LTC1385 Linear Technology, LTC1385 Datasheet

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LTC1385

Manufacturer Part Number
LTC1385
Description
3.3V Low Power EIA/TIA-562 Transceiver
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Operates from a Single 3.3V Supply
Low Supply Current: I
I
I
ESD Protection Over 10kV
Uses Small Capacitors: 0.1 F
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA-562 I/O Lines Can Be Forced to 25V
Without Damage
Pin Compatible with LT1180A
Notebook Computers
Palmtop Computers
CC
CC
= 35 A in Driver Disable Mode
= 0.2 A in Shutdown Mode
LOGIC OUTPUT
LOGIC OUTPUT
LOGIC INPUT
LOGIC INPUT
0.1 F
0.1 F
ON/OFF
2-Drivers/2-Receivers with Shutdown
S
A
O
PPLICATI
18
12
11
13
10
2
4
5
6
U
and Driver Disable
V
V
CC
CC
S
DRIVER DISABLE
300k
300k
CC
LTC1385
= 200 A
1
5k
5k
O
U
14
9
16
8
15
17
3
7
562 OUTPUT
V CC = 3.3V
562 OUTPUT
562 INPUT
562 INPUT
0.1 F
LTC1385 • TA01
0.1 F
D
The LTC1385 is an ultra-low power, 2-driver/2-receiver
EIA / TIA-562 transceiver which operates from a single
3.3V supply. The charge pump requires only four space-
saving 0.1 F capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, I
only 200 A in the unloaded condition. In the Driver Disable
mode, the charge pump is turned off, the driver outputs
are forced into three-state, both receivers are kept active,
and I
is turned off and I
The LTC1385 is fully compliant with all data rate and
overvoltage EIA / TIA-562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF, 3k load.
Both driver outputs and receiver inputs can be forced to
ESD strikes.
25V without damage, and can survive multiple 10kV
ESCRIPTIO
CC
drops to 35 A. In the Shutdown mode, everything
EIA/TIA-562 Transceiver
Quiescent and Shutdown Supply Current
600
500
400
300
200
100
0
–20
TEST CONDITION: V
CC
U
0
drops to 0.2 A.
vs Temperature
TEMPERATURE (°C)
3.3V Low Power
20
CC
= 3.3V
QUIESCENT
CURRENT
40
SHUTDOWN
CURRENT
60
LTC1385
LTC1385 • TA02
80
1.2
1.0
0.8
0.6
0.4
0.2
0
CC
1
is

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LTC1385 Summary of contents

Page 1

... A. In the Shutdown mode, everything CC is turned off and I The LTC1385 is fully compliant with all data rate and overvoltage EIA / TIA-562 specifications. The transceiver can operate up to 120kbaud with a 1000pF, 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage, and can survive multiple 10kV ESD strikes ...

Page 2

... Low) OUT = (Note 3,4 20V ORDER PART TOP VIEW NUMBER 18 1 ON/OFF + LTC1385CN + 16 3 GND LTC1385CS – TR1 OUT + 14 5 RX1 IN – RX1 OUT – TR1 TR2 RX2 OUT S PACKAGE 18-LEAD PLASTIC SOL ...

Page 3

... (Figure 1) HLD t (Figure 1) LHD t (Figure 2) HLR t (Figure 2) LHR Note 3: Measurements made in the Driver Disable mode are performed with V DRIVER DISABLE Note 4: Measurements made in the Shutdown mode are performed with V = 0V. ON/OFF LTC1385 MIN TYP MAX 0.8 1.3 1.7 2.4 0.1 0.4 1 0.2 0.4 3.0 3.2 – 5 – ...

Page 4

... TEMPERATURE (°C) LTC1385 • TPC05 Driver Output Waveforms DRIVER OUTPUT 1000pF L DRIVER OUTPUT INPUT LTC1385 • TPC08 Supply Current vs Data Rate 3. 2500pF L ALL DRIVERS ACTIVE 100 DATA RATE (kBAUD) ...

Page 5

... Outputs are in a high impedance state when in the Shutdown mode 1.4V INPUT OUTPUT – LHR HLD 1385 F01 Figure 2. Receiver Propagation Delay Timing LTC1385 – Commutating Capacitor Inputs. These + – maintain = 0V. The driver CC 1.7V 1.3V 0.8V t HLR are ...

Page 6

... LTC1385 TEST CIRCUITS Driver Timing Test Load DRIVER OUTPUT DRIVER DRIVER INPUT 6 51pF 3k 1385 F03 ESD Test Circuit 17 2 LTC1385 0 0 300k 12 15 LOGIC INPUT 562 OUTPUT V CC 300k 11 8 LOGIC INPUT 14 13 LOGIC OUTPUT LOGIC OUTPUT ...

Page 7

... MIN 0.125 0.045 ± 0.015 (3.175) (1.143 ± 0.381) MIN 0.100 ± 0.010 (2.540 ± 0.254) LTC1385 0.278 – 0.289* (7.07 – 7.33 0.301 – 0.311 (7.65 – 7.90) 0.068 – 0.078 (1.73 – 1.99) 0.002 – ...

Page 8

... LTC1385 PACKAGE DESCRIPTION 0.291 – 0.299 (7.391 – 7.595) (NOTE 2) 0.005 0.010 – 0.029 (0.127) (0.254 – 0.737) RAD MIN 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.406 – 1.270) NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. ...

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