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SN54HC373, SN74HC373
OCTAL TRANSPARENT D TYPE LATCHES
WITH 3 STATE OUTPUTS
SCLS140D − DECEMBER 1982 − REVISED AUGUST 2003
D
Wide Operating Voltage Range of 2 V to 6 V
D
High-Current 3-State True Outputs Can
D
D
Drive Up To 15 LSTTL Loads
Low Power Consumption, 80-µA Max I
CC
Typical t
pd
= 13 ns
SN54HC373 . . . J OR W PACKAGE
SN74HC373 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
D
±6-mA
Output Drive at 5 V
D
Low Input Current of 1
µA
Max
D
Eight High-Current Latches in a Single
D
Package
Full Parallel Access for Loading
SN54HC373 . . . FK 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
1D
1Q
OE
V
CC
8Q
2D
2Q
3Q
3D
4D
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
8D
7D
7Q
6Q
6D
description/ordering information
These 8-bit 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.
The eight latches of the ’HC373 devices 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 levels that
were set up at the D inputs.
ORDERING INFORMATION
TA
PDIP − N
SOIC − DW
SOP − NS
−40°C to 85°C
SSOP − DB
PACKAGE†
Tube of 20
Tube of 25
Reel of 2000
Reel of 2000
Reel of 2000
Tube of 70
TSSOP − PW
CDIP − J
−55 C 125°C
−55°C to 125 C
CFP − W
LCCC − FK
Reel of 2000
Reel of 250
Tube of 20
Tube of 85
Tube of 55
ORDERABLE
PART NUMBER
SN74HC373N
SN74HC373DW
SN74HC373DWR
SN74HC373NSR
SN74HC373DBR
SN74HC373PW
SN74HC373PWR
SN74HC373PWT
SNJ54HC373J
SNJ54HC373W
SNJ54HC373FK
SNJ54HC373J
SNJ54HC373W
SNJ54HC373FK
HC373
HC373
HC373
HC373
TOP-SIDE
MARKING
SN74HC373N
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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.
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.
On products compliant to MIL PRF 38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
Copyright
2003, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
4Q
GND
LE
5Q
5D
1
SCLS140D − DECEMBER 1982 − REVISED AUGUST 2003
SN54HC373, SN74HC373
OCTAL TRANSPARENT D TYPE LATCHES
WITH 3 STATE OUTPUTS
description/ordering information (continued)
An output-enable (OE) input places the eight outputs in either a normal logic state (high or low logic levels) or
the 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
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 off.
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
logic diagram (positive logic)
OE
1
LE
11
C1
2
1D
3
1D
1Q
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±20
mA
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±20
mA
Continuous output current, I
O
(V
O
= 0 to V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±35
mA
Continuous current through V
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±70
mA
Package thermal impedance,
θ
JA
(see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°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 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.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54HC373, SN74HC373
OCTAL TRANSPARENT D TYPE LATCHES
WITH 3 STATE OUTPUTS
SCLS140D − DECEMBER 1982 − REVISED AUGUST 2003
recommended operating conditions (see Note 3)
SN54HC373
MIN
VCC
VIH
Supply voltage
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VIL
VI
VO
∆t/∆v
Low-level input voltage
Input voltage
Output voltage
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 4.5 V
VCC = 6 V
0
0
2
1.5
3.15
4.2
0.5
1.35
1.8
VCC
VCC
1000
500
400
0
0
NOM
5
MAX
6
SN74HC373
MIN
2
1.5
3.15
4.2
0.5
1.35
1.8
VCC
VCC
1000
500
400
ns
V
V
V
V
NOM
5
MAX
6
UNIT
V
High-level input voltage
Input transition rise/fall time
TA
Operating free-air temperature
−55
125
−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.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
2V
IOH = −20
µA
VOH
VI = VIH or VIL
IOH = −6 mA
IOH = −7.8 mA
IOL = 20
µA
VOL
VI = VIH or VIL
IOL = 6 mA
IOL = 7.8 mA
II
IOZ
ICC
Ci
VI = VCC or 0
VO = VCC or 0
VI = VCC or 0,
IO = 0
4.5 V
6V
4.5 V
6V
2V
4.5 V
6V
4.5 V
6V
6V
6V
6V
2 V to 6 V
3
TA = 25°C
MIN
TYP
MAX
1.9
4.4
5.9
3.98
5.48
1.998
4.499
5.999
4.3
5.8
0.002
0.001
0.001
0.17
0.15
±0.1
±0.01
0.1
0.1
0.1
0.26
0.26
±100
±0.5
8
10
SN54HC373
MIN
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1000
±10
160
10
MAX
SN74HC373
MIN
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1000
±5
80
10
nA
µA
µA
pF
V
V
MAX
UNIT
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SCLS140D − DECEMBER 1982 − REVISED AUGUST 2003
SN54HC373, SN74HC373
OCTAL TRANSPARENT D TYPE LATCHES
WITH 3 STATE OUTPUTS
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
VCC
2V
tw
Pulse duration, LE high
4.5 V
6V
2V
tsu
Setup time, data before LE↓
4.5 V
6V
2V
th
Hold time, data after LE↓
4.5 V
6V
TA = 25°C
MIN
MAX
80
16
14
50
10
9
20
10
10
SN54HC373
MIN
120
24
20
75
15
13
26
13
13
MAX
SN74HC373
MIN
100
20
17
63
13
11
24
12
12
ns
ns
ns
MAX
UNIT
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
2V
D
tpd
LE
Any Q
Q
4.5 V
6V
2V
4.5 V
6V
2V
ten
OE
Any Q
4.5 V
6V
2V
tdis
OE
Any Q
4.5 V
6V
2V
tt
Any Q
4.5 V
6V
TA = 25°C
MIN
TYP
MAX
58
15
13
73
18
15
65
17
14
50
15
13
28
8
6
150
30
26
175
35
30
150
30
26
150
30
26
60
12
10
SN54HC373
MIN
MAX
225
45
38
265
53
45
225
45
38
225
45
38
90
18
15
SN74HC373
MIN
MAX
190
38
32
220
44
38
190
38
32
190
38
32
75
15
13
ns
ns
ns
ns
UNIT
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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