STMicroelectronics M74HC257 Quad 2 channel multiplexer (3-state) Datasheet

M74HC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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HIGH SPEED :
tPD = 11 ns (TYP.) at VCC = 6V
LOW POWER DISSIPATION:
ICC =4µA(MAX.) at TA=25°C
HIGH NOISE IMMUNITY:
VNIH = V NIL = 28 % VCC (MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 6mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
DESCRIPTION
The M74HC257 is an high speed CMOS QUAD 2
CHANNEL MULTIPLEXER (3-STATE) fabricated
with silicon gate C2MOS technology.
This IC is composed of an independent 2-channel
multiplexer with common SELECT and ENABLE
(OE) input.
The 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001
1/11
M74HC257
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
1
SELECT
2, 5, 14, 11
3, 6, 13, 10
1A to 4A
1B to 4B
4, 7, 12, 9
1Y to 4Y
15
OE
8
16
GND
Vcc
NAME AND FUNCTION
Common Data Select
Input
Data Input From Source A
Data Input From Source B
3 State Multiplexer
Outputs
3 State Output Enable
Inputs (Active Low)
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
OE
SELECT
A
B
Y
H
L
L
L
L
X
L
L
H
H
X
L
H
X
X
X
X
X
L
H
Z
L
H
L
H
X : Don’t Care
Z : High Impedance
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
2/11
OUTPUT
M74HC257
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Value
Supply Voltage
Unit
-0.5 to +7
V
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
V
DC Input Diode Current
± 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
± 35
mA
± 70
mA
VI
DC Input Voltage
VO
DC Output Voltage
IIK
ICC or IGND DC VCC or Ground Current
PD
Power Dissipation
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
V
500(*)
mW
-65 to +150
°C
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Value
Supply Voltage
Unit
2 to 6
V
VI
Input Voltage
0 to VCC
V
VO
Output Voltage
0 to VCC
V
Top
Operating Temperature
-55 to 125
°C
Input Rise and Fall Time
tr, tf
VCC = 2.0V
0 to 1000
ns
VCC = 4.5V
0 to 500
ns
VCC = 6.0V
0 to 400
ns
3/11
M74HC257
DC SPECIFICATIONS
Test Condition
Symbol
VIH
VIL
VOH
VOL
II
IOZ
ICC
4/11
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
Typ.
Max.
1.5
3.15
4.2
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
1.5
3.15
4.2
0.5
1.35
1.8
V
0.5
1.35
1.8
2.0
IO=-20 µA
1.9
2.0
1.9
1.9
4.5
IO=-20 µA
4.4
4.5
4.4
4.4
6.0
IO=-20 µA
5.9
6.0
5.9
5.9
4.5
IO=-6.0 mA
4.18
4.31
4.13
4.10
5.68
Unit
V
V
6.0
IO=-7.8 mA
2.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=20 µA
0.0
0.1
0.1
0.1
6.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=6.0 mA
0.17
0.26
0.33
0.40
6.0
IO=7.8 mA
0.18
0.26
0.33
0.40
6.0
VI = VCC or GND
± 0.1
±1
±1
µA
6.0
VI = VIH or VIL
VO = VCC or GND
± 0.5
±5
± 10
µA
6.0
VI = VCC or GND
4
40
80
µA
5.8
5.63
5.60
V
M74HC257
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Symbol
Parameter
tTLH tTHL Output Transition
Time
tPLH tPHL Propagation Delay
Time
(A, B - Y)
tPLH tPHL Propagation Delay
Time
(SELECT - Y)
tPZL tPZH High Impedance
Output Enable
Time
tPLZ tPHZ High Impedance
Output Disable
Time
TA = 25°C
VCC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Value
Min.
50
50
150
50
150
50
RL = 1 KΩ
150
RL = 1 KΩ
50
RL = 1 KΩ
Typ.
Max.
25
7
6
45
13
11
62
18
15
45
13
11
62
18
15
40
12
10
57
17
14
28
14
13
60
12
10
100
20
17
140
28
24
100
20
17
140
28
24
110
22
19
150
30
26
140
28
24
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
75
15
13
125
25
21
175
35
30
125
25
21
175
35
30
140
28
24
190
38
32
175
35
30
Unit
Max.
90
19
15
150
30
26
210
42
36
150
30
26
210
42
36
165
33
28
225
45
38
210
42
36
ns
ns
ns
ns
ns
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
CIN
Input Capacitance
COUT
Output
Capacitance
Power Dissipation
Capacitance (note
1)
CPD
VCC
(V)
Value
TA = 25°C
Min.
Typ.
Max.
5
10
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
10
Unit
Max.
10
pF
10
pF
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
M74HC257
TEST CIRCUIT
TEST
tPLH, tPHL
SWITCH
Open
tPZL, tPLZ
VCC
tPZH, tPHZ
GND
CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
6/11
M74HC257
WAVEFORM 2 :OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
7/11
M74HC257
Plastic DIP-16 (0.25) MECHANICAL DATA
mm.
inch
DIM.
MIN.
a1
0.51
B
0.77
TYP
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
P001C
8/11
M74HC257
SO-16 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.003
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45° (typ.)
D
9.8
10
0.385
0.393
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8° (max.)
PO13H
9/11
M74HC257
TSSOP16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0089
D
4.9
5
5.1
0.193
0.197
0.201
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0°
L
0.45
A
0.60
0.0256 BSC
8°
0°
0.75
0.018
8°
0.024
0.030
A2
A1
b
e
K
c
L
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
10/11
M74HC257
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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.
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11/11
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