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LTC485CS8 数据表(PDF) 3 Page - Linear Technology

部件名 LTC485CS8
功能描述  Low Power RS485 Interface Transceiver
PDF  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC485CS8 数据表(HTML) 3 Page - Linear Technology

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LTC485
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tPLH
Driver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
10
30
50
ns
tPHL
Driver Input to Output
(Figures 3 and 5)
q
10
30
50
ns
tSKEW
Driver Output to Output
q
510ns
tr, tf
Driver Rise or Fall Time
q
315
25
ns
tZH
Driver Enable to Output High
CL = 100pF (Figures 4 and 6) S2 Closed
q
40
70
ns
tZL
Driver Enable to Output Low
CL = 100pF (Figures 4 and 6) S1 Closed
q
40
70
ns
tLZ
Driver Disable Time from Low
CL = 15pF (Figures 4 and 6) S1 Closed
q
40
70
ns
tHZ
Driver Disable Time from High
CL = 15pF (Figures 4 and 6) S2 Closed
q
40
70
ns
tPLH
Receiver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF,
q
30
90
200
ns
tPHL
(Figures 3 and 7)
q
30
90
200
ns
tSKD
tPLH – tPHLDifferential Receiver Skew
q
13
ns
tZL
Receiver Enable to Output Low
CRL = 15pF (Figures 2 and 8) S1 Closed
q
20
50
ns
tZH
Receiver Enable to Output High
CRL = 15pF (Figures 2 and 8) S2 Closed
q
20
50
ns
tLZ
Receiver Disable from Low
CRL = 15pF (Figures 2 and 8) S1 Closed
q
20
50
ns
tHZ
Receiver Disable from High
CRL = 15pF (Figures 2 and 8) S2 Closed
q
20
50
ns
SWITCHI G CHARACTERISTICS V
CC = 5V ±5%, unless otherwise noted. (Notes 2 and 3)
3V
DE
A
B
DI
RDIFF
CL1
CL2
RO
15pF
A
B
RE
LTC485 • F03
OUTPUT
UNDER TEST
CL
S1
S2
VCC
500
Ω
LTC485 • F02
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2
RECEIVER
OUTPUT
CRL
15pF
1k
S1
S2
TEST POINT
VCC
1k
LTC485 • F02
VOD
A
B
R
R
VOC
LTC485 • F01
Figure 1. Driver DC Test Load
Figure 2. Receiver Timing Test Load
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those beyond which the safety of
the device cannot be guaranteed.
Note 2: All currents into device pins are positive; all currents out ot device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: All typicals are given for VCC = 5V and TA = 25°C.
Note 4: The LTC485 is guaranteed by design to be functional over a supply
voltage range of 5V
±10%. Data sheet parameters are guaranteed over the
tested supply voltage range of 5V
±5%.
TEST CIRCUITS



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