Maxim DS87C530 Clock User Manual


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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
38 of 47
EXPLANATION OF AC SYMBOLS
In an effort to remain compatible with the original 8051 family, this device specifies the same parameters
as such devices, using the same symbols. For completeness, the following is an explanation of the
symbols.
t Time
A Address
C Clock
D Input data
H Logic level high
L Logic level low
I Instruction
P PSEN
Q Output data
R RD signal
V Valid
W WR signal
X No longer a valid logic
level
Z Tri-State
POWER-CYCLE TIMING CHARACTERISTICS
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Cycle Startup Time t
CSU
1.8 ms 1
Power-On Reset Delay t
POR
65,536 t
CLCL
2
Note 1: Startup time for crystals varies with load capacitance and manufacturer. Time shown is for an 11.0592MHz crystal manufactured by
Fox.
Note 2:
Reset delay is a synchronous counter of crystal oscillations after crystal startup. At 33MHz, this time is 1.99ms.
EPROM PROGRAMMING AND VERIFICATION
(V
CC
= 4.5V to 5.5V, T
A
= +21°C to +27°C.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Programming Voltage V
PP
12.5 13.0 V 1
Programming Supply Current I
PP
50 mA
Oscillator Frequency 1/t
CLCL
4 6 MHz
Address Setup to PROG Low
t
AVGL
48t
CLCL
Address Hold after PROG
t
GHAX
48t
CLCL
Data Setup to PROG Low
t
DVGL
48t
CLCL
Data Hold after PROG
t
GHDX
48t
CLCL
Enable High to V
PP
t
EHSH
48t
CLCL
V
PP
Setup to PROG Low
t
SHGL
10
ms
V
PP
Hold after PROG
t
GHSL
10
ms
PROG Width
t
GLGH
90 110
ms
Address to Data Valid t
AVQV
48t
CLCL
Enable Low to Data Valid t
ELQV
48t
CLCL
Data Float after Enable t
EHQZ
0 48t
CLCL
PROG High to PROG Low
t
GHGL
10
ms
Note 1: All voltages are referenced to ground.
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