10-54

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

http://www.intersil.com or 407-727-9207

Description

receives sinusoidal vehicle speed information from a

speedometer signal source. The signal is amplified and

squared before frequency processing is done. The circuit

provides pin programmable integer prescaler and postscaler

dividers to scale the output frequencies. The prescaler

divider output of the frequency doubler is mode selected for

1 and 6 through 11. The postscaler mode is selected to the

open collector drivers.

Speed Sensor Input (SSI) - When current limited with a

40k

Ω source impedance from the vehicle speed sensor, the

SSI input is capable of functioning over a wide range of input

signal. The limiter and squaring action is derived from the

zero crossing of the input signal. The signal is converted into

a square wave with a controlled hysteresis squaring

amplifier.

Power Supply - The power supply pin 2 input is intended to

operate from a 5.0V

± 0.3V source. The internal reference

sources are derived from a temperature stable bandgap;

including an optional 5.7V shunt regulator which may be

used as shown in Figure 2.

Output Drivers - Each output driver is an open NPN collector

with a zener clamp level of typically 35V and short circuit

current limiting. Each output is capable of sinking 15mA of

current.

File Number

2790.2

October 1993

HIP9020

Programmable Quad Buffer with

Pre and Post Scaler Dividers

Features

• Sine Wave Speedometer Input

• Input Limiting

. . . . . . . . . . . ±0.25V to ±100V (with 40kΩ)

• Over Voltage Protection

• Current Limiting

• Programmable Prescaler 1, 6 - 11

• Post Scaler Frequency Divide by 1 or 2

• Drivers with 15mA/24V Capability

• Outputs 4 Separate Square Waves

• Internal Regulator and Bias Source

• 0kHz to 6kHz Input Signal Range

Applications

• Prescaler

• Buffer/Limiter

• Signal Interface

• Automotive Speedometer

• Automotive Speed Control

• Automotive Tachometer

Ordering Information

PART

NUMBER

TEMPERATURE

RANGE

PACKAGE

HIP9020AP

14 Lead Plastic DIP

HIP9020AB

20 Lead Plastic SOIC (W)

Pinouts

HIP9020 (PDIP)

TOP VIEW

HIP9020 (SOIC)

TOP VIEW

GND

POSS

SSI

BUF

VO1

VO2

VO3

VO4

PRSS–A

1

2

3

4

5

6

7

14

13

12

11

10

9

8

PRSS–B

PRSS–C

PRSO

POSI

11

12

13

14

15

16

17

18

20

19

10

9

8

7

6

5

4

3

2

1

GND

NC

SSI

BUF

NC

NC

VO1

NC

VO2

VO3

NC

VO4

NC

PRSS–A

PRSS–B

PRSS–C

POSS

PRSO

POSI