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Электронный компонент: 74VHC126TTR

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1/9
July 2001
s
HIGH SPEED: t
PD
= 3.8ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 4
A (MAX.) at T
A
=25C
s
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
s
POWER DOWN PROTECTION ON INPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 8 mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 5.5V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 126
s
IMPROVED LATCH-UP IMMUNITY
s
LOW NOISE: V
OLP
= 0.8V (MAX.)
DESCRIPTION
The 74VHC126 is an advanced high-speed
CMOS QUAD BUS BUFFERs fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology.
The device requires the 3-STATE control input G
to be set low to place the output go in to the high
impedance state.
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.
74VHC126
QUAD BUS BUFFERS (3-STATE)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
SOP
74VHC126M
74VHC126MTR
TSSOP
74VHC126TTR
TSSOP
SOP
74VHC126
2/9
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X :Don`t Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
RECOMMENDED OPERATING CONDITIONS
1) V
IN
from 30% to 70% of V
CC
PIN No
SYMBOL
NAME AND FUNCTION
1, 4, 10, 13
1G to 4G
Output Enable Inputs
2, 5, 9, 12
1A to 4A
Data Inputs
3, 6, 8, 11
1Y to 4Y
Data Outputs
7
GND
Ground (0V)
14
V
CC
Positive Supply Voltage
A
G
Y
X
L
Z
L
H
L
H
H
H
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage
-0.5 to +7.0
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 Current
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 5.5
V
V
I
Input Voltage
0 to 5.5
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 1) (V
CC
= 3.3
0.3V)
(V
CC
= 5.0
0.5V)
0 to 100
0 to 20
ns/V
74VHC126
3/9
DC SPECIFICATIONS
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
= 3ns)
(*) Voltage range is 3.3V
0.3V
(**) Voltage range is 5.0V
0.5V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
3.0 to
5.5
0.7V
CC
0.7V
CC
0.7V
CC
V
IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
V
3.0 to
5.5
0.3V
CC
0.3V
CC
0.3V
CC
V
OH
High Level Output
Voltage
2.0
I
O
=-50
A
1.9
2.0
1.9
1.9
V
3.0
I
O
=-50
A
2.9
3.0
2.9
2.9
4.5
I
O
=-50
A
4.4
4.5
4.4
4.4
3.0
I
O
=-4 mA
2.58
2.48
2.4
4.5
I
O
=-8 mA
3.94
3.8
3.7
V
OL
Low Level Output
Voltage
2.0
I
O
=50
A
0.0
0.1
0.1
0.1
V
3.0
I
O
=50
A
0.0
0.1
0.1
0.1
4.5
I
O
=50
A
0.0
0.1
0.1
0.1
3.0
I
O
=4 mA
0.36
0.44
0.55
4.5
I
O
=8 mA
0.36
0.44
0.55
I
OZ
High Impedance
Output Leakage
Current
5.5
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
0.25
2.5
2.5
A
I
I
Input Leakage
Current
0 to
5.5
V
I
= 5.5V or GND
0.1
1
1
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
4
40
40
A
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
3.3
(*)
15
5.6
8.0
1.0
9.5
1.0
9.5
ns
3.3
(*)
50
8.1
11.5
1.0
13.0
1.0
13.0
5.0
(**)
15
3.8
5.5
1.0
6.5
1.0
6.5
5.0
(**)
50
5.3
7.5
1.0
8.5
1.0
8.5
t
PLZ
t
PHZ
Output Disable
Time
3.3
(*)
15
R
L
= 1 K
5.4
8.0
1.0
9.5
1.0
9.5
ns
3.3
(*)
50
R
L
= 1 K
7.9
11.5
1.0
13.0
1.0
13.0
5.0
(**)
15
R
L
= 1 K
3.6
5.1
1.0
6.0
1.0
6.0
5.0
(**)
50
R
L
= 1 K
5.1
7.1
1.0
8.0
1.0
8.0
t
PZL
t
PZH
Output Enable
Time
3.3
(*)
50
R
L
= 1 K
9.5
13.2
1.0
15.0
1.0
15.0
ns
5.0
(**)
50
R
L
= 1 K
6.1
8.8
1.0
10.0
1.0
10.0
74VHC126
4/9
CAPACITIVE CHARACTERISTICS
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 circuit)
DYNAMIC SWITCHING CHARACTERISTICS
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.
Symbol
Parameter
Test Condition
Value
Unit
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
6
10
10
10
pF
C
OUT
Output
Capacitance
8
pF
C
PD
Power Dissipation
Capacitance
(note 1)
17
pF
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
OLP
Dynamic Low
Voltage Quiet
Output (note 1, 2)
5.0
C
L
= 50 pF
0.3
0.8
V
V
OLV
-0.8
-0.3
V
IHD
Dynamic High
Voltage Input
(note 1, 3)
5.0
3.5
V
V
ILD
Dynamic Low
Voltage Input
(note 1, 3)
5.0
1.5
V
74VHC126
5/9
TEST CIRCUIT
C
L
=15/50pF or equivalent (includes jig and probe capacitance)
R
L
= R1 = 1K
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
TEST
SWITCH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
V
CC
t
PZH
, t
PHZ
GND