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74HCT563 bảng dữ liệu(PDF) 2 Page - NXP Semiconductors

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December 1990
2
Philips Semiconductors
Product specification
Octal D-type transparent latch; 3-state;
inverting
74HC/HCT563
FEATURES
• 3-state inverting outputs for bus
oriented applications
• Inputs and outputs on opposite
sides of package allowing easy
interface with microprocessor
• Common 3-state output enable
input
• Output capability: bus driver
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT563 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/HCT563 are octal D-type
transparent latches featuring
separate D-type inputs for each latch
and inverting 3-state outputs for bus
oriented applications.
A latch enable (LE) input and an
output enable (OE) input are common
to all latches.
The “563” is functionally identical to
the “573”, but has inverted outputs.
The “563” consists of eight D-type
transparent latches with 3-state
inverting outputs. The LE and OE are
common to all latches.
When LE is HIGH, data at the Dn
inputs enter the latches. In this
condition the latches are transparent,
i.e. a latch output will change state
each time its corresponding D-input
changes.
When LE is LOW the latches store the
information that was present at the
D-inputs a set-up time preceding the
HIGH-to-LOW transition of LE.
When OE is LOW, the contents of the
8 latches are available at the outputs.
When OE is HIGH, the outputs go to
the high impedance OFF-state.
Operation of the OE input does not
affect the state of the latches.
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 Dn, LE to Qn
CL = 15 pF; VCC =5 V
14
16
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per latch
notes 1 and 2
19
19
pF


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