74ACT11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS210A – MAY 1987 – REVISED APRIL 1996
D
D
D
D
D
D
DB, DW, OR NT PACKAGE
(TOP VIEW)
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin VCC and GND Configurations
Minimize High-Speed Switching Noise
EPIC t (Enhanced-Performance Implanted
CMOS) 1-mm Process
500-mA Typical Latch-Up Immunity at
125°C
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, and Standard
Plastic 300-mil DIPs (NT)
1Y1
1Y2
1Y3
1Y4
GND
GND
GND
GND
2Y1
2Y2
2Y3
2Y4
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
1OE
1A1
1A2
1A3
1A4
VCC
VCC
2A1
2A2
2A3
2A4
2OE
description
This octal buffer or line driver is designed specifically to improve both the performance and density of 3-state
memory address drivers, clock drivers, and bus-oriented receivers and transmitters. This device provides
inverting outputs and symmetrical active-low output-enable (OE) inputs. This device features high fan-out and
improved fan-in.
The 74ACT11240 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE
A
OUTPUT
Y
L
H
L
L
L
H
H
X
Z
logic symbol†
1OE
1A1
1A2
1A3
1A4
24
23
EN
2OE
1
1
22
2
21
3
20
4
1Y1
2A1
1Y2
2A2
1Y3
1Y4
2A3
2A4
13
17
EN
1
9
16
10
15
11
14
12
2Y1
2Y2
2Y3
2Y4
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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• DALLAS, TEXAS 75265
1
74ACT11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS210A – MAY 1987 – REVISED APRIL 1996
logic diagram (positive logic)
1OE
1A1
1A2
1A3
1A4
13
24
2OE
23
1 1Y1
22
2
21
3
20
4
2A1
1Y2
2A2
1Y3
2A3
1Y4
2A4
9 2Y1
17
16
10
15
11
14
12
2Y2
2Y3
2Y4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . 0.65 W
DW package . . . . . . . . . . . . . . . . . 1.7 W
NT package . . . . . . . . . . . . . . . . . . 1.3 W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150_C and a board trace length of 750 mils,
except for the NT package, which has a trace length of zero.
recommended operating conditions
2
MIN
NOM
MAX
4.5
5
5.5
VCC
VIH
Supply voltage
VIL
VI
Low-level input voltage
Input voltage
0
VO
IOH
Output voltage
0
IOL
Dt/Dv
Low-level output current
TA
Operating free-air temperature
High-level input voltage
2
High-level output current
Input transition rise or fall rate
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UNIT
V
V
0.8
V
VCC
VCC
V
–24
mA
V
24
mA
0
10
ns/V
–40
85
°C
74ACT11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS210A – MAY 1987 – REVISED APRIL 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
4.5 V
IOH = –50
50 mA
VOH
24 mA
IOH = –24
IOH = –75 mA{
IOZ
II
IOL = 24 mA
IOL = 75 mA{
VO = VCC or GND
ICC
VI = VCC or GND
VI = VCC or GND,
DICC‡
One input at 3.4 V,
Ci
TA = 25°C
TYP
MAX
MIN
4.4
4.4
5.5 V
5.4
5.4
4.5 V
3.94
3.8
5.5 V
4.94
MAX
UNIT
V
4.8
5.5 V
IOL = 50 mA
VOL
MIN
3.85
4.5 V
0.1
5.5 V
0.1
0.1
0.1
4.5 V
0.36
0.44
5.5 V
0.36
0.44
5.5 V
V
1.65
5.5 V
±0.5
±5
mA
5.5 V
±0.1
±1
mA
IO = 0
5.5 V
8
80
mA
Other inputs at GND or VCC
5.5 V
0.9
1
mA
VI = VCC or GND
VI = VCC or GND
5V
4
pF
Co
5V
10
† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
pF
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V ± 0.5 V (unless otherwise noted)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
MIN
TA = 25°C
TYP
MAX
MIN
MAX
1.5
6.5
9.9
1.5
10.6
1.5
6
8
1.5
8.7
1.5
7.5
11.7
1.5
12.5
1.5
7.3
11.5
1.5
12.3
1.5
7.3
9.4
1.5
10
1.5
7.9
10.3
1.5
10.8
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
d
Power dissipation capacitance per buffer
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TEST CONDITIONS
Outputs enabled
Outputs disabled
• DALLAS, TEXAS 75265
CL = 50 pF,
pF
f = 1 MHz
TYP
47
13
UNIT
pF
3
74ACT11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS210A – MAY 1987 – REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
500 Ω
From Output
Under Test
Open
GND
500 Ω
CL = 50 pF
(see Note A)
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
GND
LOAD CIRCUIT
Output
Control
(low-level
enabling)
3V
Input
1.5 V
1.5 V
0V
tPHL
Output
tPLH
VOH
50% VCC
VOL
50% VCC
3V
0V
tPZL
[ VCC
tPLZ
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
1.5 V
1.5 V
50% VCC
VOL
tPHZ
tPZH
VOLTAGE WAVEFORMS
20% VCC
50% VCC
80% VCC
VOH
[0V
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
4
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