TC74HC251AP_07 [TOSHIBA]
8-Channel Multiplexer (3-state); 8通道多路复用器（三态）
| 型号： | TC74HC251AP_07 |
| 厂家： | 
TOSHIBA |
| 描述： | 8-Channel Multiplexer (3-state) |
| 文件： | 总9页 (文件大小：309K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC74HC251AP/AF
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74HC251AP,TC74HC251AF
8-Channel Multiplexer (3-state)
The TC74HC251A is a high speed CMOS 8-CHANNEL
MULTIPLEXER fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
One of eight date input signals (D0-D7) is selected by decoding
of the address input (A, B, C). The selected data appears on two
outputs; non-inverting (Y) and inverting (W). When the strobe
input is held high, both outputs are in the high-impedance state.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
TC74HC251AP
TC74HC251AF
Features
•
•
•
•
•
•
•
•
High speed: t = 15 ns (typ.) at V
= 5 V
pd
CC
Low power dissipation: I
= 4 μA (max) at Ta = 25°C
CC
High noise immunity: V
= V
= 28% V
(min)
NIH
NIL
CC
Output drive capability: 10 LSTTL loads
Symmetrical output impedance: |I | = I
= 4 mA (min)
OL
OH
∼
−
Balanced propagation delays: t
t
pHL
pLH
Wide operating voltage range: V
(opr) = 2~6 V
CC
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
Pin and function compatible with 74LS251
: 1.00 g (typ.)
: 0.18 g (typ.)
Pin Assignment
1
2007-10-01
TC74HC251AP/AF
IEC Logic Symbol
Truth Table
Inputs
Select
Outputs
Strobe
Y
W
C
X
L
B
X
L
A
X
L
ST
H
L
Z
Z
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
L
L
H
L
L
L
H
H
L
L
L
H
L
L
H
H
H
H
L
L
H
L
L
H
H
L
H
L
X: Don’t care
H: High impedance
2
2007-10-01
TC74HC251AP/AF
System Diagram
3
2007-10-01
TC74HC251AP/AF
Absolute Maximum Ratings (Note 1)
Characteristics
Supply voltage range
Symbol
Rating
Unit
V
−0.5~7
V
V
CC
DC input voltage
V
−0.5~V
+ 0.5
IN
CC
CC
DC output voltage
Input diode current
Output diode current
DC output current
V
−0.5~V
+ 0.5
V
OUT
I
±20
±20
±25
±50
mA
mA
mA
mA
mW
°C
IK
I
OK
I
OUT
DC V /ground current
CC
I
CC
Power dissipation
P
500 (DIP) (Note 2)/180 (SOP)
D
Storage temperature
T
stg
−65~150
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: 500 mW in the range of Ta = −40~65°C. From Ta = 65 to 85°C a derating factor of −10 mW/°C shall be
applied until 300 mW.
Operating Ranges (Note)
Characteristics
Supply voltage
Symbol
Rating
2~6
Unit
V
V
V
CC
Input voltage
V
0~V
0~V
IN
CC
CC
Output voltage
V
V
OUT
Operating temperature
T
opr
−40~85
°C
0~1000 (V
= 2.0 V)
CC
CC
CC
Input rise and fall time
t , t
0~500 (V
0~400 (V
= 4.5 V)
= 6.0 V)
ns
r
f
Note:
The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
4
2007-10-01
TC74HC251AP/AF
Electrical Characteristics
DC Characteristics
Test Condition
Ta = 25°C
Ta = −40~85°C
Characteristics
Symbol
Unit
V
(V)
CC
Min
Typ.
