GS8743-TR

GS8743 6ns,Low-Power,Rail-to-Rail Input Single-Supply Comparator Features  Ultra-Fast, 6ns Propagation Delay  Internal Hysteresis for Clean Switching  1.3mA (Typ) Low Power Consumption  No Phase Reversal for Overdriven Inputs  Single-Supply Operation from +2.7V ~ +5.5V  Operating Temperature: -40°C ~ +85°C  Low Offset Voltage: 5mV (Max)  Small Package:  Rail-to-Rail Input and Output GS8743 Available in SOT23-5 and SC70-5 Packages  CMOS/TTL-Compatible Output General Description The GS8743 is low-power, ultra-high-speed comparators with internal hysteresis, optimized for systems powered from a 3V or 5V supply. The device features high-speed response, low-power consumption, low offset voltage, and rail-to-rail input and output range. Propagation delay is 6ns (100mV overdrive), while supply current is 1.3mA per comparator. The internal input hysteresis eliminates output switching due to internal input noise voltage. The maximum input offset voltage is 5mV, and the operating range is from 2.7V to 5.5V. All devices are specified for the temperature range of -40℃ to +85℃.The GS8743 single is available in Green SC70-5 and SOT23-5 packages. Applications  High-speed Line or Digital Line Receivers  Clock and Data Signal Restoration  High Speed Sampling Circuits  Window Comparators  Peak and Zero-crossing Detectors  IR Receivers  Logic Level Shifting or Translation  Portable Systems Pin Configuration Figure 1. Pin Assignment Diagram September 2020-REV_V0 1/10 GS8743 Absolute Maximum Ratings Condition Min Max -0.5V +7.5V Analog Input Voltage (IN+ or IN-) Vss-0.5V VDD+0.5V PDB Input Voltage Vss-0.5V +7V -40°C +85°C Power Supply Voltage (VDD to Vss) Operating Temperature Range Junction Temperature +160°C Storage Temperature Range -55°C Lead Temperature (soldering, 10sec) +150°C +260°C Package Thermal Resistance (TA=+25℃) SOT23-5, θJA 190°C/W SOT23-6, θJA 190°C/W SC70-5, θJA 333°C/W ESD Susceptibility HBM 4KV MM 300V Note: Stress greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions outside those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Package/Ordering Information PACKAGE PACKAGE MARKING DESCRIPTION OPTION INFORMATION GS8743-CR SC70-5 Tape and Reel,3000 8743 GS8743-TR SOT23-5 Tape and Reel,3000 8743 MODEL CHANNEL ORDER NUMBER GS8743 Single September 2020-REV_V0 2/10 GS8743 Electrical Characteristics (At VS = +5V, VCM = 0V, CL = 15pF, and TA = +25℃, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS TYP MIN MAX UNITS 5 mV INPUT CHARACTERISTICS Input Offset Voltage VOS VCM = 0V 0.4 Input Bias Current IB 6 pA Input Offset Current IOS 4 pA Input Hysteresis Vhys 3 mV Common-Mode Voltage Range VCM -0.1 to +5.6 V Common-Mode Rejection Ratio CMRR VS = 5.5V VS = 5V, VCM = 0V to 5V 77 60 dB OUTPUT CHARACTERISTICS Output Voltage Swing from Rail Output Short-Circuit Current VOH VOL ISOURCE ISINK Vs=5V, IO = 4mA VS = 5V, Out to VS/2 Vs - 0.166 Vs - 0.25 V 132 211 mV 42.6 30 43.7 31 mA POWER SUPPLY Operating Voltage Range Power Supply Rejection Ratio Quiescent Current / Comparator PSRR VS = +2.7V to +5.5V, VCM = 0V IQ 2.7 V 5.5 V 74 58 dB 1.3 mA VS = 3V, Overdrive = 10mV 11 ns VS = 3V, Overdrive = 100mV 6 ns VS = 3V, Overdrive = 10mV 11 ns VS = 3V, Overdrive = 100mV 6 ns VS = 3V, Overdrive = 10mV 3.6 ns VS = 3V, Overdrive = 100mV 3.5 ns VS = 3V, Overdrive = 10mV 3.1 ns VS = 3V, Overdrive = 100mV 3 ns DYNAMIC PERFORMANCE (CL = 15pF) Propagation Delay (Low to High) Propagation Delay (High to Low) Rise Time Fall Time TdLH TdHL Tr Tf September 2020-REV_V0 3/10 GS8743 Typical Performance characteristics At TA=+25oC, VS=+5V, and CL=15pF, unless otherwise noted. Sinusoid Response at 0.2MHz VOUT(1V/div) IQ(0.1mA/div) VIN(200mV/div) Supply Current vs. Temperature Time(1us/div) o temperature(25 C/div) Small Signal Inverting Pulse Response ISOURCE(5mA/div) ISINK(5mA/div) Output Short-Circuit (Source) Current vs. Temperature temperature(25oC/div) o temperature(25 C/div) Progation Delay (L-H&H-L) VOUT(1V/div) VOUT(1V/div) VIN(25mV/div) VIN(200mV/div) Progation Delay (L-H&H-L) Time(50ns/div) Time(50ns/div) September 2020-REV_V0 4/10 GS8743 Application Note Size GS8743 comparator is low-power, ultra-high-speed and suitable for a wide range of general-purpose applications. The small footprints of