SELECTABLE 4 DECADE CMOS DIVIDER

FEATURES:

• Selectable Divide by 10 or 100 or 1,000 or 10,000

• Clock Input Shaping Network Accepts Fast or Slow

Edge Inputs

• Active Oscillator Network for External Crystal

• Square Wave Output

• Output TTL Compatible at +4.5 Volt Operation

• High Noise Immunity

• Reset

• All Inputs Protected

• Low Power Dissipaton

• RDD104 (DIP); RDD104-S (SOIC) - See Figure 1

DC ELECTRICAL CHARACTERISTICS:

(All voltages referenced to Vss)

-40°C

+25°C

+85°C

UNIT

Quiescent Device Current

4.5V

10

10

300

uA Max

10V

20

20

600

uA Max

Output Voltage, Low Level

4.5V

0.01

0.01

0.05

V Min

10V

0.01

0.01

0.05

V Min

High Level

4.5V

4.49

4.49

4.45

V Max

10V

9.99

9.99

9.95

V Max

Input Noise Immunity

4.5V

1.3

1.3

1.3

V Min

(Low and High)

10V

3.0

3.0

3.0

V Min

Output Drive Current:

N-Channel Sink Current

4.5V

2.3

1.9

1.6

mA Min

10V

5.0

4.0

3.5

mA Min

P-Channel Source Current

4.5V

1.1

0.95

0.8

mA Min

10V

2.5

2.1

1.8

mA Min

Input Capacitance (any input)

5.0

pF Max

DESCRIPTION OF OPERATION:

The RDD104 is a monolithic CMOS four decade

divider circuit that advances on each negative

transition of the input clock pulse. When the reset

input is high the circuit is cleared to zero. The

clock input is applied to a three stage inverting

amplifier network whose output is brought out so

that an external crystal network can be used to

form an oscillator circuit. If the clock output is not

used,the amplifier acts as an input buffer. Two

select inputs are provided which enables the circuit

to divide by 10, 100, 1,000 or 10,000.

The Output Division is selected according to the

following truth table:

DIVIDER SELECT INPUTS:

OUTPUT

SELECT 2

SELECT 1

DIVISION

0

0

10,000

0

1

1,000

1

0

100

1

1

10

MAXIMUM RATINGS:

PARAMETER

SYMBOL

VALUE

UNIT

Storage Temperature

-65 to +150

°C

Operating Temperature

-40 to +85

°C

DC Supply Voltage

+18

V

Voltage at any input

January 2000

PIN ASSIGNMENT - TOP VIEW

1

2

3

4

5

6

7

8

FIGURE 1

OUTPUT

CLOCK OUTPUT

CLOCK INPUT

DIVIDER

SELECT-1

DIVIDER

SELECT-2

RESET

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.

RDD104-092491

LSI/CSI

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

(631) 271-0400 FAX (631) 271-0405

RDD 104

UL

®

A3800