LT1330 Datasheet, PDF (1/8 Pages) Linear Technology – 5V RS232 Transceiver with 3V Logic Interface and One Receiver Active in Shutdown

FEATURES
s _{3V Logic Interface}
s _{ESD Protection over ±10kV}
s _{Uses Small Capacitors: 0.1µF, 0.2µF, 1.0µF}
s _{One Low Power Receiver Remains Active While in}
Shutdown
s _{Pin Compatible with LT1137A and LT1237}
s _{120kBaud Operation for RL = 3k, CL = 2500pF}
s _{250kBaud Operation for RL = 3k, CL = 1000pF}
s _{CMOS Comparable Low Power: 30mW}
s _{Easy PC Layout—Flowthrough Architecture}
s _{Rugged Bipolar Design}
s _{Outputs Assume a High Impedance State When Off}
or Powered Down
s _{Absolutely No Latchup}
s _{60µA Supply Current in Shutdown}
s _{Available in SO and SSOP Packages}
APPLICATI S
s _{Notebook Computers}
s _{Palmtop Computers}
LT1330
5V RS232 Transceiver with
3V Logic Interface and One
Receiver Active in Shutdown
DESCRIPTIO
The LT^®1330 is a three driver, five receiver RS232 trans-
ceiver with low supply current. Designed to interface with
new 3V logic, the LT1330 operates with both a 5V power
supply and a 3V logic power supply. The chip may be shut
down to micropower operation with one receiver remain-
ing active to monitor RS232 inputs such as ring detect
from a modem.
The LT1330 is fully compliant with all EIA RS232 specifi-
cations. Additionally, the RS232 line input and output pins
are resilient to multiple ±10kV ESD strikes. This eliminates
the need for costly TransZorbs^® on line pins for the RS232
part.
The LT1330 operates to 120kbaud even driving high
capacitive loads. During shutdown, driver and receiver
outputs are at a high impedance state allowing devices to
be paralleled.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
TYPICAL APPLICATI
V⁺ 1
1.0µF
2 × 0.1µF
5V V_CC ²
3
4
DRIVER 1 OUT ⁵
RX1 IN ⁶
DRIVER 2 OUT ⁷
TO
LINE
RX2 IN ⁸
RX3 IN ⁹
RX4 IN ¹⁰
DRIVER 3 OUT ¹¹
RX5 IN (LOW-Q) ¹²
ON/OFF ¹³
3V V_L ¹⁴
LT1330
28 V^–
27
26
2 × 0.1µF
25 _{DRIVER 1 IN}
0.1µF
RECEIVER
OUTPUT
V_L = 3V
C_L = 50pF
24
RX1 OUT
23
DRIVER 2 IN
22
RX2 OUT
21 _{RX3 OUT}
TO LOGIC
DRIVER
OUTPUT
R_L = 3k
C_L = 2500pF
R
20
RX4 OUT
19
DRIVER 3 IN
18 RX5 OUT (LOW-Q)
RING DETECT IN
INPUT
17 GND
16 ^DRIVER
DISABLE
15
µCONTROLLER OR
µPROCESSOR
SHUTDOWN
CONTROL OUT
1330 TA01
Output Waveforms
1330 TA02
1