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74VHCT138AMTR датащи(PDF) 1 Page - STMicroelectronics

номер детали 74VHCT138AMTR
подробное описание детали  3 TO 8 LINE DECODER (INVERTING)
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHCT138AMTR датащи(HTML) 1 Page - STMicroelectronics

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December 2004
s
HIGH SPEED: tPD = 7.6 ns (TYP.) at VCC = 5V
s
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA=25°C
s
COMPATIBLE WITH TTL OUTPUTS:
VIH = 2V (MIN.), VIL = 0.8V (MAX)
s
POWER DOWN PROTECTION ON INPUTS
& OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
OPERATING VOLTAGE RANGE:
VCC(OPR) = 4.5V to 5.5V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 138
s
IMPROVED LATCH-UP IMMUNITY
s
LOW NOISE: VOLP = 0.8V (MAX.)
DESCRIPTION
The 74VHCT138A is an advanced high-speed
CMOS 3 TO 8 LINE DECODER (INVERTING)
fabricated
with
sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
If the device is enabled, 3 binary select inputs (A,
B, and C) determine which one of the outputs will
go low. When enable input G1 is held low or either
G2A or G2B is held high, the decoding function is
inhibited and all the 8 outputs go to high.
The three enable inputs are provided to ease
cascade connection and application of address
decoders for memory systems.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V since all
inputs are equipped with TTL threshold.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74VHCT138A
3 TO 8 LINE DECODER (INVERTING)
Figure 1: Pin Connection And IEC Logic Symbols
Table 1: Order Codes
PACKAGE
T & R
SOP
74VHCT138AMTR
TSSOP
74VHCT138ATTR
TSSOP
SOP
Rev. 3


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