TI SN74AC244DW

SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996
D
EPIC  (Enhanced-Performance Implanted
CMOS) 1-µm Process
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), Flat
(W), and DIP (J, N) Packages
SN54AC244 . . . J OR W PACKAGE
SN74AC244 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
description
These octal buffers and line drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters.
The ’AC244 are organized as two 4-bit
buffers/drivers with separate output-enable (OE)
inputs. When OE is low, the device passes
noninverted data from the A inputs to the Y
outputs. When OE is high, the outputs are in the
high-impedance state.
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
2Y4
1A1
1OE
VCC
SN54AC244 . . . FK PACKAGE
(TOP VIEW)
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 SN54AC244 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74AC244 is characterized for
operation from –40°C to 85°C.
2OE
D
FUNCTION TABLE
(each buffer)
INPUTS
OE
A
OUTPUT
Y
L
H
H
L
L
L
H
X
Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright  1996, 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
1
SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996
logic symbol†
1OE
1A1
1A2
1A3
1A4
1
EN
2OE
2
18
4
16
6
14
8
12
1Y1
2A1
1Y2
2A2
1Y3
2A3
1Y4
2A4
19
EN
11
9
13
7
15
5
17
3
2Y1
2Y2
2Y3
2Y4
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive Logic)
1OE
1A1
1A2
1A3
1A4
1
2OE
2
18
4
16
6
14
8
12
1Y1
2A1
1Y2
2A2
1Y3
2A3
1Y4
2A4
19
11
9
13
7
15
5
17
3
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 VCC + 0.5 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . 0.6 W
DW package . . . . . . . . . . . . . . . . . . 1.6 W
N package . . . . . . . . . . . . . . . . . . . . 1.3 W
PW package . . . . . . . . . . . . . . . . . . 0.7 W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
2
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• DALLAS, TEXAS 75265
SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996
recommended operating conditions (see Note 3)
SN54AC244
VCC
VIH
Supply voltage
VCC = 3 V
VCC = 4.5 V
High-level input voltage
VCC = 5.5 V
VCC = 3 V
VIL
VI
VO
IOH
IOL
∆t/∆v
Low-level input voltage
MIN
MAX
2
6
Low-level output current
6
3.15
3.85
0.9
1.35
1.35
1.65
1.65
VCC
VCC
0
0
VCC
VCC
–12
–24
–24
VCC = 5.5 V
VCC = 3 V
–24
–24
12
12
VCC = 4.5 V
VCC = 5.5 V
24
24
24
24
• DALLAS, TEXAS 75265
V
3.85
0.9
–12
TA
Operating free-air temperature
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
UNIT
V
VCC = 3 V
VCC = 4.5 V
Input transition rise or fall rate
POST OFFICE BOX 655303
2
3.15
0
High-level output current
MAX
2.1
0
Output voltage
MIN
2.1
VCC = 4.5 V
VCC = 5.5 V
Input voltage
SN74AC244
V
V
V
mA
mA
0
8
0
8
ns/V
–55
125
–40
85
°C
3
SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
IOH = –50 µA
IOH = –12 mA
VOH
IOL = –24
24 mA
A
IOH = –50 mA†
IOH = –75 mA†
IOL = 24 mA
IOL = 50 mA†
IOL = 75 mA†
MAX
SN74AC244
MIN
2.9
2.9
2.9
4.5 V
4.4
4.4
4.4
5.5 V
5.4
5.4
5.4
3V
2.56
2.4
2.46
4.5 V
3.86
3.7
3.76
5.5 V
4.86
4.7
4.76
V
3.85
0.1
0.1
0.1
4.5 V
0.1
0.1
0.1
5.5 V
0.1
0.1
0.1
3V
0.36
0.5
0.44
4.5 V
0.36
0.5
0.44
5.5 V
0.36
0.5
0.44
VO = VCC or GND,
VI(OE) = VIL or VIH
5.5 V
ICC
Ci
VI = VCC or GND,
VI = VCC or GND
V
1.65
5.5 V
IOZ
UNIT
3.85
5.5 V
IO = 0
MAX
3V
55V
5.5
Control inputs
MIN
3V
VI = VCC or GND
VI = VCC or GND
II
SN54AC244
5.5 V
IOL = 12 mA
Data inputs
TA = 25°C
TYP
MAX
5.5 V
IOL = 50 µA
VOL
MIN
1.65
± 0.1
±1
±1
± 0.1
±1
±1
± 0.25
±5
± 2.5
µA
4
80
40
µA
5.5 V
5V
2.5
µA
pF
† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
switching characteristics over recommended operating
VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
4
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
POST OFFICE BOX 655303
MIN
free-air
TA = 25°C
TYP
MAX
temperature
SN54AC244
SN74AC244
MIN
MAX
MIN
MAX
2
6.5
9
1
12.5
1.5
10
2
6.5
9
1
12
2
10
2
6
10.5
1
11.5
1.5
11
2.5
7.5
10
1
13
2
11
3
7
10
1
12.5
1.5
10.5
2.5
7.5
10.5
1
13
2.5
11.5
• DALLAS, TEXAS 75265
range,
UNIT
ns
ns
ns
SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996
switching characteristics over recommended operating
VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
free-air
MIN
TA = 25°C
TYP
MAX
1.5
5
1.5
temperature
SN54AC244
range,
SN74AC244
MIN
MAX
MIN
MAX
7
1
9.5
1
7.5
5
7
1
9
1
7.5
1.5
5
7
1
9
1.5
8
1.5
5.5
8
1
10.5
1.5
8.5
2.5
6.5
9
1
10.5
1
9.5
2
6.5
9
1
11
2
9.5
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance per buffer/driver
CL = 50 pF,
TYP
f = 1 MHz
45
UNIT
pF
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
500 Ω
From Output
Under Test
CL = 50 pF
(see Note A)
Open
500 Ω
Output
Control
(low-level
enabling)
LOAD CIRCUIT
Input
VCC
50% VCC
50% VCC
0V
tPLH
tPHL
VOH
Output
50% VCC
50% VCC
VOL
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
Open
VCC
50% VCC
0V
tPZL
[ VCC
tPLZ
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
Output
Waveform 2
S1 at Open
(see Note B)
50% VCC
50% VCC
tPHZ
tPZH
VOLTAGE WAVEFORMS
VOL + 0.3 V
VOL
50% VCC
VOH – 0.3 V
VOH
[0V
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
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Copyright  1998, Texas Instruments Incorporated