DESCRIPTIO TYPICAL APPLICATIO. LTC1383 5V Low Power RS232 Transceiver FEATURES APPLICATIO S

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1 LTC V Low Power RS Transceiver FEATRES Operates from a Single V Supply Low Supply Current: I CC = µa ESD Protection Over ±kv Available in -Pin SOIC Narrow Package ses Small Capacitors: Operates to kbaud Output Overvoltage Does Not Force Current Back into Supplies RS I/O Lines Can Be Forced to ±V Without Damage Pin Compatible with LTA and MAXA APPLICATIO S Notebook Computers Palmtop Computers DESCRIPTIO The LTC is an ultra-low power -driver/-receiver RS transceiver that operates from a single V supply. The charge pump requires only four spacesaving capacitors. The supply current (I CC ) of the transceiver is only µa with driver outputs unloaded. The LTC is fully compliant with all data rate and overvoltage RS specifications. The transceiver can operate up to kbaud with a pf, kω load. Both driver outputs and receiver inputs can be forced to ±V without damage and can survive multiple ±kv ESD strikes., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Quiescent Supply Current vs Temperature LTC = V OTPT OTPT INPT INPT QIESCENT CRRENT (µa) TEST CONDITION: = V QIESCENT CRRENT TEMPERATRE ( C) LTC TA LTC TA fa

2 LTC ABSOLTE AXI RATI GS W W W Supply Voltage ( )... V Input Voltage Driver....V to +.V Receiver... V to V Digital Input....V to +.V Output Voltage Driver... V to V Receiver....V to +.V Short-Circuit Duration V +... sec V... sec Driver Output... Indefinite Receiver Output... Indefinite Operating Temperature Range LTCC... C to C LTCI... C to C Storage Temperature Range... C to C Lead Temperature (Soldering, sec)... C W PACKAGE/ORDER I FOR ATIO C + V + C C + C V TR OT RX IN N PACKAGE -LEAD PDIP TOP VIEW GND TR OT RX IN RX OT TR IN TR IN RX OT S PACKAGE -LEAD PLASTIC SO T JMAX = C, θ JA = C/W (N) T JMAX = C, θ JA = C/W (S) Consult LTC Marketing for parts specified with wider operating temperature ranges. ORDER PART NMBER LTCCN LTCCS LTCIN LTCIS DC ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. = V, C = C = C = C =, unless noted. PARAMETER CONDITIONS MIN TYP MAX NITS Any Driver Output Voltage Swing k to GND Positive.. V Negative.. V Logic Input Voltage Level Input Low Level (V OT = High).. V Input High Level (V OT = Low).. V Logic Input Current V IN = µa V IN = V µa Output Short-Circuit Current V OT = V ± ± ma Any Receiver Input Voltage Thresholds Input Low Threshold.. V Input High Threshold.. V Hysteresis.. V Input Resistance V V IN V kω Output Voltage Output Low, I OT =.ma ( = V).. V Output High, I OT = µa ( = V).. V Output Short-Circuit Current Sinking Current, V OT = ma Sourcing Current V OT = V ma Power Supply Generator V + Output Voltage I OT = ma. V I OT = ma. V V Output Voltage I OT = ma. V I OT = ma. V fa

3 DC ELECTRICAL CHARACTERISTICS AC CHARACTERISTICS LTC The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. = V, C = C = C = C =, unless noted. PARAMETER CONDITIONS MIN TYP MAX NITS Power Supply Supply Current No Load (Note ), C to C.. ma No Load (Note ), C to C.. ma Digital Input Threshold Low.. V Digital Input Threshold High.. V The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. = V, C = C = C = C =, unless noted. PARAMETER CONDITIONS MIN TYP MAX NITS Slew Rate R L = k, C L = pf V/µs R L = k, C L = pf V/µs Driver Propagation Delay t HLD (Figure ). µs (TTL to RS) t LHD (Figure ). µs Receiver Propagation Delay t HLR (Figure ).. µs (RS to TTL) t LHR (Figure ).. µs Note : Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note : Supply current is measured with driver and receiver outputs unloaded. TYPICAL PERFOR A CE CHARACTERISTICS W OTPT VOLTAGE (V) Driver Output Voltage vs Temperature R L = k OTPT HIGH = V =.V OTPT LOW =.V = V TEMPERATRE ( C) THRESHOLD VOLTAGE (V) Receiver Input Thresholds vs Temperature V TH V TL TEMPERATRE ( C) SPPLY CRRENT (ma) Supply Current vs Data Rate = V R L = k C L = pf S ACTIVE DATA RATE (kbad) LTC TPC LTC TPC LTC TPC fa

LTC TYPICAL PERFOR A CE CHARACTERISTICS W SPPLY CRRENT (ma) Supply Current vs Temperature S LOADED R L = k LOADED R L = k OTPT R L = k C L = pf OTPT R L = k INPT Driver Output Waveforms µs/div LTC

GND: Ground Pin. V + : Positive Supply Output (RS Drivers). V + V. This pin requires an external capacitor C = for charge storage. The capacitor may be tied to ground or.

