SCAS766B − APRIL 2004 − REVISED JANUARY 2008
D
D
D
D
D
PW PACKAGE
(TOP VIEW)
Qualified for Automotive Applications
4.5-V to 5.5-V VCC Operation
Inputs Accept Voltages to 5.5 V
Max tpd of 9 ns at 5 V
Inputs Are TTL Compatible
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
description/ordering information
This octal buffer/driver is designed specifically to
improve the performance and density of 3-state
memory address drivers, clock drivers, and
bus-oriented receivers and transmitters.
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
The SN74ACT244 device is 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.
To ensure the high-impedance state during power up or power down, OE shall be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION†
−40°C to 85°C
ORDERABLE
PART NUMBER
PACKAGE‡
TA
TSSOP − PW
Tape and reel
SN74ACT244IPWRQ1
TOP-SIDE
MARKING
ACT244I
† For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at www.ti.com.
‡ Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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.
Copyright 2008, Texas Instruments Incorporated
!"# $ %& ' # "$ (&)*%"# +"#',
+&%#$ % ! # $('% %"# $ (' #-' #' !$ '."$ $# &!' #$
$#" +" + /" " #0, +&%# ( %'$$ 1 + '$ # '%'$$" *0 %*&+'
#'$# 1 "** (" "!'#' $,
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SCAS766B − APRIL 2004 − REVISED JANUARY 2008
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
Package thermal impedance, θJA (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/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 package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
MIN
MAX
4.5
5.5
VCC
VIH
Supply voltage
VIL
VI
Low-level input voltage
Input voltage
0
VO
IOH
Output voltage
0
IOL
∆t/∆v
High-level input voltage
2
UNIT
V
V
0.8
V
VCC
VCC
V
High-level output current
−24
mA
Low-level output current
24
mA
8
ns/V
Input transition rise or fall rate
V
TA
Operating free-air temperature
−40
85
°C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SCAS766B − APRIL 2004 − REVISED JANUARY 2008
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
4.5 V
4.4
4.49
5.5 V
5.4
5.49
4.5 V
3.86
3.76
IOH = −24 mA
5.5 V
4.86
4.76
IOH = −75 mA†
5.5 V
IOH = −50 µA
A
VOH
TA = 25°C
TYP
MAX
VCC
IOL = 50 µA
A
MIN
MAX
UNIT
4.4
5.4
V
3.85
4.5 V
0.001
5.5 V
0.001
0.1
0.1
0.1
0.1
4.5 V
0.36
0.44
IOL = 24 mA
5.5 V
0.36
0.44
IOL = 75 mA†
5.5 V
IOZ
VO = VCC or GND
5.5 V
±0.25
±2.5
µA
II
ICC
VI = VCC or GND
VI = VCC or GND,
5.5 V
±0.1
±1
µA
5.5 V
4
40
µA
∆ICC‡
One input at 3.4 V,
Other inputs at GND or VCC
1.5
mA
VOL
IO = 0
1.65
5.5 V
0.6
Ci
VI = VCC or GND
5V
2.5
Co
VI = VCC or GND
5V
8
† Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.
switching characteristics over recommended operating
VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
PARAMETER
V
free-air
pF
pF
temperature
TA = 25°C
MIN
TYP
MAX
MIN
MAX
2
6.5
9
1.5
10
2
7
9
1.5
10
1.5
7
8.5
1
9.5
2
7
9.5
1.5
10.5
2
8
9.5
1.5
10.5
2.5
7.5
10
2
10.5
range,
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance per buffer/driver
POST OFFICE BOX 655303
CL = 50 pF,
• DALLAS, TEXAS 75265
f = 1 MHz
TYP
45
UNIT
pF
3
SCAS766B − APRIL 2004 − REVISED JANUARY 2008
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
500 Ω
From Output
Under Test
CL = 50 pF
(see Note A)
Open
500 Ω
LOAD CIRCUIT
Output
Control
(low-level
enabling)
3V
Input
1.5 V
1.5 V
0V
tPLH
Output
tPHL
VOH
50% VCC
VOL
50% VCC
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
Open
3V
1.5 V
1.5 V
0V
tPLZ
tPZL
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
≈VCC
50% VCC
tPHZ
tPZH
Output
Waveform 2
S1 at Open
(see Note B)
VOLTAGE WAVEFORMS
VOL + 0.3 V
VOL
50% VCC
VOH − 0.3 V
VOH
≈0 V
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
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74ACT244IPWRG4Q1
ACTIVE
TSSOP
PW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
ACT244I
SN74ACT244IPWRQ1
ACTIVE
TSSOP
PW
20
2000
RoHS & Green
NIPDAU
Level-3-260C-168 HR
-40 to 85
ACT244I
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
