"Octal Edge-Triggered D-Type Flip-Flops With 3-State Outputs"
SN54F374, SN74F374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDFS077A D2932, MARCH 1987 REVISED OCTOBER 1993
Copyright
1993, Texas Instruments Incorporated
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Eight D-Type Flip-Flops in a Single Package
3-State Bus-Driving True Outputs
Full Parallel Access for Loading
Buffered Control Inputs
Package Options Include Plastic
Small-Outline (SOIC) and Shrink
Small-Outline (SSOP) Packages, Ceramic
Chip Carriers, and Plastic and Ceramic
DIPs
description
These 8-bit 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.
The eight flip-flops of the
F374 are edge-triggered
D-type flip-flops. On the positive transition of the
clock (CLK) input, the Q outputs are set to the logic
levels that were set up at 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 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
need for interface or pullup components.
The output enable (OE) input 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.
The SN74F374 is available in TI's shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN54F374 is characterized for operation over the full military temperature range of 55
C to 125
C. The
SN74F374 is characterized for operation from 0
C to 70
C.
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
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
SN54F374 . . . J PACKAGE
SN74F374 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
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
SN54F374 . . . FK PACKAGE
(TOP VIEW)
1D
1Q
OE
5Q
5D
8Q
4Q
GND
CLK
V
CC
8D
7D
7Q
6Q
6D
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.
SN54F374, SN74F374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDFS077A D2932, MARCH 1987 REVISED OCTOBER 1993
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
logic diagram (positive logic)
1D
CLK
1Q
2
11
3
1
1D
C1
OE
OE
EN
1
11
CLK
1D
3
1D
4
2D
7
3D
8
4D
5Q
12
6Q
15
7Q
16
8Q
19
13
5D
14
6D
17
7D
18
8D
1Q
2
2Q
5
3Q
6
4Q
9
C1
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
(see Note 1)
1.2 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range
30 mA to 5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state
0.5 V to 5.5 V
. . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state
0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54F374
40 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F374
48 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range:
SN54F374
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F374
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.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F374
SN74F374
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IIK
Input clamp current
18
18
mA
IOH
High-level output current
3
3
mA
IOL
Low-level output current
20
24
mA
TA
Operating free-air temperature
55
125
0
70
C
SN54F374, SN74F374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDFS077A D2932, MARCH 1987 REVISED OCTOBER 1993
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54F374
SN74F374
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
V
VCC = 4 5 V
IOH = 1 mA
2.5
3.4
2.5
3.4
VOH
VCC = 4.5 V
IOH = 3 mA
2.4
3.3
2.4
3.3
V
VCC = 4.75 V,
IOH = 1 mA to 3 mA
2.7
VOL
VCC = 4 5 V
IOL = 20 mA
0.3
0.5
V
VOL
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
50
50
A
IOZL
VCC = 5.5 V,
VO = 0.5 V
50
50
A
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20
A
IIL
VCC = 5.5 V,
VI = 0.5 V
0.6
0.6
mA
IOS
VCC = 5.5 V,
VO = 0
60
150
60
150
mA
ICCZ
VCC = 5.5 V,
See Note 2
55
86
55
86
mA
All typical values are at VCC = 5 V, TA = 25
C.
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
NOTE 2: ICCZ is measured with OE at 4.5 V and all other inputs grounded.
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
VCC = 5 V,
TA = 25
C
SN54F374
SN74F374
UNIT
F374
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
fclock
Clock frequency
0
100
0
60
0
70
MHz
t
Pulse duration
CLK high
7
7
7
ns
tw
Pulse duration
CLK low
6
6
6
ns
t
Setup time data before CLK
High
2
2.5
2
ns
tsu
Setup time, data before CLK
Low
2
2
2
ns
th
Hold time data after CLK
High
2
2
2
ns
th
Hold time, data after CLK
Low
2
2.5
2
ns
SN54F374, SN74F374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDFS077A D2932, MARCH 1987 REVISED OCTOBER 1993
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Note 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500
,
TA = 25
C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
,
TA = MIN to MAX
UNIT
(INPUT)
(OUTPUT)
F374
SN54F374
SN74F374
MIN
TYP
MAX
MIN
MAX
MIN
MAX
fmax
100
60
70
MHz
tPLH
CLK
Q
3.2
6.1
8.5
3.2
10.5
3.2
10
ns
tPHL
CLK
Q
3.2
6.1
8.5
3.2
11
3.2
10
ns
tPZH
OE
Q
1.2
8.6
11.5
1.2
14
1.2
12.5
ns
tPZL
OE
Q
1.2
5.4
7.5
1.2
10
1.2
8.5
ns
tPHZ
OE
Q
1.2
4.9
7
1.2
8
1.2
8
ns
tPLZ
OE
Q
1.2
3.9
5.5
1.2
7.5
1.2
6.5
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
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accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright
1998, Texas Instruments Incorporated
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