74F777

Features:

• Latching transceiver
• High drive Open Collector output current with minimum output swing
• Compatible with Test Mode (TM) bus specification
• Controlled output ramp
• Multiple package options
• Industrial temperature range available (40 to +85)


Pinout




Specifications

SYMBOL	PARAMETER		RATING	UNIT
VCC	Supply voltage		0.5 to +7.0	V
VX	Threshold control		0.5 to +7.0	V
VIN	Input voltage	OEB n, OEAn, LE  n	0.5 to +7.0	V
		A0 A2, B0 B2	0.5 to +5.5	V
IIN	Input current		30 to +5	mA
VOUT	Voltage applied to output in High output state		0.5 to VCC	V
IOUT	Current applied to output in Low output state	A0 A2	48	mA
		B0 B2	200	mA
Tamb	Operating free air temperature range	Commercial range	0 to +70
		Industrial range	40 to +85
Tstg	Storage temperature range		65 to +150

Description

The 74F777 is a triple bidirectional latched bus transceiver and is intended to provide the electrical interface to a high performance wiredOR bus. This bus has a loaded characteristics impedancerange of 20 to 50 ohms and is terminated on each end with a 30 to 40 ohm resistor.

The 74F777 is a triple bidirectional transceiver with Open Collector B and 3State A port output drivers. A latch function is provided for the A port signals. The B port output driver is designed to sink 100mA  from 2 volts to minimize crosstalk and ringing on the bus.

A separate output threshold clamp voltage (VX) of the 74F777 is provided to prevent the A port output High level from exceeding future high density processor supply voltage levels. For 5 volt systems, VX is simply tied to VCC.