SN54AHC374, SN74AHC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS240I OCTOBER 1995 REVISED JULY 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Operating Range 2-V to 5.5-V V
CC
D
3-State Outputs Drive Bus Lines Directly
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
ESD Protection Exceeds JESD 22
2000-V Human-Body Model (A114-A)
200-V Machine Model (A115-A)
1000-V Charged-Device Model (C101)
SN54AHC374 . . . J OR W PACKAGE
SN74AHC374 . . . DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
SN54AHC374 . . . 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
CLK
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
CLK
V
CC
8D
7D
7Q
6Q
6D
description/ordering information
The 'AHC374 devices are octal edge-triggered D-type flip-flops that feature 3-state outputs designed
specifically for driving highly capacitive or relatively low-impedance loads. These devices 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 of the data (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 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.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP N
Tube
SN74AHC374N
SN74AHC374N
SOIC
DW
Tube
SN74AHC374DW
AHC374
SOIC DW
Tape and reel
SN74AHC374DWR
AHC374
40
C to 85
C
SOP NS
Tape and reel
SN74AHC374NSR
AHC374
40
C to 85
C
SSOP DB
Tape and reel
SN74AHC374DBR
HA374
TSSOP
PW
Tube
SN74AHC374PW
HA374
TSSOP PW
Tape and reel
SN74AHC374PWR
HA374
TVSOP DGV
Tape and reel
SN74AHC374DGVR
HA374
CDIP J
Tube
SNJ54AHC374J
SNJ54AHC374J
55
C to 125
C
CFP W
Tube
SNJ54AHC374W
SNJ54AHC374W
LCCC FK
Tube
SNJ54AHC374FK
SNJ54AHC374FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Copyright
2003, 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.
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.
SN54AHC374, SN74AHC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS240I OCTOBER 1995 REVISED JULY 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
OE does not affect internal operations of the flip-flop. 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.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
OE
CLK
D
Q
L
H
H
L
L
L
L
H or L
X
Q0
H
X
X
Z
logic diagram (positive logic)
OE
To Seven Other Channels
1
11
3
2
CLK
1D
C1
1D
1Q
SN54AHC374, SN74AHC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS240I OCTOBER 1995 REVISED JULY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
25 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
75 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DB package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGV package
92
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.
recommended operating conditions (see Note 3)
SN54AHC374
SN74AHC374
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
2
5.5
2
5.5
V
VCC = 2 V
1.5
1.5
VIH
High-level input voltage
VCC = 3 V
2.1
2.1
V
VCC = 5.5 V
3.85
3.85
VCC = 2 V
0.5
0.5
VIL
Low-level input voltage
VCC = 3 V
0.9
0.9
V
VCC = 5.5 V
1.65
1.65
VI
Input voltage
0
5.5
0
5.5
V
VO
Output voltage
0
VCC
0
VCC
V
VCC = 2 V
50
50
m
A
IOH
High-level output current
VCC = 3.3 V
0.3 V
4
4
mA
VCC = 5 V
0.5 V
8
8
mA
VCC = 2 V
50
50
m
A
IOL
Low-level output current
VCC = 3.3 V
0.3 V
4
4
mA
VCC = 5 V
0.5 V
8
8
mA
t
/
v
Input transition rise or fall rate
VCC = 3.3 V
0.3 V
100
100
ns/V
t
/
v
Input transition rise or fall rate
VCC = 5 V
0.5 V
20
20
ns/V
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.
SN54AHC374, SN74AHC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS240I OCTOBER 1995 REVISED JULY 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
SN54AHC374
SN74AHC374
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
2 V
1.9
2
1.9
1.9
IOH = 50
m
A
3 V
2.9
3
2.9
2.9
VOH
4.5 V
4.4
4.5
4.4
4.4
V
OH
IOH = 4 mA
3 V
2.58
2.48
2.48
IOH = 8 mA
4.5 V
3.94
3.8
3.8
2 V
0.1
0.1
0.1
IOL = 50
m
A
3 V
0.1
0.1
0.1
VOL
4.5 V
0.1
0.1
0.1
V
OL
IOL = 4 mA
3 V
0.36
0.5
0.44
IOL = 8 mA
4.5 V
0.36
0.5
0.44
II
VI = 5.5 V or GND
0 V to 5.5 V
0.1
1*
1
m
A
IOZ
VO = VCC or GND
5.5 V
0.25
2.5
2.5
m
A
ICC
VI = VCC or GND,
IO = 0
5.5 V
4
40
40
m
A
Ci
VI = VCC or GND
5 V
4
10
10
pF
Co
VO = VCC or GND
5 V
6
pF
* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.
