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74HCT154 Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74HCT154
Szczegółowy opis  4-to-16 line decoder/demultiplexer
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT154 Arkusz danych(HTML) 2 Page - NXP Semiconductors

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September 1993
2
Philips Semiconductors
Product specification
4-to-16 line decoder/demultiplexer
74HC/HCT154
FEATURES
• 16-line demultiplexing capability
• Decodes 4 binary-coded inputs into one of 16 mutually
exclusive outputs
• 2-input enable gate for strobing or expansion
• Output capability: standard
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT154 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/HCT154 decoders accept four active HIGH
binary address inputs and provide 16 mutually exclusive
active LOW outputs.
The 2-input enable gate can be used to strobe the decoder
to eliminate the normal decoding “glitches” on the outputs,
or it can be used for the expansion of the decoder.
The enable gate has two AND’ed inputs which must be
LOW to enable the outputs.
The “154” can be used as a 1-to-16 demultiplexer by using
one of the enable inputs as the multiplexed data input.
When the other enable is LOW, the addressed output will
follow the state of the applied data.
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 V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay An, En to Yn
CL = 15 pF; VCC =5 V
11
13
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per package
notes 1 and 2
60
60
pF


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