74F455 Datasheet | Philips Semiconductors

FEATURES 74F455,- 74F456 - High impedance NPN base inputs for reduced loading (40µA in High and Low states) DESCRIPTION The 74F455 and 74F456 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. TYPICAL PROPAGATION DELAY 6.5ns 7.5ns - 74F456 bines 74F244 and 74F280A functions in one package - 74F456 is a center pin version of the 74F656A - 74F456 Non-Inverting - 3-State outputs sink 64m A and source 15m A - 24-pin plastic Slim DIP (300 mil) package - Broadside pinout simplifies PC board layout TYPE 74F455 74F456 TYPICAL SUPPLY CURRENT (TOTAL) 64m A 64m A ORDERING INFORMATION DESCRIPTION MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74456N N74456D PKG DWG # 24-pin plastic Slim DIP (300mil) 24-pin plastic SOL SOT222-1 SOT137-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS D0- D7 PI OE0, OE1 ΣE, ΣO Q0- Q7 Data inputs Parity input Output Enable inputs (active Low) Parity outputs Data outputs (75F455) DESCRIPTION 74F(U.L.) HIGH/LOW 2.0/0.066 1.0/0.033 1.0/0.033 750/106.7 750/106.7 LOAD VALUE HIGH/LOW 40µA/40µA 20µA/20µA 20µA/20µA 15m A/64m A 15m A/64m A 15m A/64m A Q0- Q7 Data outputs (75F456) 750/106.7 NOTE: One (1.0) FAST Unit Load (U.L.) is defined as 20µA in the High state and 0.6m A in the Low state. PIN CONFIGURATION - 74F455 OE0 OE1 PI D0 D1 D2 VCC D3 D4 D5 D6 D7 1 2 3 4 5 6 7 8 9 10 11 12 24 ΣO 23 ΣE 22 Q0 21 Q1 20 Q2 19 GND 18 GND 17 Q3 16 Q4 15 Q5 14 Q6 13 Q7 PIN CONFIGURATION - 74F456 OE0 OE1 PI D0 D1 D2 VCC D3 D4 D5 D6 D7 1 2 3 4 5 6 7 8 9 10 11 12 24 ΣO 23 ΣE 22 Q0 21 Q1 20 Q2 19 GND 18 GND 17 Q3 16 Q4 15 Q5 14 Q6 13 Q7 SF00969 SF00958 - Discontinued part. Please see the Discontinued Products List. 1999 Jan 08 853- 0371 20616 Philips Semiconductors Product specification Buffers/Drivers 74F455,- 74F456 LOGIC SYMBOL -...