timing requirements over recommended operating free-air temperature range, V
CC
= 3.3 V
0.3 V
(unless otherwise noted) (see Figure 1)
TA = 25
C
SN54AHC374
SN74AHC374
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
tw
Pulse duration, CLK high or low
5
5.5
5.5
ns
tsu
Setup time, data before CLK
4.5
4
4
ns
th
Hold time, data after CLK
2
2
2
ns
timing requirements over recommended operating free-air temperature range, V
CC
= 5 V
0.5 V
(unless otherwise noted) (see Figure 1)
TA = 25
C
SN54AHC374
SN74AHC374
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
tw
Pulse duration, CLK high or low
5
5
5
ns
tsu
Setup time, data before CLK
3
3
3
ns
th
Hold time, data after CLK
2
2
2
ns
SN54AHC374, SN74AHC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS240I OCTOBER 1995 REVISED JULY 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V
0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
LOAD
TA = 25
C
SN54AHC374
SN74AHC374
UNIT
PARAMETER
(INPUT)
(OUTPUT)
CAPACITANCE
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
f
CL = 15 pF
80*
130*
70*
70
MHz
fmax
CL = 50 pF
55
85
50
50
MHz
tPLH
CLK
Q
CL = 15 pF
8.1*
12.7*
1*
15*
1
15
ns
tPHL
CLK
Q
CL = 15 pF
8.1*
12.7*
1*
15*
1
15
ns
tPZH
OE
Q
CL = 15 pF
7.1*
11*
1*
13*
1
13
ns
tPZL
OE
Q
CL = 15 pF
7.1*
11*
1*
13*
1
13
ns
tPHZ
OE
Q
CL = 15 pF
7.5*
10.5*
1*
12.5*
1
12.5
ns
tPLZ
OE
Q
CL = 15 pF
7.5*
10.5*
1*
12.5*
1
12.5
ns
tPLH
CLK
Q
CL = 50 pF
10.6
16.2
1
18.5
1
18.5
ns
tPHL
CLK
Q
CL = 50 pF
10.6
16.2
1
18.5
1
18.5
ns
tPZH
OE
Q
CL = 50 pF
9.6
14.5
1
16.5
1
16.5
ns
tPZL
OE
Q
CL = 50 pF
9.6
14.5
1
16.5
1
16.5
ns
tPHZ
OE
Q
CL = 50 pF
10.2
14
1
16
1
16
ns
tPLZ
OE
Q
CL = 50 pF
10.2
14
1
16
1
16
ns
tsk(o)
CL = 50 pF
1.5**
1.5
ns
On products compliant to MIL-PRF-38535, this parameter is not production tested.
On products compliant to MIL-PRF-38535, this parameter does not apply.
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
LOAD
TA = 25
C
SN54AHC374
SN74AHC374
UNIT
PARAMETER
(INPUT)
(OUTPUT)
CAPACITANCE
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
f
CL = 15 pF
130*
185*
110*
110
MHz
fmax
CL = 50 pF
85
120
75
75
MHz
tPLH
CLK
Q
CL = 15 pF
5.4*
8.1*
1*
9.5*
1
9.5
ns
tPHL
CLK
Q
CL = 15 pF
5.4*
8.1*
1*
9.5*
1
9.5
ns
tPZH
OE
Q
CL = 15 pF
5.1*
7.6*
1*
9*
1
9
ns
tPZL
OE
Q
CL = 15 pF
5.1*
7.6*
1*
9*
1
9
ns
tPHZ
OE
Q
CL = 15 pF
4.6*
6.8*
1*
8*
1
8
ns
tPLZ
OE
Q
CL = 15 pF
4.6*
6.8*
1*
8*
1
8
ns
tPLH
CLK
Q
CL = 50 pF
6.9
10.1
1
11.5
1
11.5
ns
tPHL
CLK
Q
CL = 50 pF
6.9
10.1
1
11.5
1
11.5
ns
tPZH
OE
Q
CL = 50 pF
6.6
9.6
1
11
1
11
ns
tPZL
OE
Q
CL = 50 pF
6.6
9.6
1
11
1
11
ns
tPHZ
OE
Q
CL = 50 pF
6.1
8.8
1
10
1
10
ns
tPLZ
OE
Q
CL = 50 pF
6.1
8.8
1
10
1
10
ns
tsk(o)
CL = 50 pF
1**
1
ns
On products compliant to MIL-PRF-38535, this parameter is not production tested.
On products compliant to MIL-PRF-38535, this parameter does not apply.
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