HD3-4702-9Z Intersil, HD3-4702-9Z Datasheet

HD3-4702-9Z

Manufacturer Part Number

HD3-4702-9Z

Description

IC BIT RATE GEN CMOS 16-PDIP

Manufacturer

Intersil

Type

Bit Rate Generatorr

Datasheet

1.HD3-4702-9Z.pdf (8 pages)

Specifications of HD3-4702-9Z

Pll

Input

Clock, Crystal

Output

Clock

Number Of Circuits

Ratio - Input:output

2:1

Differential - Input:output

No/No

Frequency - Max

1MHz

Divider/multiplier

Yes/No

Voltage - Supply

4.5 V ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

16-DIP (0.300", 7.62mm)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Frequency-max

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

HD3-4702-9Z

Manufacturer:

Intersil

Quantity:

200

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CMOS Programmable Bit Rate Generator

The HD-4702 Bit Rate Generator provides the necessary

clock signals for digital data transmission systems, such as a

UART. It generates 13 commonly used bit rates using an on-

chip crystal oscillator or an external input. For conventional

operation generating 16 output clock pulses per bit period,

the input clock frequency must be 2.4576MHz (i.e. 9600

Baud x 16 x 16, since there is an internal ³ 16 prescaler). A

lower input frequency will result in a proportionally lower

output frequency.

The HD-4702 can provide multi-channel operation with a

minimum of external logic by having the clock frequency CO

and the ³ 8 prescaler outputs Q0, Q1, Q2 available externally.

All signals have a 50% duty cycle except 1800 Baud, which

has less than 0.39% distortion.

The four rate select inputs (S0-S3) select which bit rate is at

the output (Z). See Truth Table for Rate Select Inputs for

select code and output bit rate. Two of the 16 select codes for

the HD-4702 do not select an internally generated frequency,

but select an input into which the user can feed either a

different frequency, or a static level (High or Low) to generate

“ZERO BAUD”.

The bit rates most commonly used in modern data terminals

(110, 150, 300, 1200, 2400 Baud) require that no more than

one input be grounded for the HD-4702, which is easily

achieved with a single 5-position switch.

The HD-4702 has an initialization circuit which generates a

master reset for the scan counter. This signal is derived from

a digital differentiator that senses the first high level on the

CP input after the ECP input goes low. When ECP is high,

selecting the crystal input, CP must be low. A high level on

CP would apply a continuous reset. See Clock Modes and

Initialization below.

Truth Table

NOTE: 19200 Baud by connecting Q2 to IM.

TRUTH TABLE FOR RATE SELECT INPUTS

(Using 2.4576MHz Crystal)

Data Sheet

MUX Input (IM)

50 Baud

75 Baud

134.5 Baud

200 Baud

600 Baud

2400 Baud

9600 Baud

4800 Baud

1800 Baud

1200 Baud

2400 Baud

300 Baud

150 Baud

110 Baud

OUTPUT RATE (Z)

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• HD-4702 Provides 13 Commonly Used Bit Rates

• Uses a 2.4576MHz Crystal/Input for Standard Frequency

• Low Power Dissipation

• Conforms to EIA RS-404

• One HD-4702 Controls up to Eight Transmission

• Initialization Circuit Facilitates Diagnostic Fault Isolation

• On-Chip Input Pull-Up Circuit

Ordering Information

Pinout

PACKAGE

PDIP

(Pb-free)

CerDIP

SMD#

*Pb-free PDIPs can be used for through hole wave solder

processing only. They are not intended for use in Reflow solder

processing applications.

Output (16 Times Bit Rate)

Channels

August 24, 2006

All other trademarks mentioned are the property of their respective owners.

Intersil (and design) is a registered trademark of Intersil Americas Inc.

-55 to +125 5962-9051801MEA

-40 to +85 HD3-4702-9

-40 to +85 HD3-4702-9Z*

RANGE

TEMP.

(

GND

HD-4702 (16 Ld PDIP)

TOP VIEW

NUMBER

PART

HD3-4702-9

HD3-4702-9Z

MARKING

HD-4702

PART

FN2954.2

E16.3

F16.3

PKG.

NO.

Related parts for HD3-4702-9Z

HD3-4702-9Z Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 All other trademarks mentioned are the property of their respective owners. HD-4702 FN2954.2 TEMP. RANGE PART PART NUMBER MARKING -40 to +85 HD3-4702-9 HD3-4702-9 -40 to +85 HD3-4702-9Z* HD3-4702-9Z -55 to +125 5962-9051801MEA HD-4702 (16 Ld PDIP) TOP VIEW ...

Page 2

Pin Description PIN NUMBER TYPE SYMBOL GND 11, 12, 13 ...

Page 3

Block Diagram 75 150 300 600 1200 2400 4800 9600 3 HD-4702 FN2954.2 August 24, 2006 ...

Page 4

Application Information Single Channel Bit Rate Generator Figure 1 shows the simplest application of the HD-4702. This circuit generates one of five possible bit rates as determined by the setting of a single pole, 5-position switch. The Bit Rate Out- ...

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HD3-4702-9Z Intersil, HD3-4702-9Z Datasheet

HD3-4702-9Z

Specifications of HD3-4702-9Z

Available stocks

Related parts for HD3-4702-9Z

HD3-4702-9Z Summary of contents

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