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LTC1385 3.3V Low Power EIA/TIA-562 Transceiver
FEATURES
s s s s s s s s
DESCRIPTIO
s
s
Operates from a Single 3.3V Supply Low Supply Current: ICC = 200A ICC = 35A in Driver Disable Mode ICC = 0.2A in Shutdown Mode ESD Protection Over 10kV Uses Small Capacitors: 0.1F 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
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 spacesaving 0.1F capacitors. The transceiver operates in one of three modes: Normal, Driver Disable or Shutdown. In the Normal mode, ICC is only 200A 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 ICC drops to 35A. In the Shutdown mode, everything is turned off and ICC drops to 0.2A. 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.
APPLICATI
s s
S
Notebook Computers Palmtop Computers
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown and Driver Disable
2 0.1F 0.1F LOGIC INPUT 4 5 6 VCC 12 VCC LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 11 13 10 5k 5k ON/OFF 18 1 DRIVER DISABLE
LTC1385 * TA01
Quiescent and Shutdown Supply Current vs Temperature
600 1.2 1.0
SHUTDOWN CURRENT (A)
17 LTC1385 3 7 300k 15 300k 8 14 9
VCC = 3.3V
500
0.1F 562 OUTPUT 0.1F
QUIESCENT CURRENT (A)
400 300 200 100 0 -20 SHUTDOWN CURRENT 0 20 40 TEMPERATURE (C) 60 QUIESCENT CURRENT
562 OUTPUT 562 INPUT 562 INPUT
16
TEST CONDITION: VCC = 3.3V
LTC1385 * TA02
U
0.8 0.6 0.4 0.2 0 80
UO
UO
1
LTC1385 ABSOLUTE AXI U RATI GS
Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range .................... 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C Supply Voltage (VCC) ................................................ 5V Input Voltage Driver ....................................... - 0.3V to V CC + 0.3V Receiver ............................................... - 25V to 25V Digital Input ............................... - 0.3V to VCC + 0.3V Output Voltage Driver .................................................... - 25V to 25V Receiver .................................... - 0.3V to VCC + 0.3V
PACKAGE/ORDER I FOR ATIO
TOP VIEW DRIVER DISABLE C1 + V+ C1 - C2 + C2 - V- TR2 OUT RX2 IN 1 2 3 4 5 6 7 8 9 20 ON/OFF 19 VCC 18 GND 17 TR1 OUT 16 RX1 IN 15 RX1 OUT 14 TR1 IN 13 TR2 IN 12 RX2 OUT 11 NC G PACKAGE 20-LEAD SSOP
ORDER PART NUMBER LTC1385CG
NC 10
TJMAX = 125C, JA = 135C/W
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, Driver Disable = VCC, unless otherwise noted.
PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current CONDITIONS 3k to GND Positive Negative
q q q q q q q
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown or Driver Disable or VCC = 0V (Note 3,4), VOUT = 20V
2
U
U
W
WW
U
W
TOP VIEW DRIVER DISABLE 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2 - 6 V- 7 TR2 OUT 8 RX2 IN 9 18 ON/OFF 17 VCC 16 GND 15 TR1 OUT 14 RX1 IN 13 RX1 OUT 12 TR1 IN 11 TR2 IN 10 RX2 OUT
ORDER PART NUMBER LTC1385CN LTC1385CS
N PACKAGE S PACKAGE 18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
TJMAX = 125C, JA = 85C/W
MIN 3.7 - 3.7 2.0
TYP 4.5 - 4.5 1.4 1.4 - 20 10 10
MAX
UNITS V V V V A A mA A
0.8 5 - 40 500
LTC1385
DC ELECTRICAL CHARACTERISTICS
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, Driver Disable = VCC, unless otherwise noted.
