SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS083B – APRIL 1982 – REVISED DECEMBER 1994
•
•
•
•
•
•
Eight Latches in a Single Package
3-State Bus-Driving True Outputs
Full Parallel Access for Loading
Buffered Control Inputs
pnp Inputs Reduce dc Loading on Data
Lines
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
These octal transparent D-type latches feature
3-state outputs designed specifically for driving
highly capacitive or relatively low-impedance
loads. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
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) 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 the increased drive
provide the capability to drive bus lines without
interface or pullup components.
SN54ALS373, SN54AS373 . . . J PACKAGE
SN74ALS373A, SN74AS373 . . . DW OR N PACKAGE
(TOP VIEW)
OE
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
LE
SN54ALS373, SN54AS373 . . . FK PACKAGE
(TOP VIEW)
OE
V
CC
1D
1Q
2D
2Q
3Q
3D
4D
3
4
5
6
7
8
2 1 20 19
18
17
16
15
8Q
8D
7D
7Q
6Q
6D
14
9 10 11 12 13
OE does not affect internal operations of the latches. Old data can be retained or new data can be entered while
the outputs are off.
The SN54ALS373 and SN54AS373 are characterized for operation over the full military temperature range of
– 55°C to 125°C. The SN74ALS373A and SN74AS373 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each latch)
INPUTS
OE
L
L
L
H
LE
H
H
L
X
D
H
L
X
X
OUTPUT
Q
H
L
Q0
Z
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.
Copyright
©
1994, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
4Q
GND
LE
5Q
5D
1
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS083B – APRIL 1982 – REVISED DECEMBER 1994
logic symbol
†
OE
LE
1D
2D
3D
4D
5D
6D
7D
8D
1
11
3
4
7
8
13
14
17
18
EN
C1
1D
2
5
6
9
12
15
16
19
logic diagram (positive logic)
OE
LE
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
To Seven Other Channels
1D
3
C1
1D
2
1Q
1
11
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to any output in the high state or power-off state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T
A
: SN54ALS373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74ALS373A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
recommended operating conditions
SN54ALS373
MIN
VCC
VIH
VIL
IOH
IOL
tw
tsu
th
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Pulse duration, LE high
Setup time, data before LE↓
Hold time, data after LE↓
Operating free-air temperature
12
10
7
– 55
125
4.5
2
0.7
–1
12
10
10
7
0
70
NOM
5
MAX
5.5
SN74ALS373A
MIN
4.5
2
0.8
– 2.6
24
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
ns
ns
ns
°C
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS083B – APRIL 1982 – REVISED DECEMBER 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4 5 V
4.5
VCC = 4 5 V
4.5
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V
II = – 18 mA
IOH = – 0.4 mA
IOH = – 1 mA
IOH = – 2.6 mA
IOL = 12 mA
IOL = 24 mA
VO = 2.7 V
VO = 0.4 V
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
Outputs high
ICC
Outputs low
Outputs disabled
– 20
9
16
17
SN54ALS373
MIN TYP†
MAX
– 1.5
VCC – 2
2.4
VCC – 2
3.3
2.4
0.25
0.4
20
– 20
0.1
20
– 0.1
– 112
16
25
27
– 30
9
16
17
3.2
0.25
0.35
0.4
0.5
20
– 20
0.1
20
– 0.1
– 112
16
25
27
mA
V
µA
µA
mA
µA
mA
mA
V
SN74ALS373A
MIN TYP†
MAX
– 1.5
UNIT
V
VOL
IOZH
IOZL
II
IIH
IIL
IO‡
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω
,
R2 = 500
Ω
,
TA = MIN to MAX§
SN54ALS373
SN74ALS373A
MIN
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
D
LE
2
Q
Any
An Q
Any
An Q
Any Q
1
6
1
6
OE
OE
5
2
2
MAX
17
19
29
27
22
24
16
24
MIN
2
4
6
7
1
5
1
2
MAX
12
16
22
23
18
20
10
12
ns
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS083B – APRIL 1982 – REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to any output in the high state or power-off state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T
A
: SN54AS373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74AS373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
recommended operating conditions
SN54AS373
MIN
VCC
VIH
VIL
IOH
IOL
tw*
tsu*
th*
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Pulse duration, LE high
Setup time, data before LE↓
Hold time, data after LE↓
5.5
2
3
4.5
2
0.8
– 12
32
4.5
2
3
NOM
5
MAX
5.5
SN74AS373
MIN
4.5
2
0.8
– 15
48
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
ns
ns
ns
°C
TA
Operating free-air temperature
– 55
125
0
70
* On products compliant to MIL-STD-883, Class B, this parameter is based on characterization data but is not production tested.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4 5 V
4.5
VCC = 4 5 V
4.5
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V
II = – 18 mA
IOH = – 2 mA
IOH = – 12 mA
IOH = – 15 mA
IOL = 32 mA
IOL = 48 mA
VO = 2.7 V
VO = 0.4 V
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
Outputs high
ICC
Outputs low
Outputs disabled
– 0.02
– 30
55
55
65
SN54AS373
MIN TYP‡
MAX
– 1.2
VCC – 2
2.4
VCC – 2
3.2
2.4
0.27
0.5
0.32
50
– 50
0.1
20
– 0.5
– 112
90
85
100
– 30
55
55
65
– 0.02
0.5
50
– 50
0.1
20
– 0.5
– 112
90
85
100
mA
3.3
V
µA
µA
mA
µA
mA
mA
V
SN74AS373
MIN TYP‡
MAX
– 1.2
UNIT
V
VOL
IOZH
IOZL
II
IIH
IIL
IO§
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS373, SN54AS373, SN74ALS373A, SN74AS373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS083B – APRIL 1982 – REVISED DECEMBER 1994
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω
,
R2 = 500
Ω
,
TA = MIN to MAX†
SN54AS373
MIN
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
D
LE
3
Q
Any
An Q
Any
An Q
Any Q
3
6.5
5
2
OE
OE
4.5
3
3
MAX
9
8
14.5
9
7.5
10.5
10
8
SN74AS373
MIN
3.5
3.5
6.5
5
2
4.5
3
3
MAX
6
6
11.5
7.5
6.5
9.5
6.5
7
ns
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
5
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