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LTC1327 3.3V Micropower EIA/TIA-562 Transceiver
FEATURES
s s s s s s s s
DESCRIPTIO
s
s
Low Supply Current 300A 0.2A Supply Current in SHUTDOWN ESD Protection 10kV Operates From a Single 3.3V Supply Uses Small Capacitors 0.1F Operates To 120k Baud Three-State Outputs are High Impedance When Off Output Overvoltage Does Not Force Current Back Into Supplies EIA/TIA-562 I/O Lines Can Be Forced to 25V Without Damage Flowthrough Architecture
The LTC1327 is an advanced low power, three-driver/fivereceiver EIA/TIA-562 transceiver. In the no load condition, the supply current is only 300A. The charge pump only requires four 0.1F capacitors. In SHUTDOWN mode, the supply current is further reduced to 0.2A. All EIA/TIA-562 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1327 is fully compliant with all data rate and overvoltage EIA/TIA-562 specifications. The transceiver can operate up to 120k Baud 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
V+ C1 0.1F C2 0.1F DR1 OUT RX1 IN DR2 OUT RX2 IN RX3 IN RX4 IN DR4 OUT RX5 IN ON/OFF VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1327
3-Drivers/5-Receivers with SHUTDOWN
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1327 TA01
Supply Current vs Temperature
600
C4 0.1F
V- C3 0.1F DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND
500
QUIESCENT CURRENT (A)
VCC = 3.3V ALL DRIVERS INPUTS TIED TO VCC
400 300 200 100 0
-20
U
1.2 1.0
SHUTDOWN CURRENT (A)
UO
UO
QUIESCENT CURRENT
0.8 0.6
SHUTDOWN CURRENT
0.4 0.2
0
20 40 60 TEMPERATURE (C)
80
LTC1327 * TA02
1
LTC1327
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW V+ C1+ C1- 1 3 4 28 V- 27 C2 + 26 C2 - 25 DR1 IN 24 RX1 OUT 23 DR2 IN 22 RX2 OUT 21 RX3 OUT 20 RX4 OUT 19 DR3 IN 18 RX5 OUT 17 GND 16 NC 15 NC N PACKAGE 28-LEAD PLASTIC DIP
Supply Voltage (VCC) ................................................. 5V Input Voltage Driver ...................................... - 0.3V to (VCC + 0.3V) Receiver ................................................ - 25V to 25V On/Off Pin ............................... -0.3V to (VCC + 0.3V) Output Voltage Driver .................................................... -25V to 25V Receiver ................................. -0.3V to (VCC + 0.3V) Short-Circuit Duration V + ................................................................................... 30 sec V - ................................................................................... 30 sec Driver Output ............................................. Indefinite Receiver Output ......................................... Indefinite Operating Temperature Range Commercial LTC1327C .......................... 0C to 70C Storage Temperature Range ................. - 65c to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER LTC1327CG LTC1327CN LTC1327CS
VCC 2
DR1 OUT 5 RX1 IN 6 DR2 OUT 7 RX2 IN 8 RX3 IN 9 RX4 IN 10 DR3 OUT 11 RX5 IN 12 ON/OFF 13 NC 14 G PACKAGE 28-LEAD SSOP
S PACKAGE 28-LEAD PLASTIC SOL
TJMAX = 125C, JA = 96C/ W (G) TJMAX = 125C, JA = 56C/ W (N) TJMAX = 125C, JA = 85C/ W (S)
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current VIN = 10V Input Low Threshold Input High Threshold Positive Negative (3k to GND) CONDITIONS
VCC = 3.3V, C1 to C4 = 0.1F, unless otherwise noted.
MIN
q q q q q q
TYP 4.5 - 4.5 1.4 1.4
MAX
UNITS V V
3.7 - 3.7 2
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = 3.3 VIN = 0 VOUT = 0V SHUTDOWN (Note 3), VOUT = 20V
0.8 5 -5
7 10
q q q
mA 500 A V V V k V V mA 10 A
0.8 0.1 3
1.3 1.7 0.4 5 0.2 3.2 - 10 1
2.4 1 7 0.4
Output Low, IOUT = - 1.6mA (VCC = 3.3V) Output High, IOUT = 160A (VCC = 3.3V) Sinking Current, VOUT = VCC SHUTDOWN (Note 3), 0 VOUT VCC
q q
3 -2
q
2
U
V V A A
W
U
U
WW
W
LTC1327
DC ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) On/Off Threshold Low On/Off Threshold High No Load (Note 2) SHUTDOWN (Note 3)
q q q q
VCC = 3.3V, C1 to C4 = 0.1F, unless otherwise noted.
