M54/M74HCT257
M54/M74HCT258
February 1993
HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)
HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
B1R
(Plastic Package)
ORDER CODES :
M54HCTXXXF1R
M74HCTXXXM1R
M74HCTXXXB1R
M74HCTXXXC1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
.
HIGH SPEED
t
PD
= 16 ns (TYP.) at V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
µ
A (MAX.) at T
A
= 25
°
C
.
COMPATIBLE WITH TTL 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.)
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS257/258
DESCRIPTION
The M54/74HCT257 and the M54/74HCT258 are
high speed CMOS MULTIPLEXERs fabricated 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-
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 HSC
2
MOS systems with TTL and
NMOS components. They are also plug in replace-
HCT257
HCT258
1/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT
CHIP CARRIER
NC = No Internal Connection
HCT257
HCT258
PIN DESCRIPTION (HCT257)
PIN No
SYMBOL
NAME AND FUNCTION
1
SELECT
Common Data Select
Input
2, 5, 14, 11
1A to 4A
Data Input From Source A
3, 6, 13, 10
1B to 4B
Data Inputs from Source B
4, 7, 12, 9
1Y to 4Y
3 State Multiplexer
Outputs
15
OE
3 State Output Enable
Inputs (Active LOW)
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
PIN DESCRIPTION (HCT258)
PIN No
SYMBOL
NAME AND FUNCTION
1
SELECT
Common Data Select
Input
2, 5, 14, 11
1A to 4A
Data Input From Source A
3, 6, 13, 10
1B to 4B
Data Inputs from Source B
4, 7, 12, 9
1Y to 4Y
3 State Multiplexer
Outputs
15
OE
3 State Output Enable
Inputs (Active LOW)
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
M54/M74HCT257/258
2/12
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
±
20
mA
I
OK
DC Output Diode Current
±
20
mA
I
O
DC Output Source Sink Current Per Output Pin
±
35
mA
I
CC
or I
GND
DC V
CC
or Ground Current
±
70
mA
P
D
Power Dissipation
500 (*)
mW
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
4.5 to 5.5
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
, t
f
Input Rise and Fall Time (V
CC
= 4.5 to 5.5V)
0 to 500
ns
M54/M74HCT257/258
4/12
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