2436 2436 Data Sheet 27462.20A COUNTDOWN POWER TIMER OSC. 1 GROUND 2 OUTPUT 3 TOGGLE 4 COUNTER COUNTDOWN POWER TIMER F/F VREG 8 MODE SELECT 7 NO CONNECTION 6 NO CONNECTION 5 SUPPLY Dwg. No. PS-016 Dwg. No. PS-016 T C 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. U D O R P O E C D E N U RE N I T FE N E O R C R S I O D F — ■ ■ ■ ■ ■ ■ ■ Supply Current, IREG . . . . . . . . . . . . 15 mA Output Voltage, VOUT . . . . . . . . . . . . . 28 V Output Current, IOUT . . . . . . . . . . . N The Darlington-connected output driver is capable of switching loads up to 400 mA. FEATURES ABSOLUTE MAXIMUM RATINGS at TA = +25°C Y L 28 V/400 mA Output Switch Low-Cost Ceramic Timing Capacitor Dual-Mode Timing Operation -40°C to +85°C Operation 10 V to 16 V Operation Internal Stabilizing Regulator Low-Cost 8-Pin Mini-DIP APPLICATIONS ■ ■ ■ ■ Automotive Rear-Window Defogger Timer Automotive Courtesy Light Timer Appliance Power Timer Power Control System 400 mA Input Voltage, V1 or V4 (2 min.) . . . . . 24 V (continuous) . . . . . . . . . . . . . . . . . 16 V Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . . . -40°C to +85°C Storage Temperature Range, TS . . . . . . . . . . . . . . . -65°C to +150°C Always order by complete part number: ULQ2436M . 2436 2.0 TEST CIRCUIT AND TYPICAL REAR-WINDOW DEFOGGER APPLICATION RθJC = 55°C/W V CC 1.5 50 75 100 TEMPERATURE IN °C CS 1 µF 1 CT 0.1 µF FREE AIR, RθJA = 80°C/W 65 Ω, 65 mH TOGGLE 0 25 + RT 1.5 MΩ 1.0 0.5 R S 1 kΩ 125 COUNTER ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS COUNTDOWN POWER TIMER 2 10 kΩ 24 V 3 4 150 8 7 6 F/F VREG 5 10 kΩ Dwg. GP-009-1B Dwg. ES-012A ELECTRICAL SPECIFICATIONS at TA = -40°C to +85°C, VCC = 12 V (unless otherwise specified). Limits Characteristic Test Conditions Min. Max. Units Regulator Voltage IREG = 12 mA, Output Off 7.0 9.0 V Output Saturation Voltage IOUT = 400 mA, TA = +25°C — 2.5 V IOUT = 250 mA, TA = +25°C — 1.35 V VOUT = 28 V, VCC = 12 V — 100 µA VOUT = 22 V, VCC = Open Circuit — 100 µA Input Threshold Voltage 10 kΩ Series Resistor 1.0 5.0 V Oscillator Tolerance TA = +25°C — ±3.0 % TA = -40°C to +85°C — ±6.0 % Initial Timeout 4064 4064 — Subsequent Timeouts 2032 2032 — Output Leakage Current Divider Count (VCC = 10 V to 16 V) 115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1987, 1993, Allegro MicroSystems, Inc. 2436 COUNTDOWN POWER TIMER CIRCUIT DESCRIPTION COURTESY LIGHT TIMER OSC. An external resistor in the range of 200 kΩ to 2 MΩ and an external capacitor in the range of 0.001 µF to 1 µF 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 BATTERY 1 kΩ + 1 µF R T COUNTER 1 C T t = 4064 RTCT TO COURTESY LIGHT 2 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”. 3 8 7 6 16 V 4 F/F VREG 5 10 kΩ Dwg. No. ES-013 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. 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.