low t
AVLL
10 0.5t
CLCL
-5 ns
Address Hold after ALE Low t
LLAX1
(Note 2) (Note 2) ns
ALE low to Valid Instruction In t
LLIV
43 2.5t
CLCL
-33 ns
ALE Low to PSEN Low
t
LLPL
4 0.5t
CLCL
-11 ns
PSEN Pulse Width
t
PLPH
55 2t
CLCL
-5 ns
PSEN Low to Valid Instruction In
t
PLIV
37 2t
CLCL
-24 ns
Input Instruction Hold after PSEN
t
PXIX
0 0 ns
Input Instruction Float after PSEN
t
PXIZ
26 t
CLCL
-5 ns
Port 0 Address to Valid Instruction In t
AVIV1
59 3t
CLCL
-32 ns
Port 2 Address to Valid Instruction In t
AVIV2
68 3.5t
CLCL
-38 ns
PSEN Low to Address Float
t
PLAZ
(Note 2) (Note 2) ns
Note 1:
All parameters apply to both commercial and industrial temperature range operation unless otherwise noted. Specifications to
-40°C are guaranteed by design and are not production tested. AC electrical characteristics are not 100% tested, but are
characterized and guaranteed by design. All signals are characterized with load capacitance of 80pF except Port 0, ALE, PSEN, RD
and WR with 100pF. Interfacing to memory devices with float times (turn off times) over 25ns may cause contention. This will not
damage the parts, but will cause an increase in operating current. Specifications assume a 50% duty cycle for the oscillator. Port 2
and ALE timing will change in relation to duty cycle variation.
Note 2:
Address is driven strongly until ALE falls, and is then held in a weak latch until overdriven externally.
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