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PDF ( 数据手册 , 数据表 ) M74HC257

零件编号 M74HC257
描述 QUAD 2 CHANNEL MULTIPLEXER
制造商 ST Microelectronics
LOGO ST Microelectronics LOGO 


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M74HC257 数据手册, 描述, 功能
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







M74HC257 pdf, 数据表
M74HC257
Plastic DIP-16 (0.25) MECHANICAL DATA
DIM.
MIN.
mm.
TYP
MAX.
MIN.
inch
TYP.
MAX.
a1 0.51
0.020
B 0.77
1.65 0.030
0.065
b 0.5
0.020
b1 0.25
0.010
t(s)D 20 0.787
cE 8.5
0.335
rodue 2.54
0.100
Pe3 17.78
0.700
teF 7.1 0.280
oleI 5.1 0.201
bsL 3.3
0.130
Obsolete Product(s) - OZ 1.27 0.050
P001C
8/11














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