LT1138ACNW Linear Technology, LT1138ACNW Datasheet - Page 7

• Manufacturer Part Number: LT1138ACNW
• Description: IC 5DRV/3RCV RS232 5V 28-DIP
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LT1138ACNW

• Number Of Drivers/receivers: 5/3
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LT1138ACN

TYPICAL PERFOR
PI FU CTIO S
V
the shutdown mode. This pin should be decoupled with a
0.1 F ceramic capacitor close to the package pin. Insuffi-
cient supply bypassing can result in low output drive levels
and erratic charge pump operation.
GND: Ground Pin.
ON/OFF: Control the operation mode of the device and is
TTL/CMOS compatible. A logic low puts the device in the
shutdown mode which reduces input supply curent to zero
and places all of the drivers and receivers in high imped-
ance state. 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 drivers
CC
U
OUTPUT HIGH
: 5V Input Supply Pin. Supply current drops to zero in
OUTPUT LOW
ON/OFF PIN
DRIVER
DRIVER
R
R
L
L
= 3k
= 3k
U
– 10
– 5
10
30
25
20
15
10
5
0
0
5
–55
Driver Short-Circuit Current
Shutdown to Driver Output
–25
U
0
TEMPERATURE (°C)
W
25
A
50
U
CE
75
ISC
ISC
LT1137A • TPC10
C
+
–
100
LT1137A • TPC12
HARA TERISTICS
125
C
DRIVER OUTPUT
DRIVER OUTPUT
in a high impedance state. 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 4mA when
in driver disable mode.
V
1.5V. This pin requires an external charge storage capaci-
tor C 1.0 F, tied to ground or V
tors may be used to reduce supply ripple. With multiple
transceivers, the V
common capacitors. For large numbers of transceivers,
increasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
+
C
: Positive Supply Output (RS232 Drivers). V
L
= 2500pF
R
R
L
INPUT
L
= 3k
= 3k
50
40
30
20
10
0
–55
Driver Output Waveforms
Receiver Short-Circuit Current
LT1130A/LT1140A Series
–25
0
+
TEMPERATURE (°C)
ISC
and V
+
25
ISC
–
50
–
pins may be paralleled into
75
CC
LT1137A • TPC11
100
. Larger value capaci-
LT1137A • TPC13
125
+
2V
CC
7
–