Page 1
INTEGRATED CIRCUITS
74F1240
Octal inverter buffer (3-State)
74F1241
Octal buffer (3-State)*
* Discontinued part. Please see the Discontinued Product List.
Product specification
Supercedes data of 1989 Apr 04
IC15 Data Handbook
1999 Jan 08
Page 2
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
74F1240 Octal inverter buffer (3-State)
FEATURES
•High impedance NPN base inputs for reduced loading
(20µA in High and Low states)
•Low power, light loading
•Functional pin-for-pin equivalent of 74F240 and 74F241
TYPE
74F1240 3.5ns 40mA
74F1241 4.5ns 46mA
TYPICAL
PROPAGATION
DELAY
•1/30th the bus loading of 74F240 and 74F241
•Provides ideal interface and increase fan-out of MOS
microprocessors
•Octal bus interface
•3-State buffer outputs sink 64mA
•15mA source current
DESCRIPTION
The 74F1240 and 74F1241 are octal buffers that are 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
outputs.
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
OEb Output enable input (active High, 74F1241) 1.0/0.033 20µA/20µA
Yan, Ybn Data outputs (74F1241) 750/106.7 15mA/64mA
Yan, Ybn Data outputs (74F1240) 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.
a and OEb, each controlling four of the 3-State
ORDERING INFORMATION
COMMERCIAL RANGE
V
DESCRIPTION
20-pin plastic DIP N74F1240N SOT146-1
20-pin plastic SOL N74F1240D SOT163-1
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
74F (U.L.)
HIGH/LOW
TYPICAL
SUPPLY CURRENT
(TOTAL)
DRAWING
NUMBER
LOAD VALUE
HIGH/LOW
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08 853–0039 20619
2
Page 3
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
PIN CONFIGURATION – 74F1240
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Y
b1
6
Ia2
7
Y
b2
8
Ia3
9
Yb3
10 11
GND
20
19
18
17
16
15
14
13
12
SF00320
LOGIC SYMBOL – 74F1240
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
119OEa
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
V
OEb
Y
Ib0
Y
Ib1
Y
Ib2
Ya3
Ib3
PIN CONFIGURATION – 74F1241
V
1
CC
a0
a1
a2
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
Yb3
10 11
GND
20
19
18
17
16
15
14
13
12
SF00324
CC
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
LOGIC SYMBOL – 74F1241
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
1
OEa
19
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
181614123579
VCC = Pin 20
GND = Pin 10
IEC/IEEE SYMBOL – 74F1240
1
19
2
4
6
8
17
15
13
11
EN1
EN2
18 16 14 12 3 5 7 9
VCC = Pin 20
SF00321
GND = Pin 10
SF00325
IEC/IEEE SYMBOL – 74F1241
1
19
1
2
18
16
14
12
3
5
7
9
SF01367
2
4
6
8
17
15
13
11
EN1
EN2
1
2
18
16
14
12
3
5
7
9
SF01368
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
3
Page 4
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
LOGIC DIAGRAM – 74F1240
218
Ia0
416
Ia1
614
Ia2
812
Ia3
1
OEa
17 3
Ib0
15 5
Ib1
13 7
Ib2
11 9
Ib3
19
OEb
Ya0
Ya1
Ya2
Ya3
Yb0
Yb1
Yb2
Yb3
SF01369
FUNCTION TABLE – 74F1240
INPUTS OUTPUTS
OEa Ia OEb Ib Ya Yb
L L L L H H
L H L H L L
H X H X Z Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
LOGIC DIAGRAM – 74F1241
218
Ia0
416
Ia1
614
Ia2
812
Ia3
1
OEa
17 3
Ib0
15 5
Ib1
13 7
Ib2
11 9
Ib3
19
OEb
Ya0
Ya1
Ya2
Ya3
Yb0
Yb1
Yb2
Yb3
SF01370
FUNCTION TABLE – 74F1241
INPUTS OUTPUTS
OEa Ia OEb Ib Ya Yb
L L H L L L
L H H H H H
H X L 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
V
V
I
IN
V
I
OUT
T
T
CC
IN
OUT
amb
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
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
PARAMETER RATING UNIT
4
CC
V
Page 5
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
UNIT
I
3mA
VOHHigh-level output voltage
V
MAX
I
15mA
VOLLow-level output voltage
V
MAX
ICCSupply current (total)
74F1240, 74F1241*Buffers
RECOMMENDED OPERATING CONDITIONS
LIMITS
MIN NOM MAX
V
CC
V
IH
V
IL
I
IK
I
OH
I
OL
T
amb
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
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
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
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 TYP MAX
VCC = MIN
p
p
=
IL
VIH = MIN
VCC = MIN
=
IL
VIH = MIN
IOL = 48mA ±10% V
IOL = 64mA ±5% V
Input clamp voltage VCC = MIN, II = I
OH
OH
IK
= –
= –
±10% V
±5% V
±10% V
±5% V
CC
CC
CC
2.4 V
CC
2.7 3.3 V
2.0 V
CC
2.0 V
CC
0.38 0.55 V
0.42 0.55 V
–0.73 –1.2 V
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
pp
= 5V, T
CC
tests should be performed last.
