744ALS244A-1D [NXP]
Octal buffer 3-State; 八路缓冲器三态型号: | 744ALS244A-1D |
厂家: | NXP |
描述: | Octal buffer 3-State |
文件: | 总9页 (文件大小:113K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
74ALS244A/74ALS244A–1
Octal buffer (3–State)
Product specification
IC05 Data Handbook
1991 Feb 08
Philips
Semiconductors
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
FEATURES
PIN CONFIGURATION
• Octal bus interface
1
20
19
18
17
16
15
14
13
12
11
OEa
Ia0
V
CC
• 3-State buffer outputs sink 24mA and source 15mA
• The -1 version sinks 48mA
2
3
4
5
6
7
8
9
OEb
Ya0
Yb0
Ia1
Ib0
Yb1
Ia2
Ya1
DESCRIPTION
Ib1
The 74ALS244A is an octal buffer that is ideal for driving bus lines or
buffer memory address registers. The outputs are all capable of
sinking 24mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OEa and OEb, each controlling four of the 3-State outputs.
Yb2
Ia3
Ya2
Ib2
Yb3
Ya3
Ib3
GND 10
The 74ALS244A-1 sinks 48 mA I if the V is limited to
OL
CC
5.0V ±0.25V.
SF00227
ORDERING INFORMATION
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
TYPE
ORDER CODE
DRAWING
NUMBER
COMMERCIAL RANGE
DESCRIPTION
74ALS244A
74ALS244A-1
4.5ns
4.5ns
17mA
17mA
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
74ALS244AN,
74ALS244A-1N
20-pin plastic DIP
20-pin plastic SOL
SOT146-1
SOT163-1
SOT339-1
74ALS244AD,
744ALS244A-1D
20-pin plastic
SSOP Type II
74ALS244ADB,
74ALS244A-1DB
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
PINS
DESCRIPTION
HIGH/LOW
20µA/0.1mA
20µA/0.1mA
15mA/24mA
15mA/48mA
Ian, Ibn
OEa, OEb
Yan, Ybn
Yan, Ybn
Data inputs
1.0/1.0
Output Enable inputs (active-Low)
Data outputs
1.0/1.0
750/240
750/480
Data outputs (-1 version)
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
2
4
6
8
17 15 13 11
1
EN1
EN2
19
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
2
4
18
2D
1
16
14
1
OEa
OEb
19
6
12
8
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
2
17
3
5
7
9
15
13
11
18
16 14 12
3
5
7
9
V
= Pin 20
CC
GND = Pin 10
SF00228
SF00229
2
1991 Feb 08
853–1277 01670
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
LOGIC DIAGRAM
FUNCTION TABLE
INPUTS
OEb
OUTPUTS
17
15
3
5
2
4
18
16
Ib0
Ib1
Ib2
Ib3
OEb
Yb0
Yb1
Yb2
Yb3
Ia0
Ia1
Ya0
Ya1
Ya2
Ya3
OEa
L
Ia
L
Ib
L
Ya
Yb
L
L
L
L
H
Z
L
H
X
H
X
H
Z
13
7
9
6
8
14
12
H
H
Ia2
H = High voltage level
11
19
L
X
Z
=
=
=
Low voltage level
Ia3
Don’t care
High impedance “off” state
1
OEa
V
= Pin 20
CC
GND = Pin 10
SF00230
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit 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
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
UNIT
V
V
CC
Supply voltage
Input voltage
Input current
V
V
IN
IN
I
mA
V
V
OUT
Voltage applied to output in High output state
–0.5 to V
CC
All versions
-1 version
48
96
mA
mA
°C
°C
I
Current applied to output in Low output state
OUT
T
Operating free-air temperature range
Storage temperature range
0 to +70
amb
T
–65 to +150
stg
RECOMMENDED OPERATING CONDITIONS
LIMITS
NOM
5.0
SYMBOL
UNIT
PARAMETER
MIN
4.5
MAX
V
I
Supply voltage
5.5
V
CC
V
IH
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
2.0
V
V
IL
IK
0.8
–18
–15
24
V
mA
mA
mA
mA
I
OH
All versions
-1 versions
I
OL
Low-level output current
1
48
Operating free-air temperature range
T
amb
0
+70
°C
NOTES:
