TLC551, TLC551Y LinCMOS TIMERS SLFS044B - FEBRUARY 1984 - REVISED SEPTEMBER 1997 D D D D D D D D D D, DB, P, OR PW PACKAGE (TOP VIEW) Very Low Power Consumption 1 mW Typ at VDD = 5 V Capable of Operation in Astable Mode GND TRIG OUT RESET CMOS Output Capable of Swinging Rail to Rail High Output-Current Capability Sink 100 mA Typ Source 10 mA Typ VDD 8 THRES 6 CONT 5 R 7 3 6 4 5 VDD DISCH THRES CONT RESET 4 R1 R Single-Supply Operation From 1 V to 15 V 3 1 R TRIG 2 R 7 description OUT S Functionally Interchangeable With the NE555; Has Same Pinout ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015.2 8 2 functional block diagram Output Fully Compatible With CMOS, TTL, and MOS Low Supply Current Reduces Spikes During Output Transitions 1 DISCH 1 GND The TLC551 is a monolithic timing circuit RESET can override TRIG, which can override THRES. fabricated using the TI LinCMOSprocess. The timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. Compared to the NE555 timer, this device uses smaller timing capacitors because of its high input impedance. As a result, more accurate time delays and oscillations are possible. Power consumption is low across the full range of power supply voltage. Like the NE555, the TLC551 has a trigger level equal to approximately one-third of the supply voltage and a threshold level equal to approximately two-thirds of the supply voltage. These levels can be altered by use of the control voltage terminal (CONT). When the trigger input (TRIG) falls below the trigger level, the flip-flop is set and the output goes high. If TRIG is above the trigger level and the threshold input (THRES) is above the threshold level, the flip-flop is reset and the output is low. The reset input (RESET) can override all other inputs and can be used to initiate a new timing cycle. If RESET is low, the flip-flop is reset and the output is low. Whenever the output is low, a low-impedance path is provided between DISCH and GND. All unused inputs should be tied to an appropriate logic level to prevent false triggering. While the CMOS output is capable of sinking over 100 mA and sourcing over 10 mA, the TLC551 exhibits greatly reduced supply-current spikes during output transitions. This minimizes the need for the large decoupling capacitors required by the NE555. The TLC551C is characterized for operation from 0C to 70C. This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C, Method 3015; however, it is advised that precautions be taken to avoid application of any voltage higher than maximum-rated voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level, preferably either supply voltage or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments. LinCMOS is a trademark of Texas Instruments Incorporated. Copyright 1997, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 TLC551, TLC551Y LinCMOS TIMERS SLFS044A - FEBRUARY 1984 - REVISED MAY 1997 AVAILABLE OPTIONS PACKAGED DEVICES TA VDD RANGE SMALL OUTLINE (D) 0C to 70C 1 V to 16 V TLC551CD CHIP FORM (Y) SSOP (DB) PLASTIC DIP (P) TSSOP (PW) TLC551CDBLE TLC551CP TLC551CPWLE TLC551Y The D package is available taped and reeled. Add the suffix R (e.g., TLC551CDR). The DB and PW packages are only available left-end taped and reeled (indicated by the LE suffix on the device type; e.g., TLC551CDBLE). Chips are tested at 25C. FUNCTION TABLE RESET VOLTAGE TRIGGER VOLTAGE THRESHOLD VOLTAGE OUTPUT DISCHARGE SWITCH MAX MAX >MAX >MAX Low On >MAX >MAX