4-193

FAST AND LS TTL DATA

MC54/74F399

FUNCTIONAL DESCRIPTION

The MC54/74F398 is a high-speed quad 2-port register. It

will select four bits of data from either of two sources (Ports)

under control of a common Select input (S). The selected data

is transferred to a 4-bit output register synchronous with the

LOW-to-HIGH transition of the Clock input (CP). The 4-bit D-

type output register is fully edge-triggered. The Data inputs

(I0x, I1x) and Select input (S) must be stable only a setup time

prior to and hold time after the LOW-to-HIGH transition of the

Clock input for predictable operation.

Inputs

Output

S

I0

I1

Q

I

I

h

h

I

h

X

X

X

X

I

h

L

H

L

H

H = HIGH Voltage Level

L = LOW Voltage Level

h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition

I = LOW Voltage Level one setup time prior to the LOW-to-HIGH clock transition

X = Don’t Care

FUNCTION TABLE

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54, 74

4.5

5.0

5.5

V

TA

Operating Ambient Temperature Range

54

–55

25

125

°C

74

0

25

70

IOH

Output Current

 High

54, 74

– 1.0

mA

IOL

Output Current

 Low

54, 74

20

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

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

54, 74

2.5

3.4

V

IOH = – 1.0 mA

VCC = 4.5 V

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

µA

VIN = 2.7 V

VCC = MAX

100

µA

VIN = 7.0 V

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

22

34

mA

VCC = MAX

VIN = GND

CP =

NOTES:

1. For conditions shown 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.