DS87C550 Datasheet, PDF (41/50 Pages) Dallas Semiconductor – EPROM High-Speed Micro with A/D and PWM

POWER CYCLE TIMING CHARACTERISTICS
PARAMETER
SYMBOL MIN
Cycle Start-up Time
t_CSU
Power-on Reset Delay
t_POR
TYP
1.8
DS87C550
MAX
65536
UNITS NOTES
ms
1
t_CLCL
2
NOTES FOR POWER CYCLE TIMING CHARACTERISTICS
1. Start-up time for crystals varies with load capacitance and manufacturer. Time shown is for an
11.0592 MHz crystal manufactured by Fox.
2. Reset delay is a synchronous counter of crystal oscillations after crystal start-up. At 33 MHz, this time
is 1.99 ms.
EPROM PROGRAMMING AND VERIFICATION
PARAMETER
SYMBOL MIN
Programming Voltage
Programming Supply Current
Oscillator Frequency
POR Delay
Address Setup to PROG Low
Address Hold after PROG
Data Setup to PROG Low
Data Hold after PROG
Enable High to V_PP
V_PP Setup to PROG Low
V_PP Hold after PROG
PROG Width
Address to Data Valid
Enable Low to Data Valid
Data Float after Enable
PROG High to PROG Low
V_PP
I_PP
1/t_CLCL
t_DELAY
t_AVGL
t_GHAX
t_DVGL
t_GHDX
t_EHSH
t_SHGL
t_GHSL
t_GLGH
t_AVQV
t_ELQV
t_EHQZ
t_GHGL
12.5
4
65536
48t_CLCL
48t_CLCL
48t_CLCL
48t_CLCL
48t_CLCL
10
10
90
0
10
TYP
MAX
13.0
75
6
UNITS
V
mA
MHz
t_CLCL
NOTES
1
2
µs
µs
110
µs
48t_CLCL
48t_CLCL
48t_CLCL
µs
NOTES FOR EPROM PROGRAMMING AND VERIFICATION
1. All voltage referenced to ground.
2. The microcontroller holds itself in reset for this duration when power is applied. No signals should be
manipulated during this interval since the microcontroller is ignoring inputs. At a 4 MHz oscillator
frequency, this period is 16.4 ms.
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