Philips
Semiconductors
74F1244
Octal buffer (3-State)
Product specification
IC15 Data Handbook
1989 Apr 04
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
2
1989 Apr 04
8530041 96221
FEATURES
High impedance NPN base inputs for reduced loading
(20
A 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, 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.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 VCC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY
CURRENT (TOTAL)
74F1244
4.5ns
43mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%,
T
amb
= 0
C to +70
C
DRAWING
NUMBER
20-pin plastic DIP
N74F1244N
SOT146-1
20-pin plastic SOL
N74F1244D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn
Data inputs
1.0/0.033
20
A/20
A
OEa, OEb
Output enable inputs (active Low)
1.0/0.033
20
A/20
A
Yan, Ybn
Data outputs
750/106.7
15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the high state and 0.6mA 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
VCC = Pin 20
GND = Pin 10
OEb
19
IEC/IEEE SYMBOL
2
1
EN1
1
2
SF01366
19
4
6
8
17
15
13
11
EN2
9
7
5
3
12
14
16
18
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
3
LOGIC DIAGRAM
VCC
=
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
OEb
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
I
OUT
Current applied to output in Low output state
128
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
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
I
OL
Low-level output current
64
mA
T
amb
Operating free-air temperature range
0
+70
C
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
4
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
2
MAX
UNIT
I
O
= 3mA
10% V
CC
2.5
V
V
O
High level output voltage
V
CC
= MIN,
V
IL
= MAX
I
OH
= 3mA
5% V
CC
2.7
3.4
V
V
OH
High-level output voltage
V
IL
= MAX,
V
IH
= MIN
I
O
= 15mA
10% V
CC
2.0
V
I
OH
= 15mA
5% V
CC
2.0
V
V
O
Low level output voltage
V
CC
= MIN,
V
IL
= MAX
I
OL
= 48mA
10% V
CC
0.38
0.55
V
V
OL
Low-level output voltage
V
IL
= MAX,
V
IH
= MIN
I
OL
= 64mA
5% V
CC
0.42
0.55
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.2
V
I
I
Input current at maximum input voltage
V
CC
= 0.0V, V
I
= 7.0V
100
A
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
IL
Low-level input current
V
CC
= MAX, V
I
= 0.5V
20
A
I
OZH
Off-state output current,
High-level voltage applied
V
CC
= MAX, V
O
= 2.7V
50
A
I
OZL
Off-state output current,
Low-level voltage applied
V
CC
= MAX, V
O
= 0.5V
50
A
I
OS
Short-circuit output current
3
V
CC
= MAX
100
225
mA
I
CCH
30
40
mA
I
CC
Supply current (total)
I
CCL
V
CC
= MAX
57
75
mA
I
CCZ
43
58
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. Not more than one output should be shorted at a time. For testing I
OS
, 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, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST
CONDITION
T
amb
= +25
C
V
CC
= +5.0V
C
L
= 50pF, R
L
= 500
T
amb
= 0
C to +70
C
V
CC
= +5.0V
10%
C
L
= 50pF, R
L
= 500
UNIT
MIN
TYP
MAX
MIN
MAX
t
PLH
t
PHL
Propagation delay
Ian, Ibn to Yn
Waveform 1
2.5
2.0
4.0
5.0
5.5
7.0
2.5
2.0
6.0
7.5
ns
ns
t
PZH
t
PZL
Output Enable time
to High or Low level
Waveform 2
Waveform 3
3.0
3.0
6.0
6.5
7.5
8.0
3.0
3.0
8.5
8.5
ns
ns
t
PHZ
t
PLZ
Output Disable time
to High or Low level
Waveform 2
Waveform 3
2.0
2.0
4.0
4.0
5.5
5.5
2.0
2.0
6.0
6.0
ns
ns
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
5
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
V
M
V
M
V
M
V
M
Yn
Ian, Ibn
t
PLH
t
PHL
SF00231
Waveform 1. For Non-Inverting Outputs
V
OH
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
V
OL
+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
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
RL
7.0V
SF00777
TEST
SWITCH
t
PLZ
closed
t
PZL
closed
All other
open
SWITCH POSITION
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
6
DIP20:
plastic dual in-line package; 20 leads (300 mil)
SOT146-1
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
7
SO20:
plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
1989 Apr 04
8
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 940883409
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
Philips
Semiconductors
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
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.
Data sheet status
[1]
Please consult the most recently issued datasheet before initiating or completing a design.
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