MIN TYP 5.7 5.5 - 5.3 - 5.0 0.2 0.3 0.2 1.4 2 1.4 0.5 10 0.8 MAX UNITS V V V V ms mA A V V
CONDITIONS IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = - 5mA SHUTDOWN to Turn-On
AC CHARACTERISTICS
Slew Rate Driver Propagation Delay (TTL to EIA/TIA-562) Receiver Propagation Delay (EIA/TIA-562 to TTL) RL = 3k, CL = 51pF RL = 3k, CL = 1000pF tHLD tLHD tHLR tLHR
q q q q
3
6 5 2 2 0.3 0.2
30 3.5 3.5 0.8 0.8
V/s V/s s s s s
The q denotes specifications which apply over the operating temperature (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 output unloaded and driver inputs tied high. Note 3: Supply current measurement in SHUTDOWN mode is performed with VON/OFF = 0V.
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage vs Temperature
5 4
DRIVER OUTPUT VOLTAGE (V) 2.2
THRESHOLD VOLTAGE (V)
3 2 1 0 -1 -2 -3 -4 -5 0 10
VCC = 3.3V OUTPUT HIGH
SUPPLY CURRENT (mA)
ALL DRIVERS WITH LOAD RL = 3k
VCC = 3.3V OUTPUT LOW
40 30 20 50 TEMPERATURE (C)
UW
60
1327 G01
Receiver Input Thresholds vs Temperature
45 40
2.0
Supply Current vs Data Rate
VCC = 3.3V RL = 3k CL = 1000pF 3 DRIVERS ACTIVE
35 30 25 20 15 10 5 0
1.8 1.6 1.4 1.2 1.0
VTH+
VTH-
70
0
10
40 30 50 20 TEMPERATURE (C)
60
70
0
20
40 60 80 100 DATA RATE (k BAUD)
120
140
1327 G02
1327 G03
3
LTC1327
TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current vs Data Rate
45 40 SUPPLY CURRENT (mA) 35 30 25 20 15 10 5 0 0 20 40 60 80 100 DATA RATE (k BAUD) 120 140 VCC = 3.3V RL = 3k CL = 1000pF 3 DRIVERS ACTIVE 45 40
SHORT-CIRCUIT CURRENT (mA)
LEAKAGE CURRENT (A)
Receiver Short-Circuit Current vs Temperature
40 35 30 25 20 15
INPUT DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k
SHORT-CIRCUIT CURRENT (mA)
ISC -
10 5 0 0 10
ISC +
1327 G08 1327 G09
20
30
40
50
TEMPERATURE (C)
1327 G07
PI FU CTIO S
VCC: 3.3V Input Supply Pin. Supply current 0.2A in the SHUTDOWN mode. 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 SHUTDOWN mode which reduces the supply current to 0.2A and places all drivers and receivers in high impedance state. This pin cannot float. 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 3.3V. With multiple devices, the V + and V - pins may be paralleled into common capacitors. For large numbers 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 - 1.3). This pin requires an external capacitor C = 0.1F for a charge storage.
4
UW
1327 G03
Driver Leakage in SHUTDOWN vs Temperature
14 12 10 8 6 4 2 0
0 10 30 20 40 50 TEMPERATURE (C) 60 70
Driver Short-Circuit Current vs Supply Voltage
35 30 25 20 15 10 5 0 VOUT = 20V VOUT = -20V
ISC - ISC +
0
10
40 30 50 20 SUPPLY VOLTAGE (V)
60
70
1327 G05
1327 G06
Driver Output Waveform
RECEIVER OUTPUT CL = 50pF
Receiver Output Waveform
INPUT
60
70
U
U
U
LTC1327
PI FU CTIO S
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 20. DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in SHUTDOWN 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 SHUTDOWN mode to allow data line sharing.
TEST CIRCUITS
ESD Test Circuit
V+ C1 0.1F C2 0.1F DR1 OUT RX1 IN EIA/TIA 562 LINE PINS PROTECTED TO 10kV DR2 OUT RX2 IN RX3 IN RX4 IN DR3 OUT RX5 IN ON/OFF NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1327 28 27 26 25 24 23 22 21 20 19 18 17 16 15
LT1327 * TC01
U
U
U
Driver Timing Test Load
V- C3 0.1F DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND
RX IN RX 51pF RX OUTPUT
1327 TC02
C4 0.1F
DRIVER INPUT
DRIVER OUTPUT DR 51pF 3k
Receiver Timing Test Load
1327 TC03
5
LTC1327
SWITCHI G TI E WAVEFOR S
Driver Propagation Delay Timing
VCC DR INPUT 1.4V 1.4V 0V V+ 0V t LHD t HLD
1327 WF01
DR OUTPUT
Receiver Propagation Delay Timing
1.7V VCC 1.3V 0V VCC 0.8V t LHR t HLR 0V 0V
1327 WF02
RX INPUT
RX OUTPUT
APPLICATI
S I FOR ATIO
The LTC1327 is compatible with RS232 parts. This table shows some devices and the receiver input thresholds.
