74V1T126
SINGLE BUS BUFFER (3-STATE)
PRELIMINARY DATA
October 1999
s
HIGH SPEED: t
PD
= 3.8 ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 1
A (MAX.) at T
A
= 25
o
C
s
COMPATIBLE WITH TTL OUTPUTS:
V
IH
= 2V (MIN), V
IL
= 0.8V (MAX)
s
POWER DOWN PROTECTION ON INPUT
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) = 4.5V to 5.5V
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74V1T126 is an advanced high-speed
CMOS SINGLE BUS BUFFER fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology.
3-STATE control input G has to be set LOW to
place the output into 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
S
(SOT23-5L)
C
(SC-70)
ORDER CODE:
74V1T126S
74V1T126C
1/8
INPUT EQUIVALENT CIRCUIT
TRUTH TABLE
A
G
Y
X
L
Z
L
H
L
H
H
H
X:"H" or "L" Z:High Impedance
PIN DESCRIPTION
PI N No
SYMBOL
NAME AND FUNCT ION
1
1G
Output Enable Input
2
1A
Data Input
4
1Y
Data Output
3
GND
Ground (0V)
5
V
CC
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Val ue
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
o
C
T
L
Lead Temperature (10 sec)
260
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Valu e
Uni t
V
CC
Supply Voltage
4.5 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
-40 to +85
o
C
dt/dv
Input Rise and Fall Time (see note 1) (V
CC
= 5.0
0.5V)
0 to 20
ns/V
1) V
IN
from 0.8V to 2 V
74V1T126
2/8
DC SPECIFICATIONS
Symb ol
Parameter
T est Cond ition s
Val ue
Un it
V
CC
(V)
T
A
= 25
o
C
-40 to 85
o
C
Min.
Typ .
Max.
Min .
Max.
V
IH
High Level Input
Voltage
4.5 to 5.5
2
2
V
V
IL
Low Level Input
Voltage
4.5 to 5.5
0.8
0.8
V
V
OH
High Level Output
Voltage
4.5
I
O
=-50
A
4.4
4.5
4.4
V
4.5
I
O
=-8 mA
3.94
3.8
V
OL
Low Level Output
Voltage
4.5
I
O
=50
A
0.0
0.1
0.1
V
4.5
I
O
=8 mA
0.36
0.44
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
A
I
I
Input Leakage Current
0 to 5.5
V
I
= 5.5V or GND
0.1
1.0
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
1
10
A
I
CC
Additional Worst Case
Supply Current
5.5
One Input at 3.4V,
other input at V
CC
or
GND
1.35
1.5
mA
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Val ue
Un it
T
A
= 25
o
C
-40 to 85
o
C
Min.
Typ .
Max.
Min .
Max.
C
IN
Input Capacitance
4
10
10
pF
C
OUT
Output Capacitance
10
pF
C
PD
Power Dissipation
Capacitance (note 1)
14
pF
1) C
PD
isdefined as the value of the IC'sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. I
CC
(opr) = C
PD
V
CC
f
IN
+ I
CC
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
=3 ns)
Symb ol
Parameter
Test Co nditi on
Val ue
Un it
V
CC
(*)
(V)
C
L
(pF )
T
A
= 25
o
C
-40 to 85
o
C
Min.
Typ .
Max.
Min .
Max.
t
PLH
t
PHL
Propagation Delay
Time
5.0
15
3.8
5.5
1.0
6.5
ns
5.0
50
5.3
7.5
1.0
8.5
t
PLZ
t
PHZ
Output Disable Time
5.0
15
4.6
6.8
1.0
8.0
ns
5.0
50
6.1
8.8
1.0
10.0
t
PZH
t
PZL
Output Enable Time
5.0
15
3.6
5.1
1.0
6.0
ns
5.0
50
5.1
7.1
1.0
8.0
(*) Voltage range is 5V
0.5V
74V1T126
3/8
TEST CIRCUIT
T EST
SW IT CH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
V
CC
t
PZH
, t
PHZ
GND
C
L
= 15/50 pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 1K
orequivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
74V1T126
4/8
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
74V1T126
5/8
PDF 
ZIP