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| ADVANCED LINEAR DEVICES, INC. ALD4501 QUAD PRECISION HIGH SPEED MICROPOWER TIMER GENERAL DESCRIPTION The ALD4501 timer is a high performance QUAD monolithic timing circuit built with advanced silicon gate CMOS technology. It offers the benefits of high input impedance, thereby allowing smaller timing capacitors and longer timing cycle; high speed with typical cycle time of 500ns; low power dissipation for battery operated environment; and reduced supply current spikes allowing smaller and lower cost decoupling capacitors. Each of the four timers can be independently operated in either the monostable, astable, or 50% duty cycle mode. Each timer is capable of producing accurate time delays and oscillations in both monostable and astable operation. It operates in the one-shot (monostable) mode or 50% duty cycle free running oscillation mode with a single resistor and one capacitor. The inputs and outputs are fully compatible with CMOS, NMOS or TTL logic. There are three matched internal resistors (approximately 200K each) that set the threshold and trigger levels at two-thirds and one-third respectively of V+. These levels can be adjusted by using the control terminal. When the trigger input is below the trigger level, the output is in the high state and sourcing 2mA. When the threshold input is above the threshold level at the same time the trigger input is above the trigger level, the internal flip-flop is reset, the output goes to the low state and sinks up to 10mA. The reset input overrides all other inputs and when it is active (reset voltage less than 1V), the output is in the low state. All four timers share the same control and reset pins so that timing functions are synchronized. FEATURES * * * * * * * * * * * High speed operation -- 2MHz typical oscillation at 5V Each discharge output sinking current: 40mA at 5V Guaranteed low operating supply voltage of 2 to 12V Each timer is functionally equivalent to NE555 with greatly expanded high and low frequency ranges High speed, low power, monolithic CMOS technology Low supply current 150A typical Extremely low trigger, threshold and reset currents -- 10pA typical Operates in both monostable and astable modes Fixed 50% duty cycle or adjustable duty cycle CMOS, NMOS and TTL compatible input/output Low supply current spikes APPLICATIONS. * High speed one-shot (monostable) pulse generation * Precision timing * Sequential timing * Long delay timer * Pulse width and pulse position modulation * Missing pulse detector * Frequency divider * Synchronized timer PIN CONFIGURATION RST DSC1 TRIG1 DSC2 TRIG2 DSC3 TRIG3 DSC4 TRIG4 V- 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 V+ OUT1 THRES1 OUT2 THRES2 OUT3 THRES3 OUT4 THRES4 CONT DE, PE, SE PACKAGE BLOCK DIAGRAM (EACH TIMER) V+ RESET ORDERING INFORMATION Operating Temperature Range * -55C to +125C 0C to +70C 0C to +70C 20-Pin CERDIP Package ALD4501 DE 20-Pin Small Outline Package (SOIC) ALD4501 SE 20-Pin Plastic Dip Package ALD4501 PE THRESHOLD CONTROL R R S DISCHARGE R OUTPUT TRIGGER R V- * Contact factory for industrial temperature range (c) 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Input voltage range Power dissipation Operating temperature range Storage temperature range Lead temperature, 10 seconds 13.2V -0.3V to V + +0.3V 600 mW 0C to + 70C -55C to +125C -65C to +150C +260C PE, SE package DE package OPERATING ELECTRICAL CHARACTERISTICS TA = 25oC V+ = +5V unless otherwise specified Parameter Supply Voltage Supply Current Timing error / Astable mode Initial Accuracy Drift with Temperature 1 Drift with Supply Voltage 1 Threshold Voltage