74ACT11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS210A − MAY 1987 − REVISED APRIL 1996
D Inputs Are TTL-Voltage Compatible
D Flow-Through Architecture Optimizes
DB, DW, OR NT PACKAGE
(TOP VIEW)
PCB Layout
1Y1
1Y2
1Y3
1Y4
GND
GND
GND
GND
2Y1
2Y2
2Y3
2Y4
D Center-Pin VCC and GND Configurations
D
D
D
Minimize High-Speed Switching Noise
EPICt (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)
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
2A3
1Y4
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
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
MAX
MIN
3.8
5.5 V
4.94
4.8
5.5 V
V
3.85
4.5 V
0.1
0.1
4.5 V
0.36
0.44
5.5 V
IOL = 24 mA
0.1
5.5 V
IOL = 50 mA
A
UNIT
5.4
3.94
MAX
4.4
5.4
4.5 V
IOH = −24 mA
24
4.4
5.5 V
IOH = −75 mA{
VOL
TYP
4.5 V
IOH = −50 mA
50 A
VOH
TA = 25°C
MIN
0.1
0.36
0.44
V
IOL = 75 mA{
5.5 V
IOZ
VO = VCC or GND
5.5 V
±0.5
±5
mA
II
VI = VCC or GND
5.5 V
±0.1
±1
mA
ICC
VI = VCC or GND,
IO = 0
5.5 V
8
80
mA
DICC‡
One input at 3.4 V,
Other inputs at GND or VCC
5.5 V
0.9
1
mA
Ci
VI = VCC or GND
5V
4
pF
Co
VI = VCC or GND
5V
10
pF
1.65
†
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 V .
CC
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V ± 0.5 V (unless otherwise noted)
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
Y
OE
Y
OE
Y
TA = 25°C
MIN
MAX
9.9
1.5
10.6
8
1.5
8.7
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
MIN
TYP
MAX
1.5
6.5
1.5
6
1.5
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
Outputs enabled
Cpd
Power dissipation capacitance per buffer
POST OFFICE BOX 655303
Outputs disabled
• DALLAS, TEXAS 75265
TYP
UNIT
47
CL = 50 pF,
pF
f = 1 MHz
13
pF
3
