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74AHC138PW Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74AHC138PW
Szczegółowy opis  3-to-8 line decoder/demultiplexer; inverting
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74AHC138PW Arkusz danych(HTML) 2 Page - NXP Semiconductors

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1999 Sep 27
2
Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer; inverting
74AHC138;
74AHCT138
FEATURES
• ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
• Balanced propagation delays
• All inputs have Schmitt-trigger
actions
• Multiple input enable for easy
expansion
• Ideal for memory chip select
decoding
• Inputs accept voltages higher than
VCC
• For AHC only:
operates with CMOS input levels
• For AHCT only:
operates with TTL input levels
• Specified from
−40 to +85 and +125 °C.
DESCRIPTION
The 74AHC/AHCT138 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 74AHC/AHCT138 decoders accept three binary weighted address inputs
(A0,A1 and A2) and when enabled, provide 8 mutually exclusive active LOW
outputs (Y0 to Y7).
The ‘138’ features three enable inputs: two active LOW (E1 and E2) and one
active HIGH (E3). Every output will be HIGH unless E1 and E2 are LOW and E3
is HIGH.
This multiple enable function allows easy parallel expansion of the ‘138’ to a
1-of-32 (5 to 32 lines) decoder with just four ‘138’ ICs and one inverter.
The ‘138’ can be used as an eight output demultiplexer by using one of the
active LOW enable inputs as the data input and the remaining enable inputs as
strobes. Unused enable inputs must be permanently tied to their appropriate
active HIGH or LOW state.
The ‘138’ is identical to the ‘238’ but has inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf ≤ 3.0 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. The condition is VI = GND to VCC.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC
AHCT
tPHL/tPLH
propagation delay An to Yn
CL = 15 pF; VCC = 5 V
4.4
4.4
ns
propagation delay E3 to Yn; En to Yn
CL = 15 pF; VCC = 5 V
4.2
4.3
ns
CI
input capacitance
VI =VCC or GND
3.0
3.0
pF
CO
output capacitance
4.0
4.0
pF
CPD
power dissipation capacitance
CL = 50 pF; f = 1 MHz;
notes 1 and 2
18
23
pF


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