SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
•
•
•
•
•
3-State Buffer-Type Outputs Drive Bus
Lines Directly
Bus-Structured Pinout
Choice of True or Inverting Logic
– SN54ALS874B, SN74ALS874B,
SN74AS874 Have True Outputs
– SN74ALS876A, SN74AS876 Have
Inverting Outputs
Asynchronous Clear
Package Options Include Plastic
Small-Outline (DW) Packages, Plastic (FN)
and Ceramic (FK) Chip Carriers, and
Standard Plastic (NT) and Ceramic (JT)
300-mil DIPs
SN54ALS874B . . . JT PACKAGE
SN74ALS874B, SN74AS874 . . . DW OR NT PACKAGE
(TOP VIEW)
1CLR
1OE
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OE
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2CLR
description
These dual 4-bit D-type edge-triggered flip-flops
feature 3-state outputs designed specifically as
bus drivers. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
The edge-triggered flip-flops enter data on the
low-to-high transition of the clock (CLK) input.
The SN54ALS874B, SN74ALS874B, and
SN74AS874 have clear (CLR) inputs and
noninverting Q outputs. The SN74ALS876A and
SN74AS876 have preset (PRE) inputs and
inverting Q outputs; taking PRE low causes the
four Q or Q outputs to go low independently of the
clock.
The SN54ALS874B is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74ALS874B, SN74ALS876A,
SN74AS874, and SN74AS876 devices are
characterized for operation from 0°C to 70°C.
SN54ALS874B . . . FK PACKAGE
(TOP VIEW)
1D2
1D3
1D4
NC
2D1
2D2
2D3
5
6
7
8
9
4
1D1
1OE
1CLR
NC
VCC
1CLK
1Q1
3 2 1 28 27 26
25
24
23
22
21
20
10
19
11
12 13 14 15 16 17 18
1Q2
1Q3
1Q4
NC
2Q1
2Q2
2Q3
NC – No internal connection
SN74ALS876A, SN74AS876 . . . DW OR NT PACKAGE
(TOP VIEW)
1PRE
1OE
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OE
GND
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
2D4
2OE
GND
NC
2CLR
2CLK
2Q4
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2PRE
Copyright
©
1995, Texas Instruments Incorporated
1
SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
Function Tables
SN54ALS874B, SN74ALS874B, SN74AS874
(each flip-flop)
INPUTS
OE
L
L
L
L
H
CLR
L
H
H
H
X
CLK
X
↑
↑
L
X
D
X
H
L
X
X
OUTPUT
Q
L
H
L
Q0
Z
SN74ALS876A, SN74AS876
(each flip-flop)
INPUTS
OE
L
L
L
L
H
PRE
L
H
H
H
X
CLK
X
↑
↑
L
X
D
X
H
L
X
X
OUTPUT
Q
L
L
H
Q0
Z
logic symbols
†
SN54ALS874B, SN74ALS874B, SN74AS874
1OE
1CLK
1CLR
1D1
1D2
1D3
1D4
2
23
1
3
4
5
6
R
1D
22
21
20
19
1Q1
1Q2
1Q3
1Q4
EN
C1
1OE
1CLK
1PRE
1D1
1D2
1D3
1D4
2
23
1
3
4
5
6
S
1D
22
21
20
19
1Q1
1Q2
1Q3
1Q4
SN74ALS876A, SN74AS876
EN
C1
2OE
2CLK
2CLR
2D1
2D2
2D3
2D4
11
14
13
7
8
9
10
EN
C1
R
1D
18
17
16
15
2Q1
2Q2
2Q3
2Q4
2OE
2CLK
2PRE
2D1
2D2
2D3
2D4
11
14
13
7
8
9
10
EN
C1
S
1D
18
17
16
15
2Q2
2Q3
2Q4
2Q1
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DW, JT, and NT packages.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
logic diagrams (positive logic)
SN54ALS874B, SN74ALS874B, SN74AS874
(each quad flip-flop)
OE
OE
SN74ALS876A, SN74AS876
(each quad flip-flop)
CLK
CLK
CLR
R
C1
D1
1D
R
C1
D2
1D
R
C1
D3
1D
Q3
Q2
Q1
PRE
S
C1
D1
1D
S
C1
D2
1D
S
C1
D3
1D
Q3
Q2
Q1
R
C1
D4
1D
Q4
D4
S
C1
1D
Q4
Pin numbers shown are for the DW, JT, and NT packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T
A
: SN54ALS874B . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74ALS874B, SN74ALS876A . . . . . . . . . . . . . . . . . 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
recommended operating conditions
SN54ALS874B
MIN
VCC
VIH
VIL
IOH
IOL
fclock
tw
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Clock frequency
PRE or CLR low
Pulse duration
CLK high
CLK low
tsu
th
TA
Data
Set p time before CLK↑
Setup
Hold time, data after CLK↑
Operating free-air temperature
PRE or CLR inactive
0
15
20
20
15
15
4
– 55
125
4.5
2
0.7
–1
12
25
0
10
16.5
16.5
15
10
0
0
70
ns
ns
°C
ns
NOM
5
MAX
5.5
SN74ALS874B
SN74ALS876A
MIN
4.5
2
0.8
– 2.6
24
30
NOM
5
MAX
5.5
V
V
V
mA
mA
MHz
UNIT
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,
′ALS874B
ICC
SN74ALS876A
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
Outputs low
Outputs disabled
Outputs high
Outputs low
Outputs disabled
– 20
14
19
20
SN54ALS874B
MIN
VCC – 2
2.4
TYP†
MAX
– 1.2
VCC – 2
3.3
2.4
0.25
0.4
20
– 20
0.1
20
– 0.2
– 112
21
30
32
– 30
14
19
20
14
18
20
3.2
0.25
0.35
0.4
0.5
20
– 20
0.1
20
– 0.2
– 112
21
30
32
21
29
31
mA
V
µA
µA
mA
µA
mA
mA
V
SN74ALS874B
SN74ALS876A
MIN
TYP†
MAX
– 1.2
V
UNIT
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.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω
,
R2 = 500
Ω
,
TA = MIN to MAX†
SN54ALS874B
MIN
fmax
tPLH
tPHL
tPHL
tPZH
tPZL
tPHZ
CLK
CLR
OE
OE
Any
An Q
Any Q
Any
An Q
Any Q
25
4
4
5
4
4
2
18
16
23
24
21
15
MAX
SN74ALS874B
MIN
30
4
4
5
4
4
2
3
14
14
17
18
18
10
12
MAX
MHz
ns
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
tPLZ
3
22
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω
,
R2 = 500
Ω
,
TA = MIN to MAX†
SN74ALS876A
MIN
fmax
tPLH
tPHL
tPHL
tPZH
tPZL
tPHZ
30
CLK
PRE
OE
OE
4
Any
An Q
Any Q
An Q
Any
Any Q
4
6
4
4
2
14
14
19
18
18
10
13
MAX
MHz
ns
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
tPLZ
3
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, T
A
: SN74AS874, SN74AS876 . . . . . . . . . . . . . . . . . . . . . . 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
