74VHC157
QUAD 2 CHANNEL MULTIPLEXER
s
s
s
s
s
s
s
s
s
s
HIGH SPEED: t
PD
= 4.1 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION:
I
CC
= 4
µA
(MAX.) at T
A
=25°C
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
POWER DOWN PROTECTION ON INPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 8 mA (MIN)
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
IMPROVED LATCH-UP IMMUNITY
LOW NOISE: V
OLP
= 0.8V (MAX.)
SOP
TSSOP
Table 1: Order Codes
PACKAGE
SOP
TSSOP
DESCRIPTION
The 74VHC157 is an advanced high-speed
CMOS QUAD 2-CHANNEL MULTIPLEXER
fabricated with sub-micron silicon gate and
double-layer metal wiring C
2
MOS technology.
It consists of four 2-input digital multiplexer with
common select and strobe inputs. It is a
non-inverting multiplexer. When the STROBE
Figure 1: Pin Connection And IEC Logic Symbols
O
et
l
so
b
ro
P
e
uc
d
s)
t(
input is held high selection of data is inhibited and
all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their corresponding Y outputs.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage. This device can be
used to interface 5V to 3V. All inputs and outputs
are equipped with protection circuits against static
discharge, giving them 2KV ESD immunity and
transient excess voltage.
O
-
so
b
te
le
ro
P
uc
d
s)
t(
T&R
74VHC157MTR
74VHC157TTR
November 2004
Rev. 4
1/12
74VHC157
Table 4: Absolute Maximum Ratings
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
- 20
±
20
±
25
±
50
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
Table 5: Recommended Operating Conditions
Symbol
V
CC
V
I
V
O
T
op
dt/dv
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time (note 1) (V
CC
= 3.3
±
0.3V)
(V
CC
= 5.0
±
0.5V)
Parameter
1) V
IN
from 30% to 70% of V
CC
O
et
l
so
b
ro
P
e
uc
d
s)
t(
O
-
s
b
te
le
o
Value
2 to 5.5
0 to 5.5
ro
P
uc
d
s)
t(
Unit
V
V
V
°C
ns/V
0 to V
CC
0 to 100
0 to 20
-55 to 125
3/12
74VHC157
Table 6: DC Specifications
Test Condition
Symbol
Parameter
V
CC
(V)
2.0
3.0 to
5.5
2.0
3.0 to
5.5
2.0
3.0
4.5
3.0
4.5
V
OL
Low Level Output
Voltage
2.0
3.0
4.5
3.0
4.5
I
I
I
CC
Input Leakage
Current
Quiescent Supply
Current
0 to
5.5
5.5
I
O
=-50
µA
I
O
=-50
µA
I
O
=-50
µA
I
O
=-4 mA
I
O
=-8 mA
I
O
=50
µA
I
O
=50
µA
I
O
=50
µA
I
O
=4 mA
I
O
=8 mA
V
I
= 5.5V or GND
V
I
= V
CC
or GND
T
A
= 25°C
Min.
1.5
0.7V
CC
0.5
0.3V
CC
1.9
2.9
4.4
2.58
3.94
0.0
0.0
0.0
0.1
0.1
0.1
2.0
3.0
4.5
1.9
2.9
4.4
2.48
3.8
Typ.
Max.
Value
-40 to 85°C
Min.
1.5
0.7V
CC
0.5
0.3V
CC
1.9
2.9
4.4
Max.
-55 to 125°C
Min.
1.5
0.7V
CC
0.5
0.3V
CC
V
V
Max.
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
V
IL
V
OH
Table 7: AC Electrical Characteristics
(Input t
r
= t
f
= 3ns)
Symbol
Parameter
t
PLH
t
PHL
t
PLH
t
PHL
O
et
l
so
b
Propagation Delay
Time
A, B to Y
ro
P
e
V
CC
(V)
3.3
(*)
3.3
(*)
5.0
(**)
5.0
(**)
3.3
(*)
3.3
(*)
5.0
(**)
5.0
(**)
Test Condition
C
L
(pF)
15
50
15
50
15
50
15
50
15
50
15
50
T
A
= 25°C
Min.
Typ.
6.2
8.7
4.1
5.6
8.4
10.9
5.3
6.8
8.7
11.2
5.6
7.1
Max.
9.7
13.2
6.4
8.4
13.2
16.7
8.1
10.1
13.6
17.1
8.6
10.6
uc
d
)-
(s
t
b
O
so
0.36
0.36
±
0.1
4
te
le
0.1
0.1
0.1
ro
P
2.4
3.7
uc
d
0.1
0.1
0.1
0.55
0.55
±
1
40
s)
t(
V
V
0.44
0.44
±
1
40
µA
µA
Value
-40 to 85°C
Min.
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
11.5
15.0
7.5
9.5
15.5
19.0
9.5
11.5
16.0
19.5
10.0
12.0
-55 to 125°C
Min.
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
11.5
15.0
7.5
9.5
15.5
19.0
9.5
11.5
16.0
19.5
10.0
12.0
ns
ns
ns
Unit
Propagation Delay
Time
SELECT to Y
t
PLH
t
PHL
Propagation Delay 3.3
(*)
Time STROBE to Y
3.3
(*)
5.0
(**)
5.0
(**)
(*) Voltage range is 3.3V
±
0.3V
(**) Voltage range is 5.0V
±
0.5V
4/12
74VHC157
Table 8: Capacitive Characteristics
Test Condition
Symbol
Parameter
T
A
= 25°C
Min.
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance
(note 1)
Typ.
6
18
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
Max.
10
pF
pF
Unit
1) C
PD
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. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/4 (per
channel)
Table 9: Dynamic Switching Characteristics
Test Condition
Symbol
Parameter
V
CC
(V)
5.0
T
A
= 25°C
Min.
Typ.
0.3
-0.8
C
L
= 50 pF
3.5
-0.3
Max.
0.8
Value
-40 to 85°C
Min.
Max.
V
OLP
V
OLV
V
IHD
V
ILD
Dynamic Low
Voltage Quiet
Output (note 1, 2)
Dynamic High
Voltage Input
(note 1, 3)
Dynamic Low
Voltage Input
(note 1, 3)
5.0
5.0
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f=1MHz.
Figure 4: Test Circuit
O
et
l
so
b
ro
P
e
uc
d
s)
t(
O
-
so
b
1.5
te
le
ro
P
Min.
-55 to 125°C
Max.
uc
d
s)
t(
V
Unit
V
V
C
L
=15/50pF or equivalent (includes jig and probe capacitance)
R
T
= Z
OUT
of pulse generator (typically 50Ω)
5/12
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