Datasheet > HD1-4702/883

HD1-4702/883

更新时间： 2024-09-22 21:53:31

品牌	Logo	应用领域
英特矽尔 - INTERSIL		/
页数	文件大小	规格书
8页	84K
描述
CMOS Programmable Bit Rate Generator

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数据手册

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HD1-4702/883 数据手册

HD-4702/883

CMOS Programmable Bit Rate Generator

June 1998

Features

Description

• This Circuit is Processed in Accordance to MIL-STD-883

and is Fully Conformant Under the Provisions of

Paragraph 1. 2. 1.

The HD-4702/883 Bit Rate Generator provides the

necessary clock signals for digital data transmission sys-

tems, 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 ÷ 16 prescaler). A lower input frequency will result in

a proportionally lower output frequency.

• HD-4702/883 Provides 13 Commonly Used Bit Rates

• Uses a 2.4576MHz Crystal/Input for Standard

Frequency Output (16 Times Bit Rate)

• Low Power Dissipation

• Conforms to ElA RS-404

The HD-4702/883 can provide multi-channel operation with

a minimum of external logic by having the clock frequency

• One HD-4702/883 Controls up to Eight Transmission

Channels

and the ÷ 8 prescaler outputs Q , Q , Q available

0 1 2

externally. All signals have a 50% duty cycle except 1800

Baud, which has less than 0.39% distortion.

• Initialization Circuit Facilitates Diagnostic Fault

Isolation

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

• On-Chip Input Pull-Up Circuit

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-4702/883 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”.

Ordering Information

PART

NUMBER

TEMPERATURE

RANGE ( C)

PACKAGE

PKG. NO.

F16.3

HD1-4702/883

-55 to 125

CERDIP

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-4702/883, which is easily

achieved with a single 5-position switch.

The HD-4702/883 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 C input after the E

input goes low. When

is high, selecting the crystal input, C must be low. A

high level on C would apply a continuous reset. See Clock

Modes and Initialization below.

Pinout

HD-4702/883 (CERDIP)

TOP VIEW

GND

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

File Number 2955.2

12 3 4 5 6 7 8

中文翻译

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与HD1-4702/883相关器件

型号	品牌	获取价格	描述	数据表
HD1-4702-2	RENESAS	获取价格	IC,BAUD RATE GENERATOR,CMOS,DIP,16PIN,CERAMIC
HD1-4702-8	RENESAS	获取价格	暂无描述
HD14702883B	RENESAS	获取价格	2.4576MHz, OTHER CLOCK GENERATOR, CDIP16, CERDIP-16
HD1-4702-9	RENESAS	获取价格	2.4576MHz, OTHER CLOCK GENERATOR, CDIP16, CERDIP-16
HD1-4702-9+	RENESAS	获取价格	IC,BAUD RATE GENERATOR,CMOS,DIP,16PIN,CERAMIC
HD1-4702A-9	RENESAS	获取价格	IC,BAUD RATE GENERATOR,CMOS,DIP,16PIN,CERAMIC
HD1-4702R/883	RENESAS	获取价格	HD1-4702R/883
HD1-4702R-9	RENESAS	获取价格	IC,BAUD RATE GENERATOR,CMOS,DIP,16PIN,CERAMIC
HD15	TELEDYNE	获取价格	High Voltage Divider Set, Thick film,Non-Inductive R1 & R2
HD-15003S	HRS	获取价格	90 Degree Hybrid Coupler, 800MHz Min, 2300MHz Max, CERAMIC, SMT, 8 PIN

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