74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B − JANUARY 1989 − REVISED APRIL 1996
D
Inputs Are TTL-Voltage Compatible
D
3-State Outputs Interface Directly With
D
D
D
D
D
D
System Bus
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC
and GND Configurations
Minimize High-Speed Switching Noise
EPICt
(Enhanced-Performance Implanted
CMOS) 1-mm Process
500-mA Typical Latch-Up Immunity at
125°C
Provides Bus Interface From Multiple
Sources in High-Performance Systems
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, and Standard
Plastic 300-mil DIPs (N)
DB, DW, OR N PACKAGE
(TOP VIEW)
A /B
1Y
2Y
GND
GND
GND
GND
3Y
4Y
OE
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1A
1B
2A
2B
V
CC
V
CC
3A
3B
4A
4B
description
The 74ACT11257 is designed to multiplex signals from 4-bit data sources to four output data lines in
bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at
a high logic level.
The 74ACT11257 is characterized for operation from −40°C to 85°C.
FUNCTION TABLE
INPUTS
OE
H
L
L
L
L
SELECT
A/B
X
L
L
H
H
DATA
A
X
L
H
X
X
B
X
X
X
L
H
Z
L
H
L
H
OUTPUT
Y
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.
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.
Copyright
©
1996, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B − JANUARY 1989 − REVISED APRIL 1996
logic symbol
†
OE
A/B
1A
1B
2A
2B
3A
3B
4A
4B
†
10
1
20
19
18
17
14
13
12
11
EN
G1
1
1
3
2Y
MUX
2
1Y
8
3Y
9
4Y
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OE
A/B
10
1
1A
1B
2A
2B
3A
3B
4A
4B
20
19
18
17
14
13
12
11
2
1Y
3
2Y
8
3Y
9
4Y
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B − JANUARY 1989 − REVISED APRIL 1996
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range, V
I
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to V
CC
+ 0.5 V
Output voltage range, V
O
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to V
CC
+ 0.5 V
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±20
mA
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±50
mA
Continuous output current, I
O
(V
O
= 0 to V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±50
mA
Continuous current through V
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±100
mA
Maximum power dissipation at T
A
= 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . . 0.6 W
DW package . . . . . . . . . . . . . . . . . . 1.6 W
N package . . . . . . . . . . . . . . . . . . . . 1.3 W
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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 N package, which has a trace length of zero.
†
recommended operating conditions
MIN
V
CC
V
IH
V
IL
V
I
V
O
I
OH
I
OL
Dt/Dv
T
A
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
Output voltage
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
0
−40
0
0
4.5
2
0.8
V
CC
V
CC
−24
24
10
85
MAX
5.5
UNIT
V
V
V
V
V
mA
mA
ns/V
°C
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B − JANUARY 1989 − REVISED APRIL 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETERS
I
OH
= −50
mA
50 A
V
OH
I
OH
= −24 mA
24
I
OH
= −75 mA
{
I
OL
= 50
mA
A
V
OL
I
OL
= 24 mA
I
OL
= 75 mA
{
I
OZ
I
I
I
CC
DI
CC‡
C
i
C
o
†
‡
TEST CONDITIONS
V
CC
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
T
A
= 25°C
MIN
4.4
5.4
3.94
4.94
TYP
MAX
MIN
4.4
5.4
3.8
4.8
3.85
MAX
UNIT
V
0.1
0.1
0.36
0.36
±0.5
±0.1
8
0.9
3.5
8
0.1
0.1
0.44
0.44
1.65
±5
±1
80
1
mA
mA
mA
mA
pF
pF
V
V
O
= V
CC
or GND
V
I
= V
CC
or GND
V
I
= V
CC
or GND,
One input at 3.4 V,
V
I
= V
CC
or GND
V
O
= V
CC
or GND
I
O
= 0
Other inputs at V
CC
or GND
5.5 V
5.5 V
5V
5V
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 to V
CC
.
switching characteristics over recomended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
PARAMETER
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
FROM
(INPUT)
A or B
A /B
OE
OE
TO
(OUTPUT)
Y
Any Y
Any Y
Any Y
T
A
= 25°C
MIN
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
TYP
4.4
5
4.7
5.7
4.2
5.5
5.7
6
MAX
6.4
8
7.6
8.5
6.9
8.7
7.6
7.9
MIN
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
MAX
6.9
8.7
8.2
9.4
7.3
9.6
8.4
8.5
ns
ns
ns
ns
UNIT
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER
Outputs enabled
C
pd
Power dissipation capacitance
Outputs disabled
C
L
= 50 pF,
pF
f = 1 MHz
TEST CONDITIONS
TYP
41
13
pF
UNIT
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B − JANUARY 1989 − REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
2
×
V
CC
From Output
Under Test
C
L
= 50 pF
(see Note A)
500
Ω
S1
Open
GND
500
Ω
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
2
×
V
CC
GND
LOAD CIRCUIT
3V
Input
1.5 V
t
PLH
In-Phase
Output
t
PHL
Out-of-Phase
Output
50% V
CC
50% V
CC
1.5 V
0V
t
PHL
V
OH
50% V
CC
V
OL
t
PLH
V
OH
50% V
CC
V
OL
Output
Waveform 2
S1 at GND
(see Note B)
Output
Waveform 1
S1 at 2
×
V
CC
(see Note B)
t
PZH
Output
Control
(low-level
enabling)
3V
1.5 V
t
PZL
t
PLZ
50% V
CC
t
PHZ
80% V
CC
V
OH
[
0V
20% V
CC
[
V
CC
V
OL
1.5 V
0V
50% V
CC
VOLTAGE WAVEFORMS
VOLTAGE WAVEFORMS
NOTES: A. C
L
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, Z
O
= 50
Ω,
t
r
= 3 ns, t
f
= 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
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5
Embedded System
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