Philips 74hc hct573 DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
For a complete data sheet, please also download:
•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT573
Octal D-type transparent latch;
3-state
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT573
the D
FEATURES
• Inputs and outputs on opposite
sides of package allowing easy
interface with microprocessors
• Useful as input or output port for
microprocessors/microcomputers
• 3-state non-inverting outputs for
bus oriented applications
• Common 3-state output enable
input
• Functionally identical to the “563”
and “373”
• Output capability: bus driver
• ICC category: MSI
QUICK REFERENCE DATA
GND = 0 V; T
=25°C; tr=tf= 6 ns
amb
GENERAL DESCRIPTION
The 74HC/HCT573 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/HCT573 are octal D-type
transparent latches featuring
separate D-type inputs for each latch
and 3-state outputs for bus oriented
applications.
A latch enable (LE) input and an
output enable (OE) input are common
to all latches.
The “573” consists of eight D-type
transparent latches with 3-state true
outputs. When LE is HIGH, data at
inputs enter the latches. In this
n
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.
The “573” is functionally identical to
the “563” and “373”, but the “563” has
inverted outputs and the “373” has a
different pin arrangement.
SYMBOL PARAMETER CONDITIONS
TYPICAL
HC HCT
t
PHL/ tPLH
C
I
C
PD
propagation delay CL= 15 pF; VCC=5 V
D
to Q
n
LE to Q
n
n
14 17 ns
15 15 ns
input capacitance 3.5 3.5 pF
power dissipation capacitance per latch notes 1 and 2 26 26 pF
Notes
1. C
is used to determine the dynamic power dissipation (PD in µW):
PD
PD=CPD× V
2
× fi+∑ (CL× V
CC
2
× fo) where:
CC
fi= input frequency in MHz; fo= output frequency in MHz
∑ (CL× V
2
× fo) = sum of outputs
CC
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
“74HC/HCT/HCU/HCMOS Logic Package Information”
See
.
UNIT
December 1990 2
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT573
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
2, 3, 4, 5, 6, 7, 8, 9 D
11 LE latch enable input (active HIGH)
1
10 GND ground (0 V)
19, 18, 17, 16, 15, 14, 13, 12 Q
20 V
to D
0
7
data inputs
OE 3-state output enable input (active LOW)
to Q
0
CC
7
3-state latch outputs
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
December 1990 3
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