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HT7750, HT7961, HT80232

Table of contents:
Info of HT7750
Info of HT7961
Info of HT80232

HT7750, HT7961, HT80232 Selling Leads, Datasheet

MFG:HOLTEK Package Cooled:SOT-89 D/C:08+

HT7750, HT7961, HT80232 Datasheet download

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Part Number: HT7750

MFG: HOLTEK

Package Cooled: SOT-89

D/C: 08+

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HT7750 General Description

The HT77XX series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 1.8V, 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells.

The HT77XX consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving TO92, SOT89, SOT23 and SOT23-5 packages. For SOT23-5 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.

HT80232 General Description

The HT80232 ECON-PCI is a lOMBPS ethernet controller for the PCI bus. Integrating twisted-pair interface and AUI, the ECON-PCI provides an easy way to implement a single chip network adapter for the PCI bus. In addition,the ECON-PCI provides better data transfer performance than traditional NE2000 Ethernet adapters by supporting a better interrupt handling scheme and remote DMA data pre-fetch architecture. Complying with PCI specification 2.1, the ECON-PCI utilizes the auto-loading function to support PCI "plug and play" function and to prevent the adapter card from conflitting with other resources.

Features of the HT80232 are:(1)single chip ethernet controller for pci bus interface;(2)register compatible with ne2000;(3)external 15ns access time sram for data transfer;(4)jumperless configuration with programming interface to eeprom;(5)support boot rom for diskless operation;(6)optional full duplex operation with speed up to 20mbps;(7)early interrupt (cut through) mode allows parallel processing of packet data during reception;(8)software controllable power down feature;(9)single +5v supply, standard cmos technology;(10)100-pin QFP package.The I/O pre-fetch function allows the host to speed up remote DMA,boosting the bus efficiency. By programming the ECON-PCI to run in early interrupt mode, the host can improve the remote DMA performance.The UTP/AUI auto-switching function provides the user with an easy-to-use medium selection.Built-in smart squelch circuit eliminates noise, preventing the receiver from misinterpreting abnormal data signals.

The absolute maximum ratings of the HT80232 can be summarized as:(1)operating temperature:0 to 65°C;(2)storage temperature: -50 to 100°C;(3)supply voltage:-0.5 to 7V;(4)input voltage:Vss-0.5 to Vdd+5V;(5)lead soldering temperature:270°C.These are stress ratings only.Stresses exceeding the range specified under "absolute maximum ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.During data transmission the local DMA uses a programmed pointer and length registers to transfer a packet from local the buffer memory to the local line buffer. During data reception the data is automatically moved to the buffer memory without the intervention of the host,provided the Page Start Register (offset O1H) and the Page Stop Register (02H) were programmed in advance.

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