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INTEGRATED CIRCUITS
74F1244 Octal buffer (3-State)
Product specification IC15 Data Handbook 1989 Apr 04
Philips Semiconductors
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
FEATURES
* High impedance NPN base inputs for reduced loading
(20A in High and Low states)
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
* Low power, light loading * Functional pin-for-pin equivalent of 74F244 * 1/30th the bus loading of 74F244 * Provides ideal interface and increase fan-out of MOS
microprocessors
* Octal bus interface * 3-State buffer outputs sink 64mA and source 15mA
DESCRIPTION
The 74F1244 is an octal buffer that is ideal for driving bus lines or buffer memory address registers. The outputs are capable of sinking 64mA 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 74F1244 is pin and functionally compatible with the 74F244. The lower power and light bus loading features make it an ideal part to interface directly with MOS microprocessors. TYPE 74F1244
SF00227
TYPICAL PROPAGATION DELAY 4.5ns
TYPICAL SUPPLY CURRENT (TOTAL) 43mA
ORDERING INFORMATION
DESCRIPTION 20-pin plastic DIP 20-pin plastic SOL COMMERCIAL RANGE VCC = 5V 10%, Tamb = 0C to +70C N74F1244N N74F1244D DRAWING NUMBER SOT146-1 SOT163-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS Ian, Ibn OEa, OEb Yan, Ybn Data inputs Output enable inputs (active Low) Data outputs DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/0.033 1.0/0.033 750/106.7 LOAD VALUE HIGH/LOW 20A/20A 20A/20A 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20A in the high state and 0.6mA in the low state.
LOGIC SYMBOL
2 4 6 8 17 15 13 11
IEC/IEEE SYMBOL
1 19 EN1 EN2 18 16 14 12 2 3 5 7 9
Ia0 1 19 OEa OEb
Ia1
Ia2
Ia3 Ib0
Ib1
Ib2
Ib3
2 4 6 8
1
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
SF00228
SF01366
1989 Apr 04
2
853-0041 96221
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
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 IOUT Tamb Tstg 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 range PARAMETER RATING -0.5 to +7.0 -0.5 to +7.0 -30 to +5 -0.5 to VCC 128 0 to +70 -65 to +150 UNIT V V mA V mA C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL IIK IOH IOL Tamb 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 MIN 4.5 2.0 0.8 -18 -15 64 +70 NOM 5.0 MAX 5.5 V V V mA mA mA C UNIT
1989 Apr 04
3
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 10% VCC 5% VCC 10% VCC 5% VCC 10% VCC 5% VCC LIMITS MIN 2.5 2.7 2.0 2.0 0.38 0.42 -0.73 0.55 0.55 -1.2 100 20 -20 50 -50 -100 30 VCC = MAX 57 43 -225 40 75 58 3.4 TYP2 MAX UNIT V V V V V V V A A A A A mA mA mA mA
VO OH
High-level High level output voltage
VCC = MIN, VIL = MAX MAX, VIH = MIN VCC = MIN, VIL = MAX MAX, VIH = MIN
IO = -3mA 3mA OH
IO = -15mA 15mA OH IOL = 48mA IOL = 64mA
VO OL VIK II IIH IIL IOZH IOZL IOS ICC
Low-level Low level output voltage 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 Short-circuit output current3 ICCH Supply current (total) ICCL ICCZ
VCC = MIN, II = IIK VCC = 0.0V, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.5V VCC = MAX, VO = 2.7V VCC = MAX, VO = 0.5V VCC = MAX
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. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITION Tamb = +25C VCC = +5.0V CL = 50pF, RL = 500 MIN tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation delay Ian, Ibn to Yn Output Enable time to High or Low level Output Disable time to High or Low level Waveform 1 Waveform 2 Waveform 3 Waveform 2 Waveform 3 2.5 2.0 3.0 3.0 2.0 2.0 TYP 4.0 5.0 6.0 6.5 4.0 4.0 MAX 5.5 7.0 7.5 8.0 5.5 5.5 Tamb = 0C to +70C VCC = +5.0V 10% CL = 50pF, RL = 500 MIN 2.5 2.0 3.0 3.0 2.0 2.0 MAX 6.0 7.5 8.5 8.5 6.0 6.0 ns ns ns ns ns ns UNIT
1989 Apr 04
4
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
VM
VM tPHL
OEn
VM tPZL
VM tPLZ 3.5V
tPLH
Yn
VM
VM
Yn
VM VOL+0.3V
SF00234 SF00231
Waveform 1.
For Non-Inverting Outputs
Waveform 3. 3-State Output enable Time to Low Level and Output Disable Time from Low Level
OEn
VM
VM
tPZH
tPHZ VOH-0.3V 0V
Yn
VM
SF00233
Waveform 2. 3-State Output Enable Time to High Level and Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
VCC 7.0V VIN PULSE GENERATOR RT D.U.T. VOUT RL NEGATIVE PULSE 90% VM 10% tTHL (tf ) CL RL tTLH (tr ) 90% POSITIVE PULSE 10% tTHL (tf ) AMP (V) 90% VM tw 10% 0V tw VM 10% tTLH (tr ) 0V AMP (V)
90%
Test Circuit for 3-State Outputs SWITCH POSITION TEST tPLZ tPZL All other SWITCH closed closed open
VM
Input Pulse Definition
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.
INPUT PULSE REQUIREMENTS family amplitude VM 74F 3.0V 1.5V rep. rate 1MHz tw 500ns tTLH 2.5ns tTHL 2.5ns
SF00777
1989 Apr 04
5
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
1989 Apr 04
6
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
1989 Apr 04
7
Philips Semiconductors
Product specification
Octal buffer (3-State)
74F1244
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification 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 chages 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.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves 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. 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 1998 All rights reserved. Printed in U.S.A. Date of release: 05-96 Document order number: 9397 750-05192
Philips Semiconductors
1989 Apr 04 8

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