2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9 and 65,536 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY
TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS
(1)
Commercial
IDT7203L12
IDT7204L12
IDT7205L12
(Commercial: V
CC
= 5V ± 10%, T
A
= 0°C to +70°C; Industrial: V
CC
= 5V ± 10%, T
A
= –40°C to +85°C; Military: V
CC
= 5V ± 10%, T
A
= –55°C to +125°C)
Com'l & Ind'l
IDT7203L15
(2)
IDT7204L15
(2)
IDT7205L15
(2)
IDT7206L15
IDT7207L15
Min.
—
25
—
10
15
5
5
5
—
25
15
10
11
0
25
15
15
10
25
15
15
10
—
—
—
—
—
15
—
—
—
—
15
—
—
15
10
10
Max.
40
—
15
—
—
—
—
—
15
—
—
—
—
—
—
—
—
—
—
—
—
—
25
25
25
15
15
—
15
15
25
25
—
15
15
—
—
—
Com'l & Military
IDT7203L20
IDT7204L20
IDT7205L20
IDT7206L20
IDT7207L20
Min.
—
30
—
10
20
5
5
5
—
30
20
10
12
0
30
20
20
10
30
20
20
10
—
—
—
—
—
20
—
—
—
—
20
—
—
20
10
10
Max.
33.3
—
20
—
—
—
—
—
15
—
—
—
—
—
—
—
—
—
—
—
—
—
30
30
30
20
20
—
20
20
30
30
—
20
20
—
—
—
Commercial
IDT7208L20
Com'l & Ind'l
IDT7203L25
(2)
IDT7204L25
(2)
IDT7205L25
(2)
IDT7206L25
(3)
IDT7207L25
(3)
IDT7208L25
(3)
Min.
—
35
—
10
25
5
5
5
—
35
25
10
15
0
35
25
25
10
35
25
25
10
—
—
—
—
—
25
—
—
—
—
25
—
—
25
10
10
Max.
28.5
—
25
—
—
—
—
—
18
—
—
—
—
—
—
—
—
—
—
—
—
—
35
35
35
25
25
—
25
25
35
35
—
25
25
—
—
—
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Symbol
f
S
t
RC
t
A
t
RR
t
RPW
t
RLZ
t
WLZ
t
DV
t
RHZ
t
WC
t
WPW
t
WR
t
DS
t
DH
t
RSC
t
RS
t
RSS
t
RTR
t
RTC
t
RT
t
RTS
t
RTR
t
EFL
t
HFH
, t
FFH
t
RTF
t
REF
t
RFF
t
RPE
t
WEF
t
WFF
t
WHF
t
RHF
t
WPF
t
XOL
t
XOH
t
XI
t
XIR
t
XIS
Parameters
Shift Frequency
Read Cycle Time
Access Time
Read Recovery Time
Read Pulse Width
(4)
Read LOW to Data Bus LOW
(5)
Write HIGH to Data Bus Low-Z
(5,6)
Data Valid from Read HIGH
Read HIGH to Data Bus High-Z
(5)
Write Cycle Time
Write Pulse Width
(4)
Write Recovery Time
Data Set-up Time
Data Hold Time
Reset Cycle Time
Reset Pulse Width
(4)
Reset Set-up Time
(5)
Reset Recovery Time
Retransmit Cycle Time
Retransmit Pulse Width
(4)
Retransmit Set-up Time
(5)
Retransmit Recovery Time
Reset to
EF
LOW
Reset to
HF
and
FF
HIGH
Retransmit LOW to Flags Valid
Read LOW to
EF
LOW
Read HIGH to
FF
HIGH
Read Pulse Width after
EF
HIGH
Write HIGH to
EF
HIGH
Write LOW to
FF
LOW
Write LOW to
HF
Flag LOW
Read HIGH to
HF
Flag HIGH
Write Pulse Width after
FF
HIGH
Read/Write LOW to
XO
LOW
Read/Write HIGH to
XO
HIGH
XI
Pulse Width
(4)
XI
Recovery Time
XI
Set-up Time
Min.
—
20
—
8
12
3
3
5
—
20
12
8
9
0
20
12
12
8
20
12
12
8
—
—
—
—
—
12
—
—
—
—
12
—
—
12
8
8
Max.
50
—
12
—
—
—
—
—
12
—
—
—
—
—
—
—
—
—
—
—
—
—
12
17
20
12
14
—
12
14
17
17
—
12
12
—
—
—
Min.
—
30
—
10
20
5
5
5
—
30
20
10
12
0
30
20
20
10
30
20
20
10
—
—
—
—
—
20
—
—
—
—
20
—
—
20
10
10
Max.
33.3
—
20
—
—
—
—
—
15
—
—
—
—
—
—
—
—
—
—
—
—
—
30
30
30
20
20
—
20
20
30
30
—
20
20
—
—
—
NOTES:
1. Timings referenced as in AC Test Conditions.
2. Industrial temperature range product for 15ns and 25ns speed grades are available as a standard device.
3. Industrial temperature range product for 25ns speed grade only is available as a standard device. All other speed grades are available by special order.
4. Pulse widths less than minimum are not allowed.
5. Values guaranteed by design, not currently tested.
在利用定时器A模拟串口的时候,有这样一个函数
;-----------------------------------------------------------------------------
TX_Byte; Subroutine that will TX Byte from RXTXData ......
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