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MC74AC194 Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC74AC194
Beschreibung 4-Bit Bidirectional Universal Shift Register
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 7 Seiten
MC74AC194 Datasheet, Funktion
www.DataSheet4U.com
4ĆBit Bidirectional
Universal Shift Register
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
Mode
Reset
MR S1
LX
Inputs
S0 DSR
XX
DSL Pn
XX
Outputs
Q0 Q1 Q2 Q3
LLLL
Hold
Hl
l
Shift Left
Hh
Hh
l
l
Shift Right
Hl h
Hl h
Parallel Load H h h
X X X q0 q1 q2 q3
X l X q1 q2 q3 L
X h X q1 q2 q3 H
l X X L q0 q1 q2
h X X H q0 q1 q2
X X pn p0 p1 p2 p3
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
FACT DATA
5-1
MC74AC194
MC74ACT194
4-BIT BIDIRECTIONAL
UNIVERSAL SHIFT
REGISTER
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
MR 1
16 VCC
DSR 2
15 Q0
P0 3
P1 4
14 Q1
13 Q2
P2 5
12 Q3
P3 6
11 CP
7
DSL
8
GND
10 S1
9 S0
2 34 56 7
9 S0DSR P0 P1 P2 P3 DSL
10 S1
11 CP MR Q0 Q1 Q2 Q3
1 15 14 13 12






MC74AC194 Datasheet, Funktion
MC74AC194 MC74ACT194
AC OPERATING REQUIREMENTS
Symbol
Parameter
ts
Setup Time,
Pn to CP
th Hold Time, Pn to CP
ts Setup Time, Sn to CP
th
Hold Time,
Sn to CP
ts
Setup Time,
DSR or DSL to Clock
th
Hold Time,
DSR or DSL to Clock
tw CP Pulse Width
tw MR Pulse Width, LOW
trec
Recovery Time
MR to CP
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
VCC*
(V)
74ACT
74ACT
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Guaranteed Minimum
5.0 2.5
3.5
5.0 1.5
5.0 3.5
2.0
4.5
5.0 1.5
2.0
Unit
ns
ns
ns
ns
5.0 5.0
5.5 ns
5.0 1.5
5.0 4.0
5.0 4.0
5.0 1.0
2.0 ns
4.5 ns
4.5 ns
1.5 ns
Fig.
No.
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
CAPACITANCE
Symbol
Parameter
CIN
CPD
Input Capacitance
Power Dissipation Capacitance
Value
Typ
4.5
125.0
Unit
pF
pF
Test Conditions
VCC = 5.0 V
VCC = 5.0 V
FACT DATA
5-6

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