OS
3
74F1240
74F1241
= 25°C.
amb
I
I
I
I
I
I
VCC = MAX, VO = 2.7V 50 µA
VCC = MAX, VO = 0.5V –50 µA
VCC = MAX –100 –225 mA
CCH
CCL
CCZ
CCH
CCL
CCZ
VCC = MAX
VCC = MAX
OS
, the use of high-speed test apparatus and/or sample-and-hold
22 30 mA
58 75 mA
44 58 mA
33 44 mA
62 80 mA
45 60 mA
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
5
Page 6
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
SYMBOL PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
Ian, Ibn, to Yn
Output Enable time
to High or Low level
Output Disable time
to High or Low level
Propagation delay
Ian, Ibn, to Yn
Output Enable time
to High or Low level
Output Disable time
to High or Low level
74F1240
74F1241
TEST
CONDITION
Waveform 1
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
= +25°C
amb
VCC = +5.0V
C
= 50pF, RL = 500Ω
L
MIN TYP MAX MIN MAX
3.0
1.5
3.0
4.0
2.0
2.0
2.5
2.5
3.0
3.0
3.0
3.0
4.5
2.5
5.5
7.0
4.0
4.0
4.0
5.0
5.5
6.5
5.5
6.0
6.5
4.5
7.5
9.0
6.0
5.5
5.5
6.5
7.0
8.0
7.5
8.0
T
= 0°C to +70°C
amb
VCC = +5.0V ± 10%
C
= 50pF, RL = 500Ω
L
2.5
1.5
3.0
4.0
2.0
2.0
2.5
2.5
3.0
3.0
3.0
3.0
7.5
5.0
8.0
9.5
6.5
6.0
6.0
7.0
7.5
8.5
8.5
8.5
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
OEn
OEb
n
Yn, Y
Waveform 3. 3-State Output Enable Time to High Level and
V
M
t
PHL
Yn
V
M
t
PLH
V
V
M
M
Waveform 1. For Inverting Outputs
V
M
t
PZH
V
M
t
PHZ
V
M
Output Disable Time from High Level
SF00328
VOH -0.3V
SF00330
Ian, Ibn
Yn
V
M
t
PLH
V
M
t
PHL
V
V
M
M
SF00329
Waveform 2. For Non-inverting Outputs
OEn
OEb
Yn, Y
0V
n
V
t
PZL
M
V
V
M
t
PLZ
M
3.5V
VOL +0.3V
SF00331
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
6
Page 7
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
TEST CIRCUIT AND WAVEFORMS
V
CC
PULSE
GENERATOR
V
IN
R
T
D.U.T.
V
OUT
Test Circuit for Open Collector Outputs
SWITCH POSITION
TEST SWITCH
t
t
PLZ
PZL
closed
closed
All other open
7.0V
R
L
R
C
L
L
NEGATIVE
PULSE
POSITIVE
PULSE
90%
10%
V
M
10%
t
THL (tf
t
TLH (tr
90%
V
M
Input Pulse Definition
t
w
V
M
10%
)
)
t
w
t
TLH (tr
t
THL (tf
)
)
90%
V
M
90%
10%
AMP (V)
0V
AMP (V)
0V
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
= Load capacitance includes jig and probe capacitance;
C
L
see AC electrical characteristics for value.
R
= Termination resistance should be equal to Z
T
pulse generators.
OUT
of
family
74F
INPUT PULSE REQUIREMENTS
V
amplitude
3.0V
M
1.5V
rep. rate
1MHz 500ns
t
w
t
TLH
t
THL
2.5ns 2.5ns
SF00128
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
7
Page 8
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
* Discontinued part. Please see the Discontinued Product List.
1999 Jan 08
8
Page 9
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
* Discontinued part. Please see the Discontinued Product List.
1999 Jan 08
9
Page 10
Philips Semiconductors Product specification
74F1240, 74F1241*Buffers
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: 03-98
Document order number: 9397-750-05191
* Discontinued part. Please see the Discontinued Product List in Section 1, page 21.
* Discontinued part. Please see the Discontinued Product List.
1999 Jan 08
10
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