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SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994
•
•
•
•
State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil
DIPs (J, N)
SN54BCT126A . . . J OR W PACKAGE
SN74BCT126A . . . D OR N PACKAGE
(TOP VIEW)
1OE
1A
1Y
2OE
2A
2Y
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
4OE
4A
4Y
3OE
3A
3Y
description
The
′BCT126A
bus buffer features independent
line drivers with 3-state outputs. Each output is
disabled when the associated output-enable (OE)
input is low.
The SN54BCT126A is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74BCT126A is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE
H
H
L
A
H
L
X
OUTPUT
Y
H
L
Z
SN54BCT126A . . . FK PACKAGE
(TOP VIEW)
1Y
NC
2OE
NC
2A
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
1A
1OE
NC
V
CC
4OE
4A
NC
4Y
NC
3OE
NC – No internal connection
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2Y
GND
NC
3Y
3A
Copyright
©
1994, Texas Instruments Incorporated
2–1
SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994
logic symbol
†
1OE
1A
2OE
2A
3OE
3A
4OE
4A
1
2
4
5
10
9
13
12
8
3Y
EN
1
3
6
1Y
2Y
logic diagram (positive logic)
1OE
1A
1
2
3
1Y
4
2OE
2A
4Y
3OE
10
9
8
5
6
2Y
11
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
3A
3Y
4OE
4A
Pin numbers shown are for the J, N, and W packages.
13
12
11
4Y
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
Voltage range applied to any output in the disabled or power-off state, V
O
. . . . . . . . . . . . . . . – 0.5 V to 5.5 V
Voltage range applied to any output in the high state, V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to V
CC
Current into any output in the low state: SN54BCT126A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74BCT126A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54BCT126A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74BCT126A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
recommended operating conditions
SN54BCT126A
MIN
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature
– 55
4.5
2
0.8
–18
– 12
48
125
0
NOM
5
MAX
5.5
SN74BCT126A
MIN
4.5
2
0.8
–18
– 15
64
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
2–2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VCC = 4.5 V,
VCC = 4.5 V
TEST CONDITIONS
II = –18 mA
IOH = – 3 mA
IOH = – 12 mA
IOH = – 15 mA
IOL = 48 mA
IOL = 64 mA
VI = 7 V
VI = 2.7 V
VI = 0.5 V
VO = 2.7 V
VO = 0.5 V
VO = 0
Outputs open
Outputs open
Outputs open
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
– 100
21
35
5
4
SN54BCT126A
MIN TYP†
MAX
–1.2
2.4
2
3.3
3.2
2
0.38
0.55
0.42
0.1
35
– 20
50
– 50
– 225
33
51
10
– 100
21
35
5
4
9
0.55
0.1
25
– 20
50
– 50
– 225
33
51
10
3.1
V
mA
µA
µA
µA
µA
mA
mA
mA
mA
pF
pF
2.4
3.3
V
SN74BCT126A
MIN TYP†
MAX
–1.2
UNIT
V
VOL
II
IIH
IIL
IOZH
IOZL
IOS‡
ICCH
ICCL
ICCZ
Ci
Co
VCC = 4 5 V
4.5
VCC = 0,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5 V,
VCC = 5 V,
9
† All typical values are at VCC = 5 V.
‡ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
switching characteristics (see Note 2)
VCC = 5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = 25°C
′BCT126A
MIN
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
A
Y
Y
Y
1.5
2.7
2.6
3.7
3.2
3.4
TYP
3.6
5.3
4.8
6.4
6.6
6.5
MAX
4.9
6.9
6.4
8.3
8.2
8
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = MIN to MAX§
SN54BCT126A
SN74BCT126A
MIN
1.5
2.7
2.6
3.7
3.2
3.4
MAX
5.6
7.7
7.2
10.5
9.6
12.3
MIN
1.5
2.7
2.6
3.7
3.2
3.4
MAX
6.3
7.4
7.9
10
10
10.7
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
OE
OE
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–3
SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994
2–4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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