TC74LCX257F/FN/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74LCX257F,TC74LCX257FN,TC74LCX257FT,TC74LCX257FK
Low-Voltage Quad 2-Channel Multiplexer (3-state) with 5-V Tolerant Inputs and Outputs
Note:
The TC74LCX257 is a high-performance CMOS multiplexer.
Designed for use in 3.3-V systems, it achieves high-speed
operation while maintaining the CMOS low-power dissipation.
The device is designed for low-voltage (3.3 V) V
CC
applications,
but it could be used to interface to 5-V supply environment for
inputs.
It is composed of four independent 2-channel multiplexers with
common select and
OE
.
If
OE
is set low, the outputs are held in a high-impedance
state. When SELECT is set low, “A” data inputs are enabled.
Conversely, when SELECT is high, “B” data inputs are enabled.
All inputs are equipped with protection circuits against static
discharge.
xxxFN (JEDEC SOP) is not available in
Japan.
TC74LCX257F
TC74LCX257FN
Features
•
•
•
•
•
•
•
Low-voltage operation: V
CC
=
2.0 to 3.6 V
High-speed operation: t
pd
=
6.0 ns (max) (V
CC
=
3.0 to 3.6 V)
Output current: |I
OH
|/I
OL
=
24 mA (min) (V
CC
=
3.0 V)
Latch-up performance:
−500
mA
Available in JEDEC SOP, JEITA SOP, TSSOP and VSSOP(US)
Power-down protection provided on all inputs and outputs
Pin and function compatible with the 74 series
(74AC/VHC/HC/F/ALS/LS etc.) 257 type
TC74LCX257FT
TC74LCX257FK
Weight
SOP16-P-300-1.27A
SOL16-P-150-1.27
TSSOP16-P-0044-0.65A
VSSOP16-P-0030-0.50
: 0.18 g (typ.)
: 0.13 g (typ.)
: 0.06 g (typ.)
: 0.02 g (typ.)
1
2011-03-04
TC74LCX257F/FN/FT/FK
Pin Assignment
(top view)
IEC Logic Symbol
(15)
(1)
(2)
(3)
(5)
(6)
(11)
(10)
(14)
(13)
SELECT
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
SELECT
1A
1B
2A
2B
3A
3B
4A
4B
EN
G1
1
1
MUX
(4)
(7)
(9)
(12)
OE
4A
4B
4Y
3A
3B
3Y
1Y
2Y
3Y
4Y
Truth Table
Inputs
Outputs
OE
H
L
L
L
L
SELECT
X
L
L
H
H
A
X
L
H
X
X
B
X
X
X
L
H
Y
Z
L
H
L
H
X: Don’t care
Z: High impedance
System Diagram
SELECT
1
1A
1B
2A
2B
3A
3B
4A
4B
2
3
5
6
11
10
14
13
12
4Y
9
3Y
7
2Y
4
1Y
OE
15
2
2011-03-04
TC74LCX257F/FN/FT/FK
Absolute Maximum Ratings (Note 1)
Characteristics
Power supply voltage
DC input voltage
Symbol
V
CC
V
IN
V
OUT
I
IK
I
OK
I
OUT
P
D
I
CC
/I
GND
T
stg
Rating
−
0.5 to 7.0
−
0.5 to 7.0
−
0.5 to 7.0 (Note 2)
Unit
V
V
DC output voltage
−
0.5 to V
CC
+
0.5
V
(Note 3)
Input diode current
Output diode current
DC output current
Power dissipation
DC V
CC
/ground current
Storage temperature
−
50
±
50
±
50
mA
(Note 4)
mA
mA
mW
mA
°C
180
±
100
−
65 to 150
Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even
destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even
if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum
ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Note 2: Output in OFF state
Note 3: High or low state. I
OUT
absolute maximum rating must be observed.
