1/8
June 2003
s
HIGH SPEED: t
PD
= 3.8ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 1
A(MAX.) at T
A
= 25C
s
COMPATIBLE WITH TTL OUTPUTS:
V
IH
= 2V (MIN), V
IL
= 0.8V (MAX)
s
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 8mA (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 74V2T126 is an advanced high-speed CMOS
DUAL BUS BUFFER fabricated with sub-micron
silicon gate and double-layer metal wiring C
2
MOS
technology.
3-STATE control input nG has to be set LOW to
place the output into the high impedance state.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 3V to 5V systems
and it is ideal for portable applications like
personal digital assistant, camcorder and all
battery-powered equipment.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them ESD immunity and transient excess voltage.
74V2T126
DUAL BUS BUFFER (3-STATE)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
T & R
SOT23-8L
74V2T126STR
SOT23-8L
74V2T126
2/8
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X: "H" or "L"
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 0.8V to 2V
PIN No
SYMBOL
NAME AND FUNCTION
1, 7
1G, 2G
Output Enable Inputs
2, 5
1A, 2A
Data Inputs
3, 6
2Y, 1Y
Data Outputs
4
GND
Ground (0V)
8
V
CC
Positive Supply Voltage
nA
nG
nY
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)
260
C
Symbol
Parameter
Value
Unit
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
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 1) (V
CC
= 5.0
0.5V)
0 to 20
ns/V
74V2T126
3/8
DC SPECIFICATION
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
= 3ns)
(*) 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
4.5 to
5.5
2.0
2.0
2.0
V
V
IL
Low Level Input
Voltage
4.5 to
5.5
0.8
0.8
0.8
V
V
OH
High Level Output
Voltage
4.5
I
O
=-50
A
4.4
4.5
4.4
4.4
V
4.5
I
O
=-8 mA
3.94
3.8
3.7
V
OL
Low Level Output
Voltage
4.5
I
O
=50
A
0.0
0.1
0.1
0.1
V
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
= 5.5 or GND
0.25
2.5
5
A
I
I
Input Leakage
Current
0 to
5.5
V
I
= 5.5V or GND
0.1
1
1
A
I
OPD
Power down Output
Leakage Current
0
V
O
= 5.5
0.5
5
10
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
1
10
20
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
1.5
mA
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
5.0
(*)
15
3.8
5.5
1.0
6.5
1.0
7.5
ns
5.0
(*)
50
4.3
6.5
1.0
7.5
1.0
8.5
t
PLZ
t
PHZ
Output Disable
Time
5.0
(*)
15
R
L
= 1 K
3.6
5.0
1.0
6.0
1.0
7.0
5.0
(*)
50
R
L
= 1 K
5.1
7.0
1.0
8.0
1.0
9.0
t
PZL
t
PZH
Output Enable
Time
5.0
(*)
15
R
L
= 1 K
3.7
5.9
1.0
7.0
1.0
8.0
5.0
(*)
50
R
L
= 1 K
4.1
6.5
1.0
7.5
1.0
8.5
74V2T126
4/8
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 current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/2
TEST CIRCUIT TEST CIRCUIT
C
L
=15/50pF or equivalent (includes jig and probe capacitance)
R1 = 1K
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
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
4
10
10
10
pF
C
OUT
Output
Capacitance
6
pF
C
PD
Power Dissipation
Capacitance
(note 1)
14
pF
TEST
SWITCH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
V
CC
t
PZH
, t
PHZ
GND
74V2T126
5/8
WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
PDF 
ZIP