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| DS14C335 +3.3V Supply TIA/EIA-232 3 x 5 Driver/Receiver May 1998 DS14C335 +3.3V Supply TIA/EIA-232 3 x 5 Driver/Receiver General Description The DS14C335 is three driver, five receiver device which conforms to TIA/EIA-232-E and CCITT V.28 standard specifications. This device employs an internal DC-DC converter to generate the necessary output levels from a +3.3V power supply. A SHUTDOWN (SD) mode reduces the supply current to 10 A maximum. In the SD mode, one receiver is active, allowing ring indicator (RI) to be monitored. PC Board space consumption is minimized by the availability of Shrink Small Outline Packaging (SSOP). This device's low power requirement and small footprint makes it an ideal choice for Laptop and Notebook applications. Features n Conforms to TIA/EIA-232-E and CCITT V.28 specifications n Operates with single +3.3V power supply n Low power requirement -- ICC 20 mA maximum n SHUTDOWN mode -- ICX 10 A maximum n One Receiver (R5) active during SHUTDOWN n Operates up to 128 kbps -- Lap-Link (R) Compatible n Flow through pinout n 4V/s minimum Slew Rate guaranteed n Inter-operates with +5V UARTs n Available in 28-lead SSOP EIAJ Type II package Connection Diagram DS14C335 Functional Diagram DS011734-1 Order Number DS14C335MSA See NS Package Number MSA28 DS011734-2 Lap-Link (R) is a registered trademark of Traveling Software. (c) 1999 National Semiconductor Corporation DS011734 www.national.com Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) V+ Pin V- Pin Input Voltage (DIN, SD) Driver Output Voltage Receiver Input Voltage Receiver Output Voltage Junction Temperature Storage Temperature Range Lead Temperature (Soldering 4 sec.) Short Circuit Duration (DOUT) -0.3V to + 6V (VCC-0.3V) to +14V +0.3V to -14V -0.3V to + 5.5V (V+ + 0.3V) to (V- -0.3V) Maximum Package Power Dissipation @ +25C SSOP MSA Package 1286 mW Derate MSA Package 10.3 mW/C above +25C ESD Rating (HBM, 1.5 k, 100 pF) 2.0 kV Recommended Operating Conditions Min 3.0 Supply Voltage (VCC) DC-DC Converter Capacitors 0.47 (C1-C5) Operating Free Air Temperature (TA) DS14C335 0 Max 3.6 Units V F 25V -0.3V to (VCC+ 0.3V) +150C -65C to +150C +260C continuous +70 C Electrical Characteristics (Notes 2, 3) Over recommended operating conditions, SD = 0.8V, unless otherwise specified. Symbol V+ V- ICC ICX VIH VIL IIH IIL Parameter Positive Power Supply Negative Power Supply Supply Current SHUTDOWN Supply Current High Level Enable Voltage Low Level Enable Voltage High Level Enable Current Low Level Enable Current High Level Input Voltage Low Level Input Voltage High Level Input Current Low Level Input Current High Level Output Voltage Low Level Output Voltage Output High Short Circuit Current IOS- RO VTH Output Low Short Circuit Current Output Resistance Input High Threshold Voltage -2V VO +2V, VCC = GND = 0V R1-R5, SD = 0.8V 300 1.4 2.4 V RECEIVER CHARACTERISTICS (Note 4) VO = 0V, VIN = 2.0V (Note 7) 6 12.3 40 mA VO = 0V, VIN = 0.8V (Note 7) -40 2.0V VIN 5.5V GND VIN 0.8V RL = 3 k -1.0 +5.0 +7.1 -6.3 -16.5 -5.0 -8 2.0V VIN 5.5V GND VIN 0.8V -2.0 No Load C1-C5 = 0.47 F Conditions DIN = 0.8V DIN = 2.0V Min Typ +9.3 -9.0 11.5 1.0 SD 2.0 GND 0.8 +2.0 20 10 Max Units V V mA A V V A A DEVICE CHARACTERISTICS No Load RL = 3 k, SD = VCC, 5.5V DRIVER CHARACTERISTICS VIH VIL IIH IIL VOH VOL IOS+ DIN 2.0 GND 0.8 +1.0 V V A A V V mA www.national.com 2 Electrical Characteristics (Notes 2, 3) Symbol Parameter (Continued) Over recommended operating conditions, SD = 0.8V, unless otherwise specified. Conditions R5, 2.0V SD 5.5V R1-R5, SD = 0.8V R5, 2.0V SD 5.5V VHY RIN IIN Hysteresis Input Resistance Input Current VIN = 3V to 15V VIN = +15V VIN = +3V VIN = -3V VIN = -15V VIN = -3V, IOH = -1 mA VIN = -3V, IOH = -100 A VIN = +3V, IOL = +2 mA Min Typ 2.0 0.4 0.1 50 3.0 2.14 0.43 -1.0 -5.0 2.4 2.8 3.1 3.28 0.23 0.4 1.1 0.5 300 3.8 7.0 5.0 1.0 -0.43 -2.14 Max 2.8 Units V V V mV k mA mA mA mA V V V RECEIVER CHARACTERISTICS (Note 4) VTL Input Low Threshold Voltage VOH High Level Output Voltage Low Level Output Voltage VOL Switching Characteristics (Note 2) Over recommended operating conditions, SD = 0.8V, unless otherwise specified. Symbol tPLH tPHL tSK SR1 