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SN54ABT2244, SN74ABT2244
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS106B – JANUARY 1991 – REVISED JULY 1994
•
•
•
•
Output Ports Have Equivalent 25-Ω Series
Resistors, So No External Resistors Are
Required
State-of-the-Art
EPIC-
ΙΙ
B
™
BiCMOS Design
Significantly Reduces Power Dissipation
Typical V
OLP
(Output Ground Bounce)
< 1 V at V
CC
= 5 V, T
A
= 25°C
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), and
Plastic (N) and Ceramic (J) DIPs
SN54ABT2244 . . . J PACKAGE
SN74ABT2244 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
description
These 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. Taken together with the
′ABT2240
and
′ABT2241,
these devices provide the choice
of selected combinations of inverting and
noninverting outputs, symmetrical active-low
output-enable (OE) inputs, and complementary
OE and OE inputs. These devices feature high
fan-out and improved fan-in.
The outputs, which are designed to sink up to
12 mA, include 25-Ω series resistors to reduce
overshoot and undershoot.
SN54ABT2244 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
V
CC
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
2OE
1Y1
2A4
1Y2
2A3
1Y3
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN74ABT2244 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN54ABT2244 is characterized for operation over the full military temperature range of – 55°C to 125°C.
The SN74ABT2244 is characterized for operation from – 40°C to 85°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE
L
L
H
A
H
L
X
OUTPUT
Y
H
L
Z
EPIC-ΙΙB is a trademark of 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
2Y1
GND
2A1
1Y4
2A2
Copyright
©
1994, Texas Instruments Incorporated
6–1
SN54ABT2244, SN74ABT2244
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS106B – JANUARY 1991 – REVISED JULY 1994
logic symbol
†
1OE
1
EN
18
16
14
12
logic diagram (positive logic)
1OE
1
1A1
1A2
1A3
1A4
2
4
6
8
1
1Y1
1Y2
1Y3
1Y4
1A1
2
18
1Y1
1A2
4
16
1Y2
1A3
2OE
19
EN
9
7
5
3
1A4
2Y1
2Y2
2Y3
2Y4
2A1
2OE
6
14
1Y3
8
12
2A1
2A2
2A3
2A4
11
13
15
17
1Y4
1
19
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
11
9
2Y1
2A2
13
7
2Y2
schematic of Y outputs
VCC
2A3
15
5
2Y3
2A4
17
3
2Y4
Output
GND
6–2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ABT2244, SN74ABT2244
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS106B – JANUARY 1991 – REVISED JULY 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Input voltage range, V
I
(except I/O ports) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Voltage range applied to any output in the high state or power-off state, V
O
. . . . . . . . . . . . . – 0.5 V to 5.5 V
Current into any output in the low state, I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Input clamp current, I
IK
(V
I
< 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 mA
Output clamp current, I
OK
(V
O
< 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 50 mA
Maximum power dissipation at T
A
= 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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 negative-voltage ratings may be exceeded if the input and output clamp-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. For more information, refer to the
Package Thermal Considerations
application note in the 1994
ABT Advanced BiCMOS Technology Data Book,
literature number SCBD002B.
recommended operating conditions (see Note 3)
SN54ABT2244
MIN
VCC
VIH
VIL
VI
IOH
IOL
∆t
/∆v
∆t
/∆VCC
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
High-level output current
Low-level output current
Input transition rise or fall rate
Power-up ramp rate
Outputs enabled
200
– 55
125
0
4.5
2
0.8
VCC
– 24
12
5
200
– 40
85
0
MAX
5.5
SN74ABT2244
MIN
4.5
2
0.8
VCC
– 32
12
5
MAX
5.5
UNIT
V
V
V
V
mA
mA
ns / V
µs
/ V
°C
TA
Operating free-air temperature
NOTE 3: Unused or floating inputs must be held high or low.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
6–3
SN54ABT2244, SN74ABT2244
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS106B – JANUARY 1991 – REVISED JULY 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VCC = 4.5 V,
VCC = 4.5 V,
VCC = 5 V,
VCC = 4 5 V
4.5
VOL
II
IOZPU
IOZPD
IOZH
IOZL
Ioff
ICEX
IO‡
ICC
VCC = 4.5 V,
VCC = 0 to 5.5 V,
VCC = 0 to 2.1 V,
VCC = 2.1 V to 0,
VCC = 2.1 V to 5.5 V,
VCC = 2.1 V to 5.5 V,
VCC = 0,
VCC = 5.5 V,
VO = 5.5 V
VCC = 5.5 V,
VCC = 5.5 V,
IO = 0,
VI = VCC or GND
VCC = 5.5 V,
One input at 3.4 V
O i
V,
Other in uts at
inputs
VCC or GND
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
TEST CONDITIONS
II = –18 mA
IOH = – 3 mA
IOH = – 3 mA
IOH = – 24 mA
IOH = – 32 mA
IOL = 12 mA
VI = VCC or GND
VO = 0.5 to 2.7 V, OE = X
VO = 0.5 to 2.7 V, OE = X
VO = 2.7 V, OE
≥
2 V
VO = 0.5 V, OE
≥
2 V
VI or VO
≤
4.5 V
Outputs high
VO = 2.5 V
Outputs high
Outputs low
Outputs disabled
Data
inputs
Outputs enabled
Outputs disabled
– 50
–100
1
24
0.5
TA = 25°C
MIN TYP† MAX
–1.2
2.5
3
2
2*
0.8
±1
±
50
±
50
10
– 10
±100
50
–180
250
30
250
1.5
0.05
1.5
3
8.5
– 50
50
–180
250
30
250
1.5
0.05
1.5
– 50
0.8
±1
±
50
±
50
10
– 10
2.5
3
2
2
0.8
±1
±
50
±
50
10
– 10
±100
50
–180
250
30
250
1.5
0.05
1.5
pF
pF
mA
V
µA
µA
µA
µA
µA
µA
µA
mA
µA
mA
µA
SN54ABT2244
MIN
MAX
–1.2
2.5
3
V
SN74ABT2244
MIN
MAX
–1.2
UNIT
V
VOH
∆I
CC§
Control inputs
Ci
Co
* On products compliant to MIL-STD-883, Class B, this parameter does not apply.
† All typical values are at VCC = 5 V.
‡ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
§ This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
FROM
(INPUT)
A
TO
(OUTPUT)
Y
Y
Y
VCC = 5 V,
TA = 25°C
MIN
1
1
1.1
2.1
2.1
1.7
TYP
3.4
4.5
3.8
6.3
4.5
4.3
MAX
4.3
5.3
4.8
7.3
5.6
5.3
SN54ABT2244
MIN
1
1
1.1
2.1
2.1
1.7
MAX
5.3
6.8
6.5
10.2
7
7.4
SN74ABT2244
MIN
1
1
1.1
2.1
2.1
1.7
MAX
4.7
5.6
5.5
8.3
6.6
5.8
ns
ns
ns
UNIT
OE
OE
6–4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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