SN54AHC126, SN74AHC126
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS257L DECEMBER 1995 REVISED JULY 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Operating Range 2-V to 5.5-V V
CC
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
description/ordering information
The 'AHC126 devices are quadruple bus buffer
gates featuring independent line drivers with
3-state outputs. Each output is disabled when the
associated output-enable (OE) input is low. When
OE is high, the respective gate passes the data
from the A input to its Y output.
To ensure the high-impedance state during power
up or power down, OE should be tied to GND
through a pulldown resistor; the minimum value of
the resistor is determined by the current-sourcing
capability of the driver.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP N
Tube
SN74AHC126N
SN74AHC126N
SOIC D
Tube
SN74AHC126D
AHC126
SOIC D
Tape and reel
SN74AHC126DR
AHC126
40
C to 85
C
SOP NS
Tape and reel
SN74AHC126NSR
AHC126
40
C to 85
C
SSOP DB
Tape and reel
SN74AHC126DBR
HA126
TSSOP
PW
Tube
SN74AHC126PW
HA126
TSSOP PW
Tape and reel
SN74AHC126PWR
HA126
TVSOP DGV
Tape and reel
SN74AHC126DGVR
HA126
CDIP J
Tube
SNJ54AHC126J
SNJ54AHC126J
55
C to 125
C
CFP W
Tube
SNJ54AHC126W
SNJ54AHC126W
LCCC FK
Tube
SNJ54AHC126FK
SNJ54AHC126FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Copyright
2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SN54AHC126 . . . J OR W PACKAGE
SN74AHC126 . . . D, DB, DGV, N, NS, OR PW PACKAGE
(TOP VIEW)
SN54AHC126 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1OE
1A
1Y
2OE
2A
2Y
GND
V
CC
4OE
4A
4Y
3OE
3A
3Y
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
4A
NC
4Y
NC
3OE
1Y
NC
2OE
NC
2A
1A
1OE
NC
3Y
3A
V
4OE
2Y
GND
NC
CC
NC No internal connection
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54AHC126, SN74AHC126
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS257L DECEMBER 1995 REVISED JULY 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
OE
A
Y
H
H
H
H
L
L
L
X
Z
logic diagram (positive logic)
1
1OE
2
1A
1Y
3
4
2OE
5
2A
2Y
6
10
3OE
9
3A
3Y
8
13
4OE
12
4A
4Y
11
Pin numbers shown are for the D, DB, DGV, J, N, NS, PW, and W packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
25 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): D package
86
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DB package
96
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGV package
127
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
80
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
76
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
113
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SN54AHC126, SN74AHC126
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS257L DECEMBER 1995 REVISED JULY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54AHC126
SN74AHC126
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
2
5.5
2
5.5
V
VCC = 2 V
1.5
1.5
VIH
High-level input voltage
VCC = 3 V
2.1
2.1
V
VCC = 5.5 V
3.85
3.85
VCC = 2 V
0.5
0.5
VIL
Low-level input voltage
VCC = 3 V
0.9
0.9
V
VCC = 5.5 V
1.65
1.65
VI
Input voltage
0
5.5
0
5.5
V
VO
Output voltage
0
VCC
0
VCC
V
VCC = 2 V
50
50
m
A
IOH
High-level output current
VCC = 3.3 V
0.3 V
4
4
mA
VCC = 5 V
0.5 V
8
8
mA
VCC = 2 V
50
50
m
A
IOL
Low-level output current
VCC = 3.3 V
0.3 V
4
4
mA
VCC = 5 V
0.5 V
8
8
mA
t/
v
Input transition rise or fall rate
VCC = 3.3 V
0.3 V
100
100
ns/V
t/
v
Input transition rise or fall rate
VCC = 5 V
0.5 V
20
20
ns/V
TA
Operating free-air temperature
55
125
40
85
C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
SN54AHC126
SN74AHC126
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
2 V
1.9
2
1.9
1.9
IOH = 50
m
A
3 V
2.9
3
2.9
2.9
VOH
4.5 V
4.4
4.5
4.4
4.4
V
OH
IOH = 4 mA
3 V
2.58
2.48
2.48
IOH = 8 mA
4.5 V
3.94
3.8
3.8
2 V
0.1
0.1
0.1
IOL = 50
m
A
3 V
0.1
0.1
0.1
VOL
4.5 V
0.1
0.1
0.1
V
OL
IOL = 4 mA
3 V
0.36
0.5
0.44
IOL = 8 mA
4.5 V
0.36
0.5
0.44
II
VI = 5.5 V or GND
0 V to 5.5 V
0.1
1*
1
m
A
IOZ
VO = VCC or GND
5.5 V
0.25
2.5
2.5
m
A
ICC
VI = VCC or GND,
IO = 0
5.5 V
4
40
40
m
A
Ci
VI = VCC or GND
5 V
4
10
10
pF
* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.