1. The 48mA limit applies only under the condition of V = 5.0V ± 5%.
CC
3
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
1
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
2
MIN
– 2
TYP
MAX
I
= –0.4mA
V
V
V
OH
CC
V
V
±10%, V = MAX,
IL
CC
= MIN
IH
I
= –3mA
2.4
3.2
OH
V
OH
High-level output voltage
V
V
= MIN, V = MAX,
IL
= MIN
CC
IH
I
= –15mA
2.0
V
OH
I
I
= 12mA
= 24mA
0.25
0.35
0.40
0.50
V
V
OL
V
V
= MIN, V = MAX,
IL
= MIN
CC
IH
All versions
-1 version
OL
V
Low-level output voltage
Input clamp voltage
OL
V
V
= 4.75V, V = MAX,
IL
= MIN
CC
IH
I
OL
= 48mA
0.35
0.50
V
V
V
CC
V
CC
V
CC
V
CC
= MIN, I = I
IK
–0.73
–1.5
0.1
V
IK
I
I
Input current at maximum input voltage
High-level input current
= MAX, V = 7.0V
mA
µA
mA
I
I
I
IH
= MAX, V = 2.7V
20
I
I
Low-level input current
= MAX, V = 0.4V
–0.1
IL
I
Off-state output current,
High-level voltage applied
I
V
= MAX, V = 2.7V
20
µA
µA
OZH
CC
I
Off-state output current,
Low-level voltage applied
I
V
V
= MAX, V = 0.4V
–20
OZL
CC
I
3
I
O
Output current
= MAX, V = 2.25V
–30
–112
15
mA
mA
mA
mA
CC
O
I
I
6.5
19.5
25
CCH
I
Supply current (total)
V
CC
= MAX
I
24
CC
CCL
30
CCZ
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V = 5V, T = 25°C.
CC
amb
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
.
OS
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
V
= 0°C to +70°C
= +5.0V ± 10%
amb
CC
SYMBOL
PARAMETER
TEST CONDITION
UNIT
C = 50pF, R = 500Ω
L
L
MIN
MAX
t
t
Propagation delay
In to Yn
1.5
1.5
10.0
10.0
PLH
PHL
Waveform 1
ns
ns
ns
t
Output enable time
to High or Low level
Waveform 2
Waveform 3
1.0
2.5
10.0
12.0
PZH
t
PZL
t
Output disable time
from High or Low level
Waveform 2
Waveform 3
2.5
2.5
10.0
12.0
PHZ
t
PLZ
4
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
AC WAVEFORMS
For all waveforms, V = 1.3V.
M
Ian, Ibn
V
M
V
M
t
t
PHL
PLH
Yn
V
V
M
M
SF00231
Waveform 1. Propagation Delay for Non-inverting Outputs
V
V
M
M
t
OEn
Yn
OEn
Yn
V
V
M
M
t
t
t
PLZ
PZH
PHZ
PZL
3.5V
V
–0.3V
OH
V
V
M
M
V
+0.3V
OL
0V
SF00233
SF00234
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
Waveform 3. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
t
w
AMP (V)
0.3V
V
CC
90%
90%
7.0V
NEGATIVE
PULSE
V
V
M
M
10%
10%
V
V
OUT
R
R
IN
L
L
PULSE
GENERATOR
D.U.T.
t
t )
f
t
t )
THL ( f
TLH ( r
R
C
L
T
t
t )
t
t )
TLH ( r
THL ( f
AMP (V)
0.3V
90%
90%
POSITIVE
PULSE
V
V
M
M
Test Circuit for 3-State Outputs
SWITCH POSITION
10%
10%
t
w
TEST
, t
SWITCH
closed
Input Pulse Definition
INPUT PULSE REQUIREMENTS
t
PLZ PZL
All other
open
Family
V
M
Rep.Rate
t
w
t
t
THL
Amplitude
DEFINITIONS:
TLH
R
L
C
L
R
T
=
=
=
Load resistor;
2.0ns
2.0ns
74ALS
3.5V
1.3V
1MHz
500ns
see AC electrical characteristics for value.
Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
Termination resistance should be equal to Z
pulse generators.
of
OUT
SC00072
5
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3–State)
74ALS244A/74ALS244–1
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
6
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3–State)
74ALS244A/74ALS244–1
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
7
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3–State)
74ALS244A/74ALS244–1
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
8
1991 Feb 08
Philips Semiconductors
Product specification
Octal buffer (3–State)
74ALS244A/74ALS244–1
DEFINITIONS
Data Sheet Identification
Product Status
Definition
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
orsystemswheremalfunctionofaPhilipsSemiconductorsandPhilipsElectronicsNorthAmericaCorporationProductcanreasonablybeexpected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Philips
Semiconductors
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