LTC1347 Linear Technology, LTC1347 Datasheet

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LTC1347

Manufacturer Part Number
LTC1347
Description
5V Low Power RS232 3-Driver/5-Receiver Transceiver with 5 Receivers Active in Shutdown
Manufacturer
Linear Technology
Datasheet

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0.1 F
FEATURE
A
TYPICAL
C1
PPLICATI
Low Supply Current: 300 A
Five Receivers Kept Alive in Shutdown
ESD Protection Over 10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1 F
Operates to 120kBaud
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current Back
into Supplies
RS232 I/O Lines Can Be Forced to 25V
Without Damage
Pin Compatible with LT1137 and LT1237
Flowthrough Architecture
Notebook Computers
Palmtop Computers
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
0.1 F
C2
3-Drivers/5-Receivers with SHUTDOWN
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
RX5 IN
S
A
V
NC
V
O
CC
PPLICATI
+
10
11
12
13
14
U
1
2
3
4
5
6
7
8
9
S
LTC1347
O
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
V
GND
NC
NC
C3
0.1 F
1347 TA01
C4
0.1 F
3-Driver/5-Receiver Transceiver
D
The LTC1347 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300 A. The charge pump only
requires four 0.1 F capacitors.
In Shutdown mode, all five receivers are kept alive and the
supply current is 80 A. All RS232 outputs assume a high
impedance state in Shutdown and with the power off.
The LTC1347 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3k load. Both
driver outputs and receiver inputs can be forced to 25V
without damage, and can survive multiple 10kV ESD
strikes.
ESCRIPTIO
with 5 Receivers Active
1200
1000
Quiescent and Shutdown Supply Current vs
800
600
400
200
0
–40
TEST CONDITION:
V
CC
5V Low Power RS232
= 5V, ALL DRIVER INPUTS TIED TO V
–20
U
SHUTDOWN
QUIESCENT
CURRENT
0
CURRENT
TEMPERATURE (°C)
Temperature
20
40
in Shutdown
60
80
CC
LTC1347
.
100
1347 TA02
120
100
80
60
40
20
0
1

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LTC1347 Summary of contents

Page 1

... In Shutdown mode, all five receivers are kept alive and the supply current All RS232 outputs assume a high impedance state in Shutdown and with the power off. The LTC1347 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud with a 2500pF, 3k load. Both ...

Page 2

... ORDER PART + – – – LTC1347CG 4 25 DRIVER RX1 OUT LTC1347CN 6 DRIVER LTC1347CS 7 22 RX2 OUT 8 21 RX3 OUT 9 RX4 OUT DRIVER RX5 OUT 12 GND PACKAGE N PACKAGE ...

Page 3

... Note 2: Supply current is measured with driver and receiver outputs unloaded. Note 3: Supply current and leakage current measurements in Shutdown are performed with V Receiver Input Thresholds 2.2 2 1.4 1.2 1.0 – –20 0 TEMPERATURE (˚C) LTC1347 MIN TYP MAX 8.0 7.5 – 8.0 – 7.0 0.2 0.6 1.1 0.8 1.3 80.0 120.0 1.4 0.8 2.0 1.4 MIN TYP MAX 8 ...

Page 4

... LTC1347 W U TYPICAL PERFORMANCE CHARACTERISTICS V Supply Current DRIVERS LOADED DRIVER LOADED TEMPERATURE (°C) 1347 G04 Receiver Short-Circuit Current – 100 –40 – TEMPERATURE (°C) ...

Page 5

... RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev- els. All receivers are kept alive in shutdown LHD Figure 1. Driver Propagation Delay Timing 1.7V 0.8V t LHR Figure 2. Receiver Propagation Delay Timing LTC1347 = 0V. The driver outputs are protected against 1. – HLD ...

Page 6

... LTC1347 TEST CIRCUITS DRIVER DRIVER INPUT Figure 3. Driver Timing Test Load 0.1 F RS232 LINE PINS PROTECTED TO ±10kV 6 DRIVER OUTPUT 51pF 3k 1347 F03 + LTC1347 0 DRIVER 1 OUT 6 23 RX1 DRIVER 2 OUT 8 21 RX2 RX3 IN 10 ...

Page 7

... S Package 28-Lead Plastic SOL 0.037 – 0.045 (0.940 – 1.143) 0.050 0.014 – 0.019 0.004 – 0.012 (1.270) (0.356 – 0.482) (0.102 – 0.305) TYP LTC1347 0.397 – 0.407* (10.07 – 10.33 0.301 – 0.311 0.045 (7.65 – ...

Page 8

... LTC1347 NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...

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