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| ADVANCED LINEAR DEVICES, INC. ALD555 HIGH SPEED CMOS TIMER GENERAL DESCRIPTION The ALD555 timer is a high performance 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; reduced supply current spikes, allowing smaller and lower cost decoupling capacitors. It 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 (pin 5). When the trigger input is below the trigger level, the output is in the high state and sourcing 2mA. When 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. FEATURES * Functional equivalent to NE555 with greatly expanded high and low frequency ranges * High speed, low power, monolithic CMOS technology * Low supply current 100A typical * Extremely low trigger, threshold and reset currents -- 1pA typical * High speed operation -- 2MHz oscillation * Low operating supply voltage 2 to 12V * Operates in both monostable and astable modes * Fixed 50% duty cycle or adjustable duty cycle CMOS, NMOS and TTL compatible input/output * High discharge sinking current (80mA) * Low supply current spikes ORDERING INFORMATION Operating Temperature Range * -55C to +125C 0C to +70C 0C to +70C 8-Pin CERDIP Package ALD555 DA 8-Pin Small Outline Package (SOIC) ALD555 SA 8-Pin Plastic Dip Package ALD555 PA 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 PIN CONFIGURATION GROUND TRIGGER OUTPUT RESET 1 2 3 4 8 7 6 5 V+ DISCHARGE THRESHOLD CONTROL TOP VIEW DA, PA, SA PACKAGE BLOCK DIAGRAM V+ (8) RESET (4) THRESHOLD (6) CONTROL (5) R R S DISCHARGE (7) R OUTPUT (3) TRIGGER (2) R GND (1) * 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 PA,SA package DA package OPERATING ELECTRICAL CHARACTERISTICS TA = 25 oC 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 Min 2 Typ Max 12 Unit V A Test Conditions 100 180 Outputs Unloaded terr t/T t/V+ VTH VTRIG ITRIG VRST IRST ITH VCONT VOL VOH tr tf IDL 3.273 0.4 3.273 1.607 1.0 10.0 0.1 3.333 1.667 .001 0.7 .001 .001 3.333 0.2 2.2 % ppm/C %/V C = 0.1F RA = 1K RB = 1K 3.393 1.737 0.2 1.0 0.2 0.2 3.393 0.4 4.2 V V nA V nA nA V V V ns ns nA ISINK = 10mA ISOURCE = -2mA RL = 10M CL = 10pF 15 10 .01 30 20 VDISC 0.5 0.2 1.0 0.4 V V I DISCHARGE = 80mA I DISCHARGE = 30mA RA = 470 RB = 200 CT = 200pF Maximum Frequency Astable Mode 1 2 fMAX 1.4 2 MHz Notes: Sample tested parameters. Consists of junction leakage currents with strong temperature dependence. ALD555 Advanced Linear Devices 9-2 TYPICAL PERFORMANCE CHARACTERISTICS DISCHARGE OUTPUT SINK CURRENT AS A FUNCTION OF DISCHARGE LOW VOLTAGE DISCHARGE SINK CURRENT (mA) 100 MINIMUM PULSE WIDTH REQUIRED FOR TRIGGERING 800 MINIMUM PULSE WIDTH (ns) 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 700 600 500 400 300 200 100 0 0 TA = 25C V+ = 2V V+ = 5V V+= 12V 0.02 0.05 0.1 0.2 0.5 1.0 DISCHARGE LOW VOLTAGE (V) 10 20 30 40 LOWEST VOLTAGE LEVEL OF TRIGGER PULSE ( % V+) FREE RUNNING FREQUENCY AS A FUNCTION OF RA, RB AND C 10 mF FREQUENCY CHANGE IN THE ASTABLE MODE AS A FUNCTION OF SUPPLY VOLTAGE +4 100 F ( RA - 2RB ) FREQUENCY CHANGE (%) 1 mF TA = 25C +3 +2 +1 0 -1 -2 -3 -4 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) 10 10 0M 1M 10 10 0K 1K K M 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 1 mF 100 F SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 200 180 TA = 25C RA SUPPLY CURRENT (uA) 160 140 120 100 80 60 40 20 0 CAPACITANCE 1K K 0K 10 F 1 F 100 nF 10 nF 1 nF 100 pF TA = - 40C TA = + 20C TA = + 85C 10 10 M 0M 1G 1M 10 10 100ns 1s 10s 100s 1ms 10ms 100ms 1s 10s 100s 0 2 4 6 8 10 12 TIME DELAY SUPPLY VOLTAGE (V) ALD555 Advanced Linear Devices 9-3 TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT SINK CURRENT AS A FUNCTION OF OUTPUT VOLTAGE 50 20 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01 0.02 0.05 0.1 0.2 0.5 1.0 OUTPUT VOLTAGE (V) V+ = 2V TA = 25C V+ = 12V 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) V+ = 5V OUTPUT VOLTAGE (V) (REFERENCED TO V+) TYPICAL APPLICATIONS ASTABLE MODE OPERATION 50% DUTY CYCLE V+ ASTABLE MODE OPERATION (FREE RUNNING OSCILLATOR) V+ 1 2 R 3 V+ 4 8 0.1F 7 6 C 5 1 2 3 V+ 4 8 RA 7 RB 6 C 5 0.1F Frequency f = 1/ (1.4 RC) Frequency f = 1.46 / (RA + 2RB)C Duty Cycle DC = RB / (RA + 2RB) MONOSTABLE MODE OPERATION (ONE SHOT PULSE) Pulse Delay td = 1.1 RC V+ 1 TRIGGER INPUT DELAYED PULSE OUTPUT RESET 2 3 4 8 R 7 6 C 5 0.1F ALD555 Advanced Linear Devices 9-4 |
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