CS8140YDW24 CHERRY [Cherry Semiconductor Corporation], CS8140YDW24 Datasheet

CS8140YDW24

Manufacturer Part Number

CS8140YDW24

Description

5V, 500mA Linear Regulator with ENABLE, , and Watchdog RESET

Manufacturer

CHERRY [Cherry Semiconductor Corporation]

Datasheet

1.CS8140YDW24.pdf (12 pages)

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Rev. 2/23/99

The CS8140 is a 5V Watchdog

Regulator with protection circuitry and

three logic control functions that allow

a microprocessor to control its own

power supply. The CS8140 is designed

for use in automotive, switch mode

power supply post regulator, and bat-

tery powered systems.

Basic regulator performance character-

istics include a low noise, low drift, 5V

± 4% precision output voltage with low

dropout voltage (1.25V @ I

and low quiescent current (7mA @ I

= 500mA). On board short circuit, ther-

mal, and overvoltage protection make it

possible to use this regulator in particu-

larly harsh operating environments.

The Watchdog logic function monitors

an input signal (WDI) from the micro-

processor or other signal source. When

the signal frequency moves outside

externally programmable window lim-

its, a

(

dow frequency limits as well as the

power on reset (POR) and

The

ENABLE

RESET

DELAY

WDI

Gnd

V IN

RESET

) programs the watchdog win-

). An external capacitor

function is activated by any

signal is generated

ENABLE,

5V, 500mA Linear Regulator with

Control Logic

Watchdog

Reference

ENABLE

RESET

& Bias

Delay

OUT

RESET

= 500mA)

Description

delay.

Block Diagram

OUT

Regulation

Overtemperature

Overvoltage

of three conditions: the watchdog sig-

nal moves outside of its preset limits;

the output voltage drops out of regula-

tion by more than 4.5%; or the IC is in

its power up sequence. The

nal is independent of V

down to V

In conjunction with the Watchdog, the

ENABLE function controls the regula-

torÕs power consumption. The CS8140Õs

output stage and its attendant circuitry

are enabled by setting the ENABLE

lead high. The regulator goes into sleep

mode (I

ENABLE lead goes low and the watch-

dog signal moves outside its preset

window limits. This unique combina-

tion of control functions in the CS8140

gives the microprocessor control over

its own power down sequence: i.e. it

gives the microprocessor the flexibility

to perform housekeeping functions

before it powers down.

The CS8141 has the same features as the

CS8140, except that the CS8141 only

responds to input signals (WDI) which

are below the preset watchdog frequen-

cy threshold.

RESET

CS8140/1

Undervoltage

Short Circuit

OUT

= 250µA) when the

= 1V.

, and Watchdog

and reliable

*NOTE: shorted together

on 7 Lead TO-220

RESET

V OUT

Sense

RESET

Delay

sig-

2000 South County Trail, East Greenwich, RI 02818

Sense

Delay

WDI

OUT

Tel: (401)885-3600 Fax: (401)885-5786

Cherry Semiconductor Corporation

14 Lead PDIP

Web Site: www.cherry-semi.com

5V ± 4%, 500mA Output

Voltage

µP Compatible Control

Functions

Low Dropout Voltage

(1.25V @ 500mA)

Low Quiescent Current

(7mA @ 500mA)

Low Noise, Low Drift

Low Current SLEEP Mode

Fault Protection

Email: info@cherry-semi.com

Package Options

24 Lead SOIC Wide

Watchdog

ENABLE

Thermal Shutdown

60V Peak Transient

Voltage

Sense

Short Circuit

Delay

RESET

= 250µA)

WDI

Gnd

OUT

Features

RESET

ENABLE

Gnd

7 Lead TO-220

RESET

ENABLE

Gnd

Tab (Gnd)

Company

1 V

2 ENABLE

4 Gnd

5 Delay

6 WDI

7 V

RESET

OUT

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CS8140YDW24 Summary of contents

Page 1

Linear Regulator with ENABLE, Description The CS8140 Watchdog Regulator with protection circuitry and three logic control functions that allow a microprocessor to control its own power supply. The CS8140 is designed for use in automotive, ...

Page 2

Input Voltage Operating Range .................................................................................................................................................-0.5 to +26V Peak Transient Voltage (46V Load Dump @ 14V V Electrostatic Discharge (Human Body Model)...............................................................................................................................................4kV WDI Input Signal Range ...............................................................................................................................................-0.3 to +7V Internal Power Dissipation ..............................................................................................................................Internally limited Junction Temperature Range (TJ) .......................................................................................................................-40¡C to +150¡C ...

Page 3

PARAMETER RESET Threshold HIGH V V R(HI) LOW V V R(LOW) Threshold Hysteresis(V ) (HIGH - LOW) RH Reset Output Leakage V = HIGH RESET Output Voltage Low ² V L(LOW 2.7k½* Low ( ...

Page 4

V vs. V over 25ûC OUT IN LOAD 5 ENABLE IN 5.0 4 LOAD load 4 6.67W load 3 10W 3.0 load 2.5 2.0 1.5 1.0 ...

Page 5

Typical Performance Characteristics: continued Quiescent Current vs. V over ENABLE (V) IN Watchdog Frequency ...

Page 6

Dropout Voltage The input-output voltage differential at which the circuit ceases to regulate against further reduction in input volt- age. Measured when the output voltage has dropped 100mV from the nominal value obtained at 14V input, dropout voltage is dependent ...

Page 7

Figure 3: Timing Diagrams for Watchdog and ENABLE Functions 3a: V when Watchdog is held high and ENABLE = HIGH. OUT V IN ENABLE WDI 0V RESET 0V V OUT 0V 3b: V when Watchdog is held low and ENABLE ...

Page 8

As long as ENABLE is high or ENABLE is low and the Watchdog signal is normal, V will (typ). If OUT ENABLE is low and the Watchdog signal moves outside programmable limits, the output transistor turns off ...

Page 9

The duration of the reset pulse is given by: T (typ WDI( ) RESET This has a tolerance of ±50% due to the IC, and ±10% due to the capacitor. The duration of the reset pulse ...

Page 10

Battery 0.1mF (optional) Ignition 0.1mF *C1 is required if regulator is located far from the power source filter. **C2 required for stability ***R ² 80k½ Figure 7. Application Diagram 110K Figure 8. Applications diagram for CS8140. The ...

Page 11

Step 3: Increase the ESR of the capacitor from zero using the decade box and vary the load current until oscillations appear. Record the values of load current and ESR that cause the greatest oscillation. This represents the worst case ...

Page 12

... REF: JEDEC MS-001 Ordering Information Part Number Description CS8140YT7 7L TO-220 Straight CS8140YTVA7 7L TO-220 Vertical CS8140YTHA7 7L TO-220 Horizontal CS8140YDW24 24L SO CS8140YDWR24 24L SO (tape & reel) CS8140YN14 14L PDIP CS8141YT7 7L TO-220 Straight CS8141YTVA7 7L TO-220 Vertical CS8141YTHA7 7L TO-220 Horizontal CS8141YDWF24 ...

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