XD7555

XD7555 DIP8 / XL7555 SOP8 Features The XD/XL7555 and 7556 are CMOS RC timers providing significantly improved performance over the standard 555NE and 355 timers, while at the same time being direct replacements for those devices in most applications. Improved parameters include low supply current, wide operating supply voltage range, low Threshold, Trigger and Reset currents, no crowbarring of the supply current during output transitions, higher frequency performance and no requirement to decouple Control Voltage for stable operation. • Exact equivalent in most cases for 555NE or XD555 • Low supply current - XD/XL7555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60µA - 7556 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120µA • Extremely low input currents . . . . . . . . . . . . . . . . . . . . . . 20pA • High speed operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz Specifically, the XD/XL7555 and 7556 are stable controllers capable of producing accurate time delays or frequencies. The 7556 is a dual XD/XL7555, with the two timers operating independently of each other, sharing only V+ and GND. In the one shot mode, the pulse width of each circuit is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled by two external resistors and one capacitor. Unlike the regular bipolar 555NE devices, the Cont rol Voltage terminal need not be decoupled with a capacitor. The circuits are triggered and reset on falling (negative) waveforms, and the output inverter can source or sink currents large enough to drive TTL loads, or provide minimal offsets to drive CMOS loads. • Guaranteed supply voltage range . . . . . . . . . . . . . . 2V to 18V • Temperature stability . . . . . . . . . . . . . 0.005%/°C at +25°C • Normal reset function - no crowbarring of supply during output transition • Can be used with higher impedance timing elements than regular 555/556 for longer RC time constants • Timing from microseconds through hours • Operates in both astable and monostable modes • Adjustable duty cycle • High output source/sink driver can drive TTL/CMOS • Outputs have very low offsets, HIGH and LOW • Pb-free (RoHS Compliant) Applications • Precision timing • Pulse generation • Sequential timing • Time delay generation • Pulse width modulation • Pulse position modulation • Missing pulse detector Pin Configurations GND 1 XD/XL7555 (8 LD PDIP, SOIC) 7556 (14 LD PDIP, CERDIP) TOP VIEW TOP VIEW 8 VDD TRIGGER 2 7 DISCHARGE OUTPUT 3 6 THRESHOLD RESET 4 DISCHARGE1 1 14 VDD THRESHOLD1 2 13 DISCHARGE2 CONTROL 3 VOLTAGE1 12 THRESHOLD2 RESET1 4 OUTPUT1 5 5 CONTROL VOLTAGE TRIGGER1 6 GND 7 1 11 CONTROL VOLTAGE2 10 RESET2 9 OUTPUT2 8 TRIGGER2 XD7555 DIP8 / XL7555 SOP8 Absolute Maximum Ratings Thermal Information Thermal Resistance (Typical, Notes 5, 6) JA (°C/W) JC (°C/W) 14 Ld CERDIP Package . . . . . . . . . . . . . . . 80 24 14 Ld PDIP Package* . . . . . . . . . . . . . . . . 115 46 8 Ld PDIP Package* . . . . . . . . . . . . . . . . . 130 69 8 Ld SOIC Package. . . . . . . . . . . . . . . . . . . 170 67 Maximum Junction Temperature (Hermetic Package) . . . . . . . . . . . .+175°C Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150°C Operating Conditions Maximum Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C Temperature Range * Pb-free PDIPs can be used for through-hole wave solder XD/XL7555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C processing only. They are not intended for use in Reflow solder XD/XL7555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 25°C to +85°C processing applications. 