4 LTC TYPICAL PERFOR A CE CHARACTERISTICS W SPPLY CRRENT (ma) Supply Current vs Temperature S LOADED R L = k LOADED R L = k OTPT R L = k C L = pf OTPT R L = k INPT Driver Output Waveforms µs/div LTC TPC RECEIVER OTPT C L = pf INPT Receiver Output Waveforms µs/div LTC TPC TEMPERATRE ( C) LTC TPC PI F CTIO S : V Input Supply Pin. This pin should be decoupled with a ceramic capacitor. GND: Ground Pin. V + : Positive Supply Output (RS Drivers). V + V. This pin requires an external capacitor C = for charge storage. The capacitor may be tied to ground or. With multiple devices, the V + and V pins may share a common capacitor. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V : Negative Supply Output (RS Drivers). V ( V). This pin requires an external capacitor C = for charge storage. C +, C, C +, C : Commutating Capacitor Inputs. These pins require two external capacitors C = : one from C + to C and another from C + to C. To maintain charge pump efficiency, the capacitor s effective series resistance should be less than Ω. TR IN: RS Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since input pull-up resistors to are included on chip. TR OT: Driver Outputs at RS Voltage Levels. The driver outputs are protected against ESD to ±kv for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to ±V without damage. The receiver inputs are protected against ESD to ±kv for human body model discharges. Each receiver provides.v of hysteresis for noise immunity. RX OT: Receiver Outputs with TTL/CMOS Voltage Levels. fa

5 LTC W W SWITCHI G TI E WAVEFOR S INPT.V.V V RX INPT.V.V V OTPT t LHD V t HLD V V + V RX OTPT t LHR.V t HLR.V V LTC F LTC F Figure. Driver Propagation Delay Timing Figure. Receiver Propagation Delay Timing TEST CIRCITS Driver Timing Test Load Receiver Timing Test Load INPT OTPT pf k RX INPT RX RX OTPT pf LTC TA LTC TA ESD Test Circuit LTC OTPT OTPT RS LINE PINS PROTECTED INPT TO ±kv INPT LTC TA fa

6 LTC TYPICAL APPLICATIO S Paralleling Power Supply Generator with Common Storage Capacitors = V = V LTC LTC OTPT OTPT OTPT OTPT INPT INPT INPT INPT LTC TA fa

7 LTC PACKAGE DESCRIPTIO N Package -Lead PDIP (Narrow. Inch) (Reference LTC DWG # --).* (.) MAX. ±.* (. ±.).. (..). ±. (. ±.).. (..).. (..) ( ) NOTE: INCHES. DIMENSIONS ARE MILLIMETERS. (.) MIN. (.) MIN *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.mm). (.) BSC. (.) TYP. ±. (. ±.) N 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. fa

8 LTC PACKAGE DESCRIPTIO S Package -Lead Plastic Small Outline (Narrow. Inch) (Reference LTC DWG # --) N. BSC. ±... (..) NOTE. MIN N/. ±... (..) N N/.. (..) NOTE. ±. TYP.. (..) RECOMMENDED SOLDER PAD LAYOT.. (..) TYP.. (..).. (..).. (..) NOTE: INCHES. DIMENSIONS IN (MILLIMETERS).. (..) TYP. DRAWING NOT TO SCALE. THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED." (.mm). (.) BSC S RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT/LT V, Driver, Receiver RS Transeivers ±V ESD per IEC - LTC V, Driver, Receiver RS Transceiver µa Supply Current,.µA in Shutdown LTC V, Driver, Receiver RS Transceiver µa Supply Current, Receivers Active in Shutdown LTC.V, Driver, Receiver RS Transceiver µa Supply Current, Receivers Active in Shutdown LTC.V, Driver, Receiver RS Transceiver µa Supply Current, Narrow -pin SO Linear Technology Corporation McCarthy Blvd., Milpitas, CA - () - FAX: () - linear.com fa LW/TP K REV A PRINTED IN SA LINEAR TECHNOLOGY CORPORATION

FEATURES TYPICAL APPLICATIO. LTC1382 5V Low Power RS232 Transceiver with Shutdown DESCRIPTIO APPLICATIO S

FEATURES TYPICAL APPLICATIO. LTC1382 5V Low Power RS232 Transceiver with Shutdown DESCRIPTIO APPLICATIO S FEATRES Operates from a Single V Supply Low Supply Current: I CC = µa I CC =.µa in Shutdown Mode ESD Protection Over ±1kV ses Small Capacitors:.1µF Operates to 1kBaud Output Overvoltage Does Not Force