SN74BCT757
OCTAL BUFFER/DRIVER
WITH OPEN-COLLECTOR OUTPUTS
SCBS041D – NOVEMBER 1989 – REVISED NOVEMBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• BiCMOS Design Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
• Open-Collector Outputs Drive Bus Lines
or Buffer Memory Address Registers
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (N)
description
This octal buffer and line driver is designed
specifically to improve both the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. This device provides
complementary output-enable (OE and OE
)
inputs and noninverting outputs.
The SN74BCT757 is characterized for operation
from 0°C to 70°C.
FUNCTION TABLES
INPUTS
OUTPUT
1OE 1A
1Y
H X H
L LL
L H H
INPUTS
OUTPUT
2OE 2A
2Y
L X H
H LL
H H H
DW OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
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.
SN74BCT757
OCTAL BUFFER/DRIVER
WITH OPEN-COLLECTOR OUTPUTS
SCBS041D – NOVEMBER 1989 – REVISED NOVEMBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2
1A1
4
1A2
6
1A3
8
1A4
EN
1
1Y1
18
1Y2
16
1Y3
14
1Y4
12
11
2A1
13
2A2
15
2A3
17
2A4
EN
19
2OE
2Y1
9
2Y2
7
2Y3
5
2Y4
3
1OE
1
2
4
6
8
19
11
13
15
17
3
5
7
9
12
14
16
18
1A1
1A2
1A3
1A4
1Y1
2OE
2A1
2A2
2A3
2A4
2Y1
1Y2
1Y3
1Y4
2Y2
2Y3
2Y4
1OE
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, V
I
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range, I
I
–30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, IO 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range 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.
SN74BCT757
OCTAL BUFFER/DRIVER
WITH OPEN-COLLECTOR OUTPUTS
SCBS041D – NOVEMBER 1989 – REVISED NOVEMBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 1)
MIN NOM MAX UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
V
OH
High-level output voltage 5.5 V
I
IK
Input clamp current –18 mA
I
OL
Low-level output current 64 mA
T
A
Operating free-air temperature 0 70 °C
NOTE 1: Unused or floating inputs must be held high or low .
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
VCC = 4.5 V, II = –18 mA –1.2 V
V
OL
VCC = 4.5 V, IOL = 64 mA 0.42 0.55 V
I
I
VCC = 5.5 V, VI = 7 V 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 µA
I
IL
VCC = 5.5 V, VI = 0.5 V –1 mA
I
OH
VCC = 4.5 V, VOH = 5.5 V 0.1 mA
Outputs high 34
I
CC
VCC = 5.5 V, Outputs open
Outputs low
77
mA
OE and OE inactive 10
C
i
VCC = 5 V, VI = 2.5 V or 0.5 V 6 pF
C
o
VCC = 5 V, VO = 2.5 V or 0.5 V 4 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, C
L
= 50 pF (unless otherwise noted) (see Note 2)
PARAMETER
FROM
TO
VCC = 5 V,
TA = 25°C
MIN MAX UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX
t
PLH
6.9 8.3 9.6 6.6 10.1
t
PHL
A
Y
2.4 4.2 6 2 6.6
ns
t
PLH
11 14.8 17.9 10.8 19.7
t
PHL
2OE
Y
2.9 4.6 6.2 2.6 6.9
ns
t
PLH
11.4 13.9 16.1 10 18
t
PHL
1OE
Y
4.4 6.1 7.8 4 8.5
ns
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
SN74BCT757
OCTAL BUFFER/DRIVER
WITH OPEN-COLLECTOR OUTPUTS
SCBS041D – NOVEMBER 1989 – REVISED NOVEMBER 1993
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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