DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver General Description Features The DS14C238 is a four driver, four receiver device which conforms to the TIA/EIA-232-E standard and CCITT V.28 recommendations. This device eliminates ± 12V supplies by employing an internal DC-DC converter to generate the necessary output levels from a single +5V supply. Driver slew rate control and receiver noise filtering have also been internalized to eliminate the need for external slew rate control and noise filtering capacitors. n n n n n n n n Connection Diagram Functional Diagram Conforms to TIA/EIA-232-E and CCITT V.28 Internal DC-DC converter Operates with single +5V supply Low power requirement — ICC 10 mA max Internal driver slew rate control Receiver noise filtering Operates above 120 kbits/sec Direct replacement for MAX238 DS011282-1 Order Number DS14C238WM See NS Package Number M24B DS011282-2 © 1999 National Semiconductor Corporation DS011282 www.national.com DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver May 1999 Absolute Maximum Ratings (Note 1) Lead Temp. (Soldering, 4 Seconds) Short Circuit Duration (DOUT) ESD Rating (HBM, 1.5 kΩ, 100 pF) 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 Driver Input Voltage Driver Output Voltage −0.3V to +6V (VCC −0.3V) to +15V +0.3V to −15V −0.3V to (VCC +0.3V) (V+ +0.3V) to (V− −0.3V) ± 30V Receiver Input Voltage Receiver Output Voltage −0.3V to (VCC +0.3V) Junction Temperature +150˚C Maximum Package Power Dissipation @ +25˚C (Note 6) WM Package 1400 mW Storage Temp. Range −65˚C to +150˚C +260˚C Continuous ≥ 2.0 kV Recommended Operating Conditions Supply Voltage, VCC Min Max Units 4.5 5.5 V +70 ˚C Operating Free Air Temp. (TA) DS14C238 0 Electrical Characteristics (Note 2) Over recommended operating conditions, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DEVICE CHARACTERISTICS V+ Positive Power Supply RL = 3 kΩ, C1–C4 = 1.0 µF, DIN = 0.8V 9.0 V V− Negative Power Supply RL = 3 kΩ, C1–C4 = 1.0 µF, DIN = 2.0V −8.0 V ICC Supply Current (VCC) No Load 7.0 10 mA V DRIVER CHARACTERISTICS VIH High Level Input Voltage 2.0 VCC VIL Low Level Input Voltage GND 0.8 V IIH High Level Input Current VIN ≥ 2.0V −10 +10 µA IIL Low Level Input Current VIN ≤ 0.8V −10 +10 µA VOH High Level Output Voltage RL = 3 kΩ 5.0 VOL Low Level Output Voltage −6.3 −5.0 V −30 −15 −5.0 mA VO = 0V, VIN = 2.0V 5.0 12 30 mA −2V ≤ VO ≤ +2V, VCC = GND = 0V 300 IOS+ Output High Short VO = 0V, VIN = 0.8V (Note 3) 7.4 V Circuit Current IOS− Output Low Short Circuit Current RO Output Resistance Ω RECEIVER CHARACTERISTICS VTH Input High Threshold Voltage VTL Input Low Threshold Voltage 0.8 1.5 VHY Hysteresis 0.2 0.4 1.0 V RIN Input Resistance 3.0 4.5 7.0 kΩ IIN Input Current VOH VOL High Level Output Voltage Low Level Output Voltage www.national.com 1.9 2.4 V V VIN = +15V 2.14 3.8 5.0 mA VIN = +3V 0.43 0.6 +1.0 mA VIN = −3V −1.0 −0.6 −0.43 mA VIN = −15V −5.0 −3.8 −2.14 mA VIN = −3V, IO = −3.2 mA 3.5 4.5 VIN = −3V, IO = −20 µA 4.0 4.9 VIN = +3V, IO = +2.0 mA 2 0.25 V V 0.4 V Switching Characteristics (Note 4) Over recommended operating conditions, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units µs DRIVER CHARACTERISTICS tPLH Propagation Delay LOW to HIGH RL = 3 kΩ 0.7 4.0 tPHL Propagation Delay HIGH to LOW CL = 50 pF 0.6 4.0 µs tsk Skew |tPLH–tPHL | (Figures 1, 2) 0.1 1.0 µs 30 SR1 Output Slew Rate RL = 3kΩ to 7 kΩ, CL = 50 pF 4.0 15 SR2 Output Slew Rate RL = 3 kΩ, CL = 2500 pF 3.0 5.0 V/µs V/µs RECEIVER CHARACTERISTICS tPLH Propagation Delay LOW to HIGH Input Pulse Width > 10 µs 2.0 6.5 tPHL Propagation Delay HIGH to LOW CL = 50 pF 2.8 6.5 µs tSK Skew | tPLH–tPHL | (Figures 3, 4) 0.8 2.0 µs tNW Noise Pulse Width Rejected (Figures 3, 4) 2.5 1.0 µs µs 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: 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 3: IOS+ and IOS− values are for one output at a time. If more than one output is shorted simultaneously, the device power dissipation may be exceeded. Note 4: Receiver AC input waveform for test purposes: tr = tf = 200 ns, VIH = 3V, VIL = −3V, f = 64 kHz (128 kbits/sec). Driver AC input waveform for test purposes: tr = tf ≤ 10 ns, VIH = 3V, VIL = 0V, f = 64 kHz (128 kbits/sec). Note 5: All typicals are given for VCC = 5.0V and TA = +25˚C. Note 6: Ratings apply to ambient temperature at +25˚C. Above this temperature derate: WM package 13.5 mW/˚C. Parameter Measurement Information DS011282-4 FIGURE 1. Driver Load Circuit DS011282-5 FIGURE 2. Driver Switching Waveform DS011282-6 FIGURE 3. Receiver Load Circuit 3 www.national.com Parameter Measurement Information (Continued) DS011282-7 FIGURE 4. Receiver Propagation Delays and Noise Rejection open, an internal pull-up resistor (500 kΩ minimum, typically 5 MΩ) pulls input to VCC. Output will be LOW for open inputs. Pin Descriptions VCC (pin 9) — Power supply pin for the device, +5V ( ± 10%). V+ (pin 11) — Positive supply for TIA/EIA-232-E drivers. Recommended external capacitor: C4 = 1.0 µF (6.3V). This supply is not intended to be loaded externally. V− (pin 15) — Negative supply for TIA/EIA-232-E drivers. Recommended external capacitor: C3 = 1.0 µF (16V). This supply is not intended to be loaded externally. C1+, C1− (pins 10 and 12) — External capacitor connection pins. Recommended capacitor – 1.0 µF (6.3V). C2+, C2− (pins 13 and 14) — External Capacitor connection pins. Recommended capacitor – 1.0 µF (16V). DIN 1–4 (pins 5, 18, 19, and 21) — Driver input pins are TTL/CMOS compatible. Inputs of unused drivers may be left www.national.com DOUT 1–4 (pins 2, 1, 24, and 20) — Driver output pins conform to TIA/EIA-232-E levels. RIN1 1–4 (pins 3, 7, 23, and 16) — Receiver input pins accept TIA/EIA-232-E input voltages ( ± 15V). Receivers feature a noise filter and guaranteed hysteresis of 200 mV. Unused receiver input pins may be left open. Internal input resistor (5 kΩ) pulls input LOW, providing a failsafe HIGH output. ROUT 1–4 (pins 4, 6, 22, and 17) — Receiver output pins are TTL/CMOS compatible. Receiver output HIGH voltage is specified for both CMOS and TTL load conditions. GND (pin 8) — Ground Pin. 4 DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS14C238WM NS Package Number M24B 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: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français 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. 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