Page 1
5-1
FACT DATA
The MC74AC194/74ACT194 is a high-speed 4-bit bidirectional universal shift
register. As a high-speed multifunctional, sequential building block, it is useful in
a wide variety of applications. It may be used in serial-serial, shift left, shift right,
serial-parallel, parallel-serial, and parallel-parallel data register transfers. The
′AC/ACT194 is similar in operation to the ′AS195 universal shift register, with
added features of shift left without external connections and hold (do nothing)
modes of operation.
• Typical Shift Frequency of 150 MHz
• Asynchronous Master Reset
• Hold (Do Nothing) Mode
• Fully Synchronous Serial or Parallel Data Transfers
FUNCTIONAL DESCRIPTION
The MC74AC/74ACT194 contains four edge-triggered D flip-flops and the
necessary interstage logic to synchronously perform shift right, shift left, parallel
load and hold operations. Signals applied to the Select (S0, S1) inputs
determine the type of operation, as shown in the Mode Select Table. Signals
on the Select, Parallel data (P0–P3) and Serial data (DSR, DSL) inputs can
change when the clock is in either state, provided only that the recommended
setup and hold times, with respect to the clock rising edge, are observed. A
LOW signal on Master Reset (MR
) overrides all other inputs and forces the
outputs LOW.
MODE SELECT TABLE
Operating
Inputs Outputs
Operating
Mode
MR S1S0D
SRDSLPn
Q0Q1Q2Q
3
Reset L X X X X X L L L L
Hold H l l X X X q0q1q2q
3
H h l X l X q1q2q
3
L
Shift Left
H h l X h X q1q2q3H
H l h l X X L q0q1q
2
Shift Right
H l h h X X H q0q1q
2
Parallel Load H h h X X pnp0p1p2p
3
l = LOW voltage level one setup time prior to the LOW-to-HIGH clock transition.
h = HIGH voltage level one setup time prior to the LOW-to-HIGH clock transition.
Pn (qn) = Lower case letters indicate the state of the referenced input (or output) one setup
time prior to the LOW-to-HIGH clock transition.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
4-BIT BIDIRECTIONAL
UNIVERSAL SHIFT
REGISTER
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
1
2 3 4 5 6 7
12131415
9
10
11
MR
CP
S
1
S
0
DSRP0P1P2P3D
SL
Q0Q1Q2Q
3
V
CC
GND
D
SL
P
3
P
2
P
1
15
16
14
12
11
10
2
1
3
4
5
6
7
98
P
0
D
SR
MR
S
0
S
1
CP
Q
3
Q
2
Q
1
Q
0
13
查询MC74AC194供应商
Page 2
MC74AC194 MC74ACT194
5-2
FACT DATA
D
SR
P
0
P
2
P
3
D
SR
Q
0
Q
1
Q
2
Q
3
CP
S
1
S
0
P
1
MR
CP
R
S Q
0
CLEAR
CP
R
S Q
1
CLEAR
CP
R
S Q
2
CLEAR
CP
R
S Q
3
CLEAR
LOGIC DIAGRAM
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V
V
in
DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V
V
out
DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V
I
in
DC Input Current, per Pin ±20 mA
I
out
DC Output Sink/Source Current, per Pin ±50 mA
I
CC
DC VCC or GND Current per Output Pin ±50 mA
T
stg
Storage Temperature –65 to +150 °C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
