Santa Clara, Calif. - Two new low-pin-count, bus-based input/output controllers are available from National Semiconductor Corp. for Intel Pentium 4 systems. National's PC87372 and PC87373 Super I/O controllers integrate all of the required Pentium 4 system control functions in a single chip, rather than having discrete logic scattered about the motherboard.
The integrated chip means a 50 percent cost saving, 15 percent board space saving and simpler board routing, according to the company.
Manufactured with an 0.18-micron CMOS process, the ICs complement Intel's ICH4 I/O controller hub by providing such control functions as master reset generation, power supply good signals, power sequencing and control, interface voltage translation and isolation for the SMBus, plus fan speed monitoring with alarms for slow-running fans.
Legacy functions include an IEEE 1284-compliant parallel port and an 8042-type keyboard and mouse controller. The PC87372 supports a single 16550-type serial port while the PC87373 has two serial ports and integrates standard game and MIDI functions. Both also contain a floppy-disk controller that supports overrun and underrun conditions during direct-memory-access transactions and are free of the NEC765A bug that has plagued some systems containing other Super I/Os.
The PC87372 and PC87373, both in 128-pin quad flat packs, are sampling now. In 1,000-unit quantities, the single-serial-port PC87372 is priced at $2.10, and the dual-serial-port PC87373 is $2.20.
Call (800) 272-9959