LM2240

LM2240 NSC | Alldatasheet

Document overview

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Technical content

Features

Y Accurate timing from microseconds to days Y Programmable delays from 1 RC to 255 RC Y TTL and CMOS compatible outputs Y Timing directly proportional to RC time constant Y High accuracy Y External sync and modulation capability Y Wide supply voltage range Y Excellent supply voltage rejection Connection Diagram 16-Lead Molded DIP TL/H/10837–1 Top View See NS Package Number N16E Order Number LM2240N C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Storage Temperature Range Molded DIP b65§Ct o a150§C Lead Temperature Molded DIP (Soldering, 10 Sec.) 265 §C Power Dissipation (Note 2) 1.8W Junction Temperature 150 Supply Voltage 18V Output Current 10 mA Output Voltage 18V Regulator Output Current 5.0 mA ESD Tolerance (Note 3) 2000V Operating Ratings Temperature Range 0 §Ct o7 0 §C Supply Range (Note 4) 4V to 15V LM2240

Electrical Characteristics

TA ea 25§C, V CC ea 5.0V, R e 10 k X,C e0.1 mF, unless otherwise specified. See Block Diagram. Symbol Characteristic Conditions Min Typ Max Units GENERAL CHARACTERISTIC ICC Supply Total Circuit V CC e 5.0V, V TR e 0V, V RS e 5.0V 4.0 7.0 Current VCC e 15V, V TR e 0V, V RS e 5.0V 13 18 mA Counter Only 1.5 VREG Regulator Output Measured at Pin 15 V CC e 5.0V 3.9 4.4 V VCC e 15V 5.8 6.3 6.8 TIME-BASE tACC Timing Accuracy V RS e 0, V TR e 5.0V 3.5 5.0 %(Note 5) Dt/DT Timing Shift 0 §C s TJ s 70§CV CC e 5.0V 200 ppm/§Cwith Temperature VCC e 15V 80 Dt/DV Timing Shift V CC t 8.0V 0.08 0.3 %/Vwith Supply fMAX Max Frequency R e 1.0 k X,C e 0.007 mF 130 kHz VMOD Modulation Voltage Level Measured at Pin 12 V CC e 5.0V 2.80 3.50 4.20 V VCC e 15V 10.5 RT Recommended Range 0.001 10 M Xof Timing Resistor CT Recommended Range 0.01 1000 mFof Timing Capacitor (Note 6) Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Note 2: Rating applies to ambient temperature at 25 §C. Above this temperature, derate at 15 mW/ §C. Note 3: Human body model, C e 100 pF, R S e 1500X. Note 4: For operation below 4.5 VDC, short pin 15 to pin 16. Note 5: Timing error solely introduced by LM2240 measured as % of ideal time-base period of T e RC. Note 6: Under the conditions of high supply voltages (V CC l 7.0V) and low values of timing capacitor (C T k 0.1 mF), a 600 pF capacitor may need to be connected from pin 14 to ground to ensure proper operation.

TA ea 25§C, V CC ea 5.0V, R e 10 k X,C e0.1 mF, unless otherwise specified. See Block Diagram. Symbol Characteristic Conditions Min Typ Max Units TRIGGER/RESET CONTROLS VTR Trigger Threshold Measured at Pin 11, 1.4 2.0 VVRS e 0V ITR Trigger Current V RS e 0V, V TR e 2.0V 10 mA ZT Trigger Impedance 25 k X tRSPT Trigger Response Time 1.0 ms(Note 7) VRS Reset Threshold Measured at Pin 10, V TR e 0V 1.4 2.0 V IR Reset Current V TR e 0V, V RS e 2.0V 10 mA ZR Reset Impedance 25 k X tRSPT Reset Response Time 0.8 ms(Note 7) COUNTER TRMAX Max Toggle Rate Measured at Pin 14 1.5 MHzVRS e 0V, V TR e 5.0V ZI Input Impedance 20 k X VTH Input Threshold 1.0 1.4 V tr Output Rise Time Measured at Pins 1 through 8 180 ns tf Output Fall Time RL e 3.0 k X,C L e 10 pF 180 IOb Sink Current V OL s 0.4V 2.0 4.0 mA ICEX Leakage Current V OH e 15V 0.01 15 mA Note 7: Propagation delay from application of trigger or reset input to corresponding state change in counter output at Pin 1. Block Diagram TL/H/10837–2

Typical Performance Characteristics in Reset Condition vs Supply Voltage Supply Current Values (Note 7) Timing Component Recommended Range of vs External RC Time-Base Period and Reset Amplitude Pulse Widths vs Trigger Minimum Trigger and Reset Voltage Drift vs Supply Time-Base Period Capacitor Timing vs Timing Minimum Trigger/Retrigger vs Modulation Voltage Time-Base Period Normalized Change in vs Temperature Time-Base Period vs Temperature Time-Base Period TL/H/10837–3

FIGURE 11. Astable Operation Examples of Output

LM2240 Programmable Timer/Counter Physical Dimensions inches (millimeters) 16-Lead Molded DIP LM2240 (N) 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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