TI SN74BCT240N

SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
•
•
•
•
SN54BCT240 . . . J OR W PACKAGE
SN74BCT240 . . . DB, DW OR N PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
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 (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
description
These octal buffers and line drivers are designed
specifically to improve both the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. Taken together with the ′BCT241
and ′BCT244, these devices provide the choice of
selected combinations of inverting and
noninverting outputs, symmetrical OE (active-low
output-enable) inputs, and complementary OE
and OE inputs. These devices feature high fan-out
and improved fan-in.
1A2
2Y3
1A3
2Y2
1A4
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
1Y1
2A4
1Y2
2A3
1Y3
2Y1
GND
2A1
1Y4
2A2
The ′BCT240 is organized as two 4-bit buffers/line
drivers with separate output-enable (OE) inputs.
When OE is low, the device passes data from the
A inputs to the Y outputs. When OE is high, the
outputs are in the high-impedance state.
2OE
2Y4
1A1
1OE
VCC
SN54BCT240 . . . FK PACKAGE
(TOP VIEW)
The SN54BCT240 is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74BCT240 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
OE
A
L
H
L
L
L
H
H
X
Z
Copyright  1994, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–1
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
logic symbol†
1OE
1A1
1A2
1A3
1A4
1
logic diagram (positive logic)
1
1OE
EN
2
18
4
16
6
14
8
12
1Y1
2
18
4
16
6
14
8
12
1A1
1Y2
1Y3
1A2
2OE
2A1
2A2
2A3
2A4
1Y2
1Y4
1A3
19
1Y1
1Y3
EN
11
9
13
7
15
5
17
3
1A4
1Y4
2Y1
2Y2
2Y3
19
2OE
2Y4
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
11
9
13
7
15
5
17
3
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . – 0.5 V to 5.5 V
Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC
Input clamp current, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA
Current into any output in the low state: SN54BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
recommended operating conditions
SN54BCT240
SN74BCT240
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
0.8
V
Input clamp current
–18
–18
mA
IOH
IOL
High-level output current
– 12
– 15
mA
64
mA
TA
Operating free-air temperature
70
°C
High-level input voltage
2
2
Low-level output current
V
48
– 55
125
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V
II = –18 mA
IOH = – 3 mA
IOH = – 12 mA
IOH = – 15 mA
SN54BCT240
TYP†
MAX
MIN
SN74BCT240
TYP†
MAX
MIN
–1.2
2.4
3.3
2
3.2
–1.2
2.4
V
3.3
V
2
0.38
UNIT
3.1
VOL
VCC = 4
4.5
5V
IOL = 48 mA
IOL = 64 mA
0.55
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
0.1
0.1
mA
20
20
µA
IIL
IOZH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.5 V
VO = 2.7 V
–1
–1
mA
50
50
µA
IOZL
IOS‡
VCC = 5.5 V,
VCC = 5.5 V,
VO = 0.5 V
VO = 0
– 50
– 50
µA
– 225
mA
ICCH
ICCL
VCC = 5.5 V,
VCC = 5.5 V,
Outputs open
19
31
19
31
mA
Outputs open
46
71
46
71
mA
ICCZ
Ci
VCC = 5.5 V,
VCC = 5 V,
Outputs open
6
9
6
9
mA
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
6
0.42
– 100
– 225
– 100
Co
VCC = 5 V,
11
† 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
0.55
V
6
pF
11
pF
2–3
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†
′BCT240
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
SN54BCT240
SN74BCT240
MIN
TYP
MAX
MIN
MAX
MIN
MAX
0.5
3.3
4.8
0.5
6.4
0.5
5.6
0.4
1.8
3.5
0.4
4.5
0.4
4
1
6.4
7.9
1
9.2
1
8.8
1
7.5
9.4
1
10.8
1
10.5
1
6
6.8
1
8.5
1
8.1
1
6.7
8.1
1
10.6
1
9.5
† 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.
2–4
POST OFFICE BOX 655303
UNIT
• DALLAS, TEXAS 75265
ns
ns
ns
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Copyright  1998, Texas Instruments Incorporated