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74HC258DB Fiches technique(PDF) 2 Page - NXP Semiconductors

No de pièce 74HC258DB
Description  Quad 2-input multiplexer; 3-state; inverting
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC258DB Fiches technique(HTML) 2 Page - NXP Semiconductors

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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


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