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SN74HC374 Datasheet

OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS


SN74HC374 Datasheet Preview


SN54HC374, SN74HC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS141C – DECEMBER 1982 – REVISED JULY 1998
D Eight D-Type Flip-Flops in a Single Package
D High-Current 3-State True Outputs Can
Drive up to 15 LSTTL Loads
D Full Parallel Access for Loading
D Package Options Include Plastic Shrink
Small-Outline (DB), Small-Outline (DW),
Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 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.
SN54HC374 . . . J OR W PACKAGE
SN74HC374 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
OE
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 8Q
18 8D
17 7D
16 7Q
15 6Q
14 6D
13 5D
12 5Q
11 CLK
SN54HC374 . . . FK PACKAGE
(TOP VIEW)
The eight flip-flops of the ’HC374 devices 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.
An output-enable (OE) input places the eight
2D
3 2 1 20 19
4 18
8D
2Q 5
17 7D
3Q 6
16 7Q
3D 7
15 6Q
4D 8
14 6D
9 10 11 12 13
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 flip-flops. 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 VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN54HC374 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74HC374 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OE CLK D
OUTPUT
Q
LH
H
LL
L
L H or L X
HXX
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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1998, 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.
1
Page 1

SN54HC374, SN74HC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS141C – DECEMBER 1982 – REVISED JULY 1998
logic symbol
OE
CLK
1D
2D
3D
4D
5D
6D
7D
8D
1
11
3
4
7
8
13
14
17
18
EN
C1
1D
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
1Q
5
2Q
6
3Q
9
4Q
12
5Q
15
6Q
16
7Q
19
8Q
logic diagram (positive logic)
OE 1
CLK 11
3
1D
C1
1D
2
1Q
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
Package thermal impedance, θJA (see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115°C/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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, except for through-hole packages, which use a trace
length of zero.
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Page 2

SN54HC374, SN74HC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS141C – DECEMBER 1982 – REVISED JULY 1998
recommended operating conditions (see Note 3)
SN54HC374
MIN NOM MAX
SN74HC374
UNIT
MIN NOM MAX
VCC Supply voltage
VIH High-level input voltage
VIL Low-level input voltage
VI Input voltage
VO Output voltage
tt Input transition (rise and fall) time
TA Operating free-air temperature
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
2 5 6 2 5 6V
1.5 1.5
3.15 3.15
V
4.2 4.2
0 0.5 0 0.5
0 1.35 0 1.35 V
0 1.8 0 1.8
0
VCC
0
VCC V
0
VCC
0
VCC V
0
1000
0
1000
0 500 0 500 ns
0 400 0 400
–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
VOH
VOL
II
IOZ
ICC
Ci
VI = VIH or VIL
IOH = –20 µA
IOH = –6 mA
IOH = –7.8 mA
VI = VIH or VIL
VI = VCC or 0
VO = VCC or 0
VI = VCC or 0,
IOL = 20 µA
IOL = 6 mA
IOL = 7.8 mA
IO = 0
VCC
2V
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
TA = 25°C
MIN TYP MAX
1.9 1.998
4.4 4.499
5.9 5.999
3.98 4.3
5.48 5.8
0.002 0.1
0.001 0.1
0.001 0.1
0.17 0.26
0.15 0.26
±0.1 ±100
±0.01 ±0.5
8
3 10
SN54HC374
MIN MAX
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1000
±10
160
10
SN74HC374
MIN MAX
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1000
±5
80
10
UNIT
V
V
nA
µA
µA
pF
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3
Page 3

SN54HC374, SN74HC374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS141C – DECEMBER 1982 – REVISED JULY 1998
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
fclock Clock frequency
tw Pulse duration, CLK high or low
tsu Setup time, data before CLK
th Hold time, data after CLK
VCC
2V
4.5 V
6V
2V
4.5 V
6V
2V
4.5 V
6V
2V
4.5 V
6V
TA = 25°C
MIN MAX
6
30
35
80
16
14
100
20
17
10
5
5
SN54HC374
MIN MAX
4
20
24
120
24
20
150
30
25
13
5
5
SN74HC374
MIN MAX
5
24
28
100
20
17
125
25
21
12
5
5
UNIT
MHz
ns
ns
ns
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
fmax
tpd
ten
tdis
tt
FROM
(INPUT)
CLK
OE
OE
TO
(OUTPUT)
Any Q
Any Q
Any Q
Any Q
VCC
2V
4.5 V
6V
2V
4.5 V
6V
2V
4.5 V
6V
2V
4.5 V
6V
2V
4.5 V
6V
TA = 25°C
MIN TYP MAX
6 12
30 60
35 70
63 180
17 36
15 31
60 150
16 30
14 26
36 150
17 30
16 26
28 60
8 12
6 10
SN54HC374
MIN MAX
4
20
24
270
54
46
225
45
38
225
45
38
90
18
15
SN74HC374
MIN MAX
5
24
28
225
45
38
190
38
32
190
38
32
75
15
13
UNIT
MHz
ns
ns
ns
ns
4 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Page 4
Part Number SN74HC374
Manufactur Texas
Description OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS
Total Page 7 Pages
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