Fairchild 5497, DM7497 service manual

查询5497供应商

5497/DM7497
Synchronous Modulo-64 Bit Rate Multiplier

General Description

The ’97 contains a synchronous 6-stage binary counter and
six decoding gates that serve to gate the clock through to
the output at a sub-multiple of the input frequency. The out­put pulse rate, relative to the clock frequency, is determined
by signals applied to the Select (S0 –S5) inputs. Both true
and complement outputs are available, along with an enable
input for each. A Count Enable input and a Terminal Count
output are provided for cascading two or more packages.
An asynchronous Master Reset input prevents counting and
resets the counter.

5497/DM7497 Synchronous Modulo-64 Bit Rate Multiplier

June 1989

Connection Diagram

Dual-In-Line Package

Order Number 5497DMQB, 5497FMQB or DM7497N

See NS Package Number J16A, N16E or W16A

Pin Names Description

S0–S5 Rate Select Inputs
E

Z

E

Y

CE
CP Clock Pulse Input (Active Rising Edge)
MR Asynchronous Master Reset Input (Active HIGH)
O

Z

O

y

TC

OZEnable Input (Active LOW)
OYEnable Input
Count Enable Input (Active LOW)

Gated Clock Output (Active LOW)
Complement Output (Active HIGH)
Terminal Count Output (Active LOW)

TL/F/9780– 1

Logic Symbol

V

CC

GND

e

e

Pin 16

Pin 8

TL/F/9780– 2

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/F/9780

Absolute Maximum Ratings (Note)

The ‘‘Absolute Maximum Ratings’’ are those values

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 5.5V

Operating Free Air Temperature Range

54
DM74 0

Storage Temperature Range

b

55§Ctoa125§C

Ctoa70§C

§

b

65§Ctoa150§C

Note:

beyond which the safety of the device cannot be guaran­teed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for acutual device operation.

Recommended Operating Conditions

Symbol Parameter

V

CC

V

IH

V

IL

I

OH

I

OL

T

A

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

High Level Input Voltage 2 2 V

Low Level Input Voltage 0.8 0.8 V

High Level Output Current

Low Level Output Current 16 16 mA

Free Air Operating Temperature

Min Nom Max Min Nom Max

b

ts(L) Setup Time LOW, CE to CP Rising 25 25 ns

th(H) Hold Time HIGH, CE to CP Rising 0 0 ns

th(L) Hold Time LOW, CE to CP Falling 0 0 ns

tw(H) CP Pulse Width HIGH 20 20 ns

tw(L) CP Pulse Width LOW 20 ns

tw(H) MR Pulse Width HIGH 15 15 ns

5497 DM7497

b

0.4

b

55 125 0 70

Units

0.4 mA

C

§

Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

e

V

I

V

OH

V

OL

I

I

I

IH

I

IL

I

OS

I

CC

Input Clamp Voltage V

High Level Output V
Voltage V

Low Level Output V
Voltage V

Input Current@Max V
Input Voltage

High Level Input Current V

Low Level Input Current V

Short Circuit V
Output Current (Note 2)

Supply Current With V
Outputs High

CC

CC

e

IL

CC

e

IH

CC

CC

Clock Inputs

CC

Clock Inputs

CC

CC

eb

Min, I

e

Min, I

Max

e

Min, I

Min

e

Max, V

e

Max, V

e

Max, V

e

Max 54

e

Max

12 mA

I

e

Max,

OH

e

Max,

OL

e

5.5V

I

e

2.4V DM74 40

I

e

0.4V DM74

I

2.4 3.4 V

54 80

54

b

DM74

b

2

20

18

Typ

(Note 1)

Max Units

b

1.5 V

0.2 0.4 V

1mA

b

1.6

b

3.2

b

55

b

55

120 mA

mA

mA

mA

Switching Characteristics

ea

V

CC

5.0V, T

ea

25§C (See Section 1 for waveforms and load configurations)

A

Symbol Parameter

f

t
t

t
t

t
t

t
t

t
t

t
t

t
t

t
t

t
t

t

t

max

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

PLH

PHL

Maximum Clock Frequency 25 25 MHz

Propagation Delay 18 18
EZto O

Z

Propagation Delay 30 30
EZto O

Y

Propagation Delay 14 14
EYto O

Y

Propagation Delay 23 23
Snto O

Y

Propagation Delay 14 14
Snto O

Z

Propagation Delay 39 39
CP to O

Y

Propagation Delay 18 18
CP to O

Z

Propagation Delay 35 30
CP to TC 33 33

Propagation Delay 25 20
CE to TC 21 21

Propagation Delay
MR to O

Y

Propagation Delay
MR to O

Z

5497 DM7497

e

15 pF C

C

L

e

R

400X R

L

e

15 pF

L

e

400X

L

Min Max Min Max

23 23

33 33

10 10

23 23

14 14

30 30

26 26

43 36 ns

34 23 ns

Units

ns

ns

ns

ns

ns

ns

ns

ns

ns

Timing Diagrams

TL/F/9780– 5

TL/F/9780– 6

3