Motorola MC74F194N, MC74F194D, MC74F194J Datasheet

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 (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.

14 13 12 11 10 9

1 2 3 4 5 6

16 15

Q0Q1Q2Q

CP S

DSRP0P1P2P3DSLGND

CONNECTION DIAGRAM

FUNCTION TABLE

Operating

Inputs Outputs

Operating

Mode

MR S1S0D

SRDSLPnQ0Q1Q2Q3

Reset L X X X X X L L L L Hold H I I X X X q0q1q2q

H h I X I X q1q2q3L

Shift Left

H h I X h X q1q2q3H H I h I X X L q0q1q

Shift Right

H I h h X X H q0q1q

Parallel Load H h h X X pnp0p1p2p

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 SCHOTTKY TTL

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

ORDERING INFORMATION

MC74FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXD SOIC

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 Q

CP S1S

4-102

FAST AND LS TTL DATA

MC74F194

LOGIC DIAGRAM

S Q

CP R

CLEAR

S Q

CP R

CLEAR

S Q

CP R

CLEAR

S Q

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

Supply Voltage 74 4.5 5.0 5.5 V

Operating Ambient Temperature Range 74 0 25 70 °C

Output Current — High 74 –1.0 mA

Output Current — Low 74 20 mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min Typ Max

Unit

Test Conditions

Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage

Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage

Input Clamp Diode Voltage –1.2 V IIN = –18 mA VCC = MIN

74 2.5 3.4 V IOH = –1.0 mA VCC = 4.5 V

VOHOutput HIGH Voltage

74 2.7 3.4 V IOH = –1.0 mA VCC = 4.75 V

Output LOW Voltage 0.35 0.5 V IOL = 20 mA VCC = MIN

20 µA VIN = 2.7 V

IIHInput HIGH Current

100 µA VIN = 7.0 V

VCC = MAX

Input LOW Current –0.6 mA VIN = 0.5 V VCC = MAX

Output Short Circuit Current (Note 2) –60 –150 mA V

OUT

= 0 V VCC = MAX

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.

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