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I74F656AD
Octal buffer/driver with parity; non-inverting; 3-state
Product specification
IC15 Data Handbook
1991 Jul 17
Philips Semiconductors Product specification74F655A*
74F656ABuffers/drivers74F655A Octal buffer/driver with parity, inverting (3-State)
74F656A Octal buffer/driver with parity, non-inverting (3-State)
FEATURES Significantly improved AC performance over 74F655 and 74F656 High impedance NPN base input for reduced loading
(40μA in High and Low states) Ideal in applications where high output drive and light bus loading
are required (IIL is 40μA vs. FAST std of 600μA) 74F655A combines 74F240 and 74F280A functions in one
package 74F656A combines 74F244 and 74F280A functions in one
package 74F655A Inverting 74F656A Non-inverting 3-State outputs sink 64mA and source 15mA 24-pin plastic Slim DIP (300mil) package Inputs on one side and outputs on the other side simplifies PC
board layout Combined functions reduce part count and enhance system
performance Industrial temperature range available (–40°C to +85°C)
DESCRIPTIONThe 74F655A and 74F656A are octal buffers and line drivers with
parity generation/checking designed to be employed as memory
address drivers, clock drivers and bus-oriented
transmitters/receivers. These parts include parity generator/checker
to improve PC board density.
ORDERING INFORMATION
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE: One (1.0) FAST Unit Load (U.L.) is defined as: 20μA in the High state and 0.6mA in the Low state.
Philips Semiconductors Product specification
74F655A*
74F656ABuffers/drivers
PIN CONFIGURATION – 74F655A
PIN CONFIGURATION – 74F656A
LOGIC SYMBOL – 74F655A
LOGIC SYMBOL – 74F656A
IEEE/IEC SYMBOL – 74F655A
LOGIC SYMBOL (IEEE/IEC) – 74F656A
Philips Semiconductors Product specification
74F655A*
74F656ABuffers/drivers
LOGIC DIAGRAM – 74F655A
Philips Semiconductors Product specification
74F655A*
74F656ABuffers/drivers
LOGIC DIAGRAM – 74F656A
Philips Semiconductors Product specification
74F655A*
74F656ABuffers/drivers
FUNCTION TABLE= High voltage level= Low voltage level= Don’t care= High impedance “off” state
FUNCTION TABLE for PARITY OUTPUTS= High voltage level= Low voltage level= High impedance “off” state
ABSOLUTE MAXIMUM RATINGS(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
RECOMMENDED OPERATING CONDITIONS
