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N74ALS244AD
Datasheet (Philips)
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Datasheet N74ALS244A-1D, N74ALS244A-1DB, N74ALS244A-1N, N74ALS244AD, N74ALS244AN Datasheet (Philips)

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Page 1
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74ALS244A/74ALS244A–1
Octal buffer (3–State)
Product specification IC05 Data Handbook
1991 Feb 08
INTEGRATED CIRCUITS
Page 2
74ALS244A/74ALS244A-1Octal buffer (3-State)
2
1991 Feb 08 853–1277 01670
FEA TURES
•Octal bus interface
•3-State buffer outputs sink 24mA and source 15mA
•The -1 version sinks 48mA
DESCRIPTION
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, OE
a and OEb, each controlling four of the 3-State outputs.
The 74ALS244A-1 sinks 48 mA IOL if the VCC is limited to
5.0V ±0.25V.
TYPE
TYPICAL
PROPAGATION
DELA Y
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS244A 4.5ns 17mA
74ALS244A-1 4.5ns 17mA
PIN CONFIGURATION
1 2 3 4 5 6 7 8 9
10 11
12
13
14
15
16
17
18
19
20
V
CC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb Ya0 Ib0 Ya1 Ib1 Ya2 Ib2 Ya3 Ib3
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
DRAWING
NUMBER
20-pin plastic DIP
74ALS244AN,
74ALS244A-1N
SOT146-1
20-pin plastic SOL
74ALS244AD,
744ALS244A-1D
SOT163-1
20-pin plastic
SSOP Type II
74ALS244ADB,
74ALS244A-1DB
SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn Data inputs 1.0/1.0 20µA/0.1mA
OEa, OEb Output Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA
Yan, Ybn Data outputs 750/240 15mA/24mA Yan, Ybn Data outputs (-1 version) 750/480 15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
OEa
1
SF00228
2 4 6 8 17 15 13 11
18 16 14 12 3 5 7 9
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
V
CC
= Pin 20
GND = Pin 10
OEb19
IEC/IEEE SYMBOL
1
2D
EN1 EN2
1
2
19
2 4 6 8
17 15 13
11
18 16
14 12 3 5 7 9
SF00229
Page 3
74ALS244A/74ALS244A-1Octal buffer (3-State)
1991 Feb 08
3
LOGIC DIAGRAM
V
CC
= Pin 20
Ia0
SF00230
OEa
Ia3
Ia2
Ia1
2
4
6
8
1
Ya0
Ya1
Ya2
Ya3
18
16
14
12
Ib0
Ib1
Ib2
Ib3
OE
b
17
15
13
11
19
3
5
7
9
Yb0
Yb1
Yb2
Yb3
GND = Pin 10
FUNCTION TABLE
INPUTS OUTPUTS
OEa Ia OEb Ib Ya Yb
L L L L L L L H L H H H H X H X Z Z
H = High voltage level L = Low voltage level X = Don’t care Z = High impedance “off” state
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 UNIT
V
CC
Supply voltage –0.5 to +7.0 V
V
IN
Input voltage –0.5 to +7.0 V
I
IN
Input current –30 to +5 mA
V
OUT
Voltage applied to output in High output state –0.5 to V
CC
V
pp
p
p
All versions 48 mA
I
OUT
Current applied to output in Low output state
-1 version 96 mA
T
amb
Operating free-air temperature range 0 to +70 °C
T
stg
Storage temperature range –65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5.0 5.5 V
V
IH
High-level input voltage 2.0 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
I
OH
High-level output current –15 mA
p
All versions 24 mA
IOLLow-level output current
-1 versions 48
1
mA
T
amb
Operating free-air temperature range
0 +70 °C
NOTES:
1. The 48mA limit applies only under the condition of V
CC
= 5.0V ± 5%.
