74F776 Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS 74F776 Pi-bus transceiver Product specification IC15 Data Handbook 1990 Dec 19 Philips Semiconductors Philips Semiconductors Product specification Pi- bus transceiver Features - Octal latched transceiver - Drives heavily loaded backplanes with equivalent load impedances down to 10 ohms - High drive (100m A) open collector drivers on B port - Reduced voltage swing (1 volt) produces less noise and reduces power consumption - High speed operation enhances performance of backplane buses and facilitates incident wave switching - patible with Pi- bus and IEEE 896 Futurebus standards - Built- in precision band- gap reference provides accurate receiver thresholds and improved noise immunity - Controlled output ramp and multiple GND pins minimize ground bounce - Glitch- free power up/power down operation - Multiple package options - Industrial temperature range available (- 40°C to +85°C) consumption and a series diode on the drivers to reduce capacitive loading. Incident wave switching is employed, therefore BTL propagation delays are short. Although the voltage swing is less for BTL, so is its receiver threshold, therefore noise margins are excellent. BTL offers low power consumption, low ground bounce, EMI and crosstalk, low capacitive loading, superior noise margin and low propagation delays. This results in a high bandwidth, reliable backplane. The 74F776 A port has TTL 3- state drivers and TTL receivers with a latch function. A separate high- level control voltage input (VX) is provided to limit the A side output level to a given voltage level (such as 3.3V). For 5.0V systems, VX is simply tied to VCC. The 74F776 has a designed feature to control the B output transitions during power sequencing. There are two possible sequencing, They are as follows: 1.When LE = low and OEBn = low then the B outputs are disabled until the LE circuitry takes control. Then the B outputs will follow the A inputs, making a maximum of one transition during...