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Texas Instruments Inte kategoriserad SN74AS573AN

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

SDAS048D − DECEMBER 1989 − REVISED JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
•3-State Buer-Type Outputs Drive Bus
Lines Directly
•Bus-Structured Pinout
•True Logic Outputs
•Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), Standard Plastic (N) and
Ceramic (J) 300-mil DIPs, and Ceramic Flat
(W) Packages
description
These octal D-type transparent latches feature
3-state outputs designed specically for driving
highly capacitive or relatively low-impedance
loads. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
While the latch-enable (LE) input is high, outputs
(Q) respond to the data (D) inputs. When LE is low,
the outputs are latched to retain the data that was
set up.
A buffered output-enable (OE) input can be used
to place the eight outputs in either a normal logic
state (high or low) or a high-impedance state. In
the high-impedance state, the outputs neither load
nor drive the bus lines signicantly. The
high-impedance state and the increased drive
provide the capability to drive bus lines without
interface or pullup components.
OE does not aect internal operation of the
latches. Old data can be retained or new data can
be entered while the outputs are in the
high-impedance state.
The SN54ALS573C and SN54AS573A are characterized for operation over the full military temperature range
of −55° ° ° °C to 125 C. The SN74ALS573C and SN74AS573A are characterized for operation from 0 C to 70 C.
FUNCTION TABLE
(each latch)
INPUTS
OUTPUT
OE LE D
OUTPUT
Q
L H H H
L H L L
L L X Q0
H X X Z
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1D
2D
3D
4D
5D
6D
7D
8D
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
LE
SN54ALS573C, SN54AS573A . . . J OR W PACKAGE
SN74ALS573C, SN74AS573A . . . DW OR N PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
SN54ALS573C, SN54AS573A . . . FK PACKAGE
(TOP VIEW)
2D
1D
OE
8Q
7Q 1Q
8D
G
ND
LE
V
CC
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
SDAS048D − DECEMBER 1989 − REVISED JANUARY 1995
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
logic symbol†logic diagram (positive logic)
OE
1D
2
1D 3
2D 4
3D
5
4D 6
5D
C1
11
LE
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
7
6D
8
7D 9
8D
EN
1
OE
LE
1D
1Q
1
11
2
19
To Seven Other Channels
C1
1D
†This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN54ALS573C −55° °C to 125 C. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS573C 0° °C to 70 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range −65° °C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54ALS573C SN74ALS573C
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.7 0.8 V
IOH High-level output current −1 −2.6 mA
IOL Low-level output current 12 24 mA
twPulse duration, LE high 25 10 ns
tsu Setup time, data before LE↓10 10 ns
thHold time, data after LE↓7 7 ns
TAOperating free-air temperature −55 125 0 70 C°



SDAS048D − DECEMBER 1989 − REVISED JANUARY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS573C SN74ALS573C
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.2 −1.2 V
VCC = 4.5 V to 5.5 V, IOH = −0.4 mA VCC −2 VCC − 2
V
OH
V 4 5 V
IOH = −1 mA 2.4 3.3 V
VOH
VCC = 4.5 V IOH = −2.6 mA 2.4 3.2
V
V
V 4 5 V
IOL = 12 mA 0.25 0.4 0.25 0.4
V
VOL VCC = 4.5 V IOL = 24 mA 0.35 0.5 V
IOZH VCC = 5.5 V, V
O = 2.7 V 20 20 Aµ
IOZL VCC = 5.5 V, V
O = 0.4 V −20 −20 µA
IIVCC = 5.5 V, V
I = 7 V 0.1 0.1 mA
IIH VCC = 5.5 V, V
I = 2.7 V 20 20 Aµ
IIL VCC = 5.5 V, V
I = 0.4 V −0.13 −0.1 mA
IO‡VCC = 5.5 V, V
O = 2.25 V −20 −112 −30 −112 mA
Outputs high 10 17 10 17
I
CC
V
CC
= 5.5 V Outputs low 15 24 15 24 mA
CC
CC
Outputs disabled 16 27 16 27
†All typical values are at V
CC = 5 V, T
A = 25°C.
‡The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX§UNIT
SN54ALS573C SN74ALS573C
MIN MAX MIN MAX
tPLH
D
Q
2 20 2 14
ns
tPHL
D Q 2 17 2 14 ns
tPLH
LE
Q
8 33 6 20
tPHL LE Q 8 24 6 19 ns
tPZH
OE
Q
4 28 3 18
ns
tPZL OE Q 4 21 4 18 ns
tPHZ
OE
Q
2 20 1 10
ns
tPLZ
OE
Q
3 26 1 15
ns
§For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

Produktspecifikationer

Varumärke: Texas Instruments
Kategori: Inte kategoriserad
Modell: SN74AS573AN

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