Max
Min
Max
2.0
1.50
3.15
4.20
⎯
⎯
⎯
⎯
⎯
1.50
3.15
4.20
⎯
⎯
⎯
High-level input
voltage
V
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
V
V
⎯
⎯
IH
⎯
⎯
⎯
⎯
0.50
1.35
1.80
⎯
0.50
1.35
1.80
⎯
Low-level input
voltage
V
⎯
⎯
⎯
IL
⎯
⎯
⎯
1.9
4.4
5.9
4.18
5.68
⎯
2.0
4.5
6.0
4.31
5.80
0.0
0.0
0.0
0.17
0.18
1.9
4.4
5.9
4.13
5.63
⎯
I
= −20 μA
⎯
⎯
OH
V
IN
= V or
IL
High-level output
voltage
V
⎯
⎯
V
OH
IH
V
I
I
= −4 mA
⎯
⎯
OH
= −5.2 mA
⎯
⎯
OH
0.1
0.1
0.1
0.26
0.26
0.1
0.1
0.1
0.33
0.33
I
= 20 μA
⎯
⎯
OL
V
IN
Low-level output
voltage
V
= V or
IL
⎯
⎯
V
OL
IH
V
I
I
= 4 mA
⎯
⎯
OL
= 5.2 mA
⎯
⎯
OL
V
V
= V or V
IH
IN
IL
3-state off leak
current
I
6.0
⎯
⎯
±0.5
⎯
±5.0
μA
OZ
= V
or GND
CC
OUT
Input leakage
current
I
V
V
= V
or GND
6.0
6.0
⎯
⎯
⎯
⎯
±0.1
⎯
⎯
±1.0
μA
μA
IN
IN
IN
CC
CC
Quiescent supply
current
I
= V
or GND
4.0
40.0
CC
AC Characteristics (C = 15 pF, V = 5 V, Ta = 25°C, input: t = t = 6 ns)
L
CC
r
f
Characteristics
Symbol
Test Condition
Min
Typ.
4
Max
8
Unit
ns
t
t
TLH
Output transition time
⎯
⎯
⎯
⎯
⎯
⎯
⎯
THL
Propagation delay time
(D-Y)
t
t
t
t
t
t
t
t
pLH
pHL
pLH
pHL
pLH
pHL
pLH
pHL
⎯
⎯
⎯
⎯
⎯
14
15
19
19
10
24
24
31
31
18
ns
ns
ns
ns
ns
Propagation delay time
(D-W)
Propagation delay time
(A, B, C-Y)
Propagation delay time
(A, B, C-W)
t
pZL
3-state output enable time
t
pZH
5
2007-10-01
TC74HC251AP/AF
AC Characteristics (C = 50 pF, input: t = t = 6 ns)
L
r
f
Test Condition
Ta = 25°C
Ta = −40~85°C
Characteristics
Symbol
Unit
V
(V)
CC
Min
Typ.
Max
Min
Max
2.0
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
30
8
75
15
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
95
19
t
t
TLH
Output transition time
⎯
⎯
⎯
⎯
⎯
⎯
⎯
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
ns
ns
ns
ns
ns
ns
ns
THL
7
13
16
65
17
14
70
18
15
80
23
19
80
23
19
40
13
10
25
13
11
5
140
28
175
35
Propagation delay
time
t
t
pLH
pHL
(D-Y)
24
30
140
28
175
35
Propagation delay
time
t
t
pLH
pHL
(D-W)
24
30
180
36
225
45
Propagation delay
time
t
t
pLH
pHL
(A, B, C-Y)
31
38
180
36
225
45
Propagation delay
time
t
t
pLH
pHL
(A, B, C-W)
31
38
105
21
130
26
t
pZL
3-state output enable
time
t
pZH
19
22
105
21
130
26
t
pLZ
3-state output disable
time
t
pHZ
19
22
Input capacitance
C
⎯
⎯
10
10
pF
pF
IN
C
PD
Power dissipation
capacitance
⎯
69
⎯
⎯
⎯
(Note)
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
(opr) = C ･V ･f + I
PD CC IN CC
CC
6
2007-10-01
TC74HC251AP/AF
Package Dimensions
Weight: 1.00 g (typ.)
7
2007-10-01
TC74HC251AP/AF
Package Dimensions
Weight: 0.18 g (typ.)
8
2007-10-01
TC74HC251AP/AF
RESTRICTIONS ON PRODUCT USE
20070701-EN GENERAL
• The information contained herein is subject to change without notice.
• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc.
• The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his
document shall be made at the customer’s own risk.
• The products described in this document shall not be used or embedded to any downstream products of which
manufacture, use and/or sale are prohibited under any applicable laws and regulations.
• The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which
may result from its use. No license is granted by implication or otherwise under any patents or other rights of
TOSHIBA or the third parties.
• Please contact your sales representative for product-by-product details in this document regarding RoHS
compatibility. Please use these products in this document in compliance with all applicable laws and regulations
that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses
occurring as a result of noncompliance with applicable laws and regulations.
9
2007-10-01
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