參數(shù)資料
型號： LTC1685
廠商： Linear Technology Corporation
英文描述： 52Mbps, Precision Delay, RS485 Fail-Safe Transceiver
中文描述： 52Mbps的，精密延遲，485失效保護(hù)器
文件頁數(shù)： 3/12頁
文件大?。?/td> 269K
代理商： LTC1685
3
LTC1685
DC ELECTRICAL CHARACTERISTICS
V
DD
= 5V
±
5%, unless otherwise noted. (Notes 2, 3)
SYMBOL
R
IN
C
IN
PARAMETER
Input Resistance
Input Capacitance
Open-Circuit Input Voltage, Figure 5
Time to Detect Fail-Safe Condition
CONDITIONS
–7V
≤
V
CM
≤
12V
A, B Inputs, D, DE, RE
V
DD
= 5V (Note 4)
MIN
22
TYP
MAX
UNITS
G
k
pF
3
G
3.2
3.3
2
3.4
V
Fail-Safe
Time
CMRR
μ
s
Receiver Input Common Mode
Rejection Ratio
Receiver and Driver Output
Load Capacitance
V
CM
= 2.6V, f = 26MHz
45
dB
C
LOAD
(Note 4)
G
500
pF
V
DD
= 5V, unless otherwise noted. (Notes 2, 3)
SWITCHI
G CHARACTERISTICS
U
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
All currents into the device pins are positive; all currents out of the
device pins are negative.
Note 3:
All typicals are given for V
DD
= 5V, T
A
= 25
°
C.
Note 4:
Guaranteed by design, but not tested.
Note 5:
Short-circuit current does not represent output drive capability.
When the output detects a short-circuit condition, output drive current is
significantly reduced (from hundreds of mA to 20mA max) until the short
is removed.
SYMBOL
t
PLH
, t
PHL
PARAMETER
Driver Input-to-Output Propagation Delay
CONDITIONS
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
Figures 3, 5
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
Figures 3, 5
R
DIFF
= 54
, C
L1
= C
L2
= 100pF,
Figures 3, 5
C
L
= 100pF, S2 Closed, Figures 4, 6
C
L
= 100pF, S1 Closed, Figures 4, 6
C
L
= 15pF, S1 Closed, Figures 4, 6
C
L
= 15pF, S2 Closed, Figures 4, 6
C
L
= 15pF, Figures 3, 7
C
L
= 15pF, Figures 3, 7
C
L
= 15pF, S1 Closed, Figures 2, 8
C
L
= 15pF, S2 Closed, Figures 2, 8
C
L
= 15pF, S1 Closed, Figures 2, 8
C
L
= 15pF, S2 Closed, Figures 2, 8
(Note 4)
MIN
15
TYP
18.5
MAX
22
UNITS
G
ns
t
SKEW
Driver Output A-to-Output B Skew
500
ps
t
r
, t
f
Driver Rise/Fall Time
3.5
ns
t
ZH
t
ZL
t
LZ
t
HZ
t
PLH
, t
PHL
t
SQD
t
ZL
t
ZH
t
LZ
t
HZ
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Low
Driver Disable from High
Receiver Input-to-Output Propagation Delay
Receiver Skew
t
PLH
– t
PHL
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
Maximum Receiver Input
Rise/Fall Times
Package-to-Package Skew
Minimum Input Pulse Width
Maximum Data Rate
Maximum Input Frequency
G
25
25
25
25
18.5
500
25
25
25
25
50
50
50
50
22
ns
ns
ns
ns
ns
ps
ns
ns
ns
ns
ns
G
G
G
G
15
G
50
50
50
50
2000
G
G
G
G
t
PKG-PKG
Same Temperature (Note 4)
V
DD
= 5V
±
5% (Note 4)
V
DD
= 5V
±
5% (Note 4)
V
DD
= 5V
±
5% (Note 4)
1.5
17
60
30
ns
ns
G
19.2
G
52
26
Mbps
MHz
G
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