MC74F194 Datasheet, PDF (1/3 Pages) Motorola, Inc – 4-BIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTER

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 (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.
CONNECTION DIAGRAM
VCC Q0 Q1 Q2 Q3 CP S1 S0
16 15 14 13 12 11 10 9
1 2 3 4 56 78
MR DSR P0 P1 P2 P3 DSL GND
FUNCTION TABLE
Operating
Mode
Reset
Inputs
MR S1 S0 DSR
L XX X
DSL
X
Outputs
Pn Q0 Q1 Q2 Q3
XLLLL
Hold
HII X
X X q0 q1 q2 q3
Shift Left
HhI X
HhI X
I
X q1 q2 q3 L
h X q1 q2 q3 H
Shift Right
HIh I
HIh h
X X L q0 q1 q2
X X H q0 q1 q2
Parallel Load
Hhh 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
FAST AND LS TTL DATA
4-101
MC74F194
4-BIT BIDIRECTIONAL
UNIVERSAL SHIFT REGISTER
FAST™ SCHOTTKY TTL
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
MC74FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
11 10 9
CP S1 S0
1
MR
DSR
2
15
Q0
14
Q1
13
Q2
P0 3
P1 4
P2 5
P3 6
12
Q3
DSL
7
VCC = PIN 16
GND = PIN 8