SN54ALS374A, SN54AS374, SN74ALS374A, SN74AS374
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS167C – APRIL 1982 – REVISED NOVEMBER 1999
D
D
D
D
D-Type Flip-Flops in a Single Package With
3-State Bus Driving True Outputs
Full Parallel Access for Loading
Buffered Control Inputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) DIPs
SN54ALS374A, SN54AS374 . . . J PACKAGE
SN74ALS374A, SN74AS374 . . . DW OR N PACKAGE
(TOP VIEW)
description
These octal D-type edge-triggered flip-flops
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.
On the positive transition of the clock (CLK) input,
the Q outputs are set to the logic levels set up at
the data (D) inputs.
A buffered 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 the increased drive
provide the capability to drive bus lines without
interface or pullup components.
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
CLK
SN54ALS374A, SN54AS374 . . . FK PACKAGE
(TOP VIEW)
2D
2Q
3Q
3D
4D
3
4
5
6
7
8
2 1 20 19
18
17
16
15
OE
V
CC
8Q
8D
7D
7Q
6Q
6D
OE does not affect internal operations of the flip-flops. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
The SN54ALS374A and SN54AS374 are characterized for operation over the full military temperature range
of –55°C to 125°C. The SN74ALS374A and SN74AS374 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OE
L
L
L
H
CLK
↑
↑
H or L
X
D
H
L
X
X
OUTPUT
Q
H
L
Q0
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.
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
©
1999, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
4Q
GND
CLK
5Q
5D
1D
1Q
14
9 10 11 12 13
1
SN54ALS374A, SN54AS374, SN74ALS374A, SN74AS374
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS167C – APRIL 1982 – REVISED NOVEMBER 1999
logic symbol
†
OE
CLK
1
11
EN
C1
2
5
6
9
12
15
16
19
logic diagram (positive logic)
OE
CLK
1
11
C1
2
1Q
1D
2D
3D
4D
5D
6D
7D
8D
3
4
7
8
13
14
17
18
1D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
1D
3
1D
To Seven Other Channels
† 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 range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Input voltage range, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 5.5 V
Package thermal impedance,
θ
JA
(see Note 1): DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°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.
NOTE 1: The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions
SN54ALS374A
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
–55
4.5
2
0.7
–1
12
125
0
NOM
5
MAX
5.5
SN74ALS374A
MIN
4.5
2
0.8
–2.6
24
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
°C
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS374A, SN54AS374, SN74ALS374A, SN74AS374
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS167C – APRIL 1982 – REVISED NOVEMBER 1999
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
11
19
20
SN54ALS374A
MIN
TYP†
MAX
–1.5
VCC–2
2.4
VCC–2
3.3
2.4
0.25
0.4
20
–20
0.1
20
–0.2
–112
20
28
31
–30
11
19
20
3.2
0.25
0.35
0.4
0.5
20
–20
0.1
20
–0.2
–112
19
28
31
mA
V
µA
µA
mA
µA
mA
mA
V
SN74ALS374A
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.
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
SN54ALS374A
MIN
fclock
tw
tsu
th
Clock frequency
Pulse duration
Setup time
Hold time
CLK high or low
Data before CLK↑
Data after CLK↑
16.5
10
4
MAX
30
14
10
0
SN74ALS374A
MIN
MAX
35
UNIT
MHz
ns
ns
ns
switching characteristics over recommended operating conditions (unless otherwise noted
(see Figure 3)
PARAMETER
fmax
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
SN54ALS374A
MIN
30
CLK
3
Q
Q
Q
5
3
OE
OE
5
1
2
14
17
18
21
11
19
MAX
SN74ALS374A
MIN
35
3
5
3
5
1
2
12
16
17
18
10
18
MAX
UNIT
MHz
ns
ns
ns
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54ALS374A, SN54AS374, SN74ALS374A, SN74AS374
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS167C – APRIL 1982 – REVISED NOVEMBER 1999
recommended operating conditions
SN54AS374
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
–55
4.5
2
0.7
–12
32
125
0
NOM
5
MAX
5.5
SN74AS374
MIN
4.5
2
0.8
–15
48
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
°C
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,
OE, CLK
Data
VCC = 5 5 V
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
0.4
VO = 2.25 V
Outputs high
Outputs low
Outputs disabled
–30
77
84
84
SN54AS374
MIN
TYP†
MAX
–1.2
VCC–2
2.4
VCC–2
3.2
2.4
0.29
0.5
0.34
50
–50
0.1
20
–0.5
–3
–112
120
128
128
–30
77
84
84
0.5
50
–50
0.1
20
–0.5
–2
–112
120
128
128
mA
3.3
V
µA
µA
mA
µA
mA
mA
V
SN74AS374
MIN
TYP†
MAX
–1.2
UNIT
V
VOL
IOZH
IOZL
II
IIH
IIL
IO‡
ICC
† 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.
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
SN54AS374
MIN
fclock
tw
tsu
th
Clock frequency
Pulse duration
Setup time
Hold time
CLK high
CLK low
Data before CLK↑
Data after CLK↑
5.5*
3*
3*
3*
MAX
100*
4
3
2
2
SN74AS374
MIN
MAX
125
UNIT
MHz
ns
ns
ns
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS374A, SN54AS374, SN74ALS374A, SN74AS374
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS167C – APRIL 1982 – REVISED NOVEMBER 1999
switching characteristics over recommended operating conditions (unless otherwise noted)
(see Figure 3)
PARAMETER
fmax
tPLH
tPHL
tPZH
tPZL
tPHZ
FROM
(INPUT)
TO
(OUTPUT)
SN54AS374
MIN
100*
CLK
3
Q
Q
Q
4
2
OE
OE
3
2
2
11
11.5
7
11
10
7
MAX
SN74AS374
MIN
125
3
4
2
3
2
2
8
9
6
10
6
6
MAX
UNIT
MHz
ns
ns
ns
tPLZ
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
5