Page 3
MC74AC194 MC74ACT194
5-3
FACT DATA
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Typ Max Unit
′AC 2.0 5.0 6.0
VCCSupply Voltage
′ACT 4.5 5.0 5.5
V
Vin, V
out
DC Input Voltage, Output Voltage (Ref. to GND) 0 V
CC
V
VCC @ 3.0 V 150
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
VCC @ 4.5 V 40 ns/V
r
, t
f
′AC Devices except Schmitt Inputs
VCC @ 5.5 V 25
VCC @ 4.5 V 10
tr, t
f
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
VCC @ 5.5 V 8.0
ns/V
T
J
Junction Temperature (PDIP) 140 °C
T
A
Operating Ambient Temperature Range –40 25 85 °C
I
OH
Output Current — High –24 mA
I
OL
Output Current — Low 24 mA
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
DC CHARACTERISTICS
74AC 74AC
Symbol
Parameter
V
CC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
V
IH
3.0 1.5 2.1 2.1 V
OUT
= 0.1 V
4.5 2.25 3.15 3.15 V or VCC – 0.1 V
5.5 2.75 3.85 3.85
V
IL
3.0 1.5 0.9 0.9 V
OUT
= 0.1 V
4.5 2.25 1.35 1.35 V or VCC – 0.1 V
5.5 2.75 1.65 1.65
V
OH
3.0 2.99 2.9 2.9 I
OUT
= –50 µA
4.5 4.49 4.4 4.4 V
5.5 5.49 5.4 5.4
*VIN = VIL or V
IH
3.0 2.56 2.46
–12 mA
4.5 3.86 3.76
V
I
OH
–24 mA
5.5 4.86 4.76 –24 mA
V
OL
3.0 0.002 0.1 0.1 I
OUT
= 50 µA
4.5 0.001 0.1 0.1 V
5.5 0.001 0.1 0.1
*VIN = VIL or V
IH
3.0 0.36 0.44
12 mA
4.5 0.36 0.44
V
I
OL
24 mA
5.5 0.36 0.44 24 mA
I
IN
5.5
±0.1
±1.0
µA
VI = VCC, GND
I
OLD
5.5 75 mA V
OLD
= 1.65 V Max
I
OHD
Output Current
5.5 –75 mA V
OHD
= 3.85 V Min
I
CC
5.5
8.080µA
VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
tr, t
f
Input Rise and Fall Time (Note 2)
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
Maximum Low Level
Output Voltage
Maximum Input
Leakage Current
†Minimum Dynamic
Maximum Quiescent
Supply Current
Page 4
MC74AC194 MC74ACT194
5-4
FACT DATA
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74AC 74AC
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Max Min Max
Maximum Input
3.3 130 115
f
max
Frequency 5.0 210 150
MHz
3-3
Propagation Delay
3.3 2.0 14.5 1.5 16.0
t
PLH
CP to Q 5.0 2.0 12.5 1.5 14.0
ns
3-6
Propagation Delay
3.3 2.0 14.5 1.5 16.0
t
PHL
CP to Q 5.0 2.0 12.5 1.5 14.0
ns
3-6
Propagation Delay
3.3 2.0 11.0 1.5 12.0
t
PHL
Reset to Q 5.0 2.0 9.0 1.5 10.0
ns
3-6
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
AC OPERATING REQUIREMENTS
74AC 74AC
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Guaranteed Minimum
Setup Time, 3.3 4.0 5.0
t
s
Pn to Clock 5.0 2.5 3.5
ns
3-9
3.3 3.5 4.0
t
h
5.0 2.0 2.5
ns
3-9
3.3 5.5 6.5
tsSetup Time, Sn to CP
5.0 4.0 5.0
ns
3-9
3.3 3.5 4.0
t
h
5.0 2.0 2.5
ns
3-9
3.3 5.5 6.0
t
s
5.0 4.0 4.5
ns
3-9
3.3 1.5 2.0
t
h
5.0 2.0 2.5
ns
3-9
3.3 5.5 6.0
twCP Pulse Width
5.0 4.0 4.5
ns
3-6
3.3 5.5 6.0
t
w
MR Pulse Width
5.0 4.0 4.5
ns
3-9
Recovery TIme 3.3 1.5 1.5
t
rec
MR to CP 5.0 1.0 1.0
ns
3-9
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
