LTC1334 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1334 Datasheet PDF : 16 Pages
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LTC1334
AC ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS485 Mode (SEL1 = SEL2 = High)
tZL
Driver Enable to Output Low
Figures 3, 7, CL = 100pF, S1 Closed
q
50
90
ns
tZH
Driver Enable to Output High
tLZ
Driver Disable from Low
Figures 3, 7, CL = 100pF, S2 Closed
q
Figures 3, 7, CL = 15pF, S1 Closed
q
50
90
ns
50
90
ns
tHZ
Driver Disable from High
Figures 3, 7, CL = 15pF, S2 Closed
q
60
90
ns
t PLH
Receiver Input to Output
Figures 2, 8, RL = 54Ω, CL = 100pF
q 20
60
140
ns
t PHL
tSKEW
Receiver Input to Output
Differential Receiver Skew, tPLH – tPHL
Figures 2, 8, RL = 54Ω, CL = 100pF
Figures 2, 8, RL = 54Ω, CL = 100pF
q 20
70
140
ns
10
ns
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 at VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF
and TA = 25°C.
Note 4: Short-circuit current for RS485 driver output low state folds back
above VCC. Peak current occurs around VO = 3V.
Note 5: The “B” RS232 receiver output is disabled in RS485 mode
(SEL1 = SEL2 = high). The unused output driver goes into a high
impedance mode and has a resistor to VCC. See Applications Information
section for more details.
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Output High Voltage
vs Temperature
5.0
4.9 IOUT = 3mA
VCC = 5V
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1334 • TPC01
Receiver Output Low Voltage
vs Temperature
0.5
IOUT = 3mA
VCC = 5V
0.4
0.3
0.2
0.1
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1334 • TPC02
RS485 Receiver Skew
tPLH – tPHL vs Temperature
20
18 VCC = 5V
16
14
12
10
8
6
4
2
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1334 • TPC03
4
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