TI SN64BCT25244NT

SN64BCT25244
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS477 – DECEMBER 1992 – REVISED JANUARY 1994
•
•
•
•
•
•
DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
High-Impedance State During Power Up and
Power Down
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 and Standard
Plastic 300-mil DIPs (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
description
The SN64BCT25244 is a 25-Ω octal buffer and line driver designed specifically to improve both the performance
and density of 3-state memory address drivers, clock drivers, and bus-oriented transceivers.
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.
This buffer/driver is 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.
The outputs are in a high-impedance state during power up and power down while the supply voltage value is
less than approximately 3 V.
The SN64BCT25244 is characterized for operation from – 40°C to 85°C and 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  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
3–1
SN64BCT25244
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS477 – DECEMBER 1992 – REVISED JANUARY 1994
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
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°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.
3–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN64BCT25244
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS477 – DECEMBER 1992 – REVISED JANUARY 1994
recommended operating conditions (see Note 2)
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
IOH
IOL
MIN
NOM
MAX
4.5
5
5.5
High-level input voltage
2
UNIT
V
V
0.8
V
Input clamp current
–18
mA
High-level output current
– 80
mA
Low-level output current
188
mA
85
°C
TA
Operating free-air temperature
NOTE 2: Unused or floating inputs must be held high or low.
– 40
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
TEST CONDITIONS
MIN
VCC = 4.5 V,
VCC = 4.75 V,
II = –18 mA
IOH = – 3 mA
VCC = 4.5 V,
IOH = – 80 mA
IOL = 94 mA
TYP†
MAX
UNIT
–1.2
V
2.7
V
2
0.42
0.55
VOL
VCC = 4
4.5
5V
IOZ
VCC = 0 to 2.3 V (power up)
VCC = 2.3 to 0 (power down)
VO = 2
2.7
7 V or 0
0.5
5 V,
V
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 5.5 V
VI = 2.7 V
IIL
IOZH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.5 V
VO = 2.7 V
IOZL
ICCL
VCC = 5.5 V,
VCC = 5.5 V,
VO = 0.5 V
Outputs open
– 50
µA
90
119
mA
ICCH
ICCZ
VCC = 5.5 V,
VCC = 5.5 V,
Outputs open
59
78
mA
7
11
mA
Ci
VCC = 5 V,
VCC = 5 V,
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
IOL = 188 mA
0.7
± 50
OE at 0.8
08V
± 50
Outputs open
Co
† All typical values are at VCC = 5 V, TA = 25°C.
V
µA
0.1
mA
20
µA
– 0.6
mA
50
µA
5.5
pF
17
pF
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
TA = – 40°C
to 85°C
TA = 0°C
to 70°C
UNIT
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
ns
ns
ns
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3–3
SN64BCT25244
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS477 – DECEMBER 1992 – REVISED JANUARY 1994
3–4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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