LT1485 Просмотр технического описания (PDF) - Linear Technology
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LT1485 Datasheet PDF : 12 Pages
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LTC1485
SWITCHI G CHARACTERISTICS
VCC = 5V (Notes 2, 3), unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
tPLH
Driver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF
(Figures 2, 5)
q
10
30
50
ns
tPHL
Driver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF
(Figures 2, 5)
q
10
30
50
ns
tSKEW
Driver Output to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF
(Figures 2, 5)
q
4
10
ns
tr, tf
Driver Rise or Fall Time
RDIFF = 54Ω, CL1 = CL2 = 100pF
(Figures 2, 5)
q
5
15
25
ns
t ZH
Driver Enable to Output High
CL = 100pF (Figures 4, 6) S2 Closed
q
40
70
ns
tZL
Driver Enable to Output Low
CL = 100pF (Figures 4, 6) S1 Closed
q
40
70
ns
tLZ
Driver Disable Time from Low
CL = 15pF (Figures 4, 6) S1 Closed
q
40
70
ns
t HZ
Driver Disable Time from High
CL = 15pF (Figures 4, 6) S2 Closed
q
40
70
ns
tPLH
Receiver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF (Figures 2, 7)
q
15
25
50
ns
tPHL
Receiver Input to Output
RDIFF = 54Ω, CL1 = CL2 = 100pF (Figures 2, 7)
q
20
30
55
ns
tSKEW
| tPLH – tPHL |
Differential Receiver Skew
RDIFF = 54Ω, CL1 = CL2 = 100pF (Figures 2, 7)
q
5
15
ns
tZL
Receiver Enable to Output Low
CL = 15pF (Figures 3, 8) S1 Closed
t ZH
Receiver Enable to Output High
CL = 15pF (Figures 3, 8) S2 Closed
tLZ
Receiver Disable from Low
CL = 15pF (Figures 3, 8) S1 Closed
t HZ
Receiver Disable from High
CL = 15pF (Figures 3, 8) S2 Closed
q
30
45
ns
q
30
45
ns
q
30
45
ns
q
30
45
ns
The q denotes specifications which apply over the operating temperature
range.
Note 1: Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed.
Note 2: All currents into device pins are positive. All currents out of 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Output Low Voltage vs
Output Current
36
32 TA = 25°C
28
24
20
16
12
8
4
0
0
0.5
1.0
1.5
2.0
OUTPUT VOLTAGE (V)
1485 G01
Receiver Output High Voltage vs
Output Current
–18
–16 TA = 25°C
–14
–12
–10
–8
–6
–4
–2
0
5
4
3
2
OUTPUT VOLTAGE (V)
1485 G02
Receiver Output High Voltage vs
Temperature
4.8
I = 8mA
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1485 G03
3
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