4
LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Currents
I
CC
V
CC
Supply Current No Load (SEL1 = SEL2 = HIGH) ● 1000 2000 µA
Shutdown, ON/OFF = 0V ● 15 50 µA
I
DD
V
DD
Supply Current (LTC1321/LTC1322) No Load (SEL1 = SEL2 = LOW) ● 300 1000 µA
Shutdown, ON/OFF = 0V ● 0.1 50 µA
I
EE
V
EE
Supply Current No Load (SEL1 = SEL2 = HIGH) ● –1000 –2000 µA
Shutdown, ON/OFF = 0V ● –0.1 –50 µA
DC ELECTRICAL CHARACTERISTICS
V
CC
= V
DD
(LTC1321/LTC1322) = 5V ±5%, V
EE
= –5V ±5% (Notes 2, 3)
AC
V
CC
= V
DD
(LTC1321/LTC1322) = 5V ±5%, V
EE
= –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
EIA/TIA-562 Mode (SEL1 = SEL2 = LOW)
SR Slew Rate Figure 4, R
L
= 3k, C
L
= 15pF ● 14 30 V/µs
Figure 4, R
L
= 3k, C
L
= 1000pF ● 47 V/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 4,10, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PHL
Driver Input to Output Figures 4,10, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PLH
Receiver Input to Output Figures 5,11 ● 0.3 6 µs
t
PHL
Receiver Input to Output Figures 5,11 ● 0.4 6 µs
RS485 Mode (SEL1 = SEL2 = HIGH)
t
PLH
Driver Input to Output Figures 2,7, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
PHL
Driver Input to Output Figures 2,7, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
SKEW
Driver Output to Output Figures 2,7, R
L
= 54Ω, C
L
= 100pF ● 515 ns
t
r
, t
f
Driver Rise or Fall Time Figures 2,7, R
L
= 54Ω, C
L
= 100pF ● 31540 ns
t
ZL
Driver Enable to Output Low Figures 3,8, C
L
= 100pF, S1 Closed ● 50 90 ns
t
ZH
Driver Enable to Output High Figures 3,8, C
L
= 100pF, S2 Closed ● 50 90 ns
t
LZ
Driver Disable from Low Figures 3,8, C
L
= 15pF, S1 Closed ● 50 90 ns
t
HZ
Driver Disable from High Figures 3,8, C
L
= 15pF, S2 Closed ● 60 90 ns
t
PLH
Receiver Input to Output Figures 2,9, R
L
= 54Ω, C
L
= 100pF ● 20 60 140 ns
t
PHL
Receiver Input to Output Figures 2,9, R
L
= 54Ω, C
L
= 100pF ● 20 70 140 ns
t
SKEW
Differential Receiver Skew, t
PLH
-t
PHL
Figures 2,9, R
L
= 54Ω, C
L
= 100pF ● 10 ns
Receiver Output Enable/Disable (LTC1335)
t
ZL
Receiver Enable to Output Low Figures 6,12, C
L
= 15pF, S1 Closed ● 40 90 ns
t
ZH
Receiver Enable to Output High Figures 6,12, C
L
= 15pF, S2 Closed ● 40 90 ns
t
LZ
Receiver Disable from Low Figures 6,12, C
L
= 15pF, S1 Closed ● 40 90 ns
t
HZ
Receiver Disable from High Figures 6,12, C
L
= 15pF, S2 Closed ● 50 90 ns
The
● denotes specifications which apply over the full 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 at V
CC
= V
DD
(LTC1321/LTC1322) = 5V,
V
EE
= –5V, and T
A
= 25°C.
Note 4: Short-circuit current for RS485 driver output low state folds back
above V
CC
. Peak current occurs around V
O
= 3V.
