ADVANCED LINEAR DEVICES, INC. ALD1502/ALD2502 SINGLE/DUAL PRECISION HIGH SPEED MICROPOWER TIMER GENERAL DESCRIPTION APPLICATIONS The ALD1502/ALD2502 timers are high performance single/dual monolithic timing circuits built with advanced silicon gate CMOS technology. They offer the benefits of high input impedance, thereby allowing smaller timing capacitors and a longer timing cycle; high speed, with typical cycle time of 400ns; low power dissipation for battery operated environment; reduced supply current spikes, allowing smaller and lower cost decoupling capacitors. • High speed one-shot (monostable) Each timer is capable of producing accurate time delays and oscillations in both monostable and astable operation, and 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. pulse generation Precision timing Sequential timing Long delay timer Pulse width and pulse position modulation • Missing pulse detector • Frequency divider • Synchronized timer • • • • PIN CONFIGURATION There are three matched internal resistors (approximately 200KΩ 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. GND • • • • • • • High speed operation -- 2.5MHz typical oscillation at 5V High discharge sinking current of 80mA at 5V Guaranteed low operating supply voltage of 2V to 12V Functional equivalent to and same pin-out as NE555/NE556 with greatly expanded high and low frequency ranges High speed, low power, monolithic CMOS technology Low supply current 50µA typical for ALD1502 and100µA typical for ALD2502 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 8 TRIG 2 7 DISC OUT 3 6 THRES RST 4 5 CONT TOP VIEW DA, PA, SA PACKAGE FEATURES • • • • V+ 1 DSC1 1 14 V+ THRES1 2 13 DSC2 CONT1 3 12 THRES2 RST1 4 11 CONT2 OUT1 5 10 RST2 TRIG1 6 9 OUT2 GND 7 8 TRIG2 TOP VIEW DB, PB, SB PACKAGE BLOCK DIAGRAM (EACH TIMER) V+ (8) ORDERING INFORMATION -55°C to +125°C RESET (4) Operating Temperature Range * 0°C to +70°C 0°C to +70°C 8-Pin CERDIP Package ALD1502 DA 8-Pin Small Outline Package (SOIC) ALD1502 SA 8-Pin Plastic Dip Package ALD1502PA 14-Pin CERDIP Package ALD2502 DB 14-Pin Small Outline 14-Pin Plastic Dip Package (SOIC) Package ALD2502 SB ALD2502 PB THRESHOLD (6) CONTROL (5) R R OUTPUT (3) R S TRIGGER (2) DISCHARGE (7) R GND (1) * Contact factory for industrial temperature range © 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 13.2V -0.3V to V+ +0.3V 600 mW 0°C to + 70°C -55°C to +125°C -65°C to +150°C +260°C PA, PB, SA, SB package DA, DB package Storage temperature range Lead temperature, 10 seconds OPERATING ELECTRICAL CHARACTERISTICS TA = 25oC V+ = +5V unless otherwise specified Parameter Symbol Supply Voltage V+ Supply Current ALD1502 Supply Current ALD2502 IS IS Timing error / Astable mode Initial Accuracy terr Drift with Temperature 1 Drift with Supply Voltage 1 ∆t/∆T ∆t/∆V+ Threshold Voltage VTH 3.233 3.333 3.433 V Trigger Voltage VTRIG 1.567 1.667 1.767 V Trigger Current 2 ITRIG .01 0.4 nA Reset Voltage VRST 0.7 1.0 V Reset Current 2 IRST .01 0.4 nA Threshold