Micrel Manuals

The SY100S839V is a low skew ÷2/4, ÷4/5/6 clock generation chip designed explicitly for low skew clock generation applications. The internal dividers are synchronous to each other, therefore, the common output edges are all precisely aligned. The device can be driven by either a differential or single-ended ECL/LVECL or, if positive power supplies are used, PECL/LVPECL input signal. In addition, by using the VBB output, a sinusoidal source can be AC-coupled into the device. If a single- ended input is to be used, the VBB output should be connected to the /CLK input and bypassed to ground via a 0.01µF capacitor. The VBB output is designed to act as the switching reference for the input of the S839V under single-ended input conditions. As a result, this pin can only source/sink up to 0.5mA of current. The common enable (/EN) is synchronous so that the internal dividers will only be enabled/disabled when the internal clock is already in the LOW state. This avoids any chance of generating a runt clock pulse on the internal clock when the device is enabled/disabled as can happen with an asynchronous control. An internal runt pulse could lead to losing synchronization between the internal divider stages. The internal enable flip-flop is clocked on the falling edge of the input clock, therefore, all associated specification limits are referenced to the negative edge of the clock input. Upon s

The MIC5256 is an efficient, precise CMOS voltage regulator. It offers better than 1% initial accuracy, extremely low-dropout voltage (typically 135mV at 150mA) and low ground current (typically 90µA) over load. The MIC5256 features an error flag that indicates an output fault condition such as overcurrent, thermal shutdown and dropout. Designed specifically for handheld and battery-powered devices, the MIC5256 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The MIC5256 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turnoff. Available in the IttyBitty™ SOT-23-5 package and the new Thin SOT-23-5, which offers the same footprint as the standard IttyBitty™ SOT-23-5, but only 1mm tall. The MIC5256 offers a range of output voltages.

MIC5014/5015 is an N-channel enhancement-mode power MOSFET driver from Micrel. It supports a supply voltage of 2.75V to 30V and can output up to 30V. The driver has a TTL compatible control input and supports noninverting and inverting operation modes.

The MIC5233 is a highly accurate, low dropout regulator with high input voltage and ultra-low ground current. This combination of high voltage and low ground current makes the MIC5233 ideal for multi-cell Li-Ion battery systems.

The MIC2210 is a Micrel dual low dropout regulator with an open-drain driver and power-on reset circuit.

The Micrel MIC2177 is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications. It operates from a 4.5V to 16.5V input and can supply up to 2.5A output current. The regulator can operate in PWM or skip mode, depending on the output conditions, to achieve high efficiency over a wide output current range. It features a shutdown mode that reduces quiescent current to less than 5µA. The MIC2177 uses current-mode control with internal current sensing, providing superior line regulation and easy compensation of the control loop. It is protected against pulse-by-pulse current limiting and thermal shutdown. The output is turned off when the input voltage is less than 4.5V. The MIC2177 is packaged in a 20-lead wide power SO package with an operating temperature range of –40°C to +85°C.

The SY10/100EL57 is a fully differential 4:1 multiplexer that can also be used as a differential 2:1 multiplexer. It is ideal for low skew applications such as clock distribution.

The MIC2546/2547 dual programmable current limit switch is optimized for low loss dc power switching and other power management applications, including Advanced Configuration and Power Interface (ACPI).

The MIC5012 is the dual member of the Micrel MIC501X driver family. These ICs are designed to drive the gate of an N-channel power MOSFET above the supply rail in high- side power switch applications. The 14-pin MIC5012 is extremely easy to use, requiring only a power FET and nominal supply decoupling to implement either a high- or low-side switch. The MIC5012 charges a 1nF load in 60µs typical. Operation down to 4.75V allows the MIC5012 to drive standard MOSFETs in 5V low-side applications by boosting the gate voltage above the logic supply. In addition, multiple, paral- leled MOSFETs can be driven by a single MIC5012 for ultra- high current applications. Other members of the Micrel driver family include the MIC5010 full-featured driver, MIC5011 minimum parts count driver, and MIC5013 protected 8-pin driver. For new designs, Micrel recommends the pin-compatible MIC5016 dual MOSFET driver.

This document is an introduction to the Mitel MH88622 product. It mainly introduces the features of the product, including dual line interface circuit, 2-4 wire conversion, constant current supply, battery supply to the line, current overload protection, etc.

SY100S839V is a low skew ÷2/4, ÷4/5/6 clock generation chip designed explicitly for low skew clock generation applications.

The SY89228U is a precision, low jitter 1GHz ÷3, ÷5 clock divider with an LVPECL output. A unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the input clock voltage swing drops significantly below 100mV or input is removed. The differential input includes Micrel’s unique, 3-pin internal termination architecture that allows the input to interface to any differential signal (AC- or DC- coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100K- compatible LVPECL with fast rise/fall times guaranteed to be less than 270ps. The SY89228U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY89228U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at: www.micrel.com.

The SY88822V is a high speed current switch for driving a semiconductor laser diode in optical transmission applications. It supports 3.3V or 5V single power supply, up to 155Mbps operation, modulation current up to 30mA, PECL output enable, differential PECL inputs, and a tiny 10-pin (3mm) MSOP package.

This document provides information on the approved crystal manufacturers by Micrel Semiconductor and their testing requirements. It also includes the common crystal frequencies used with Micrel receivers and the corresponding formulas.