74LV257N

The 74LV257N belongs to 74LV257 family which is a low-voltage Si-gate CMOS device and is pin and function compatible with 74HC/HCT257 and it is a quad 2-input multiplexer with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S). The data inputs from source 0 (1l0 to 4l0) are selected when input(S) is LOW and the data inputs from source 1 (1l1 to 4l1) are selected when S in HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) from the selected inputs. The 74LV257N is the logic implementation of a 4-pole, 2-position switch, where the position of the switch is determined by the logic levels applied to S. The outputs are forced to a high impedance OFF-state when OE is HIGH. The logic equations for the outputs are: 1Y = OE * (1I1 * S + 1I0 * S), 2Y = OE * (2I1 * S + 2I0 * S), 3Y = OE * (3I1 * S + 3I0 * S), 4Y = OE * (4I1 * S + 4I0 * S)

The features of 74LV257N can be summarized as (1)optimized for low voltage applications: 1.0 to 3.6 V; (2)accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V; (3)typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V, Tamb = 25°C typical VOHV (output VOH undershoot) > 2 V at VCC = 3.3 V, Tamb = 25°C; (4)non-inverting data path; (5)output capability: bus driver; (6)ICC category: MSI.

The absolute maximum ratings of 74LV257N are (1)VCC DC supply voltage: -0.5 to +4.6V; (2)±IIK DC input diode current(VI < -0.5 or VI > VCC + 0.5V): 20 mA; (3)±IOK DC output diode current(VO < -0.5 or VO > VCC + 0.5V): 50 mA; (4)±IO DC output source or sink current- standard outputs(-0.5V < VO < VCC + 0.5V): 35mA; (5)±IGND, ±ICC DC VCC or GND current for types with-standard outputs: 70mA; (6)Tstg storage temperature range of the 74LV257N: -65 to +150 °C; (7)Ptot power dissipation per package for temperature range: -40 to +125°C,plastic DIL above +70°C derate linearly with 12mW/K/plastic mini-pack (SO) above +70°C derate linearly with 8 mW/K/plastic shrink mini-pack (SSOP and TSSOP)above +60°C derate linearly with 5.5 mW/K: 750/500/400mW.(1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the 74LV257N at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.).