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AT89LS51 датащи(PDF) 14 Page - ATMEL Corporation

номер детали AT89LS51
подробное описание детали  8-Bit Microcontroller with 4K Bytes Flash
PDF  16 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LS51 датащи(HTML) 14 Page - ATMEL Corporation

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Serial Port Timing: Shift Register Mode Test Conditions
(VCC = 2.7V to 6V; Load Capacitance = 80 pF)
Shift Register Mode Timing Waveforms
AC Testing Input/Output Waveforms (1)
Note:
1.
AC inputs during testing are driven at 2.4V for a
logic “1” and 0.45V for a logic “0”. Timing measure-
ments are made at 2.0V for a logic “1” and 0.8V for a
logic “0”.
Float Waveforms (1)
Note:
1.
For timing purposes, a port pin is no longer floating
when a 100 mV change from load voltage occurs. A
port pin begins to float when a 100 mV change from
the loaded VOH/VOL level occurs.
Symbol
Parameter
12 MHz Osc
Variable Oscillator
Units
Min
Max
Min
Max
tXLXL
Serial Port Clock Cycle Time
1.0
12tCLCL
µs
tQVXH
Output Data Setup to Clock Rising Edge
700
10tCLCL-133
ns
tXHQX
Output Data Hold After Clock Rising Edge
50
2tCLCL-117
ns
tXHDX
Input Data Hold After Clock Rising Edge
0
0
ns
tXHDV
Clock Rising Edge to Input Data Valid
700
10t CLCL-133
ns
t
XHDV
t
QVXH
t
XLXL
t
XHDX
t
XHQX
ALE
INPUT DATA
CLEAR RI
OUTPUT DATA
WRITE TO SBUF
INSTRUCTION
CLOCK
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
SET TI
SET RI
8
VALID
VALID
VALID
VALID
VALID
VALID
VALID
VALID
0.45V
TEST POINTS
V
- 0.5V
CC
0.2 V
+ 0.9V
CC
0.2 V
- 0.1V
CC
V
LOAD
+ 0.1V
Timing Reference
Points
V
LOAD
- 0.1V
LOAD
V
V
OL
+ 0.1V
V
OL
- 0.1V



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