Philips Semiconductors
Product specification
Latch/flip-flop
74F573 Octal Transparent Latch (3-State)
74F574 Octal D Flip-Flop (3-State)
FEATURES
74F573/74F574
•
74F573 is broadside pinout version of 74F373
•
74F574 is broadside pinout version of 74F374
•
Inputs and Outputs on opposite side of package allow easy
interface to Microprocessors
The 74F574 is functionally identical to the 74F374 but has a
broadside pinout configuration to facilitate PC board layout and
allow easy interface with microprocesors.
It is an 8-bit, edge triggered register coupled to eight 3-State output
buffers. The two sections of the device are controlled independently
by the clock (CP) and Output Enable (OE) control gates.
The register is fully edge-triggered. The state of each D input, one
setup time before the Low-to-High clock transition is transferred to
the corresponding flip-flop’s Q output.
The 3-State output buffers are designed to drive heavily loaded
3-State buses, MOS memories, or MOS microprocessors. The
active Low Output Enable (OE) controls all eight 3-State buffers
independently of the latch operation. When OE is Low, the latched
or transparent data appears at the outputs. When OE is High, the
outputs are in high impedance “off” state, which means they will
neither drive nor load the bus.
TYPICAL SUPPLY
CURRENT
(TOTAL)
35mA
TYPICAL SUPPLY
CURRENT
(TOTAL)
50mA
•
Useful as an Input or Output port for Microprocessors
•
3-State Outputs for Bus interfacing
•
Common Output Enable
•
74F563 and 74F564 are inverting version of 74F573 and 74F574
respectively
•
3-State Outputs glitch free during power-up and power-down
•
These are High-Speed replacements for N8TS805 and N8TS806
DESCRIPTION
The 74F573 is an octal transparent latch coupled to eight 3-State
output buffers. The two sections of the device are controlled
independently by Enable (E) and Output Enable (OE) control gates.
The 74F573 is functionally identical to the 74F373 but has a
broadside pinout configuration to facilitate PC board layout and
allow easy interface with microprocessors.
The data on the D inputs is transferred to the latch outputs when the
Enable (E) input is High. The latch remains transparent to the data
input while E is High and stores the data that is present one setup
time before the High-to-Low enable transition.
The 3-State output buffers are designed to drive heavily loaded
3-State buses, MOS memories, or MOS microprocessors. The
active Low Output Enable (OE) controls all eight 3-State buffers
independent to the latch operation. When OE is Low, the latched or
transparent data appears at the outputs. When OE is High, the
outputs are in high impedance “off” state, which means they will
neither drive nor load the bus.
TYPE
74F573
TYPICAL
PROPAGATION DELAY
5.0ns
TYPE
74F574
TYPICAL f
MAX
180MHz
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic DIP
20-Pin Plastic SOL
20-Pin Plastic SSOP
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F573N, N74F574N
N74F573D, N74F574D
N74F573DB
PKG DWG #
SOT146-1
SOT163-1
SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
D0 - D7
E (74F573)
OE
CP (74F574)
Data inputs
Latch Enable input (active falling edge)
Output Enable input (active Low)
Clock Pulse input (active rising edge)
DESCRIPTION
74F (U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
150/40
LOAD VALUE
HIGH/LOW
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
3.0mA/24mA
Q0 - Q7
3-State outputs
NOTE:
One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
1989 Oct 16
2
853-0083 97897
Philips Semiconductors
Product specification
Latch/flip-flop
74F573/74F574
FUNCTION TABLE – 74F574
INPUTS
OE
L
L
L
H =
h =
L =
l =
NC=
X =
Z =
↑
=
↑
=
CP
↑
↑
↑
Dn
l
h
X
INTERNAL
REGISTER
L
H
NC
OUTPUTS
Q0 – Q7
L
H
NC
Z
OPERATING MODES
Load and read register
Hold
Disable outputs
H
↑
Dn
Dn
High voltage level
High voltage level one setup time prior to the Low-to-High clock transition
Low voltage level
Low voltage level one setup time prior to the Low-to-High clock transition
No change
Don’t care
High impedance “off” state
Low-to-High clock transition
Not a Low-to-High clock transition
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5.0
–0.5 to +V
CC
48
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
OH
I
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature range
0
PARAMETER
LIMITS
MIN
4.5
2.0
0.8
–18
–3
24
70
NOM
5.0
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
1989 Oct 16
5
模拟电子
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