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PDF M74HC257 Data sheet ( Hoja de datos )
| Número de pieza | M74HC257 | |
| Descripción | QUAD 2 CHANNEL MULTIPLEXER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M74HC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED :
tPD = 11 ns (TYP.) at VCC = 6V
s LOW POWER DISSIPATION:
ICC =4µA(MAX.) at TA=25°C
s HIGH NOISE IMMUNITY:
)VNIH = VNIL = 28 % VCC (MIN.)
t(ss SYMMETRICAL OUTPUT IMPEDANCE:
c|IOH| = IOL = 6mA (MIN)
us BALANCED PROPAGATION DELAYS:
dtPLH ≅ tPHL
ros WIDE OPERATING VOLTAGE RANGE:
PVCC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
te74 SERIES 257
oleDESCRIPTION
sThe M74HC257 is an high speed CMOS QUAD 2
bCHANNEL MULTIPLEXER (3-STATE) fabricated
Owith silicon gate C2MOS technology.
-This IC is composed of an independent 2-channel
t(s)multiplexer with common SELECT and ENABLE
(OE) input.
cThe M74HC257 is a non-inverting multiplexer.
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
TSSOP
M74HC257B1R
M74HC257M1R
T&R
M74HC257RM13TR
M74HC257TTR
When the ENABLE input is held "High", outputs of
the IC become in a High-Impedance state. If
SELECT input is held low, "A" data is selected,
when SELECT is high , "B" data is chosen.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
Obsolete ProduPIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001
1/11
1 page  
M74HC257
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
tTLH tTHL Output Transition
Time
2.0
4.5 50
25 60 75 90
7 12 15 19 ns
6.0 6 10 13 15
tPLH tPHL Propagation Delay 2.0
Time
4.5 50
45 100 125 150
13 20 25 30 ns
(A, B - Y)
uct(s)tPLH tPHL Propagation Delay
Time
rod(SELECT - Y)
lete PtPZL tPZH High Impedance
oOutput Enable
sTime
t(s) - ObtPLZ tPHZ High Impedance
Output Disable
ucTime
6.0
2.0
4.5 150
6.0
2.0
4.5 50
6.0
2.0
4.5 150
6.0
2.0
4.5 50 RL = 1 KΩ
6.0
2.0
4.5 150 RL = 1 KΩ
6.0
2.0
4.5 50 RL = 1 KΩ
6.0
11 17 21 26
62 140 175 210
18 28 35 42 ns
15 24 30 36
45 100 125 150
13 20 25 30 ns
11 17 21 26
62 140 175 210
18 28 35 42 ns
15 24 30 36
40 110 140 165
12 22 28 33 ns
10 19 24 28
57 150 190 225
17 30 38 45 ns
14 26 32 38
28 140 175 210
14 28 35 42 ns
13 24 30 36
rodCAPACITIVE CHARACTERISTICS
olete PSymbol
Parameter
Test Condition
VCC
(V)
ObsCIN Input Capacitance
Value
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
5 10 10 10 pF
COUT
Output
Capacitance
10 pF
CPD Power Dissipation
Capacitance (note
1)
47
pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/4 (per
Channel)
5/11
5 Page 
M74HC257
Obsolete Product(s) - Obsolete Product(s)
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
© The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco
Singapore - Spain - Sweden - Switzerland - United Kingdom
© http://www.st.com
11/11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet M74HC257.PDF ] | |
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