7555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V Input Voltage Trigger, Control Voltage, Threshold, Reset (Note 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ +0.3V to GND -0.3V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 4. Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater than V+ +0.3V or less than V- -0.3V may cause destructive latch-up. For this reason it is recommended that no inputs from external sources not operating from the same power supply be applied to the device before its power supply is established. In multiple supply systems, the supply of the XD/XL7555 and 7556 must be turned on first. 5. JA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 6. For JC, the “case temp” location is taken at the package top center. Electrical Specifications (Note 8) -55°C TO+125°C TA = +25°C PARAMETER Static Supply Current SYMBOL IDD TEST CONDITIONS TYP MAX MAX UNIT 40 200 300 µA VDD = 15V 60 300 300 µA VDD = 5V 80 400 600 µA VDD = 15V 120 600 600 µA XD/XL7555 V DD = 5V 7556 Monostable Timing Accuracy MIN RA = 10k, C = 0.1µF, VDD = 5V MIN TYP 2 % 858 Drift with Temperature (Note 7) 1161 VDD = 5V 150 ppm/°C VDD = 10V 200 ppm/°C VDD = 15V 250 ppm/°C 0.5 %/V Drift with Supply (Note 7) VDD = 5V to 15V Astable Timing Accuracy RA = RB = 10k, C = 0.1µF, VDD = 5V 0.5 2 % 1717 Drift with Temperature (Note 7) Drift with Supply (Note 7) Threshold Voltage µs 2323 µs VDD = 5V 150 ppm/°C VDD = 10V 200 ppm/°C VDD = 15V 250 ppm/°C 0.5 %/V VDD = 5V to 15V 0.5 V TH VDD = 15V 62 67 71 61 72 % VDD Trigger Voltage VTRIG VDD = 15V 28 32 36 27 37 % VDD Trigger Current ITRIG VDD = 15V 10 50 nA Threshold Current ITH VDD = 15V 10 50 nA Control Voltage VCV VDD = 15V 72 % VDD 62 2 67 71 61 XD7555 DIP8 / XL7555 SOP8 Electrical Specifications (Note 8) -55°C TO+125°C TA = +25°C PARAMETER SYMBOL TEST CONDITIONS MIN TYP MIN 1.0 0.2 TYP MAX UNIT 1.2 V Reset Voltage VRST VDD = 2V to 15V Reset Current IRST VDD = 15V 10 50 nA Discharge Leakage IDIS VDD = 15V 10 50 nA Output Voltage VOL VDD = 15V, ISINK = 20mA 0.4 1.0 1.25 V VDD = 5V, ISINK = 3.2mA 0.2 0.4 0.5 V VOH Discharge Output Voltage VDIS 0.4 MAX VDD = 15V, ISOURCE = 0.8mA 14.3 14.6 14.2 V VDD = 5V, ISOURCE = 0.8mA 4.0 4.3 3.8 V VDD = 5V, ISINK = 15mA 0.2 0.4 VDD = 15V, ISINK = 15mA Supply Voltage (Note 7) VDD Functional Operation 2.0 18.0 3.0 0.6 V 0.4 V 16.0 V Output Rise Time (Note 7) tR RL = 10M, CL = 10pF, VDD = 5V 75 ns Output Fall Time (Note 7) tF RL = 10M, CL = 10pF, VDD = 5V 75 ns VDD = 5V, RA = 470Ω, RB = 270Ω, C = 200pF 1 MHz Oscillator Frequency (Note 7) fMAX NOTES: 7. These parameters are based upon characterization data and are not tested. 8. Applies only to military temperature range product (M suffix). Functional Diagram VDD 8 R THRESHOLD 6 5 CONTROL VOLTAGE 4 FLIP-FLOP RESET OUTPUT DRIVERS COMPARATOR A + - 3 7 R DISCHARGE n + TRIGGER 2 OUTPUT 1 COMPARATOR B 1 GND R NOTE: This functional diagram reduces the circuitry down to its simplest equivalent components. Tie down unused inputs. FIGURE 1. FUNCTIONAL DIAGRAM TRUTH TABLE THRESHOLD VOLTAGE TRIGGER VOLTAGE RESET Don’t Care Don’t Care Low Low On >2/3(V+) >1/3(V+) High Low On 1/3(V+) High Stable Stable Don’t Care