
4
LTC1337
1337fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
VCC Supply Current
TEMPERATURE (°C)
0
LEAKAGE
CURRENT
(
A)
60
45
40
35
30
25
20
15
10
5
0
1337 G05
20
70
10
30
40
50
VOUT = –20V
VOUT = 20V
TEMPERATURE (°C)
0
SUPPLY
CURRENT
(mA)
60
20
16
14
12
10
8
6
4
2
0
1337 G04
20
70
10
30
40
50
3 DRIVERS LOADED
RL = 3k
1 DRIVER LOADED
RL = 3k
Driver Short-Circuit Current
Driver Leakage in Shutdown
Receiver Short-Circuit Current
Driver Output Waveforms
INPUT
DRIVER
OUTPUT
RL = 3k
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
Receiver Output Waveforms
RX
OUTPUT
CL = 50pF
INPUT
TEMPERATURE (°C)
0
SHORT-CIRCUIT
CURRENT
(mA)
60
20
18
16
14
12
10
8
6
4
2
1337 G06
20
70
10
30
40
50
ISC
+
ISC
–
TEMPERATURE (°C)
0
SHORT-CIRCUIT
CURRENT
(mA)
60
55
50
45
40
35
30
25
20
15
10
1337 G07
20
70
10
30
40
50
ISC
+
ISC
–
UU
U
PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 1A in
the Shutdown mode. This pin should be decoupled with a
0.1F ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode which reduces
input supply current to less than 1A and places all drivers
and receivers in high impedance state. This pin cannot
float.
V+: Positive Supply Output (RS232 Drivers). V+ 2VCC –
1V. This pin requires an external capacitor C = 0.1F 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– (2VCC
–1.5V). This pin requires an external capacitor C = 0.1F
for charge storage.
C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1F. 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 50.