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參數資料
| 型號： | M54HCT257F1R |
| 廠商： | 意法半導體 |
| 英文描述： | HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE, INVERTING |
| 中文描述： | HCT257四2通道多路3態(tài)HCT258四2通道多路3態(tài)，反相 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 255K |
| 代理商： | M54HCT257F1R |
M54/M74HCT257
M54/M74HCT258
February 1993
HCT258QUAD2CHANNEL MULTIPLEXER(3-STATE,INVERTING)
.
HIGH SPEED
t
PD
= 16 ns(TYP.) at V
CC
= 5 V
.
LOWPOWER DISSIPATION
I
CC
= 4
μ
A(MAX.) at T
A
= 25
°
C
.
COMPATIBLE WITHTTL OUTPUTS
V
IH
= 2V (MIN.) V
IL
= 0.8V (MAX)
.
OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH
= I
OL
= 6 mA(MIN.)
.
BALANCEDPROPAGATION DELAYS
t
PLH
= t
PHL
.
PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS257/258
HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
B1R
(Plastic Package)
ORDER CODES :
M54HCTXXXF1R
M74HCTXXXB1R
M74HCTXXXM1R
M74HCTXXXC1R
F1R
(CeramicPackage)
M1R
(MicroPackage)
C1R
(Chip Carrier)
PIN CONNECTIONS
(top view)
DESCRIPTION
The M54/74HCT257 and the M54/74HCT258 are
highspeed CMOSMULTIPLEXERsfabricated with
silicon gate C
2
MOS technology.
They have the same high speed performance of
LSTTL combined with true CMOS low power con-
sumption.
These IC’s are composed of an independent 2-
channelmultiplexer with commonSELECT and EN-
ABLE INPUT.
The M54/74HCT258 is an inverting multiplexer
while the M54/74HCT257 is a non-inverting multi-
plexer. When the ENABLE INPUT is held ”High”,
outputs of both IC’sbecome high-impedance state.
If SELECTINPUTisheld”Low”,”A” dataisselected,
when SELECT INPUT is high ”H”, ”B” data is
chosen.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
This integrated circuit has input and output charac-
teristics that are fully compatible with 54/74 LSTTL
logic families. M54/74HCT devices are designed to
directly interface HSC
2
MOS systems with TTL and
NMOS components. They are also plugin replace-
HCT257
HCT258
1/12
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