Hold Time,
Pn to Clock
Hold Time,
Sn to CP
Setup Time,
DSR or DSL to Clock
Hold Time,
DSR or DSL to Clock
Page 5
MC74AC194 MC74ACT194
5-5
FACT DATA
DC CHARACTERISTICS
74ACT 74ACT
Symbol
Parameter
V
CC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
V
IH
4.5 1.5 2.0 2.0
V
OUT
= 0.1 V
5.5 1.5 2.0 2.0
V
or VCC – 0.1 V
V
IL
4.5 1.5 0.8 0.8
V
OUT
= 0.1 V
5.5 1.5 0.8 0.8
V
or VCC – 0.1 V
V
OH
4.5 4.49 4.4 4.4
I
OUT
= –50 µA
5.5 5.49 5.4 5.4
V
*VIN = VIL or V
IH
4.5 3.86 3.76 V
–24 mA
5.5 4.86 4.76
I
OH
–24 mA
V
OL
4.5 0.001 0.1 0.1
I
OUT
= 50 µA
5.5 0.001 0.1 0.1
V
*VIN = VIL or V
IH
4.5 0.36 0.44 V
24 mA
5.5 0.36 0.44
I
OL
24 mA
I
IN
5.5
±0.1
±1.0
µA
VI = VCC, GND
∆I
CCT
Additional Max. ICC/Input 5.5 0.6 1.5 mA VI = VCC – 2.1 V
I
OLD
5.5 75 mA V
OLD
= 1.65 V Max
I
OHD
Output Current
5.5 –75 mA V
OHD
= 3.85 V Min
I
CC
5.5
8.080µA
VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74ACT 74ACT
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Typ Max Min Max
Maximum Input
f
max
Frequency
5.0
210
150
MHz
3-3
Propagation Delay
t
PLH
CP to Q
5.0
2.0
13.0
1.5
13.5ns3-6
Propagation Delay
t
PHL
CP to Q
5.0
2.0
12.5
1.5
14.0ns3-6
Propagation Delay
t
PHL
MR to Q
5.0
2.0
12.5
1.5
14.0ns3-6
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
Maximum Low Level
Output Voltage
Maximum Input
Leakage Current
†Minimum Dynamic
Maximum Quiescent
Supply Current
Page 6
MC74AC194 MC74ACT194
5-6
FACT DATA
AC OPERATING REQUIREMENTS
74ACT 74ACT
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Guaranteed Minimum
Setup Time,
t
s
Pn to CP
5.0
2.5
3.5
ns
3-9
thHold Time, Pn to CP
5.0
1.5
2.0
ns
3-9
tsSetup Time, Sn to CP
5.0
3.5
4.5
ns
3-9
t
h
5.0
1.5
2.0
ns
3-9
t
s
5.0
5.0
5.5
ns
3-9
t
h
5.0
1.5
2.0
ns
3-9
twCP Pulse Width
5.0
4.0
4.5
ns
3-9
t
w
MR Pulse Width, LOW 5.0 4.0 4.5 ns 3-9
Recovery Time
t
rec
MR to CP
5.0
1.0
1.5
ns
3-9
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
CAPACITANCE
Symbol Parameter
Value
Typ
Unit Test Conditions
C
IN
Input Capacitance 4.5 pF VCC = 5.0 V
C
PD
Power Dissipation Capacitance 125.0 pF VCC = 5.0 V
Hold Time,
Sn to CP
Setup Time,
DSR or DSL to Clock
Hold Time,
DSR or DSL to Clock
Page 7
MC74AC194 MC74ACT194
5-7
FACT DATA
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC DIP PACKAGE
CASE 648–08
ISSUE R
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
1 8
16 9
SEATING
PLANE
F
J
M
R
X 45
_
G
8 PLP
–B–
–A–
M
0.25 (0.010) B
S
–T–
D
K
C
16 PL
S
B
M
0.25 (0.010) A
S
T
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
_ _ _ _
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
–A–
B
F
C
S
H
G
D
J
L
M
16 PL
SEATING
1 8
916
K
PLANE
–T–
M
A
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01
____
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MC74AC194/D
*MC74AC194/D*
◊
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