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STMicroelectronics Electronic Components Datasheet

M74HCT257 Datasheet

HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE / INVERTING

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M54/M74HCT257
M54/M74HCT258
HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)
. HIGH SPEED
tPD = 16 ns (TYP.) at VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) at TA = 25 °C
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX)
. OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH= IOL = 6 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS257/258
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCTXXXF1R M74HCTXXXM1R
M74HCTXXXB1R M74HCTXXXC1R
DESCRIPTION
The M54/74HCT257 and the M54/74HCT258 are
high speed CMOS MULTIPLEXERs fabricated with
silicon gate C2MOS 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-
channel multiplexer with common SELECT 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’s become high-impedance state.
If SELECT INPUT is held ”Low”, ”A” data is selected,
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 HSC2MOS systems with TTL and
NMOS components. They are also plug in replace-
PIN CONNECTIONS (top view)
H CT 2 57
HCT258
February 1993
1/12


STMicroelectronics Electronic Components Datasheet

M74HCT257 Datasheet

HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE / INVERTING

No Preview Available !

M54/M74HCT257/258
INPUT AND OUTPUT EQUIVALENT CIRCUIT
CHIP CARRIER
HCT257
HCT258
NC = No Internal Connection
PIN DESCRIPTION (HCT257)
PIN No
1
SYMBOL
SELECT
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
1A to 4A
1B to 4B
1Y to 4Y
15 OE
8 GND
16 VCC
NAME AND FUNCTION
Common Data Select
Input
Data Input From Source A
Data Inputs from Source B
3 State Multiplexer
Outputs
3 State Output Enable
Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
PIN DESCRIPTION (HCT258)
PIN No
1
SYMBOL
SELECT
2, 5, 14, 11
3, 6, 13, 10
4, 7, 12, 9
1A to 4A
1B to 4B
1Y to 4Y
15 OE
8 GND
16 VCC
NAME AND FUNCTION
Common Data Select
Input
Data Input From Source A
Data Inputs from Source B
3 State Multiplexer
Outputs
3 State Output Enable
Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
2/12


Part Number M74HCT257
Description HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE / INVERTING
Maker ST Microelectronics
Total Page 12 Pages
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