Trigger Voltage Trigger Current 2 Reset Voltage Reset Current 2 Threshold Current 2 Control Voltage Level Output Voltage Drop (Low) Output Voltage Drop (High) Rise Time of Output 1 Fall Time of Output 1 Discharge Transistor Leakage Current Discharge Voltage Drop Symbol V+ IS terr t/T t/V+ VTH VTRIG ITRIG VRST IRST ITH VCONT VOL VOH tr tf IDL Min 2 Typ Max 12 Unit V A % Test Conditions 150 1.0 270 2.6 Outputs Unloaded C = 0.1F 10.0 0.1 3.233 1.567 3.333 1.667 .01 0.4 0.7 .01 .01 3.233 3.333 0.2 4.2 4.6 10 10 .01 20 20 3.433 1.767 0.4 1.0 0.4 0.4 3.433 0.4 ppm/C %/V V V nA V nA nA V V V ns ns nA RA = 1K RB = 1K ISINK = 10mA ISOURCE = -2mA RL = 10M CL = 10pF VDISC 0.5 0.2 1.0 0.4 V V I DISCHARGE = 40mA I DISCHARGE = 15mA RA = 470 RB = 200 CT =100pF Maximum Frequency Astable Mode fMAX 2 MHz Minimum Trigger Pulse Width1 tTRIG 50 100 ns Notes: 1 2 Sample tested parameters. Consists of junction leakage currents with strong temperature dependence. ALD4501 Advanced Linear Devices 9-2 TYPICAL PERFORMANCE CHARACTERISTICS DISCHARGE OUTPUT SINK CURRENT AS A FUNCTION OF DISCHARGE LOW VOLTAGE 100 DISCHARGE SINK CURRENT (mA) 800 MINIMUM PULSE WIDTH REQUIRED FOR TRIGGERING MINIMUM PULSE WIDTH (ns) 700 600 500 400 300 200 100 0 0 10 20 30 40 V+ = 2V V+ = 5V V+ = 12V TA = 25C 50 20 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01 TA = 25C V+ = 12V V+ = 2V V+ = 5V 0.02 0.05 0.1 0.2 0.5 1.0 DISCHARGE LOW VOLTAGE (V) LOWEST VOLTAGE LEVEL OF TRIGGER PULSE ( % V+) FREE RUNNING FREQUENCY AS A FUNCTION OF RA, RB AND C 10 mF FREQUENCY CHANGE (%) FREQUENCY CHANGE IN THE ASTABLE MODE AS A FUNCTION OF SUPPLY VOLTAGE +4 +3 +2 +1 0 -1 -2 -3 -4 1 mF 100 F ( RA - 2RB ) TA = 25C CAPACITANCE 10 F 1 F 100 nF 10 nF 1 nF 100 pF 0.1 1.0 10 100 1K 10K 100K 1M 10M 100M FREQUENCY (Hz) 1M 0K 10 M 0M 10 10 10 1K K 0 2 4 6 8 10 12 SUPPLY VOLTAGE (V) TIME DELAY IN THE MONOSTABLE MODE AS A FUNCTION OF RA AND C 10 mF SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 300 SUPPLY CURRENT (A) 1 mF 100 F TA = 25C RA 270 240 210 180 150 120 90 60 30 0 TA= - 40C TA= + 20C TA= + 85C CAPACITANCE 1 F 100 nF 10 nF 1 nF 100 pF 1K 10 10 K 0K 1M 10 F 10 100ns 1s 10s 100s 1ms 10ms 100ms 1s 10 M 0M 1G 10s 100s 0 2 4 6 8 10 12 TIME DELAY SUPPLY VOLTAGE (V) ALD4501 Advanced Linear Devices 9-3 TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT SINK CURRENT AS A FUNCTION OF OUTPUT VOLTAGE OUTPUT SOURCE CURRENT (mA) OUTPUT SOURCE CURRENT AS A FUNCTION OF OUTPUT VOLTAGE -0.1 -0.2 -0.5 -1.0 -2.0 -5.0 -10 -20 -50 -100 -1.0 -0.5 -0.2 -0.1 -0.05 -0.02 -0.01 V+ = 2V V+ = 5V V+ = 12V 100 OUTPUT SINK CURRENT (mA) 50 20 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01 TA = 25C V+ = 12V V+ = 5V V+ = 2V 0.02 0.05 0.1 0.2 0.5 1.0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) (REFERENCED TO V+) TYPICAL APPLICATIONS QUAD ASTABLE MODE OPERATION ( FREE RUNNING OSCILLATOR ) V+ 1 RA1 2 RB1 RA2 C1 RB2 RA3 RB3 RA4 RB4 9 C4 10 V11 12 C3 7 8 14 13 OUT4 C2 5 6 16 15 OUT3 3 4 18 17 OUT2 19 OUT1 20 V+ QUAD MONOSTABLE MODE OPERATION ( ONE SHOT PULSE ) V+ 1 R1 2 INPUT 1 3 R2 4 INPUT 2 5 R3 6 INPUT 3 7 R4 8 INPUT 4 9 10 V- 20 19 18 17 16 15 14 13 12 11 DELAY 4 C4 DELAY 1 C1 DELAY 2 C2 DELAY 3 C3 Frequency f = 1.46/ ( RA + 2RB ) C Duty Cycle DC = RB / ( RA + 2R B ) Pulse Delay td = 1.1RC SYNCHRONIZED TIMING GENERATORS V+ 1 2 TIMER 1 3 4 TIMER 2 5 6 TIMER 3 7 8 TIMER 4 C 9 10 20 19 18 C 17 16 15 14 C 13 R 12 11 OUT 2 R C OUT 3 R OUT 1 R Timer 4 oscillates in free running mode ( 50 % Duty Cycle ) and drives the trigger inputs of timers 1,2,3, each with independently set time delays. ALD4501 Advanced Linear Devices 9-4 |
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