Note 4: V
OUT
<
GND, V
OUT
>
V
CC
Operating Ranges (Note 1)
Characteristics
Power supply voltage
Input voltage
Output voltage
Symbol
V
CC
V
IN
V
OUT
Rating
2.0 to 3.6
1.5 to 3.6 (Note 2)
0 to 5.5
0 to 5.5 (Note 3)
0 to V
CC
(Note 4)
±
24
±
12
−
40 to 85
Unit
V
V
V
Output current
Operating temperature
Input rise and fall time
I
OH
/I
OL
T
opr
dt/dv
(Note 5)
(Note 6)
mA
°C
0 to 10
(Note 7)
ns/V
Note 1: The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
Note 2: Data retention only
Note 3: Output in OFF state
Note 4: High or low state
Note 5: V
CC
=
3.0 to 3.6 V
Note 6: V
CC
=
2.7 to 3.0 V
Note 7: V
IN
=
0.8 to 2.0 V, V
CC
=
3.0 V
3
2011-03-04
TC74LCX257F/FN/FT/FK
Electrical Characteristics
DC Characteristics
(Ta
= −40
to 85°C)
Characteristics
H-level
L-level
Symbol
V
IH
V
IL
Test Condition
⎯
⎯
V
CC
(V)
2.7 to 3.6
2.7 to 3.6
Min
2.0
⎯
Max
⎯
Unit
Input voltage
V
0.8
⎯
⎯
⎯
⎯
I
OH
= −
100
μ
A
H-level
V
OH
V
IN
=
V
IH
or V
IL
I
OH
= −
12 mA
I
OH
= −
18 mA
Output voltage
I
OH
= −
24 mA
I
OL
=
100
μ
A
L-level
V
OL
V
IN
=
V
IH
or V
IL
I
OL
=
12 mA
I
OL
=
16 mA
I
OL
=
24 mA
Input leakage current
3-state output OFF state current
Power-off leakage current
Quiescent supply current
Increase in Icc per input
I
IN
I
OZ
I
OFF
I
CC
Δ
I
CC
2.7 to 3.6
2.7
3.0
3.0
2.7 to 3.6
2.7
3.0
3.0
2.7 to 3.6
2.7 to 3.6
0
2.7 to 3.6
2.7 to 3.6
2.7 to 3.6
V
CC
−
0.2
2.2
2.4
2.2
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
V
0.2
0.4
0.4
0.55
±
5.0
±
5.0
μ
A
μ
A
μ
A
V
IN
=
0 to 5.5 V
V
IN
=
V
IH
or V
IL
V
OUT
=
0 to 5.5 V
V
IN
/V
OUT
=
5.5 V
V
IN
=
V
CC
or GND
V
IN
/V
OUT
=
3.6 to 5.5 V
V
IH
=
V
CC
−
0.6 V
10.0
10.0
±
10.0
μ
A
500
AC Characteristics
(Ta
= −40
to 85°C)
Characteristics
Propagation delay time
(A, B-Y)
Propagation delay time
(SELECT-Y)
Output enable time
Symbol
t
pLH
t
pHL
t
pLH
t
pHL
t
pZL
t
pZH
t
pLZ
t
pHZ
t
osLH
t
osHL
Test Condition
V
CC
(V)
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
(Note)
2.7
3.3
±
0.3
Min
⎯
Max
6.5
6.0
8.5
7.0
8.5
7.0
6.0
5.5
⎯
Unit
Figure 1, Figure 2
1.5
⎯
ns
Figure 1, Figure 2
1.5
⎯
ns
Figure 1, Figure 3
1.5
⎯
ns
Output disable time
Figure 1, Figure 3
1.5
⎯
⎯
ns
Output to output skew
1.0
ns
Note:
Parameter guaranteed by design.
(t
osLH
=
|t
pLHm
−
t
pLHn
|, t
osHL
=
|t
pHLm
−
t
pHLn
|)
4
2011-03-04
TC74LCX257F/FN/FT/FK
Dynamic Switching Characteristics
(Ta
=
25°C, input: t
r
=
t
f
=
2.5 ns, C
L
=
50 pF, R
L
=
500
Ω)
Characteristics
Quiet output maximum
dynamic V
OL
Quiet output minimum
dynamic V
OL
Symbol
V
OLP
|V
OLV
|
Test Condition
V
CC
(V)
V
IH
=
3.3 V, V
IL
=
0 V
V
IH
=
3.3 V, V
IL
=
0 V
3.3
3.3
Typ.
0.8
0.8
Unit
V
V
Capacitive Characteristics
(Ta
=
25°C)
Characteristics
Input capacitance
Output capacitance
Power dissipation capacitance
Symbol
C
IN
C
OUT
C
PD
f
IN
=
10 MHz
Test Condition
V
CC
(V)
⎯
⎯
Typ.
7
8
25
Unit
pF
pF
pF
3.3
3.3
(Note)
3.3
Note:
C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr)
=
C
PD
½V
CC
½f
IN
+
I
CC
AC Test Circuit
Open
6.0 V
GND
Measure
C
L
R
L
Switch
R
L
Parameter
t
pLH
, t
pHL
t
pLZ
, t
pZL
t
pHZ
, t
pZH
Switch
Open
6.0 V
GND
Output
C
L
=
50 pF
R
L
=
500
Ω
Figure 1
AC Waveform
t
r
2.5 ns
Input
t
f
2.5 ns
90%
1.5 V
10%
2.7 V
GND
V
OH
1.5 V
t
pLH
Inverting
Output
t
pHL
t
pHL
V
OL
V
OH
1.5 V
t
pLH
V
OL
Non-Inverting
Output
Figure 2
t
pLH
, t
pHL
5
2011-03-04
_pdf/pg_0001.png)
京公网安备 11010802033920号
EEWORLD_pdf/1.png)
_pdf/2.png)
_pdf/3.png)
_pdf/4.png)
_pdf/5.png)
_pdf/pg_0002.png)
_pdf/pg_0003.png)
_pdf/pg_0004.png)
_pdf/pg_0005.png)
