TI SN54BCT25244W

SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
•
•
•
•
•
SN54BCT25244 . . . JT OR W PACKAGE
SN74BCT25244 . . . DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25 Ω
or Greater
Distributed VCC and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
1Y1
GND
1Y2
1Y3
GND
1Y4
2Y1
GND
2Y2
2Y3
GND
2Y4
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
1OE
1A1
1A2
VCC
1A3
1A4
2A1
2A2
VCC
2A3
2A4
2OE
SN54BCT25244 . . . FK PACKAGE
(TOP VIEW)
1A4
2A1
2A2
NC
VCC
2A3
2A4
description
These 25-Ω 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.
4
1A3
VCC
1A2
NC
1A1
1OE
1Y1
3 2 1 28 27 26
25
6
24
7
23
8
22
9
21
10
20
19
11
12 13 14 15 16 17 18
2OE
2Y4
GND
NC
2Y3
2Y2
GND
GND
1Y2
1Y3
NC
GND
1Y4
2Y1
These buffers are capable of sinking 188-mA IOL,
which facilitates switching 25-Ω transmission
lines on the incident wave. The distributed VCC
and GND pins minimize switching noise for more
reliable system operation.
5
When the output-enable (1OE and 2OE) inputs
are low, the device transmits data from the
A inputs to the Y outputs. When 1OE and 2OE are
high, the outputs are in the high-impedance state.
NC – No internal connection
The SN54BCT25244 is characterized for
operation over the full military temperature range
of – 55°C to 125°C. The SN74BCT25244 is
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer/driver)
INPUTS
OE
A
OUTPUT
Y
L
H
H
L
L
L
H
X
Z
Copyright  1993, 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
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
logic symbol†
1OE
1A1
1A2
1A3
1A4
24
logic diagram (positive logic)
1OE
EN
23
1
22
1
3
20
4
19
6
1Y1
1A1
13
1Y3
1A2
2A2
2A3
2A4
18
EN
17
1
7
9
15
10
14
12
1
22
3
20
4
1Y3
19
6
1Y4
1Y1
1Y2
1Y4
1A4
2A1
23
1Y2
1A3
2OE
24
2Y1
2Y2
2Y3
2OE
13
2Y4
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2A1
2A2
2A3
2A4
18
7
17
9
15
10
14
12
2Y1
2Y2
2Y3
2Y4
Pin numbers shown are for the DW, JT, NT, and W packages.
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 (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA
Current into any output in the low state, IO: SN54BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
SN74BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
Operating free-air temperature range: SN54BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
recommended operating conditions (see Note 2)
SN54BCT25244
SN74BCT25244
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
– 53
– 80
mA
188
mA
70
°C
High-level input voltage
2
2
Low-level output current
V
125
TA
Operating free-air temperature
NOTE 2: Unused or floating inputs must be held high or low.
– 55
125
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.75 V,
II = –18 mA
IOH = – 3 mA
VCC = 4
4.5
5V
IOH = – 53 mA
IOH = – 80 mA
VCC = 4.5 V
SN54BCT25244
MIN TYP†
MAX
SN74BCT25244
MIN TYP†
MAX
–1.2
–1.2
V
2.7
V
2
2
IOL = 94 mA
IOL = 125 mA
0.38
0.55
0.42
0.55
V
0.8
IOL = 188 mA
VI = 5.5 V
0.7
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
IIL
IOZH
VCC = 5.5 V,
VCC = 5.5 V,
IOZL
ICCL
VCC = 5.5 V,
VCC = 5.5 V,
Outputs open
90
119
ICCH
ICCZ
VCC = 5.5 V,
VCC = 5.5 V,
Outputs open
59
78
7
11
Ci
VCC = 5 V,
VCC = 5 V,
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
Co
UNIT
VI = 2.7 V
VI = 0.5 V
VO = 2.7 V
VO = 0.5 V
Outputs open
0.1
0.1
mA
20
20
µA
– 0.6
– 0.6
mA
50
50
µA
– 50
– 50
µA
90
119
mA
59
78
mA
7
11
mA
5.5
5.5
pF
17
17
pF
† All typical values are at VCC = 5 V, TA = 25°C.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Note 3)
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
PARAMETER
VCC = 5 V,
TA = 25°C
SN54BCT25244
SN74BCT25244
MIN
TYP
MAX
MIN
MAX
MIN
MAX
1
3.2
4.9
1
5.6
1
5.5
2
4
5.6
2
6.3
2
6
3.2
5.6
8.5
3.2
9.7
3.2
9.3
3.7
6.3
9.2
3.7
10.4
3.7
10.2
1.6
3.6
5.5
1.6
6.5
1.6
6.3
3.1
5.3
7.8
3.1
9.5
3.1
8.4
UNIT
ns
ns
ns
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–3
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
2–4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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Copyright  1998, Texas Instruments Incorporated