INPUT LOW THRESHOLD (VIL) MIN TYP MAX
0.8 0.8 0.8 0.8 0.65 0.65 0.8 0.65 0.8 0.6 0.8 0.75 0.75 0.75 0.75 0.5 1.3 1.3 1.3 1.3 1 1 1.2 1 1.3 1.2 1.2 - - 0.8 1 - - - - - 1.25 1.25 - 1.25 - - - 1.35 1.25 1.25 1.25 1.9
MANUFACTURER
Linear Technology
PART NUMBER
LT1080 LT1137A LT1330 LT1281 All Others
Texas Instruments
SN75189 SN75189A MAX232 SN75C185
Maxim Sipex Motorola National
MAX232A MAX241 SP232 SP301 MC1489 MC1489A DS1489 DS14C89A
6
U
W
W
U
W
UO
U
0V
V-
COMPATIBLE

INPUT HIGH THRESHOLD (VIH) MIN TYP MAX
- - - - 0.9 1.55 - 1.6 - - - 1.75 1 1.75 1 1.3 1.7 1.7 1.7 1.7 1.3 1.9 1.7 2.1 1.8 1.5 1.7 2.5 - 1.95 1.25 - 1.5 2.25 1.5 2.7 2.4 2.4 2.4 2.4 1.6 2.25 2.4 2.55 2.4 2.4 2.4
LTC1327
PACKAGE DESCRIPTIO
0.205 - 0.212* (5.20 - 5.38)
0 - 8 0.005 - 0.009 (0.13 - 0.22) 0.022 - 0.037 (0.55 - 0.95) 0.0256 (0.65) BSC 0.010 - 0.015 (0.25 - 0.38) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 0.045 (1.14) 0.002 - 0.008 (0.05 - 0.21)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.600 - 0.625 (15.240 - 15.875)
0.130 0.005 (3.302 0.127) 0.015 (0.381) MIN
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.625 -0.015
+0.635 15.87 -0.381
)
0.125 (3.175) MIN
0.035 - 0.080 (0.889 - 2.032) 0.100 0.010 (2.540 0.254)
0.005 (0.127) RAD MIN
0.291 - 0.299 (7.391 - 7.595) (NOTE 2)
0.093 - 0.104 0.010 - 0.029 x 45 (2.362 - 2.642) (0.254 - 0.737) 0 - 8 TYP 0.050 (1.270) TYP
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).
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.
U
Dimensions in inches (millimeters) unless otherwise noted. G Package 28-Lead SSOP
0.397 - 0.407* (10.07 - 10.33) 0.068 - 0.078 (1.73 - 1.99)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.301 - 0.311 (7.65 - 7.90)
0.045 (1.14)
N Package 28-Lead Plastic DIP
0.070 (1.778) TYP 28 27 26 25 24 23 1.455 (36.957) MAX 22 21 20 19 18 17 16 15
0.505 - 0.560 (12.827 - 14.224) 0.018 0.003 (0.457 0.076)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
S Package 28-Lead Plastic SOL
0.037 - 0.045 (0.940 - 1.143) 0.697 - 0.712 (17.70 - 18.08) (NOTE 2) 28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.014 - 0.019 (0.356 - 0.482)
0.004 - 0.012 (0.102 - 0.305)
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
1
2
3
4
5
6
7
8
9 10 11 12 13 14
7
LTC1327
U.S. Area Sales Offices
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 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331
International Sales Offices
FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" 58 Chemin de la Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 GERMANY Linear Techonolgy GMBH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology KK 5F YZ Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, 102 Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 KOREA Linear Technology Korea Branch Namsong Building, #505 Itaewon-Dong 260-199 Yongsan-Ku, Seoul Korea Phone: 82-2-792-1617 FAX: 82-2-792-1619 SINGAPORE Linear Technology Pte. Ltd. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 TAIWAN Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851
World Headquarters
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
LT/GP 1293 10K REV 0 * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1993

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