Philips Semiconductors 8-input Multiplexer (3-State) 74F251A Owner's Manual

查询N74F251AD供应商 Philips Semiconductors Product specification

74F251A8-input multiplexer (3-State)

FEATURES PIN CONFIGURATION High speed 8-to-1 multiplexing

On chip decoding I3 VCC

Multifunction capability

Inverting and Non-Inverting outputs

Both outputs are 3-State for further multiplexer expansion

DESCRIPTION

OE S1

The 74F251A is a logic implementation of a single 8-position switch with the switch position controlled by the state of three Select (S0, 98GND S2 S1, S2) inputs. True (Y) and complementary (Y) outputs are both

provided. The output enable (OE) is active Low. When OE is High, SF00778

both outputs are in High impedance state, allowing multiple output connections to a common bus without driving nor loading the bus

TYPICAL TYPICAL

significantly. All but one device must be in High impedance state to

TYPE PROPAGATION SUPPLY CURRENT

avoid high currents that would exceed the maximum ratings when

DELAY (TOTAL)

the outputs of the 3-State devices are tied together. When the output

of more than one device is tied together the user must ensure that 74F251A 4.5ns 19m A

there is no overlap in the active Low portion of the output enable voltages.

ORDERING INFORMATION

ORDER CODE

PKGCOMMERCIAL RANGE

DESCRIPTION

DWG #

VCC = 5V ±10%, Tamb = 0°C to +70°C

16-pin plastic DIP N74F251AN SOT38-4 16-pin plastic SO N74F251AD SOT162-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW

I0–I7 Data inputs 1.0/1.0 20µA/0.6m A S0–S2 Select inputs 1.0/1.0 20µA/0.6m A OE Output Enable input (active Low) 1.0/1.0 20µA/0.6m A Y, Y Data outputs 150/40 3m A/24m A

NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6m A in the Low state.

LOGIC SYMBOL IEC/IEEE SYMBOL

MUX7 EN

VCC = Pin 16 GND = Pin 8

SF00779 SF00780

11996 Jan 05 853–0358 16191