LT1330 LINER [Linear Technology], LT1330 Datasheet - Page 5

• Manufacturer Part Number: LT1330
• Description: 5V RS232 Transceiver with 3V Logic Interface and One Receiver Active in Shutdown
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR
PI FU CTIO S
V
with a 0.1 F ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
V
the V
capacitor. This pin may also be connected to 5V.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Operating Mode Control.
A logic low puts the device in the low power shutdown
mode. All three drivers and four receivers (RX1, RX2, RX3,
and RX4) assume a high impedance output state in shut-
down. Only receiver RX5 remains active while the trans-
ceiver is in shutdown. The transceiver consumes only
CC
L
: 3V Logic Supply Pin for all RS232 Receivers. Like V
U
: 5V Input Supply Pin. This pin should be decoupled
L
input should be decoupled with a 0.1 F ceramic
RX5 OUTPUT
RX1 TO RX4
C
C
L
U
OUTPUT
L
= 50pF
= 50pF
INPUT
30
25
10
20
15
5
0
–55
Driver Short-Circuit Current
Receiver Output Waveforms
V
L
= 3V
–25
U
0
TEMPERATURE ( C)
W
25
A
50
U
CE
75
I
I
SC
SC
C
–
+
100
HARA TERISTICS
1330 G12
1330 G10
125
C
CC
,
DRIVER OUTPUT
DRIVER OUTPUT
60 A of supply current while in shutdown. A logic high
fully enables the transceiver.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
this pin shuts down the charge pump and places all driver
outputs in a high impedance state. All five receivers remain
active under these conditions. Floating the driver disable
pin or driving it to a logic low level fully enables the
transceiver. A logic low on the ON/OFF pin supersedes the
state of the DRIVER DISABLE pin. Supply current drops to
3mA when in driver disable mode.
V
requires an external charge storage capacitor, C 1.0 F,
tied to ground or 5V. Larger value capacitors may be used
+
C
: Positive Supply Output. V
L
= 2500pF
R
R
INPUT
L
L
= 3k
= 3k
30
25
20
40
35
15
10
5
0
–55
Receiver Short-Circuit Current
Driver Output Waveforms
–25
RX1 TO RX4
0
TEMPERATURE (°C)
RX5 I
RX5 I
I
SC –
25
SC +
SC –
50
RX1 TO RX4
I
SC +
+
75
2V
100
1330 G11
1330 G13
CC
125
– 1.5V. This pin
LT1330
5