Datasheet

3
LTC1334
AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS485 Receiver (SEL1 = SEL2 = High)
V
TH
Differential Input Threshold Voltage –7V ≤ V
CM
≤ 12V, LTC1334C ● –0.2 0.2 V
–7V ≤ V
CM
≤ 7V, LTC1334I ● –0.3 0.3 V
∆V
TH
Input Hysteresis V
CM
= 0V 70 mV
I
IN
Input Current (A, B) V
IN
= –7V ● –0.8 mA
V
IN
= 12V ● 1.0 mA
R
IN
Input Resistance –7V ≤ V
IN
≤ 12V ● 12 24 kΩ
RS232 Receiver (SEL1 = SEL2 = Low)
V
TH
Receiver Input Threshold Voltage Input Low Threshold ● 0.8 V
Input High Threshold
● 2.4 V
∆V
TH
Receiver Input Hysteresis 0.6 V
R
IN
Receiver Input Resistance V
IN
= ±10V 3 5 7 kΩ
Receiver Output
V
OH
Receiver Output High Voltage I
O
= –3mA, V
IN
= 0V, SEL1 = SEL2 = Low ● 3.5 4.6 V
V
OL
Receiver Output Low Voltage I
O
= 3mA, V
IN
= 3V, SEL1 = SEL2 = Low ● 0.2 0.4 V
I
OSR
Short-Circuit Current 0V ≤ V
O
≤ V
CC
● 785mA
I
OZR
Three-State Output Current ON/OFF = Low ● ±10 µA
R
OB
Inactive “B” Output Pull-Up Resistance (Note 5) ON/OFF = High, SEL1 = SEL2 = High 50 kΩ
Power Supply Generator
V
DD
V
DD
Output Voltage No Load, ON/OFF = High 8.5 V
I
DD
= –10mA, ON/OFF = High 7.6 V
V
EE
V
EE
Output Voltage No Load, ON/OFF = High –7.7 V
I
EE
= 10mA, ON/OFF = High –6.9 V
Power Supply
I
CC
V
CC
Supply Current No Load, SEL1 = SEL2 = High ● 825 mA
No Load Shutdown, ON/OFF = 0V
● 10 100 µA
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS232 Mode (SEL1 = SEL2 = Low)
SR Slew Rate Figure 4, R
L
= 3k, C
L
= 15pF ● 30 V/µs
Figure 4, R
L
= 3k, C
L
= 1000pF ● 4V/µs
t
T
Transition Time Figure 4, R
L
= 3k, C
L
= 2500pF ● 0.22 1.9 3.1 µs
t
PLH
Driver Input to Output Figures 4, 9, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PHL
Driver Input to Output Figures 4, 9, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PLH
Receiver Input to Output Figures 5, 10 ● 0.3 6 µs
t
PHL
Receiver Input to Output Figures 5, 10 ● 0.4 6 µs
RS485 Mode (SEL1 = SEL2 = High)
t
PLH
Driver Input to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
PHL
Driver Input to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
SKEW
Driver Output to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 515 ns
t
r
, t
f
Driver Rise and Fall Time Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 31540 ns
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)