Micro-Power Comparator / Battery Monitor General Description The is a precision micro-power voltage comparator with an on-chip.v reference voltage source. Intended for voltage monitoring applications, the can be used with an external resistor divider to detect a wide range of voltages, or without external resistors to directly monitor voltages with its high input impedance CMOS input. The incorporates a voltage reference and comparator with fixed internal hysteresis. When the.v internal threshold is crossed, the output switches polarity. is available with a push-pull or open-drain output stage. The push-pull output stage is configured for both active high or active low output; the open-drain output stage is only configured active high. Supply current is extremely low (typically 1µA), making it ideal for portable applications. is supplied in Micrel s Teeny -lead SC- 7 package. Data sheets and support documentation can be found on Micrel s web site at www.micrel.com. Features Teeny Extremely low 1µA supply current (typical).v on chip reference ±% voltage threshold accuracy Optimized for PDAs, cellular telephones, pagers, and other battery-powered devices Open-drain output can be pulled up to 6V regardless of supply voltage -lead SC-7 package Applications PDAs Pagers Cordless phones Portable electronics Motherboards Bladed servers Typical Applications V IN 3.3V R1 R V V REF =.V.7V < <.V Memory power Lithium Coin Cell to Host Threshold Detector with Internal Fixed Hysteresis Nano-Power Battery Monitor Teeny is a trademark of Micrel, Inc. Micrel Inc. 18 Fortune Drive San Jose, CA 9131 USA tel +1 (8) 9-8 fax + 1 (8) 7-1 http://www.micrel.com July M9999-7
Ordering Information Part Number Temperature Range Package Standard Marking Pb-Free Marking* HBC B19 HYC B19 to +8 C SC-7 LBC B LYC B to +8 C SC-7 NBC B1 NYC B1 to +8 C SC-7 * Note: Underscore on device marking indicates Pb-Free packaging. Pin Configuration NIC 3 1 VDD SC-7- (C) (TOP VIEW) Pin Description Pin Number Pin Name Pin Function 1 NIC No Internal Connection. A signal applied to this pin will have no effect on device operation. Ground 3 Input: Analog input to the comparator. When V > V REF + V HYST, V is asserted, and the condition is held until V < V REF. ( N Version) ( H Version) ( L Version) Output: Active-high, open-drain output. This output is low when V < V REF, indicating a low voltage input. The output is high when V > V REF + V HYST. Output: Active-high, Push-pull output. This output is low when V < V REF, indicating a low voltage condition. The output is high when V > V REF + V HYST. Output: Active-low, Push-pull output. This output is high when V < V REF, indicating a low voltage condition. The output is low when V > V REF + V HYST. VDD Power Supply (Input): Independent supply input for internal circuitry. July M9999-7
Absolute Maximum Ratings (1) Supply Voltage ( )...-.3V to +6V Input Voltage (V )...-.3V to +6V Output Current (I )... ma Junction Temperature (T J )... C to +1 C Storage Temperature (T s )... 6 C to +1 C Lead Temperature (soldering, sec.)...6 C ESD Rating (3)...3kV Operating Ratings () Supply voltage ( )... +.7V to +.V Input Voltage...-.3 to 6V Ambient Temperature (T A )... C to +8 C Junction to Ambient Thermal Resistance: SC-7 (θ JA )... C/W Electrical Characteristics.7V < <.V; T A = C, Bold values indicate C< T A < +8 C, unless noted. Parameter Parameter Conditions Min Typ. Max Units I DD Supply Current No load on output 1 3 µa I Input Leakage Current =.V, V = V. 1 na I _PD Input Leakage Current in power down = V (note ), V =.V. 1 na V REF V REF C to 8 C...6 V V HYST Comparator Hysteresis 8 mv V Output Voltage, N I SINK = 1.6mA, VDD.7V.3 V V t D Output Voltage, L and H Propagation Delay I SINK = 1.6mA, VDD.7V.3 V I SOURCE = µa, VDD.7V.9.99 V =.7V to.v 1 39 µs V =.V to.7v 8 6 µs Notes: 1. Exceeding the absolute maximum rating may damage the device.. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.k in series with 1pF.. VDD is tied to Gnd, not left floating. V July 3 M9999-7
Typical Characteristics I DD vs. Temperature I IN vs. Temperature IDD (na) 8 6 =.V V IN = V = V V IN =.V - - - 6 8 1 1 - -1-1 = V V IN =.V =.V V IN = V - - - 6 8 IDD (na) 1 1 8 6 I DD vs. Temperature = 3V V IN =.V = V V IN =.V - - - 6 8 8 6 I IN vs. Temperature = V V IN =.V = 3V V IN =.V - - - 6 8 July M9999-7
Block Diagrams V TH 3 High-Voltage Detect V TH 3 High-Voltage Detect.V Bandgap Reference.V Bandgap Reference H L V TH 3 High-Voltage Detect.V Bandgap Reference N V V V REF + Hysteresis VREF + Hysteresis VREF VREF Type H and N Type L July M9999-7
Application Information Output The N output is an open-drain MOSFET, so most applications will require a pull-up resistor. It is recommended that the value of this resistor not exceed 7kΩ, otherwise PCB leakages may begin to dominate and give a false output indication. The output of N type devices may be pulled up as high as 6V regardless of the IC s supply voltage, without damage to the IC. The H and L versions of have push-pull output stages, no pull-up resistors are required. The maximum output voltage of the H and L versions is. Input has been designed to present an almost infinite input resistance at its pin making it ideal for monitoring lithium coin cell and back-up batteries. In applications where the battery low voltage is.v, s pin may be tied directly to the cell s positive terminal without any additional circuitry. s input may be subjected to voltages as high as 6V, steady-state, without any adverse effects, regardless of the IC s supply voltage. This applies even if the supply voltage is zero. This permits a situation wherein the IC s supply is turned off, but an input voltage is still present. Under such conditions, there will be no conduction from to or any circuitry internal to. Input Transients is inherently immune to very short negative-going glitches. Very brief transients may exceed the V threshold without tripping the output. As shown in the figure below, the narrower the transient, the deeper the threshold overdrive that will be ignored by the. The graph represents the typical allowable transient duration for a given amount of threshold overdrive that will not generate an output. 16 1 1 1 8 6 Input Transient Response 6 8 1 COMPARATOR OVERDRIVE V REF - V (mv) July 6 M9999-7
Package Information.6 (.6) BSC. (.87) 1.8 (.71) 1.3 (.3) 1.1 (.) 1. (.39).8 (.3). (.9) 1.8 (.71) 1.1 (.3).8 (.3) DIMENSIONS: MM (INCH).18 (.7).1 (.).3 (.1).1 (.6).1 (.). (.) SC-7- (C).3 (.1).1 (.) MICREL, INC. 18 FORTUNE DRIVE SAN JOSE, CA 9131 USA TEL +1 (8) 9-8 FAX +1 (8) 7-1 WEB http:/www.micrel.com This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. Micrel, Inc. July 7 M9999-7