Watchdog IC features low-power sleep mode.

With a battery switch-over sensor output and sleep-mode input, the V6175 watchdog IC serves as a microprocessor reset. Its power consumption is 25 µA in standby mode or <1 µA in sleep mode. The supply voltage input is independent of the battery switch-over. The device, which operates over a temperature range of 40 to +125°C, guarantees reset as low as 1.2V and provides a 1.275V precision reference. In 14-pin DIP and SO versions, the part costs $1.15 (100,000). EM Microelectronic USA, Rolling Meadows, IL. (708) 981-4751.

Dc/dc converter operates at 120 kHz.

Pin-compatible with the industry-standard 7660, the TC7660H dc/dc converter offers higher frequency operation. Because the TC7660H operates at 120 kHz, significantly smaller capacitors can be used, thus reducing board space and weight. Two external 1.0-µF capacitors are needed to operate the device. The converter features an input voltage range of 1.5 to 10V, 85% power efficiency, and 99.7% voltage conversion. It comes in 8-pin plastic DIPs and SOIC configurations, with prices starting at $1.39 and $1.46, respectively (1000). Telcom Semiconductor Inc, Mountain View, CA. (415) 968-9241.

IC controls disk-drive head position and motor speed.

Aimed at the cost-sensitive disk-drive market, the 32H6840 mixed-signal IC implements both the servo head-positioning and spindle motor-control subsystems in a single 128-lead QFP. The device also contains a 15-MIPS DSP core that is code-compatible with the TMS320C25 and employs a 1568-word configurable RAM for program and data storage. The 32H6840 operates from a single 5V supply and works with Silicon Systems' PRML 32P49XX read-channel ICs. It costs about $12 (1000). Silicon Systems, Tustin, CA. (714) 573-6200.

1-Mbit SRAM performs tag-compare function.

You can use the MCM69T618 1-Mbit synchronous SRAM as an address tag for 512-kbyte or 1- or 2-Mbyte Level-2 or -3 cache implementations. The cache-tag RAM stores address portions, or tags, that identify information in the data RAM. You can also use the 64k×18-bit device as data RAM. Housed in a plastic BGA package, the 3.3V SRAM offers clock-to-match times as low as 5 nsec. The MCM-69T618 costs $51.25 (1000). Motorola Microprocessor and Memory Technologies Group, Austin, TX. (512) 993-7726.

IC manages rechargeable alkaline batteries.

In an eight-pin, 150-mil SOIC or 300-mil DIP, the bq2902 manages the charge and discharge cycles of two AAA, AA, C, or D rechargeable alkaline batteries. By individually monitoring each cell, the bq2902 ensures that overcharging or deep discharges do not damage the batteries. The device provides three selectable end-of-discharge voltages and an LED status output to indicate charge in progress, charge complete, or fault conditions. The bq2902 costs $1.86 in SOIC and $1.75 in DIP configurations (5000). Benchmarq Microelectronics Inc, Dallas, TX. (214) 437-9195.

Serial transceivers are software-programmable.

Using a 4-bit control word, you can configure the SP502 and SP503 serial-interface transceivers for RS-232C, V.35, RS-449, EIA-530, RS-422, or RS-485 operation. The SP502 contains six drivers and seven receivers for DTE applications. The SP503 has seven driver/receiver pairs, and you can use the device for either DTE or DCE communications. Each of the ICs comes in an 80-pin plastic QFP and costs $14.50 (1000). Sipex Corp, Billerica, MA. (508) 667-8700.

Op amp delivers 2A from surface-mount housing.

The OPA544F op amp comes in a surface-mount or five-lead TO-220 plastic package for low-profile, high-density applications. It combines FET-input circuitry and a 2A output stage on a monolithic chip. The device, which operates over a supply range of ±10 to ±35V, slews 8 V/µsec and has a maximum input-bias current of 100 pA. Operating temperature range for both package types is -40 to +85°C. Prices start at $6.95 (100). Burr-Brown Corp, Tucson, AZ. (602) 746-1111.

Instrument amp offers selectable gain.

Operating from supplies as low as ±2.25V, the INA2141 instrumentation amp features a 750-µA quiescent current, which suits battery-operated systems. The device, which contains three op amps on one chip, lets you set gains of 10 or 100 without external resistors. The INA2141 is accurate to within ±0.05% at a gain of 10. Other specifications include a 50-µV (max) offset voltage and a 0.5-µV/°C (max) drift. The INA2141 comes in a 16-pin plastic DIP or a SOL-16 surface-mount package and costs $6.50 (1000). Burr-Brown Corp, Tucson, AZ. (602) 746-1111.

Quadrature modulator MMIC suits wireless equipment.