PARAMETER Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) Digital Input Threshold Low Digital Input Threshold High CONDITIONS Input Low Threshold Input High Threshold - 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 3.3V) Output High, IOUT = 160A (VCC = 3.3V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V Shutdown (Note 4), 0V VOUT VCC IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = - 5mA Shutdown or Driver Disable to Turn-On No Load (Note 2) Shutdown (Note 4) Driver Disable (Note 3)
q q q q q q q q q q
MIN 0.8 0.1 3 3.0 -5 2
TYP 1.3 1.7 0.4 5 0.2 3.2 - 20 7 1 5.7 5.5 - 5.3 - 5.0 0.2 0.2 0.2 35 1.4 1.4
MAX
UNITS V V V k V V mA mA A V V V V ms
2.4 1.0 7 0.4
q
10
0.5 10 50 0.8
2.0
mA A A V V
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA / TIA-562) Receiver Propagation Delay (EIA / TIA-562 to TTL)
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 1000pF t HLD (Figure 1) t LHD (Figure 1) t HLR (Figure 2) t LHR (Figure 2) MIN 3
q q q q
TYP 8 5 2 2 0.3 0.2
MAX 30 3.5 3.5 0.8 0.8
UNITS V/s V/s s s s s
The q denotes specifications which apply over the operating temperature range 0C TA 70C. Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired. Note 2: Supply current is measured with driver and receiver outputs unloaded.
Note 3: Measurements made in the Driver Disable mode are performed with VDRIVER DISABLE = GND and VON/OFF = VCC. Note 4: Measurements made in the Shutdown mode are performed with VON/OFF = 0V.
3
LTC1385 TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage vs Temperature
5 4 OUTPUT HIGH VCC = 3.3V THRESHOLD VOLTAGE (V)
2.2 2.0 1.8 1.6 1.4 VTH- 1.2 1.0 0 0 10 40 30 50 20 TEMPERATURE (C) 60 70 0 20 40 80 100 60 DATA RATE (kBAUD) 120 140
DRIVER OUTPUT VOLTAGE (V)
3 2 1 0 -1 -2 -3 -4 -5 0 10
VTH+
ALL DRIVERS WITH LOAD RL = 3k
SUPPLY CURRENT (mA)
OUTPUT LOW VCC = 3.3V
40 30 20 50 TEMPERATURE (C)
VCC Supply Current vs Temperature
4.5 4.0
LEAKAGE CURRENT (A) SUPPLY CURRENT (mA)
45 40
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10
2 DRIVERS LOADED RL = 3k
35 30 25 20 15 10 5 0 VOUT = 20V VOUT = -20V
SHORT-CIRCUIT CURRENT (mA)
1 DRIVER LOADED RL = 3k
20 30 50 40 TEMPERATURE (C)
LTC1385 * TPC04
Receiver Short-Circuit Current vs Temperature
45 40
SHORT-CIRCUIT CURRENT (mA)
35 30 25 20 15 10 5 0 0 10 50 30 40 20 TEMPERATURE (C) 60 70 ISC+ ISC-
LTC1385 * TPC06
4
UW
60
LTC1385 * TPC01
Receiver Input Thresholds vs Temperature
20
Supply Current vs Data Rate
VCC = 3.3V RL = 3k CL = 2500pF ALL DRIVERS ACTIVE
15
10
5
70
LTC1385 * TPC02
LTC1385 * TPC03
Driver Leakage in Shutdown vs Temperature
18 16 14 12 10 8 6 4 2 60 70 0
Driver Short-Circuit Current vs Temperature
ISC-
ISC+
60
70
0
10
30 20 40 50 TEMPERATURE (C)
0
10
50 30 40 20 TEMPERATURE (C)
60
70
LTC1385 * TPC05
LTC1385 * TPC06
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k
Receiver Output Waveform
RECEIVER OUTPUT CL = 51pF
INPUT INPUT
LTC1385 * TPC08 LTC1385 * TPC09
LTC1385
PI FU CTIO S
VCC: 3.3V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic low puts the device in the Shutdown mode independent of the Driver Disable pin. The supply current drops to 0.2A and all driver and receiver outputs are forced into three-state. DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With the ON/OFF pin held high, a logic low forces the part into the Driver Disable mode with the charge pump turned off and the driver outputs forced into three-state. Both receivers remain active and the supply current drops to 35A. A logic high forces the part into the Normal mode. V +: Positive Supply Output (EIA/TIA-562 Drivers). V + 2VCC - 1V. This pin requires an external capacitor C = 0.1F for charge storage. The capacitor may be tied to ground or VCC. With multiple devices, the V + and V - pins may share a common capacitor. For a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V -: Negative Supply Output (EIA/TIA-562 Drivers). V - - (2VCC - 1.3V). This pin requires an external capacitor C = 0.1F for charge storage. C1+, C1-, C2+, C2 -: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1F: one from C1+ to C1-, and another from C2+ to C2-. To maintain charge pump efficiency, the capacitor's effective series resistance should be less than 2. TR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/ CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. To minimize power consumption, the internal driver pull-up resistors are disconnected from VCC in the Shutdown mode. TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in the Shutdown or Driver Disable mode or VCC = 0V. The driver outputs are protected against ESD to 10kV for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to 25V without damage. The receiver inputs are protected against ESD to 10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. Outputs are in a high impedance state when in the Shutdown mode.
