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74ALS258 Arkusz danych(PDF) 2 Page - NXP Semiconductors |
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74ALS258 Arkusz danych(HTML) 2 Page - NXP Semiconductors |
2 / 11 page Philips Semiconductors Product specification 74ALS257/74ALS258 Data selector/multiplexer 74ALS257 Quad 2-input data selector, non-inverting (3-State) 74ALS258 Quad 2-input data selector, inverting (3-State) 2 1991 Feb 08 853–1130 01670 DESCRIPTION The 74ALS257 is a quad 2-input multiplexer which selects 4 bits of data from one of two sources under the control of a common select input (S). The output enable input (OE) is active when Low. When OE is High, all of the outputs (Yn) are forced to a High impedance state (3-State) regardless of all other input conditions. Moving data from two registers to a common output bus is a typical use of the 74ALS257. The state of the select input determines the particular register from which data comes. The device is the logic implementation of 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the select input. The 74ALS258 is similar but has inverting outputs (Yn). TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74ALS257 7.0ns 7mA 74ALS258 7.0ns 7mA ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 16-pin plastic DIP 74ALS257N, 74ALS258 SOT38-4 16-pin plastic SO 74ALS257D, 74ALS258D SOT109-1 16-pin plastic SSOP Type II 74ALS257DB, 74ALS258DB SOT338-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW Ina, Inb, Inc, Ind Data inputs 1.0/1.0 20 µA/0.1mA S Select input 1.0/1.0 20 µA/0.1mA OE Enable input 1.0/1.0 20 µA/0.1mA Ya – Yd, Ya – Yd Data outputs 20/240 0.4mA/24mA NOTE: One (1.0) ALS unit load is defined as: 20 µA in the High state and 0.1mA in the Low state. PIN CONFIGURATION – 74ALS257 16 15 14 13 12 11 10 7 6 5 4 3 2 1 Yb VCC Yd I0c I1c I1d OE I0d S I0a I1b I1a Ya I0b 9 8 GND Yc SF00673 PIN CONFIGURATION – 74ALS258 16 15 14 13 12 11 10 7 6 5 4 3 2 1 Yb VCC Yd I0c I1c I1d OE I0d S I0a I1b I1a Ya I0b 9 8 GND Yc SC00079 |
Podobny numer części - 74ALS258 |
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Podobny opis - 74ALS258 |
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