SN54ACT574, SN74ACT574
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS537C – OCTOBER 1995 – REVISED JANUAR Y 2000
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Inputs Are TTL-Voltage Compatible
D
EPIC
(Enhanced-Performance Implanted
CMOS) 1-µm Process
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK) and
Flatpacks (W), 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. The devices
are particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The eight flip-flops of the ’ACT574 devices are
D-type edge-triggered flip-flops. 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 can be used
to place 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 in a bus-organized system without need
for interface or pullup components.
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.
The SN54ACT574 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74ACT574 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
INPUTS OUTPUT
OE CLK DQ
L↑H H
L↑LL
LH or L X Q0
H X X Z
Copyright 2000, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
EPIC is a trademark of Texas Instruments Incorporated.
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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1D
2D
3D
4D
5D
6D
7D
8D
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLK
SN54ACT574 ...J OR W PACKAGE
SN74ACT574 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
2D
1D
OE
8Q
7Q 1Q
8D
GND
CLK VCC
SN54ACT574 . . . FK PACKAGE
(TOP VIEW)
SN54ACT574, SN74ACT574
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS537C – OCTOBER 1995 – REVISED JANUAR Y 2000
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol†
†This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
OE
1D
2
1D 3
2D 4
3D 5
4D 6
5D
11
CLK
1Q
19
2Q
18
3Q
17
4Q
16
5Q
15
6Q
14
7Q
13
8Q
12
7
6D 8
7D 9
8D
EN
1
C1
logic diagram (positive logic)
OE
CLK
1D 1Q
To Seven Other Channels
1D
C1
1
11
219
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 83°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 af fect 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.
SN54ACT574, SN74ACT574
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS537C – OCTOBER 1995 – REVISED JANUAR Y 2000
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54ACT574 SN74ACT574
UNIT
MIN MAX MIN MAX
UNIT
VCC Supply voltage 4.5 5.5 4.5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.8 0.8 V
VIInput voltage 0 VCC 0 VCC V
VOOutput voltage 0 VCC 0 VCC V
IOH High-level output current –24 –24 mA
IOL Low-level output current 24 24 mA
∆t/∆vInput transition rise or fall rate 0 8 0 8 ns/V
TAOperating 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.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25°C SN54ACT574 SN74ACT574
UNIT
PARAMETER
TEST
CONDITIONS
V
CC MIN TYP MAX MIN MAX MIN MAX
UNIT
IOH =50µA
4.5 V 4.4 4.49 4.4 4.4
I
OH = –
50
µ
A
5.5 V 5.4 5.49 5.4 5.4
VOH
IOH =24mA
4.5 V 3.86 3.7 3.76
V
V
OH
I
OH = –
24
mA
5.5 V 4.86 4.7 4.76
V
IOH = –50 mA†5.5 V 3.85
IOH = –75 mA†5.5 V 3.85
IOL =50µA
4.5 V 0.1 0.1 0.1
I
OL =
50
µ
A
5.5 V 0.1 0.1 0.1
VOL
IOL =24mA
4.5 V 0.36 0.44 0.44
V
V
OL
I
OL =
24
mA
5.5 V 0.36 0.44 0.44
V
IOL = 50 mA†5.5 V 1.65
IOL = 75 mA†5.5 V 1.65
IOZ VO = VCC or GND 5.5 V ±0.25 ±5±2.5 µA
IIVI = VCC or GND 5.5 V ±0.1 ±1±1µA
ICC VI = VCC or GND, IO = 0 5.5 V 4 80 40 µA
∆ICC‡One input at 3.4 V,
Other inputs at GND or VCC 5.5 V 0.6 1.5 1.5 mA
CiVI = VCC or GND 5 V 4.5 pF
†Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
‡This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
timing requirements over recommended operating free-air temperature range, VCC = 5 V ±0.5 V
(unless otherwise noted) (see Figure 1)
TA = 25°C SN54ACT574 SN74ACT574
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
twPulse duration, CLK high or low 3 5 4 ns
tsu Setup time, data before CLK↑2.5 3.5 2.5 ns
thHold time, data after CLK↑1 2 1 ns
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54ACT574, SN74ACT574
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS537C – OCTOBER 1995 – REVISED JANUAR Y 2000
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V ±0.5V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO TA = 25°C SN54ACT574 SN74ACT574
UNIT
PARAMETER
(INPUT) (OUTPUT) MIN TYP MAX MIN MAX MIN MAX
UNIT
fmax 100 110 70 85 MHz
tPLH
CLK
Q
2.5 7 11 1.5 13.5 2 12
ns
tPHL
CLK
Q
2 6.5 10 1.5 12.5 1.5 11
ns
tPZH
OE
Q
2 6.4 9.5 1.5 11 1.5 10
ns
tPZL
OE
Q
2 6 9 1.5 11 1.5 10
ns
tPHZ
OE
Q
2 7 10.5 1.5 12 1.5 11.5
ns
tPLZ
OE
Q
2 5.5 8.5 1.5 10 1.5 9
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
Cpd Power dissipation capacitance CL = 50 pF, f = 1 MHz 40 pF
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
SN54ACT574, SN74ACT574
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS537C – OCTOBER 1995 – REVISED JANUAR Y 2000
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50% VCC
3 V
3 V
0 V
0 V
th
tsu
VOLTAGE WAVEFORMS
Data Input
tPLH tPHL
VOH
VOL
3 V
0 V
Input
Output
Timing Input
50% VCC
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1 2 × VCC
500 Ω
500 Ω
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
Output
W aveform 2
S1 at Open
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
≈VCC
0 V
50% VCC VOL + 0.3 V
50% VCC ≈0 V
Open
VOLTAGE WAVEFORMS
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
Open
TEST S1
3 V
0 V
tw
VOLTAGE WAVEFORMS
Input
VOH – 0.3 V
3 V
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
VOLTAGE WAVEFORMS
1.5 V 1.5 V
1.5 V 1.5 V
1.5 V
1.5 V 1.5 V
1.5 V 1.5 V
Figure 1. Load Circuit and Voltage Waveforms
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Copyright 2000, Texas Instruments Incorporated