Current 2 ITH .01 0.4 nA Control Voltage Level VCONT 3.333 3.433 V Output Voltage Drop (Low) VOL 0.2 0.4 V ISINK = 10mA Output Voltage Drop (High) VOH V ISOURCE = -2mA Rise Time of Output 1 tr 10 20 ns RL = 10MΩ Fall Time of Output 1 tf 10 20 ns CL = 10pF Discharge Transistor Leakage Current IDL .01 Discharge Voltage Drop VDISC 0.5 0.2 Maximum Frequency Astable Mode fMAX Minimum Trigger Pulse Width1 tTRIG Notes: 1 2 ALD1502/ALD2502 Min Typ Max 2 3.233 4.2 1.5 Test Conditions 12 V 50 100 90 180 µA µA Outputs Unloaded 1.0 2.2 % C = 0.1µF ppm/°C %/V RA = 1KΩ RB = 1KΩ 10.0 0.2 0.4 Unit 4.6 nA 1.0 0.4 2.5 50 100 V V I DISCHARGE = 80mA I DISCHARGE = 30mA MHz RA = 470Ω RB = 200Ω CT =100pF ns Sample tested parameters. Consists of junction leakage currents with strong temperature dependence. Advanced Linear Devices 2 TYPICAL PERFORMANCE CHARACTERISTICS MINIMUM PULSE WIDTH REQUIRED FOR TRIGGERING 100 50 800 V+ = 12V TA = 25°C MINIMUM PULSE WIDTH (ns) DISCHARGE SINK CURRENT (mA) DISCHARGE OUTPUT SINK CURRENT AS A FUNCTION OF DISCHARGE LOW VOLTAGE V+ = 5V 20 V+ = 2V 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01 700 TA = 25°C 600 500 V+ = 2V 400 V+= 5V 300 V+ =12V 200 100 0 0.02 0.05 0.1 0.2 0.5 1.0 ( RA- 2RB) 10 µF 1 µF 10 KΩ Ω 1M 0KΩ Ω M Ω 100 nF 10 nF 10 1K 10 10 0M Ω 1 nF FREQUENCY CHANGE (%) TA = 25°C 100 µF CAPACITANCE 40 +4 1 mF 100 pF +3 +2 +1 0 -1 -2 -3 -4 0 1.0 10 100 1K 10K 100K 1M 10M 100M 2 FREQUENCY (Hz) 4 6 8 10 12 SUPPLY VOLTAGE (V) SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE TIME DELAY IN THE MONOSTABLE MODE AS A FUNCTION OF RA AND C 10 mF SUPPLY CURRENT (µA) 100 TA = 25°C RA 10 µF 1 µF 100 nF 10 nF 1 nF 1K 10 Ω 10 KΩ 0K Ω 100 µF CAPACITANCE 30 FREQUENCY CHANGE IN THE ASTABLE MODE AS A FUNCTION OF SUPPLY VOLTAGE 10 mF 1 mF 20 LOWEST VOLTAGE LEVEL OF TRIGGER PULSE ( % VDD ) FREE RUNNING FREQUENCY AS A FUNCTION OF RA, RB AND C 0.1 10 0 DISCHARGE LOW VOLTAGE (V) Ω 1M MΩ Ω 10 0M 10 Ω 1G 90 80 70 TA = - 40°C 60 TA = + 20°C 50 TA = + 85°C 40 30 20 10 100 pF 0 100ns 1µs 10µs 100µs 1ms 10ms 100ms 1s 10s 100s ALD1502/ALD2502 TIME DELAY 0 2 4 6 8 10 12 SUPPLY VOLTAGE (V) Advanced Linear Devices 3 OUTPUT SINK CURRENT AS A FUNCTION OF OUTPUT VOLTAGE OUTPUT SINK CURRENT (mA) 100 50 TA = 25°C V+ = 5V V+ = 12V 20 10 5.0 V+ = 2V 2.0 1.0 0.5 0.2 OUTPUT SOURCE CURRENT (mA) TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT SOURCE CURRENT AS A FUNCTION OF OUTPUT VOLTAGE -0.1 V+ = 2V V+ = 5V V+ = 12V -0.2 -0.5 -1.0 -2.0 -5.0 -10 -20 -50 -100 0.1 0.01 0.02 0.05 0.1 0.2 0.5 -1.0 1.0 -0.5 -0.2 -0.1 -0.05 -0.02 -0.01 OUTPUT VOLTAGE (V) (REFERENCED TO V+) OUTPUT VOLTAGE (V) TYPICAL APPLICATIONS ( EACH TIMER ) ASTABLE MODE OPERATION (FREE RUNNING OSCILLATOR) ASTABLE MODE OPERATION 50% DUTY CYCLE V+ 1 V+ 8 1 8 2 7 RA 0.1µF 2 7 0.1µF RB R 3 6 4 5 V+ 3 6 4 5 V+ C Frequency f = 1/ (1.4 RC) C 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 8 R TRIGGER INPUT DELAYED PULSE OUTPUT 2 7 3 6 4 5 0.1µF C RESET ALD1502/ALD2502 Advanced Linear Devices 4