SN74LVC257A-EP
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS736B – NOVEMBER 2005 – REVISED JANUARY 2007
FEATURES
•
Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
Extended Temperature Performance of –55°C
to 125°C
Enhanced Diminishing Manufacturing Sources
(DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree
(1)
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
justifying use of this component beyond specified
performance and environmental limits.
•
•
•
•
•
•
•
•
•
•
Operates From 2 V to 3.6 V
Inputs Accept Voltages to 5.5 V
Max t
pd
of 4.6 ns at 3.3 V
Typical V
OLP
(Output Ground Bounce) <0.8 V
at V
CC
= 3.3 V, T
A
= 25°C
Typical V
OHV
(Output V
OH
Undershoot) >2 V at
V
CC
= 3.3 V, T
A
= 25°C
D OR PW PACKAGE
(TOP VIEW)
(1)
A/B
1A
1B
1Y
2A
2B
2Y
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OE
4A
4B
4Y
3A
3B
3Y
DESCRIPTION/ORDERING INFORMATION
The SN74LVC257A-EP quadruple 2-line to 1-line data selector/multiplexer is designed for 2.7-V to 3.6-V V
CC
operation.
The device is designed to multiplex signals from 4-bit data sources to 4-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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
T
A
–40°C to 125°C
–55°C to 125°C
(1)
(2)
SOIC – D
TSSOP – PW
SOIC – D
TSSOP – PW
PACKAGE
(1)
Reel of 2500
Reel of 2000
Reel of 2500
Reel of 2000
ORDERABLE PART NUMBER
SN74LVC257AQDREP
SN74LVC257AQPWREP
SN74LVC257AMDREP
(2)
SN74LVC257AMPWREP
TOP-SIDE MARKING
C257AEP
C257AEP
C257AME
C257AME
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Product Preview
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2007, Texas Instruments Incorporated
SN74LVC257A-EP
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS736B – NOVEMBER 2005 – REVISED JANUARY 2007
www.ti.com
FUNCTION TABLE
INPUTS
OE
H
L
L
L
L
A/B
X
L
L
H
H
A
X
L
H
X
X
B
X
X
X
L
H
OUTPUT
Y
Z
L
H
L
H
LOGIC DIAGRAM (POSITIVE LOGIC)
OE
15
A/B
1
1A
2
4
3
1Y
1B
2A
5
7
6
2Y
2B
3A
11
9
10
3Y
3B
4A
14
12
13
4Y
4B
2
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SN74LVC257A-EP
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS736B – NOVEMBER 2005 – REVISED JANUARY 2007
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply voltage range
Input voltage range
(2)
Output voltage range
(2) (3)
Input clamp current
Output clamp current
Continuous output current
Continuous current through V
CC
or GND
θ
JA
T
stg
(1)
(2)
(3)
(4)
Package thermal impedance
(4)
Storage temperature range
D package
PW package
–65
V
I
< 0
V
O
< 0
–0.5
–0.5
–0.5
MAX
6.5
6.5
V
CC
+ 0.5
–50
–50
±50
±100
73
108
150
UNIT
V
V
V
mA
mA
mA
mA
°C/W
°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.
he input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
The value of V
CC
is provided in the recommended operating conditions table.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions
(1)
MIN
V
CC
V
IH
V
IL
V
I
V
O
I
OH
I
OL
∆t/∆v
T
A
(1)
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
Q-temp
M-temp
–40
–55
V
CC
= 2.7 V
V
CC
= 3 V
V
CC
= 2.7 V
V
CC
= 3 V
Operating
Data retention only
V
CC
= 2.7 V to 3.6 V
V
CC
= 2.7 V to 3.6 V
0
0
2
1.5
2
0.8
5.5
V
CC
–12
–24
12
24
10
125
125
MAX
3.6
UNIT
V
V
V
V
V
mA
mA
ns/V
°C
All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs,
literature number SCBA004.
