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| 2436 COUNTDOWN POWER TIMER 2436 COUNTDOWN POWER TIMER Data Sheet 27462.20A COUNTER OSC. GROUND OUTPUT TOGGLE 1 2 3 4 F/F 8 7 6 MODE SELECT NO CONNECTION NO CONNECTION SUPPLY Dwg. No. PS-016 Dwg. No. PS-016 VREG 5 The ULQ2436M is a rugged, long-duration countdown timer specifically designed to operate in an automotive or industrial environment. It uses an internal RC oscillator to drive a digital countdown circuit for timing periods of typically 2-1/2 to 5 minutes. The ULQ2436M multiplies the oscillator period by 4064. Internal logic can automatically cause the timeout to be halved for successive timeouts. I2L technology is used for the countdown and logic circuitry and conventional linear bipolar devices for the oscillator and output power functions. This combination, together with the low-cost 8-pin mini-DIP plastic package, results in a very economical power timer suitable for a wide variety of applications. The Darlington-connected output driver is capable of switching loads up to 400 mA. Supply Current, IREG . . . . . . . . . . . . Output Current, IOUT . . . . . . . . . . . Output Voltage, VOUT . . . . . . . . . . . . . 28 V 400 mA Input Voltage, V1 or V4 (2 min.) . . . . . 24 V (continuous) . . . . . . . . . . . . . . . . . 16 V Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph D EN U RE NE I TF NE OR CR IS O DF -- FEATURES s s s s s s s ABSOLUTE MAXIMUM RATINGS at TA = +25C P O R D U T C N 28 V/400 mA Output Switch Low-Cost Ceramic Timing Capacitor Dual-Mode Timing Operation -40C to +85C Operation 10 V to 16 V Operation Internal Stabilizing Regulator Low-Cost 8-Pin Mini-DIP E C O Y L APPLICATIONS s s s s 15 mA Automotive Rear-Window Defogger Timer Automotive Courtesy Light Timer Appliance Power Timer Power Control System Operating Temperature Range, TA . . . . . . . . . . . . . . . . -40C to +85C Storage Temperature Range, TS . . . . . . . . . . . . . . . -65C to +150C Always order by complete part number: ULQ2436M . 2436 COUNTDOWN POWER TIMER ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 2.0 RJC = 55C/W TEST CIRCUIT AND TYPICAL REAR-WINDOW DEFOGGER APPLICATION V CC 1.5 R S 1 k 1.0 RT 1.5 M CT 0.1 F 65 , 65 mH COUNTER + CS 1 F 1 2 3 4 F/F VREG 8 7 6 5 0.5 FREE AIR, RJA = 80C/W TOGGLE 0 25 50 75 100 TEMPERATURE IN C 125 150 10 k 24 V 10 k Dwg. GP-009-1B Dwg. ES-012A ELECTRICAL SPECIFICATIONS at TA = -40C to +85C, VCC = 12 V (unless otherwise specified). Limits Characteristic Regulator Voltage Output Saturation Voltage Test Conditions IREG = 12 mA, Output Off IOUT = 400 mA, TA = +25C IOUT = 250 mA, TA = +25C Output Leakage Current VOUT = 28 V, VCC = 12 V VOUT = 22 V, VCC = Open Circuit Input Threshold Voltage Oscillator Tolerance 10 k Series Resistor TA = +25C TA = -40C to +85C Divider Count (VCC = 10 V to 16 V) Initial Timeout Subsequent Timeouts Min. 7.0 -- -- -- -- 1.0 -- -- 4064 2032 Max. 9.0 2.5 1.35 100 100 5.0 3.0 6.0 4064 2032 Units V V V A A V % % -- -- 115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1987, 1993, Allegro MicroSystems, Inc. 2436 COUNTDOWN POWER TIMER CIRCUIT DESCRIPTION OSC. An external resistor in the range of 200 k to 2 M and an external capacitor in the range of 0.001 F to 1 F determine the frequency of the internal oscillator. The period of oscillation is nominally RTCT with the overall output time period (after the digital countdown) of t = 4064 RTCT where t is in seconds. See also MODE SELECT. OUTPUT. The output is an open-collector of a Darlington-connected transistor. The output is ON (low) during the timing period. An external Zener diode is used to protect the output against inductive-load switching transients and automotive "load dump". TOGGLE. A push-button, momentary-action switch at this input toggles the timer from the OFF to the ON state. The oscillator and countdown circuitry are started on the rising edge of the input pulse. Internal de-bounce circuitry is included. SUPPLY. The timer requires a supply current applied to this pin through a current-limiting resistor (RS). An internal 8 volt Zener diode shunt regulator provides a stable supply to the device over wide supply voltage variations. Capacitor CS is used to provide decoupling. MODE SELECT. With MODE SELECT connected to GROUND, the first activation will run for the preset time delay. All activations after the first will time out at half of the initial preset time. This sequence is reset each time the supply is interrupted. With MODE SELECT connected to SUPPLY (VREG), the timer will repeat the preset time delay each time it is activated. TO COURTESY LIGHT COURTESY LIGHT TIMER BATTERY 1 k + RT 1 F CT 2 3 16 V 4 10 k F/F COUNTER 1 8 7 6 VREG 5 Dwg. No. ES-013 Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. Components made under military approvals will be in accordance with the approval requirements. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. |
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