Not Recommended for New Designs The MAX900 was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. A Maxim replacement or an industry second-source may be available. The data sheet remains available for existing users. The other parts on the following data sheet are not affected. For further information, please see the QuickView data sheet for this part or contact technical support for assistance.
19-2887; Rev. 5; 2/05 High-Speed, Low-Power Voltage Comparators Features The MAX900–MAX903 high-speed, low-power, single/ dual/quad voltage comparators feature differential analog inputs and TTL-logic outputs with active internal pullups. Fast propagation delay (8ns typ at 5mV overdrive) makes the MAX900–MAX903 ideal for fast A/D converters and sampling circuits, line receivers, V/F converters, and many other data-discrimination applications.
MAX900–MAX903 High-Speed, Low-Power Voltage Comparators ABSOLUTE MAXIMUM RATINGS Internal Power Dissipation................................................500mW Derate above +100°C ................................................10mW/°C Operating Temperature Ranges: MAX900–MAX903_C_ _ .......................................0°C to +70°C MAX900–MAX903_E_ _ ....................................-40°C to +85°C Junction Temperature........................................-65°C to +160°C Storage Temperature Range .
High-Speed, Low-Power Voltage Comparators (VCC = +5V, VEE = -5V, VDD = +5V, LE1–LE4 = logic high, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX900A/MAX901A MAX900B/MAX901B MIN TYP MAX MAX902 MIN MAX903 TYP MAX MIN TYP UNITS MAX Positive Analog Supply Current ICC (Note 7) 10 15 5 8 2.5 4 mA Negative Analog Supply Current IEE (Note 7) 7 12 3.5 6 2 3 mA Digital Supply Current IDD (Note 7) 4 6 2 3 1 1.
MAX900–MAX903 High-Speed, Low-Power Voltage Comparators ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = -5V, VDD = +5V, LE1–LE4 = logic high, TA = full operating temperature, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX900A/MAX901A MIN TYP MAX MAX900B/MAX901B/ MAX902/MAX903 MIN TYP MAX UNITS VOS VCM = 0, VO = 1.4V 1 3 2 6 mV IB IIN+ or IIN- 4 10 6 15 µA Input Offset Current IOS VCM = 0, VO = 1.4V 100 500 200 800 nA Input Voltage Range VCM (Note 1) VCC 2.
High-Speed, Low-Power Voltage Comparators (VCC = +5V, VEE = -5V, VDD = +5V, LE1–LE4 = logic high, TA = full operating temperature, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX900A/MAX901A/ MAX900B/MAX901B MIN TYP MAX MAX902 MAX903 UNITS MIN TYP MAX MIN TYP MAX Positive Analog Supply Current ICC (Note 7) 10 25 5 12 2.5 6 mA Negative Analog Supply Current IEE (Note 7) 7 20 3.5 10 2 5 mA Digital Supply Current IDD (Note 7) 4 10 2 5 1 2.
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) INPUT BIAS CURRENT vs. TEMPERATURE 0 -1 -2 3.5 3.0 2.5 20 40 60 80 100 120 TA = -55°C 0.4 0.3 0.2 TA = +25°C 0.1 -40 -20 0 TA = +125°C 20 40 60 80 100 120 2 4 6 10 IINPUT OVERDRIVE vs. tpd+ RESPONSE TIME INPUT OVERDRIVE vs. tpd- RESPONSE TIME TA = +125°C 2.8 TA = +25°C 3 0 INPUT VOLTAGE 1 2.2 TA = -55°C 1.8 4 5 6 7 8 9 2mV 2 2.4 2.
High-Speed, Low-Power Voltage Comparators MAX900 MAX901 PIN NAME FUNCTION 1, 10, 11, 20 IN- (A, B, C, D) 2, 9, 12, 19 IN+ (A, B, C, D) 3 GND 4, 7, 14, 17 LATCH (A, B, C, D) Latch Input (Channels A, B, C, D) 5, 6, 15, 16 OUT (A, B, C, D) 8 PIN NAME Negative Input (Channels A, B, C, D) 1, 8, 9, 16 IN- (A, B, C, D) Negative Input (Channels A, B, C, D) Positive Input (Channels A, B, C, D) 2, 7, 10, 15 IN+ (A, B, C, D) Positive Input (Channels A, B, C, D) 3 GND 4, 5, 12, 13 OUT (A,
MAX900–MAX903 High-Speed, Low-Power Voltage Comparators Applications Information pushes the output through the transition region cleanly, but applies a hysteresis in threshold seen at the input terminals. Circuit Layout Because of the large gain-bandwidth transfer function of the MAX900–MAX903, special precautions must be taken to realize their full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory.
High-Speed, Low-Power Voltage Comparators VOS Input Offset Voltage: Voltage applied between the two input terminals to obtain TTL-logic threshold (+1.4V) at the output. tpd+ (D) Latch Disable-to-Output High Delay: The propagation delay measured from the latch-signal crossing the TTL threshold in a low-to-high transition to the point of the output crossing TTL threshold in a low-to-high transition. VIN Input Voltage Pulse Amplitude: Usually set to 100mV for comparator specifications.
MAX900–MAX903 High-Speed, Low-Power Voltage Comparators COMPARE LATCH ENABLE INPUT COMPARE 1.4V LATCH LATCH DIFFERENTAL INPUT VOLTAGE VIN ts +5V LATCH tpw(D) th 0 OUTPUT VOS +5mV VDD VOS INPUT 100mV 5ns/div tpd+ (D) tpd- Figure 3. tpd+ Response Time to 5mV Overdrive 1.4V COMPARATOR OUTPUT Figure 2. MAX900/MAX902/MAX903 Timing Diagram VCC +5V +5V VDD +5V INPUT TO 10X SCOPE PROBE (10MΩ, 14pF) OUTPUT PRECISION STEP GENERATOR 0 100nF 10Ω RL 2.43kΩ 1kΩ D.U.T.
High-Speed, Low-Power Voltage Comparators MAX900–MAX903 OUTPUT 1V/div OUTPUT 1V/div INPUT 10mV/div INPUT 10mV/div 5ns/div 5ns/div Figure 6. Response to 50MHz Sine Wave Figure 7. Response to 100MHz Sine Wave Photo +1.25V VREF Typical Application IN1 MX7228 UNDER LIMIT VOUT1 VDAC1 OCTAL 8-BIT DAC OVER LIMIT IN2 IN3 UNDER LIMIT IN4 UNDER LIMIT The MX7228’s internal latches allow the system processor to set the limit points for each comparator independently and update them at any time.
MAX900–MAX903 High-Speed, Low-Power Voltage Comparators Ordering Information (continued) PART TEMP RANGE Pin Configurations (continued) PIN-PACKAGE TOP VIEW MAX901ACSE 0°C to +70°C 16 Narrow SO MAX901BCSE 0°C to +70°C 16 Narrow SO MAX901AEPE -40°C to +85°C 16 Plastic DIP MAX901BEPE -40°C to +85°C IN- (A) 1 20 IN- (D) IN+ (A) 2 19 IN+ (D) GND 3 16 Plastic DIP LATCH (A) 4 OUT (A) 5 MAX901AESE -40°C to +85°C 16 Narrow SO MAX901BESE -40°C to +85°C 16 Narrow SO MAX902CPD 0°C to +70°
