Moteur de recherche de fiches techniques de composants électroniques |
|
74HC258DB Fiches technique(PDF) 2 Page - NXP Semiconductors |
|
74HC258DB Fiches technique(HTML) 2 Page - NXP Semiconductors |
2 / 16 page 1999 Sep 02 2 Philips Semiconductors Product specification Quad 2-input multiplexer; 3-state; inverting 74HC/HCT258 FEATURES • Inverting data path • 3-state outputs interface directly with system bus • Output capability: bus driver • ICC category: MSI. GENERAL DESCRIPTION The 74HC/HCT258 are high-speed Si-gate CMOS devices and are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT258 have four identical 2-input multiplexers 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 (1I0 to 4I0) are selected when input S is LOW and the data inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the outputs (1Yto4Y) in inverted form from the select inputs. The ‘258’ 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: The ‘258’ is identical to the ‘257’ but has inverting outputs. 1Y OE 1I 1 S × 1I 0 S × + () × = 2Y OE 2I 1 S × 2I 0 S × + () × = 3Y OE 3I 1 S × 3I 0 S × + () × = 4Y OE 4I 1 S × 4I 0 S × + () × = QUICK REFERENCE DATA GND = 0 V; Tamb =25 °C; tr =tf = 6 ns. Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; ∑ (CL × VCC2 × fo) = sum of outputs; CL = output load capacitance in pF; VCC = supply voltage in Volts. 2. For HC the condition is VI = GND to VCC; For HCT the condition is VI = GND to VCC − 1.5 V. SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/tPLH propagation delay CL = 15 pF; VCC =5V nI0,nI1 to nY 9 13 ns StonY 1416ns CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per multiplexer notes 1 and 2 55 38 pF |
Numéro de pièce similaire - 74HC258DB |
|
Description similaire - 74HC258DB |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |