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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
* 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, OEa 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. TYPICAL PROPAGATION DELAY 4.5ns 4.5ns TYPICAL SUPPLY CURRENT (TOTAL) 17mA 17mA
PIN CONFIGURATION
OEa 1 Ia0 2 Yb0 3 Ia1 4 Yb1 5 Ia2 6 Yb2 7 Ia3 8 Yb3 9 GND 10 20 VCC 19 OEb 18 Ya0 17 Ib0 16 Ya1 15 Ib1 14 Ya2 13 Ib2 12 Ya3 11 Ib3
SF00227
ORDERING INFORMATION
ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V 10%, Tamb = 0C to +70C 74ALS244AN, 74ALS244A-1N 74ALS244AD, 744ALS244A-1D 74ALS244ADB, 74ALS244A-1DB DRAWING NUMBER
TYPE 74ALS244A 74ALS244A-1
20-pin plastic DIP 20-pin plastic SOL 20-pin plastic SSOP Type II
SOT146-1 SOT163-1 SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS Ian, Ibn OEa, OEb Yan, Ybn Yan, Ybn DESCRIPTION Data inputs Output Enable inputs (active-Low) Data outputs Data outputs (-1 version) 74ALS (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 750/240 750/480 LOAD VALUE HIGH/LOW 20A/0.1mA 20A/0.1mA 15mA/24mA 15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20A in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
2 4 6 8 17 15 13 11
IEC/IEEE SYMBOL
1 19 EN1 EN2
Ia0 1 19 OEa OEb
Ia1
Ia2
Ia3 Ib0
Ib1
Ib2
Ib3
2 4 6 8
2D
1
18 16 14 12
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 17 15 18 VCC = Pin 20 GND = Pin 10 16 14 12 3 5 7 9 13 11
2
3 5 7 9
SF00228
SF00229
1991 Feb 08
2
853-1277 01670
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
LOGIC DIAGRAM
Ia0 2 18 Ya0 Ib0 17 3 Yb0
FUNCTION TABLE
INPUTS OEa L
Yb1
OUTPUTS Ib L H X Ya L H Z Yb L H Z
Ia L H X
OEb L L H
Ia1
4
16
Ya1
Ib1
15
5
L
Ia2 6 14 Ya2 Ib2 13 7 Yb2
H H L X Z = = = =
Ia3
8
12
Ya3
Ib3
11
9
Yb3
OEa
1
OEb
19
High voltage level Low voltage level Don't care High impedance "off" state
VCC = Pin 20 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 VCC VIN IIN VOUT IO OUT Tamb Tstg Supply voltage Input voltage Input current Voltage applied to output in High output state All versions Current applied to output in Low output state Operating free-air temperature range Storage temperature range -1 version PARAMETER RATING -0.5 to +7.0 -0.5 to +7.0 -30 to +5 -0.5 to VCC 48 96 0 to +70 -65 to +150 UNIT V V mA V mA mA C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL IIK IOH IO OL Tamb Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current All versions Low-level Low level output current Operating free-air temperature range -1 versions 0 PARAMETER MIN 4.5 2.0 0.8 -18 -15 24 481 +70 NOM 5.0 MAX 5.5 UNIT V V V mA mA mA mA C
NOTES: 1. The 48mA limit applies only under the condition of VCC = 5.0V 5%.
1991 Feb 08
3
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 VCC10%, VIL = MAX, , , VIH = MIN VCC = MIN, VIL = MAX, VIH = MIN All versions VOL Low level output Low-level out ut voltage -1 version VIK II IIH IIL IOZH IOZL IO ICC Input clamp voltage Input current at maximum input voltage High-level input current Low-level input current Off-state output current, High-level voltage applied Off-state output current, Low-level voltage applied Output current3 ICCH Supply current (total) ICCL ICCZ VCC = MAX VCC = MIN, VIL = MAX, , , VIH = MIN VCC = 4.75V, VIL = MAX, VIH = MIN VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.4V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.4V VCC = MAX, VO = 2.25V -30 6.5 19.5 25 IOH = -0.4mA IOH = -3mA IOH = -15mA IOL = 12mA IOL = 24mA IOL = 48mA LIMITS MIN VCC - 2 2.4 2.0 0.25 0.35 0.35 -0.73 0.40 0.50 0.50 -1.5 0.1 20 -0.1 20 -20 -112 15 24 30 3.2 TYP2 MAX UNIT V V V V V V V mA A mA A A mA mA mA mA
VOH
High level output High-level out ut voltage
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 VCC = 5V, Tamb = 25C. 3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
AC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITION Tamb = 0C to +70C VCC = +5.0V 10% CL = 50pF, RL = 500 MIN tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation delay In to Yn Output enable time to High or Low level Output disable time from High or Low level Waveform 1 Waveform 2 Waveform 3 Waveform 2 Waveform 3 1.5 1.5 1.0 2.5 2.5 2.5 MAX 10.0 10.0 10.0 12.0 10.0 12.0 ns ns ns UNIT
1991 Feb 08
4
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244A-1
AC WAVEFORMS
For all waveforms, VM = 1.3V.
Ian, Ibn
VM
VM tPHL
tPLH
Yn
VM
VM
SF00231
Waveform 1. Propagation Delay for Non-inverting Outputs
OEn
VM
VM
OEn
VM tPZL
VM tPLZ 3.5V
tPZH
tPHZ VOH-0.3V Yn 0V
Yn
VM
VM VOL+0.3V
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
VCC 7.0V NEGATIVE PULSE 90% VM 10% tTHL (tff) CL RL tw VM 10% tTLH (tr ) 0.3V 90% AMP (V)
VIN PULSE GENERATOR RT D.U.T.
VOUT
RL
tTLH (tr ) 90%
tTHL (tf ) AMP (V) 90% VM tw 10% 0.3V
Test Circuit for 3-State Outputs SWITCH POSITION TEST SWITCH closed tPLZ, tPZL All other open
POSITIVE PULSE 10%
VM
Input Pulse Definition INPUT PULSE REQUIREMENTS Family Amplitude VM 74ALS 3.5V 1.3V Rep.Rate 1MHz tw 500ns tTLH 2.0ns tTHL 2.0ns
DEFINITIONS: RL = Load resistor; see AC electrical characteristics for value. CL = Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value. RT = Termination resistance should be equal to ZOUT of pulse generators.
SC00072
1991 Feb 08
5
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244-1
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
1991 Feb 08
6
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
1991 Feb 08
7
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
1991 Feb 08
8
Philips Semiconductors
Product specification
Octal buffer (3-State)
74ALS244A/74ALS244-1
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
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 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.
Preliminary Specification
Preproduction Product
Product Specification
Full Production
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 APPLICATIONS 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. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A.
Philips Semiconductors
1991 Feb 08 9
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