Datasheet
4
LTC1338
TYPICAL PERFOR A CE CHARACTERISTICS
WU
V
CC
Supply Current Driver Leakage in Shutdown Driver Short-Circuit Current
TEMPERATURE (°C)
–40
SUPPLY CURRENT (mA)
20
25
30
20 60
LTC1338 • TPC04
15
10
–20 0
40 80 100
5
0
5 DRIVERS LOADED
R
L
= 3k
1 DRIVER LOADED
R
L
= 3k
TEMPERATURE (°C)
–40
0
SHORT-CIRCUIT CURRENT (mA)
4
8
10
12
40
20
LTC1338 • TPC06
6
080
14
16
18
–20
60
20 100
I
SC
+
I
SC
–
TEMPERATURE (°C)
–40
0
LEAKAGE CURRENT (µA)
20
50
0
40
60
LTC1338 • TPC05
10
40
30
–20
20
80
100
V
OUT
= –20V
V
OUT
= 20V
Receiver Short-Circuit Current Driver Output Waveforms Receiver Output Waveforms
TEMPERATURE (°C)
–40
10
SHORT-CIRCUIT CURRENT (mA)
30
60
0
40
60
LTC1338 • TPC07
20
50
40
–20
20
80
100
I
SC
–
I
SC
+
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
DRIVER
OUTPUT
R
L
= 3k
INPUT
LTC1338 • TPC08 LTC1338 • TPC09
RECEIVER
OUTPUT
C
L
= 50pF
INPUT
PI FU CTIO S
U
UU
V
CC
: 5V Input Supply Pin. Supply current less than 0.2µA
in the SHUTDOWN mode. This pin should be decoupled
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
RECEIVER ENABLE: TTL/CMOS Compatible Enable Pin.
Refer to Table 1 for its functional description. This pin can
not float.
DRIVER ENABLE: TTL/CMOS Compatible Enable Pin. Re-
fer to Table 1 for its functional description. This pin can not
float.
V
+
: Positive Supply Output (RS232 Drivers). V
+
≅ 2V
CC
–
1V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or 5V.
With multiple devices, the V
+
and V
–
pins may be paral-
leled into common capacitors. For large numbers of
devices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V
–
: Negative Supply Output (RS232 Drivers). V
–
≅ 2V
CC
– 1.5V. This pin requires an external capacitor C = 0.1µF for
charge storage.
C1
+
, C1
–
, C2
+
, C2
–
: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1µF: one from
C1
+
to C1
–
, and another from C2
+
to C2
–
. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.