the GS8743 package saves space on printed circuit boards and enable the design of smaller electronic products. The GS8743 interfaces directly to CMOS and TTL logics. Power Supply Bypassing and Board Layout GS8743 operates from a single 2.7V to 5.5V supply or dual ±1.35V to ±2.75V supplies. For best performance, a 0.1μF ceramic capacitor should be placed close to the VDD pin in single supply operation. For dual supply operation, both VDD and VSS supplies should be bypassed to ground with separate 0.1μF ceramic capacitors. Low Supply Current The low supply current (typical 1.3mA per channel) of GS8743 will help to maximize battery life. They are ideal for battery powered systems. Operating Voltage GS8743 operates under wide input supply voltage (2.7V to 5.5V). In addition, all temperature specifications apply from -40 oC to +85 oC. Most behavior remains unchanged throughout the full operating voltage range. These guarantees ensure operation throughout the single Li-Ion battery lifetime Rail-to-Rail Input The input common-mode range of GS8743 extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). This is achieved by using complementary input stage. For normal operation, inputs should be limited to this range. Internal Hysteresis Because of noise or undesired parasitic feedback, high-speed comparators oscillate in the linear region. Oscillation tends to occur when the voltage on one input is at or equal to the voltage on the other input. The SGM8744 family eliminates this undesired oscillation by integrating an internal hysteresis of 5mV. The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling input voltage (Figure 2). The difference between two trip points is the hysteresis, while the average of two trip points is the offset voltage. When the comparator’s input voltages are equal, the hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. VINP VTH VHYS VOS VINM VTL VOS=|(VTH+VTL)/2-VINM| Figure 2. Comparator’s hysteresis and offset External Hysteresis Greater flexibility in selecting hysteresis is achieved by using external resistors. Hysteresis reduces output chattering when one input is slowly moving past the other. September 2020-REV_V0 5/10 GS8743 Non-Inverting Comparator with Hysteresis Figure 3. Non-Inverting Comparator with Hysteresis A non-inverting comparator with hysteresis requires a two-resistor network, as shown in Figure 3 and a voltage reference (VR) at the inverting input. VTH  RG  RF  VR RF VTL  RG  RF R  VR  G  VDD RF RF VHYS  RG  VDD RF Inverting Comparator with Hysteresis Figure 4. Inverting Comparator with Hysteresis The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator supply voltage (VDD), as shown in Figure 4. VTH  RG2  VDD RG1 || RF  RG2 VTL  RG2 || RF  VDD RG2 || RF  RG1 VHYS  RG1 || RG2  VDD RG1 || RG2  RF September 2020-REV_V0 6/10 GS8743 Typical Application Circuits Line Receiver A Line Receiver using GS8743 is shown in Figure 5. Resistors RG1 and RG2 set the bias point at the comparator's inverting input. RIN should be same as RG1||RG2 to get a better match. GS8743 detects the voltage of the Coax Line, and outputs logic high or logic low quickly with no glitch. Figure 5. Line Receiver IR Receiver GS8743 is an ideal candidate to be used as an infrared receiver shown in Figure 6. The infrared photo diode creates a current relative to the amount of infrared light present. The current creates a voltage across RIN. When this voltage level cross the voltage applied by the voltage divider to the inverting input, the output transitions. Optional RF provides additional hysteresis for noise immunity. Figure 6. IR Receiver September 2020-REV_V0 7/10 GS8743 Oscillator A oscillator using GS8743 is shown in Figure 7. Resistors RG1 and RG2 set the bias point at the comparator's inverting input. The period of oscillator is set by the time constant of RC and CIN. The maximum frequency is limited by the large signal propagation delay of the comparator. GS8743 is low propagation delay guarantees the high frequency oscillation. If RG1=RG2= RF, then the frequency of the oscillator is: f OSC  1 2  ln 2  RC  C IN Figure 7. Oscillator September 2020-REV_V0 8/10 GS8743 Package Information SOT23-5 September 2020-REV_V0 9/10 GS8743 SC70-5 September 2020-REV_V0 10/10