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Part Number MC74F194

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4-101
FAST AND LS TTL DATA
4-BIT BIDIRECTIONAL
UNIVERSAL SHIFT REGISTER
The MC74F194 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
F194 is similar in operation to the S195 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 F194 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 Function Table. Signals on the Select,
Parallel data (P0­P3) 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.
14
13
12
11
10
9
1
2
3
4
5
6
7
16
15
8
VCC
MR
Q0
Q1
Q2
Q3
S1
CP
S0
DSR
P0
P1
P2
P3
DSL GND
CONNECTION DIAGRAM
FUNCTION TABLE
Operating
Mode
Inputs
Outputs
Operating
Mode
MR
S1 S0 DSR
DSL
Pn
Q0 Q1 Q2 Q3
Reset
L
X
X
X
X
X
L
L
L
L
Hold
H
I
I
X
X
X
q0
q1
q2
q3
Shift Left
H
h
I
X
I
X
q1
q2
q3
L
Shift Left
H
h
I
X
h
X
q1
q2
q3
H
Shift Right
H
I
h
I
X
X
L
q0
q1
q2
Shift Right
H
I
h
h
X
X
H
q0
q1
q2
Parallel Load
H
h
h
X
X
pn
p0
p1
p2
p3
I = 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
MC74F194
4-BIT BIDIRECTIONAL
UNIVERSAL SHIFT REGISTER
FAST
TM
SCHOTTKY TTL
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
MC74FXXXJ
Ceramic
MC74FXXXN
Plastic
MC74FXXXD
SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
VCC = PIN 16
GND = PIN 8
11 10 9
2
3
4
5
6
7
1
15
14
13
12
MR
Q0
Q1
Q2
Q3
DSR
P0
P1
P2
P3
DSL
CP S1 S0
4-102
FAST AND LS TTL DATA
MC74F194
LOGIC DIAGRAM
S1
S0
DSR
CP
MR
Q0
Q1
Q2
Q3
P0
P1
P2
P3
DSR
S
Q0
CP
R
CLEAR
S
Q1
CP
R
CLEAR
S
Q2
CP
R
CLEAR
S
Q3
CP
R
CLEAR
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate
propagation delays.
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
74
0
25
70
°
C
IOH
Output Current -- High
74
­ 1.0
mA
IOL
Output Current -- Low
74
20
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage
VIK
Input Clamp Diode Voltage
­ 1.2
V
IIN = ­18 mA
VCC = MIN
VOH
Output HIGH Voltage
74
2.5
3.4
V
IOH = ­1.0 mA
VCC = 4.5 V
VOH
Output HIGH Voltage
74
2.7
3.4
V
IOH = ­1.0 mA
VCC = 4.75 V
VOL
Output LOW Voltage
0.35
0.5
V
IOL = 20 mA
VCC = MIN
IIH
Input HIGH Current
20
µ
A
VIN = 2.7 V
VCC = MAX
IIH
Input HIGH Current
100
µ
A
VIN = 7.0 V
VCC = MAX
IIL
Input LOW Current
­ 0.6
mA
VIN = 0.5 V
VCC = MAX
IOS
Output Short Circuit Current (Note 2)
­ 60
­150
mA
VOUT = 0 V
VCC = MAX
ICC
Power Supply Current
33
46
mA
Sn, MR, DSR,
DSL = 4.5 V
Pn = Gnd,
CP =
VCC = MAX
NOTES:
1. For conditions such as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
4-103
FAST AND LS TTL DATA
MC74F194
AC CHARACTERISTICS
74F
74F
TA = +25
°
C
TA = 0 to +70
°
C
VCC = +5.0 V
VCC = 5.0 V
±
10%
CL = 50 pF
CL = 50 pF
Symbol
Parameter
Min
Max
Min
Max
Unit
fmax
Maximum Shift Frequency
105
90
MHz
tPLH
Propagation Delay
3.0
7.0
3.5
8.0
ns
tPHL
CP to Qn
3.5
7.5
3.5
8.0
ns
tPHL
Propagation Delay
MR to Qn
4.5
12
4.5
14
ns
AC OPERATING REQUIREMENTS
74F
74F
TA = +25
°
C
TA = 0 to +70
°
C
VCC = +5.0 V
VCC = 5.0 V
±
10%
Symbol
Parameter
Min
Max
Min
Max
Unit
ts(H)
ts(L)
Set up Time, HIGH or LOW
Pn or DSR or DSL to CP
4.0
4.0
4.0
4.0
ns
th(H)
Hold Time, HIGH or LOW
0
1.0
ns
th(L)
Pn or DSR or DSL to CP
0
1.0
ts(H)
ts(L)
Set up Time, HIGH or LOW
Sn to CP
8.0
8.0
9.0
8.0
ns
th(H)
th(L)
Hold Time, HIGH or LOW
Sn to CP
0
0
0
0
ns
tw(H)
CP Pulse Width HIGH
5.0
5.5
ns
tw(L)
MR Pulse Width LOW
5.0
5.0
ns
trec
Recovery Time
MR to CP
7.0
8.0
ns