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SN74LVC257A-EP
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS736B – NOVEMBER 2005 – REVISED JANUARY 2007
www.ti.com
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
I
OH
= –100
µA
V
OH
I
OH
= –12 mA
I
OH
= –24 mA
I
OL
= 100
µA
V
OL
I
I
I
OZ
I
CC
∆I
CC
C
I
C
o
(1)
I
OL
= 12 mA
I
OL
= 24 mA
V
I
= 5.5 V or GND
V
O
= V
CC
or GND
V
I
= V
CC
or GND,
V
I
= V
CC
or GND
V
O
= V
CC
or GND
I
O
= 0
One input at V
CC
– 0.6 V, Other inputs at V
CC
or GND
TEST CONDITIONS
V
CC
2.7 V to 3.6 V
2.7 V
3V
3V
2.7 V to 3.6 V
2.7 V
3V
3.6 V
3.6 V
3.6 V
2.7 V to 3.6 V
3.3 V
3.3 V
5
5
MIN TYP
(1)
V
CC
– 0.2
2.2
2.4
2.2
0.2
0.4
0.55
±5
±15
10
500
µA
µA
µA
µA
pF
pF
V
V
MAX
UNIT
All typical values are at V
CC
= 3.3 V, T
A
= 25°C.
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see
Figure 1)
PARAMETER
FROM
(INPUT)
A or B
A/B
OE
OE
TO
(OUTPUT)
Y
Y
Y
V
CC
= 2.7 V
MIN
MAX
5.4
7.5
6.7
4.7
V
CC
= 3.3 V
±
0.3 V
MIN
1
1
1
0.5
MAX
4.6
6.4
5.6
4.3
1
ns
ns
ns
ns
UNIT
t
pd
t
en
t
dis
t
sk(o)
Operating Characteristics
T
A
= 25°C
PARAMETER
C
pd
Power dissipation capacitance
TEST CONDITIONS
f = 10 MHz
V
CC
= 2.5 V
TYP
14.5
V
CC
= 3.3 V
TYP
15.5
UNIT
pF
4
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SN74LVC257A-EP
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS736B – NOVEMBER 2005 – REVISED JANUARY 2007
PARAMETER MEASUREMENT INFORMATION
V
LOAD
From Output
Under Test
C
L
(see Note A)
R
L
S1
Open
GND
R
L
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
V
LOAD
GND
LOAD CIRCUIT
INPUTS
V
CC
2.7 V
3.3 V
±
0.3 V
V
I
2.7 V
2.7 V
t
r
/t
f
≤2.5
ns
≤2.5
ns
V
M
1.5 V
1.5 V
V
LOAD
6V
6V
C
L
50 pF
50 pF
R
L
500
Ω
500
Ω
V
∆
0.3 V
0.3 V
V
I
Timing Input
t
w
V
I
Input
V
M
V
M
0V
VOLTAGE WAVEFORMS
PULSE DURATION
V
I
Input
t
PLH
Output
t
PHL
V
M
V
M
V
M
V
M
0V
t
PHL
V
OH
V
M
V
OL
t
PLH
V
OH
Output
V
M
V
OL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Waveform 2
S1 at GND
(see Note B)
Output
Control
t
PZL
Output
Waveform 1
S1 at V
LOAD
(see Note B)
t
PZH
V
M
V
M
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
V
I
V
M
V
M
0V
t
PLZ
V
LOAD
/2
V
OL
+ V
∆
t
PHZ
V
OH
− V
∆
V
OH
≈0
V
V
OL
Data Input
t
su
V
M
t
h
V
I
V
M
0V
V
M
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
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
≤
10 MHz, Z
O
= 50
Ω.
D. The outputs are measured one at a time, with one transition per measurement.
E. t
PLZ
and t
PHZ
are the same as t
dis
.
F. t
PZL
and t
PZH
are the same as t
en
.
G. t
PLH
and t
PHL
are the same as t
pd
.
H. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
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