SN54ABT373, SN74ABT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS155D JANUARY 1991 REVISED MAY 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
State-of-the-Art
EPIC-
B
TM
BiCMOS Design
Significantly Reduces Power Dissipation
D
Latch-Up Performance Exceeds 500 mA Per
JEDEC Standard JESD-17
D
Typical V
OLP
(Output Ground Bounce) < 1 V
at V
CC
= 5 V, T
A
= 25
C
D
High-Drive Outputs (32-mA I
OH
, 64-mA I
OL
)
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK),
Ceramic Flat (W) Package, and Plastic (N)
and Ceramic (J) DIPs
description
The eight latches of the 'ABT373 are transparent
D-type latches. While the latch-enable (LE) input
is high, the Q outputs follow the data (D) inputs.
When LE is taken low, the Q outputs are latched
at the logic levels set up at the D inputs.
A buffered output-enable (OE) input can be used
to place the eight outputs in either a normal logic
state (high or low logic levels) or a
high-impedance state. In the high-impedance
state, the outputs neither load nor drive the bus
lines significantly. The high-impedance state and
increased drive provide the capability to drive bus
lines without need for interface or pullup
components.
OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
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 SN54ABT373 is characterized for operation over the full military temperature range of 55
C to 125
C. The
SN74ABT373 is characterized for operation from 40
C to 85
C.
FUNCTION TABLE
(each latch)
INPUTS
OUTPUT
OE
LE
D
Q
L
H
H
H
L
H
L
L
L
L
X
Q0
H
X
X
Z
Copyright
1997, 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.
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-
B is a trademark of Texas Instruments Incorporated.
SN54ABT373 . . . J OR W PACKAGE
SN74ABT373 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
SN54ABT373 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
V
CC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
LE
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
2D
2Q
3Q
3D
4D
1D
1Q
OE
5Q
5D
8Q
4Q
GND
LE
V
CC
8D
7D
7Q
6Q
6D
SN54ABT373, SN74ABT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS155D JANUARY 1991 REVISED MAY 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
1D
3
1D
4
2D
7
3D
EN
1
1Q
2
2Q
5
3Q
6
8
4D
13
5D
14
6D
4Q
9
5Q
12
6Q
15
OE
17
7D
18
8D
C1
11
LE
7Q
16
8Q
19
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OE
To Seven Other Channels
1
11
3
2
LE
1D
C1
1D
1Q
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
(see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or power-off state, V
O
0.5 V to 5.5 V
. . . . . . . . . . . . . . . . . . .
Current into any output in the low state, I
O
: SN54ABT373 96
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ABT373 128
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
18 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DB package
115
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
97
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
67
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
128
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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 package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages,
which use a trace length of zero.
SN54ABT373, SN74ABT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS155D JANUARY 1991 REVISED MAY 1997
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54ABT373
SN74ABT373
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
4.5
5.5
4.5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
VI
Input voltage
0
VCC
0
VCC
V
IOH
High-level output current
24
32
mA
IOL
Low-level output current
48
64
mA
t/
v
Input transition rise or fall rate
Outputs enabled
5
5
ns/V
TA
Operating free-air temperature
55
125
40
85
C
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TA = 25
C
SN54ABT373
SN74ABT373
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
1.2
V
VCC = 4.5 V,
IOH = 3 mA
2.5
2.5
2.5
VOH
VCC = 5 V,
IOH = 3 mA
3
3
3
V
VOH
VCC = 4 5 V
IOH = 24 mA
2
2
V
VCC = 4.5 V
IOH = 32 mA
2*
2
VOL
VCC = 4 5 V
IOL = 48 mA
0.55
0.55
V
VOL
VCC = 4.5 V
IOL = 64 mA
0.55*
0.55
V
Vhys
100
mV
II
VCC = 5.5 V,
VI = VCC or GND
1
1
1
A
IOZH
VCC = 5.5 V,
VO = 2.7 V
10
10
10
A
IOZL
VCC = 5.5 V,
VO = 0.5 V
10
10
10
A
Ioff
VCC = 0,
VI or VO
4.5 V
100
100
A
ICEX
VCC = 5.5 V,
VO = 5.5 V
Outputs high
50
50
50
A
IO
VCC = 5.5 V,
VO = 2.5 V
50
100
180
50
180
50
180
mA
V
5 5 V I
0
Outputs high
1
250
250
250
A
ICC
VCC = 5.5 V, IO = 0,
VI = VCC or GND
Outputs low
24
30
30
30
mA
VI = VCC or GND
Outputs disabled
0.5
250
250
250
A
ICC
VCC = 5.5 V, One input at 3.4 V,
Other inputs at VCC or GND
1.5
1.5
1.5
mA
Ci
VI = 2.5 V or 0.5 V
3
pF
Co
VO = 2.5 V or 0.5 V
6
pF
* On products compliant to MIL-PRF-38535, this parameter does not apply.
All typical values are at VCC = 5 V.
This data sheet limit may vary among suppliers.
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.
SN54ABT373, SN74ABT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS155D JANUARY 1991 REVISED MAY 1997
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
SN54ABT373
VCC = 5 V,
TA = 25
C
MIN
MAX
UNIT
MIN
MAX
tw
Pulse duration, LE high
3.3
3.3
ns
tsu
Setup time data before LE
High
2.2
2.5
ns
tsu
Setup time, data before LE
Low
2.2
2.5
ns
th
Hold time, data after LE
High or low
2.2
2.5
ns
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
SN74ABT373
VCC = 5 V,
TA = 25
C
MIN
MAX
UNIT
MIN
MAX
tw
Pulse duration, LE high
3.3
3.3
ns
t
Setup time data before LE
High
1.9
1.9
ns
tsu
Setup time, data before LE
Low
1.5
1.5
ns
th
Hold time, data after LE
High or low
1
1
ns
SN54ABT373, SN74ABT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS155D JANUARY 1991 REVISED MAY 1997
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
SN54ABT373
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
TA = 25
C
MIN
MAX
UNIT
MIN
TYP
MAX
tPLH
D
Q
1.9
3.9
5.4
1.3
6.8
ns
tPHL
D
Q
2.2
4.2
5.7
2
7
ns
tPLH
LE
Q
2.2
4.6
6.1
1.8
7.7
ns
tPHL
LE
Q
3.2
5.2
6.7
2.5
7.7
ns
tPZH
OE
Q
1.2
3.2
5.5
1
6.2
ns
tPZL
OE
Q
2
4.7
6.2
1.5
7.2
ns
tPHZ
OE
Q
2.5
4.9
6.4
2.4
8
ns
tPLZ
OE
Q
2
4.5
6
2
7
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
SN74ABT373
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
TA = 25
C
MIN
MAX
UNIT
MIN
TYP
MAX
tPLH
D
Q
1.9
3.9
5.4
1.9
5.9
ns
tPHL
D
Q
2.2
4.2
5.7
2.2
6.2
ns
tPLH
LE
Q
2.2
4.6
6.1
2.2
6.6
ns
tPHL
LE
Q
3.2
5.2
6.7
3.2
7.2
ns
tPZH
OE
Q
1.2
3.2
4.7
1.2
5.2
ns
tPZL
OE
Q
2.7
4.7
6.2
2.7
6.7
ns
tPHZ
OE
Q
2.5
4.9
6.4
2.5
6.9
ns
tPLZ
OE
Q
2
4.5
6
2
6.5
ns
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