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
1385 F01
Figure 1. Driver Propagation Delay Timing
W
W
U
U
U
U
RX INPUT RX OUTPUT t LHR
1.7V
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
1385 F02
0V V
-
Figure 2. Receiver Propagation Delay Timing
5
LTC1385 TEST CIRCUITS
Driver Timing Test Load Receiver Timing Test Load
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF 3k
RX OUTPUT RX INPUT RX 51pF
1385 F04
1385 F03
ESD Test Circuit
2 0.1F 0.1F LOGIC INPUT 4 5 6 VCC 12 VCC LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 11 13 10 5k 5k ON/OFF 18 1 DRIVER DISABLE
1385 F05
17 LTC1385 3 7 300k 15 300k 8 14 9
VCC
0.1F 562 OUTPUT
0.1F
562 OUTPUT 562 INPUT 562 INPUT
RS562 LINE PINS PROTECTED TO 10kV
16
6
LTC1385
PACKAGE DESCRIPTION U
Dimensions in inches (millimeters) unless otherwise noted. G Package 20-Lead SSOP
0.278 - 0.289* (7.07 - 7.33) 20 19 18 17 16 15 14 13 12 11
0.045 (1.14)
0.301 - 0.311 (7.65 - 7.90)
1 2 3 4 5 6 7 8 9 10 0.205 - 0.212* (5.20 - 5.38) 0.045 (1.14) 0.068 - 0.078 (1.73 - 1.99)
0 - 8
0.005 - 0.009 (0.13 - 0.22)
0.022 - 0.037 (0.55 - 0.95)
0.0256 (0.65) BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
0.010 - 0.015 (0.25 - 0.38)
0.002 - 0.008 (0.05 - 0.21)
20SSOP 0294
N Package 18-Lead Plastic DIP
0.905 (22.860) MAX 18 17 16 15 14 13 12 11 10
0.260 0.010 (6.604 0.254)
1 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127)
2
3
4
5
6
7
8
9
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.015 (0.381) MIN
0.065 (1.651) TYP
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
0.125 (3.175) MIN
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
N18 0392
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LTC1385
PACKAGE DESCRIPTION
0.005 (0.127) RAD MIN
0.291 - 0.299 (7.391 - 7.595) (NOTE 2) 0.010 - 0.029 x 45 (0.254 - 0.737)
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. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
Dimensions in inches (millimeters) unless otherwise noted. S Package 18-Lead Plastic SOL
0.447 - 0.463 (11.354 - 11.760) (NOTE 2) 18 17 16 15 14 13 12 11 10
SEE NOTE
0.394 - 0.419 (10.007 - 10.643)
1
2
3
4
5
6
7
8
9
0.093 - 0.104 (2.362 - 2.642)
0.037 - 0.045 (0.940 - 1.143)
0 - 8 TYP 0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
0.014 - 0.019 (0.356 - 0.482) TYP
SOL18 0392
LT/GP 0594 10K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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