Page 4
74ALS244A/74ALS244A-1Octal buffer (3-State)
1991 Feb 08
4
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN TYP
2
MAX
UNIT
VCC±10%, VIL = MAX,
IOH = –0.4mA V
CC
– 2 V
-
p
CC
,
IL
,
VIH = MIN
IOH = –3mA 2.4 3.2 V
VOHHigh level out ut voltage
VCC = MIN, VIL = MAX, V
IH
= MIN
IOH = –15mA 2.0 V
VCC = MIN, VIL = MAX,
I
OL
= 12mA 0.25 0.40 V
-
p
All versions
CC
,
IL
,
VIH = MIN
I
OL
= 24mA 0.35 0.50 V
VOLLow level out ut voltage
-1 version
VCC = 4.75V , VIL = MAX, V
IH
= MIN
I
OL
= 48mA 0.35 0.50 V
V
IK
Input clamp voltage VCC = MIN, II = I
IK
–0.73 –1.5 V
I
I
Input current at maximum input voltage VCC = MAX, VI = 7.0V 0.1 mA
I
IH
High-level input current VCC = MAX, VI = 2.7V 20 µA
I
IL
Low-level input current VCC = MAX, VI = 0.4V –0.1 mA
I
OZH
Off-state output current, High-level voltage applied
VCC = MAX, VI = 2.7V 20 µA
I
OZL
Off-state output current, Low-level voltage applied
VCC = MAX, VI = 0.4V –20 µA
I
O
Output current
3
VCC = MAX, VO = 2.25V –30 –112 mA
I
CCH
6.5 15 mA
I
CC
Supply current (total)
I
CCL
VCC = MAX
19.5 24 mA
I
CCZ
25 30 mA
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
CC
= 5V, T
amb
= 25°C.
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
SYMBOL PARAMETER TEST CONDITION
T
amb
= 0°C to +70°C
V
CC
= +5.0V ± 10%
C
L
= 50pF, RL = 500Ω
UNIT
MIN MAX
t
PLH
t
PHL
Propagation delay In to Yn
Waveform 1
1.5
1.5
10.0
10.0
ns
t
PZH
t
PZL
Output enable time to High or Low level
Waveform 2 Waveform 3
1.0
2.5
10.0
12.0
ns
t
PHZ
t
PLZ
Output disable time from High or Low level
Waveform 2 Waveform 3
2.5
2.5
10.0
12.0
ns
Page 5
74ALS244A/74ALS244A-1Octal buffer (3-State)
1991 Feb 08
5
AC WAVEFORMS
For all waveforms, VM = 1.3V .
V
M
V
M
V
M
V
M
Yn
Ian, Ibn
t
PLH
t
PHL
SF00231
Waveform 1. Propagation Delay for Non-inverting Outputs
VOH–0.3V
V
M
V
M
V
M
Yn
t
PZH
t
PHZ
SF00233
OEn
0V
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
VOL+0.3V
V
M
V
M
V
M
Yn
t
PZL
t
PLZ
SF00234
OEn
3.5V
Waveform 3. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE PULSE
POSITIVE PULSE
t
w
AMP (V)
0.3V
0.3V
t
THL (tf
f
)
INPUT PULSE REQUIREMENTS
Rep.Rate
t
w
t
TLHtTHL
1MHz
500ns
2.0ns 2.0ns
Input Pulse Definition
V
CC
Family
74ALS
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= T ermination resistance should be equal to Z
OUT
of
pulse generators.
t
THL (tf
)
t
TLH (tr
)
t
TLH (tr
)
AMP (V)
Amplitude
3.5V
1.3V
V
M
SC00072
R
L
7.0V
SWITCH POSITION
TEST SWITCH
t
PLZ
, t
PZL
closed
All other open
Page 6
74ALS244A/74ALS244–1Octal buffer (3–State)
1991 Feb 08
6
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
Page 7
74ALS244A/74ALS244–1Octal buffer (3–State)
1991 Feb 08
7
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
Page 8
74ALS244A/74ALS244–1Octal buffer (3–State)
1991 Feb 08
8
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
Page 9
74ALS244A/74ALS244–1Octal buffer (3–State)
1991 Feb 08
9
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. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
LIFE SUPPORT APPLICA TIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected 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.
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.
Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice.
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.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
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