SN54AHC126, SN74AHC126
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS257L DECEMBER 1995 REVISED JULY 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V
0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
LOAD
TA = 25
C
SN54AHC126
SN74AHC126
UNIT
PARAMETER
(INPUT)
(OUTPUT)
CAPACITANCE
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
A
Y
CL = 15 pF
5.6*
8*
1*
9.5*
1
9.5
ns
tPHL
A
Y
CL = 15 pF
5.6*
8*
1*
9.5*
1
9.5
ns
tPZH
OE
Y
CL = 15 pF
5.4*
8*
1*
9.5*
1
9.5
ns
tPZL
OE
Y
CL = 15 pF
5.4*
8*
1*
9.5*
1
9.5
ns
tPHZ
OE
Y
CL = 15 pF
7*
9.7*
1*
11.5*
1
11.5
ns
tPLZ
OE
Y
CL = 15 pF
7*
9.7*
1*
11.5*
1
11.5
ns
tPLH
A
Y
CL = 50 pF
8.1
11.5
1
13
1
13
ns
tPHL
A
Y
CL = 50 pF
8.1
11.5
1
13
1
13
ns
tPZH
OE
Y
CL = 50 pF
7.9
11.5
1
13
1
13
ns
tPZL
OE
Y
CL = 50 pF
7.9
11.5
1
13
1
13
ns
tPHZ
OE
Y
CL = 50 pF
9.5
13.2
1
15
1
15
ns
tPLZ
OE
Y
CL = 50 pF
9.5
13.2
1
15
1
15
ns
tsk(o)
CL = 50 pF
1.5**
1.5
ns
On products compliant to MIL-PRF-38535, this parameter is not production tested.
On products compliant to MIL-PRF-38535, this parameter does not apply.
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
LOAD
TA = 25
C
SN54AHC126
SN74AHC126
UNIT
PARAMETER
(INPUT)
(OUTPUT)
CAPACITANCE
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
A
Y
CL = 15 pF
3.8*
5.5*
1*
6.5*
1
6.5
ns
tPHL
A
Y
CL = 15 pF
3.8*
5.5*
1*
6.5*
1
6.5
ns
tPZH
OE
Y
CL = 15 pF
3.6*
5.1*
1*
6*
1
6
ns
tPZL
OE
Y
CL = 15 pF
3.6*
5.1*
1*
6*
1
6
ns
tPHZ
OE
Y
CL = 15 pF
4.6*
6.8*
1*
8*
1
8
ns
tPLZ
OE
Y
CL = 15 pF
4.6*
6.8*
1*
8*
1
8
ns
tPLH
A
Y
CL = 50 pF
5.3
7.5
1
8.5
1
8.5
ns
tPHL
A
Y
CL = 50 pF
5.3
7.5
1
8.5
1
8.5
ns
tPZH
OE
Y
CL = 50 pF
5.1
7.1
1
8
1
8
ns
tPZL
OE
Y
CL = 50 pF
5.1
7.1
1
8
1
8
ns
tPHZ
OE
Y
CL = 50 pF
6.1
8.8
1
10
1
10
ns
tPLZ
OE
Y
CL = 50 pF
6.1
8.8
1
10
1
10
ns
tsk(o)
CL = 50 pF
1**
1
ns
On products compliant to MIL-PRF-38535, this parameter is not production tested.
On products compliant to MIL-PRF-38535, this parameter does not apply.
SN54AHC126, SN74AHC126
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS257L DECEMBER 1995 REVISED JULY 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
noise characteristics, V
CC
= 5 V, C
L
= 50 pF, T
A
= 25
C (see Note 4)
PARAMETER
SN74AHC126
UNIT
PARAMETER
MIN
MAX
UNIT
VOL(P)
Quiet output, maximum dynamic VOL
0.8
V
VOL(V)
Quiet output, minimum dynamic VOL
0.8
V
VOH(V)
Quiet output, minimum dynamic VOH
4.4
V
VIH(D)
High-level dynamic input voltage
3.5
V
VIL(D)
Low-level dynamic input voltage
1.5
V
NOTE 4: Characteristics are for surface-mount packages only.
operating characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load,
f = 1 MHz
14
pF
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