Page 1
INTEGRATED CIRCUITS
74F1244
Octal buffer (3-State)
Product specification
IC15 Data Handbook
1989 Apr 04
Page 2
Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
FEA TURES
•High impedance NPN base inputs for reduced loading
(20µA in High and Low states)
•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, OE
and OE
b, 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.
a
PIN CONFIGURATION
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
Yb3
10 11
GND
TYPICAL
TYPE
PROPAGATION
DELAY
74F1244 4.5ns 43mA
20
V
CC
19
OEb
18
Ya0
17
Ib0
16
Ya1
15
Ib1
14
Ya2
13
Ib2
12
Ya3
Ib3
SF00227
TYPICAL SUPPL Y
CURRENT (TOTAL)
ORDERING INFORMATION
COMMERCIAL RANGE
V
DESCRIPTION
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
20-pin plastic DIP N74F1244N SOT146-1
20-pin plastic SOL N74F1244D SOT163-1
DRAWING
NUMBER
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION
Ian, Ibn Data inputs 1.0/0.033 20µA/20µA
OEa, OEb Output enable inputs (active Low) 1.0/0.033 20µA/20µA
Yan, Ybn Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
LOGIC SYMBOL
1
OEa
OEb19
V
= Pin 20
CC
GND = Pin 10
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
18 16 14 12 3 5 7 9
SF00228
IEC/IEEE SYMBOL
1
19
2
4
6
8
17
15
13
11
74F (U.L.)
HIGH/LOW
EN1
EN2
1
2
SF01366
LOAD VALUE
HIGH/LOW
18
16
14
12
3
5
7
9
1989 Apr 04 853–0041 96221
2
Page 3
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74F1244Octal buffer (3-State)
LOGIC DIAGRAM
2
Ia0
4
Ia1
6
Ia2
18
Ya0
16
Ya1
14
Ya2
Ib0
Ib1
Ib2
17
15
13
3
Yb0
5
Yb1
7
Yb2
FUNCTION TABLE
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
Ia3
OEa
V
= Pin 20
CC
GND = Pin 10
8
1
12
Ya3
Ib3
OEb
11
19
9
SF00230
Yb3
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
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
Input current –30 to +5 mA
Voltage applied to output in High output state –0.5 to V
Current applied to output in Low output state 128 mA
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
PARAMETER RATING UNIT
INPUTS OUTPUTS
CC
V
RECOMMENDED OPERATING CONDITIONS
V
V
V
I
I
I
T
CC
IH
IL
IK
OH
OL
amb
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
Low-level input voltage 0.8 V
Input clamp current –18 mA
High-level output current –15 mA
Low-level output current 64 mA
Operating free-air temperature range 0 +70 °C
LIMITS
MIN NOM MAX
1989 Apr 04
3
Page 4
Philips Semiconductors Product specification
SYMBOL
PARAMETER
TEST CONDITIONS
1
UNIT
I
3mA
VOHHigh-level output voltage
V
MAX
I
15mA
VOLLow-level output voltage
V
MAX
74F1244Octal buffer (3-State)
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MIN TYP
V
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
CC
= –
VCC = MIN,
p
V
=
IL
= MIN
IH
VCC = MIN,
p
IK
Input clamp voltage VCC = MIN, II = I
V
=
IL
= MIN
IH
OH
,
= –
OH
IOL = 48mA ±10% V
,
IOL = 64mA ±5% V
IK
±10% V
±5% V
±10% V
±5% V
CC
CC
CC
Input current at maximum input voltage VCC = 0.0V, VI = 7.0V 100 µA
High-level input current VCC = MAX, VI = 2.7V 20 µA
Low-level input current VCC = MAX, VI = 0.5V –20 µA
Off-state output current,
High-level voltage applied
Off-state output current,
Low-level voltage applied
Short-circuit output current
Supply current (total)
3
I
CCH
I
CCL
I
CCZ
VCC = MAX, VO = 2.7V 50 µA
VCC = MAX, VO = 0.5V –50 µA
VCC = MAX –100 –225 mA
VCC = MAX
2.5 V
CC
2.7 3.4 V
2.0 V
CC
2.0 V
CC
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
3. Not more than one output should be shorted at a time. For testing I
= 5V, T
CC
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
amb
= 25°C.
, the use of high-speed test apparatus and/or sample-and-hold
OS
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, I
tests should be performed last.
OS
2
MAX
0.38 0.55 V
0.42 0.55 V
–0.73 –1.2 V
30 40 mA
57 75 mA
43 58 mA
AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
1989 Apr 04
Propagation delay
Ian, Ibn to Yn
Output Enable time
to High or Low level
Output Disable time
to High or Low level
TEST
CONDITION
Waveform 1
Waveform 2
Waveform 3
Waveform 2
Waveform 3
LIMITS
T
= +25°C
amb
VCC = +5.0V
= 50pF, RL = 500Ω
C
L
T
amb
VCC = +5.0V ± 10%
= 50pF, RL = 500Ω
C
L
MIN TYP MAX MIN MAX
2.5
2.0
3.0
3.0
2.0
2.0
4.0
5.0
6.0
6.5
4.0
4.0
5.5
7.0
7.5
8.0
5.5
5.5
2.5
2.0
3.0
3.0
2.0
2.0
4
= 0°C to +70°C
6.0
7.5
8.5
8.5
6.0
6.0
UNIT
ns
ns
ns
ns
ns
ns
Page 5
Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
Yn
V
M
t
PLH
V
M
t
PHL
V
M
V
M
SF00231
Waveform 1. For Non-Inverting Outputs
OEn
V
M
t
PZH
Yn
V
M
t
PHZ
V
M
VOH–0.3V
SF00233
Waveform 2. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
OEn
V
M
t
PZL
Yn
V
M
t
PLZ
3.5V
V
M
VOL+0.3V
SF00234
Waveform 3. 3-State Output enable Time to Low Level and
Output Disable Time from Low Level
0V
V
CC
R
PULSE
GENERATOR
V
IN
R
T
D.U.T.
V
OUT
L
C
R
L
L
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST SWITCH
t
t
PLZ
PZL
closed
closed
All other open
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
C
= Load capacitance includes jig and probe capacitance;
L
see AC electrical characteristics for value.
= Termination resistance should be equal to Z
R
T
pulse generators.
OUT
of
7.0V
NEGATIVE
PULSE
POSITIVE
PULSE
family
74F
90%
10%
amplitude
t
w
V
M
10%
)
V
90%
M
t
THL (tf
t
TLH (tr
)
t
TLH (tr
t
THL (tf
t
w
Input Pulse Definition
INPUT PULSE REQUIREMENTS
V
rep. rate
M
3.0V
1.5V
1MHz 500ns
10%
)
)
90%
t
w
V
M
V
M
90%
10%
t
TLHtTHL
2.5ns 2.5ns
SF00777
AMP (V)
0V
AMP (V)
0V
1989 Apr 04
5
Page 6
Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
1989 Apr 04
6
Page 7
Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1989 Apr 04
7
Page 8
Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
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.
[1]
[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
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
1989 Apr 04
8
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