參數(shù)資料
型號： DS87C550-QNL
廠商： Maxim Integrated Products
文件頁數(shù)： 35/49頁
文件大?。?/td> 0K
描述： IC MCU EPROM ADC/PWM HS 68-PLCC
標準包裝： 18
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 33MHz
連通性： EBI/EMI，SIO，UART/USART
外圍設備： 電源故障復位，PWM，WDT
輸入/輸出數(shù)： 55
程序存儲器容量： 8KB（8K x 8）
程序存儲器類型： OTP
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線）
包裝： 管件
DS87C550 EPROM High-Speed Microcontroller with ADC and PWM
40 of 49
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. 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 Start-up Time
tCSU
1.8
ms
1
Power-on Reset Delay
tPOR
65536
tCLCL
2
NOTES FOR POWER CYCLE TIMING CHARACTERISTICS
1. Start-up time for crystals varies with load capacitance and manufacturer. Time shown is for an 11.0592MHz
crystal manufactured by Fox.
2. Reset delay is a synchronous counter of crystal oscillations after crystal start-up. At 33MHz, this time is 1.99
ms.
EPROM PROGRAMMING AND VERIFICATION
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS NOTES
Programming Voltage
VPP
12.5
13.0
V
1
Programming Supply Current
IPP
75
mA
Oscillator Frequency
1/tCLCL
4
6
MHz
POR Delay
tDELAY
65536
tCLCL
2
Address Setup to PROG Low
tAVGL
48tCLCL
Address Hold after PROG
tGHAX
48tCLCL
Data Setup to PROG Low
tDVGL
48tCLCL
Data Hold after PROG
tGHDX
48tCLCL
Enable High to VPP
tEHSH
48tCLCL
VPP Setup to PROG Low
tSHGL
10
s
VPP Hold after PROG
tGHSL
10
s
PROG
Width
tGLGH
90
110
s
Address to Data Valid
tAVQV
48tCLCL
Enable Low to Data Valid
tELQV
48tCLCL
Data Float after Enable
tEHQZ
0
48tCLCL
PROG
High to PROG Low
tGHGL
10
s
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 4MHz oscillator frequency,
this period is 16.4ms.
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