CS8140 datasheet(3/12 Pages) CHERRY

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Package Lead Description

Package Lead #

Lead Symbol

Function

Electrical Characteristics: continued

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Threshold

HIGH VR(HI)

VOUT increasing

4.65

4.90

VOUT - 0.05

LOW VR(LOW)

VOUT decreasing

4.50

4.70

4.90

Threshold Hysteresis(VRH)

(HIGH - LOW)

150

200

250

Reset Output Leakage

VOUT ³VR(HI)

µA

= HIGH

Output Voltage

Low(VL(LOW) )

1V ² VOUT ²VR(LOW)

0.1

0.4

Rp = 2.7k½*

Low (VRpeak )VOUT, Power up, Power down

0.6

1.0

Delay Times

CDELAY = 0.1µF

tPOR

30.0

47.5

65.0

tWDI(

)

0.5

1.0

1.5

s Watchdog

Input Voltage

HIGH

2.0

LOW

0.8

Input Current

WDI ² VOUT

010

µA

Threshold Frequency

CDELAY = 0.1µF

fWDI

LOWER

fWDI(UPPER)**

218

262

326

* RP is connected to

and VOUT.

** CS8140 only

To observe safe operating junction temperature, low duty cycle pulse testing is used on tests where applicable.

RESET

7 Lead

24 Lead *

14 Lead

TO-220

SOIC Wide

PDIP

121

VIN

Supply voltage to IC, usually direct from the battery.

ENABLE

CMOS compatible logical input. VOUT is disabled when

ENABLE is LOW and WDI is beyond its preset limits.

CMOS compatible output lead.

goes low whenever

VOUT drops below 4.5% of its typical value for more than

2µs or WDI signal falls outside itÕs window limits.

12, 20

Gnd

Ground connection.

Delay

Timing capacitor for Watchdog and

functions.

WDI

CMOS compatible input lead. The Watchdog function mon-

itors the falling edge of the incoming digital pulse train. The

signal is usually generated by the system microprocessor.

VOUT

Regulated output voltage, 5V (typ).

N/A

Sense

Kelvin connection which allows remote sensing of output

voltage for improved regulation.

1,6-11,13-19,22

5-10

No connection.

* The CS8141 uses a fused lead package. Leads 6-8 and 17-19 are fused together through the lead frame. These leads are

electrically connected to IC ground and should be connected to system ground for a good thermal connection.

RESET

CS8140 Datasheet(PDF) 3 Page - Cherry Semiconductor Corporation

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