SR2 tPLS tPSL tPHS tPSH tPLH tPHL tSK tPLS tPSL tPHS tPSH Parameter Propagation Delay LOW to HIGH Propagation Delay HIGH to LOW Skew |tPLH-tPHL| Output Slew Rate Output Slew Rate Propagation Delay LOW to SD Propagation Delay SD to LOW Propagation Delay HIGH to SD Propagation Delay SD to HIGH Propagation Delay LOW to HIGH Propagation Delay HIGH to LOW Skew |tPLH-tPHL| Propagation Delay LOW to SD Propagation Delay SD to LOW Propagation Delay HIGH to SD Propagation Delay SD to HIGH (Figures 7, 8) RL = 1 k CL = 50 pF R1-R4 Only CL = 50 pF (Figures 3, 3) 0.1 0.1 RL = 3 k to 7 k, CL = 50 pF (Figure 2) RL = 3 k, CL = 2500 pF (Figure 2) (Figures 5, 6) RL = 3 k CL = 50 pF 4 4 RL = 3 k CL = 50 pF (Figures 1, 2) Conditions Min 0.1 0.1 Typ 0.6 0.6 0 13 10 0.48 1.88 0.62 1.03 0.4 0.6 0.2 0.13 1.0 0.19 0.58 1.0 1.0 0.8 Max 1.0 1.0 0.2 30 30 Units s s s V/s V/s ms ms ms ms s s s s s s s DRIVER CHARACTERISTICS RECEIVER CHARACTERISTICS Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The tables of "Electrical Characteristics" specify conditions for device operation. Note 2: Typical values are given for VCC = 3.3V and TA = +25C. Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 4: Receiver characteristics are guaranteed for SD = 0.8V. When SD = 2.0V, receiver five (R5) is active and meets receiver parameters in SHUTDOWN (SD) mode, unless otherwise specified. Note 5: Generator characteristics for driver input: f = 64 kHz (128 kbits/sec), tr = tf < 10 ns, VIH = 3V, VIL = 0V, duty cycle = 50%. Note 6: Generator characteristics for receiver input: f = 64 kHz (128 kbits/sec), tr = tf = 200 ns, VIH = 3V, VIL = -3V, duty cycle = 50%. 3 www.national.com Switching Characteristics (Note 2) Note 7: Only one driver output shorted at a time. (Continued) Parameter Measurement Information DS011734-3 FIGURE 1. Driver Propagation Delay and Slew Rate Test Circuit DS011734-4 FIGURE 2. Driver Propagation Delay and Slew Rate Timing DS011734-5 FIGURE 3. Receiver Propagation Delay Test Circuit DS011734-6 FIGURE 4. Receiver Propagation Delay Timing DS011734-7 FIGURE 5. Driver SHUTDOWN (SD) Delay Test Circuit www.national.com 4 Parameter Measurement Information (Continued) DS011734-8 FIGURE 6. Driver SHUTDOWN (SD) Delay Timing DS011734-9 FIGURE 7. Receiver SHUTDOWN (SD) Delay Test Circuit DS011734-10 FIGURE 8. Receiver SHUTDOWN (SD) Delay Timing Pin Descriptions VCC (Pin 3). Power supply pin for the device, +3.3V (0.3V). V+ (Pin 1). Positive supply for TIA/EIA-232-E drivers. Recommended external capacitor -- 0.47 F (16V). This supply is not intended to be loaded externally. V- (Pin 25). Negative supply for TIA/EIA-232-E drivers. Recommended external capacitor -- 0.47 F (16V). This supply is not intended to be loaded externally. C1+, C1- (Pins 6, 24). External capacitor connection pins. Recommended capacitor -- 0.47 F (6.3V). C2+, C2- (Pins 2, 4). External capacitor connection pins. Recommended capacitor -- 0.47 F (16V). C3+, C3- (Pins 28, 26). External capacitor connection pins. Recommended capacitor -- 0.47 F (6.3V). SHUTDOWN (SD) (Pin 23). A High on the SHUTDOWN pin will lower the total ICC current to less than 10 A, providing a low power state. In this mode receiver R5 remains active. The SD pin should be driven or tied low (GND) to disable the shutdown mode. DIN 1-3 (Pins 7, 8, 9). Driver input pins are JEDEC 3.3V standard compatible. DOUT 1-3 (Pins 22, 21, 20). Driver output pins conform to TIA/ElA-232 -E levels. RIN 1-5 (Pins 19, 18, 17, 16, 15). Receiver input pins accept TIA/EIA-232-E input voltages (25V). Receivers guarantees hysteresis of TBD mV. Unused receiver input pins may be left open. Internal input resistor (5 k) pulls input LOW, providing a failsafe HIGH output. ROUT 1-5 (Pins 10, 11, 12, 13, 14). Receiver output pins are JEDEC 3.3V standard compatible. GND (Pin 27). Ground Pin. 5 www.national.com Application Information 9-Pin SERIAL PORT APPLICATION In a typical Data Terminal Equipment (DTE) to Data Circuit-Terminating Equipment (DCE) 9-pin de-facto interface implementation, 2 data lines and 6 control lines are required. The data lines are TXD and RXD and the control lines are RTS, DTR, DSR, DCD, CTS and RI. The DS14C335 is a 3 x 5 Driver/Receiver and offers a single