In addition to an on-chip phase shifter, the UPC8105GR quadrature modulator offers a 400-MHz modulator-output bandwidth and 10-MHz IQ bandwidth. The device operates at supply voltages of 2.7 to 5.5V, and you can use it in digital cordless and cellular phones, as well as wireless LANs. The modulator draws 16 mA at 3V and comes in a 16-pin SSOP and costs $3.90. California Eastern Laboratories, Santa Clara, CA. (408) 988-3500.

Resonant-mode controller simplifies power-supply design.

Operating over a programmable frequency range of 100 kHz to 1 MHz, the CS-360 control IC contains the key elements for building a resonant-mode power supply. Although it operates at high frequencies, the CS-360 uses soft switching to minimize many of the problems associated with conventional PWM supplies, such as switching and conduction losses. The CS-360 performs zero-current switching with constant on-time, and a companion part, the CS-361, performs zero-voltage switching with constant off-time. An integral temperature-compensated one-shot furnishes a pulse width to the dual 1A totem-pole output drivers. Support functions include undervoltage lockout, soft start, and latched overcurrent protection. The CS-360 comes in a 16-pin DIP or SO wide-body plastic package that costs $2.68. Cherry Semiconductor Corp, East Greenwich, RI. (401) 885-3600.

Fast CPLD guarantees 5-nsec fixed timing.

Based on a programmable switch matrix that provides 100% predictable delays, the MACH111-5, a 32-macrocell device in a 44-pin package, guarantees 5-nsec pin-to-pin delays and operates at maximum frequencies as high as 167 MHz. Six of its 44 pins are dedicated inputs, and 32 are I/Os. A second device, the MACH231-6, is a 128-macrocell device in an 84-pin package that runs at frequencies as high as 166 MHz and provides 6-nsec pin-to-pin delays. Six of the MACH231-6's 84 pins are dedicated inputs, and 64 are I/Os. Both devices offer a programmable low-power mode and are PCI-compliant. The MACH111-5JC costs $17; the MACH231-6JC, $70.68 (1000). Advanced Micro Devices Inc, Sunnyvale, CA. (408) 737-2400.

Control IC charges as many as 10 cells.

A battery charger controller in eight- or 14-pin surface-mount packages uses delta voltage detection for fast charging of as many as 10 NiCd or nickel-metal-hydride cells. To protect the battery, the SC1766 employs a peak-voltage timer and maximum-temperature and -voltage cutoffs and a safety-timer cutoff. You can adjust the timer for an overall maximum charge time of 40, 80, or 160 minutes. To test the charge circuit, you can pull the device's mode pin high. The device's operating voltage ranges from 9 to 18V. Price is $2.39 (1000). Semtech Corp, Newbury Park, CA. (805) 498-2111.

4-Mbit flash device operates at 2.7 to 5V.

Based on a flash-file architecture of 16, 32, or 64 independently lockable blocks, the LH28F004SU 4-Mbit flash memory IC needs 5V for write/erase operations and 2.7 to 3.3V for read operations. You can configure the chip for x8 or x16 operation and 60-, 80-, 120-, and 150-nsec access times. The device also features erase-suspend for read, two-byte write, and full-chip erase. Packaging options for the LH28F004SU include 56-lead TSOP, 48-lead TSOP, and 44-lead SOP in both commercial- and industrial-temperature ranges. The 4-Mbit part costs $14 (1000). Sharp Electronics Corp, Camas, WA. (800) 642-0261.

FPGA furnishes 125,000 usable gates.

Operating at typical frequencies as high as 66 MHz, the XC4000EX family of FPGAs offers devices with as many as 125,000 usable gates. In addition to complying with PCI, the XC4000EX features Select-RAM, which lets you configure each logic block in the FPGA as 32 bits of single-port or 16 bits of dual-port synchronous RAM. Dual-port RAM makes the XC4000EX useful for the high-speed FIFO-buffer designs that single-chip PCI applications require. Efficient routing, redesigned I/O blocks, and a high-speed clock network combine to deliver 4-nsec setup and 6-nsec clock-to-out times. Prices start at $695 for a 28,000-gate device. Xilinx Inc, San Jose, CA. (408) 559-7778.

Half-bridge driver works with lamp ballasts.

The L6569 supplies all the circuits to drive two power MOSFETs in a half-bridge push-pull arrangement for use in electronic lamp ballasts and electronic transformers. The device eliminates the need for an external oscillator and external bootstrap diode. The device comes in two versions. One version drives the lower external MOSFET on before it reaches the undervoltage threshold; the other version drives the MOSFET off before it reaches that threshold. Both types come in mini-DIP and SO-8 packages and cost $0.90 (10,000). SGS-Thomson Microelectronics, Lincoln, MA. (617) 259-0300.