DS83C530-DS87C530 Datasheet, PDF (34/46 Pages) Maxim Integrated Products – EPROM/ROM Microcontrollers with Real-Time Clock

DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
AC ELECTRICAL CHARACTERISTICS (Note 1)
PARAMETER
33MHz
SYMBOL
MIN MAX
Oscillator
Frequency
External Oscillator
0
1/t_CLCL
External Crystal
1
33
33
ALE Pulse Width
t_LHLL
40
Port 0 Address Valid to ALE Low
t_AVLL
10
Address Hold after ALE Low
t_LLAX1 (Note 2)
ALE low to Valid Instruction In
t_LLIV
43
ALE Low to PSEN Low
t_LLPL
4
PSEN Pulse Width
t_PLPH
55
PSEN Low to Valid Instruction In
t_PLIV
37
Input Instruction Hold after PSEN
t_PXIX
0
Input Instruction Float after PSEN
t_PXIZ
26
Port 0 Address to Valid Instruction In t_AVIV1
59
Port 2 Address to Valid Instruction In t_AVIV2
68
PSEN Low to Address Float
t_PLAZ
(Note 2)
VARIABLE CLOCK
MIN
MAX
0
33
1
33
1.5t_CLCL-5
0.5t_CLCL-5
(Note 2)
0.5t_CLCL-11
2t_CLCL-5
0
2.5t_CLCL-33
2t_CLCL-24
t_CLCL-5
3t_CLCL-32
3.5t_CLCL-38
(Note 2)
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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.
34 of 46