chip solution for the DTE interface as shown in Figure 9. Ring Indicator (RI) is used to inform the DTE that an incoming call is coming from a remote DCE. When the DS14C335 is in SHUTDOWN (SD) mode, receiver five (R5) remains active and monitors RI circuit. This active receiver (R5) alerts the DTE to switch the DS14C335 from SHUTDOWN to active mode. DS011734-11 FIGURE 9. Typical DTE Application MOUSE DRIVING The DS14C335 was tested for drive current under the following mouse driving conditions: * Two driver outputs set at VOH and their outputs were tied together (paralleled), sourcing current to supply the V+ terminal of the mouse electronics EXTERNAL DC-DC CONVERTOR COMPONENTS The DS14C335 with it's unique DC-DC Convertor triples the power supply voltage (3.0V) to +9.3V and then inverts it to a -9V potential. This unique convertor ONLY requires 5 external surface mount 0.47 F capacitors. The five identical components were chosen to simplify PCB layout and the procurement of components. The DS14C335's DC-DC Convertor also provides a larger signal swing (higher at RS-232 standard data rates) which translates to more noise margin for the rejection of ground potential differences, induced noise, and crosstalk compared to other DC-DC convertor schemes which only provide limited signal swing and limited noise margin. DC-DC CONVERTOR CAPACITORS The use of polarized capacitors is not required. However, if they are used, the polarity indicated in the DS14C335 Functional Diagram must be honored for proper operation. Surface mount capacitors or ceramic capacitors may be used, however, for optimal efficiency, capacitors with a low effective series resistance (ESR) should be used. Values in the low Ohms() is normally acceptable. INTEROPERATION WITH +5V UARTs The DS14C335 provides full RS-232 driver output levels and a single chip solution for the popular 9-pin defacto serial port. This device may be used in either pure +3V applications or 6 * One driver output set at VOL to sink the current from the V- terminal of the mouse electronics * One receiver was used to accept data from the mouse * Power Supply Voltage (VCC): 3.0V to 3.6V Completion of the testing (performed by National's Data Transmission Applications Group and a major PC manufacturer) concluded that the DS14C335 and it's DC-DC Convertor supplied adequate drive capability to power a typical PC mouse. The mouse tested was specified with the following conditions: 10 mA at +6V 5.0 mA at -6V Since driver current is limited, it is recommended that newer lower power mice be specified for battery powered applications. Using older high power mice is wasteful of precious battery charge. www.national.com Application Information (Continued) POWER DISSIPATION IN REAL RS-232 APPLICATIONS The DS14C335 DC-DC Convertor uses special circuitry that helps limit the increase in power supply current as frequency increases. A complete description of power dissipation and calculations for RS-232 applications can be found in National Application Note AN-914 titled "Understanding Power Requirements in RS-232 Applications". Typical performance curves are also located in this datasheet for quick reference. mixed power supplied +3V/+5V applications. The Driver Input (DIN) and ShutDown (SD) input pins can directly accept full +5V levels without the need for any external components. The Receiver Output (ROUT) is specified at 2.4V minimum while sourcing 1 mA. This level is compatible with standard TTL thresholds. For a complete discussion on "Interoperation of the DS14C335 with +5V UARTs" please see National Application Note AN-876. Typical Performance Characteristics Supply Current vs Frequency vs Driver Loads Supply Current vs Frequency vs Driver Loads DS011734-12 DS011734-13 Supply Power vs Data Rate Supply Current vs Frequency (Receiver) DS011734-14 DS011734-15 7 www.national.com Typical Performance Characteristics Driver Output vs Data Rate (Continued) DS011734-16 www.national.com 8 DS14C335 +3.3V Supply TIA/EIA-232 3 x 5 Driver/Receiver Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS14C335MSA NS Package Number MSA28 LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. |
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