©

1999 IMP, Inc.

408-432-9100/www.impweb.com

3

IMP1

232LP/LPS

Absolute Maximum Ratings

Electrical Characteristics

Operating Temperature Range . . . . . . . . . . . –40

°C to 85°C

(N/EMA version)

0

°C to 70°C

Soldering Temperature . . . . . . . . . . . . . . . . . . 260

°C for 10 seconds

Storage Temperature . . . . . . . . . . . . . . . . . . . –55

°C to 125°C

Voltages measured with respect to ground.

These are stress ratings only and functional operation is not implied.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

4.5

5.5

V

ST and PBRST Input High Level

V

ST and PBRST Input Low Level

– 0.3

0.8

V

4.50

4.62

4.74

V

4.25

4.37

4.49

V

Watchdog Time-Out Period

TD = GND

62.5

150

250

ms

Watchdog Time-Out Period

500

1200

2000

ms

Watchdog Time-Out Period

TD floating

250

610

1000

ms

Output Voltage

I = –500

µA, Note 3

V

Output Current

Output = 2.4V , Note 2

– 8

–10

mA

Output Current

Output = 0.4V,

10

mA

Input Leakage

Note 1

–1.0

1.0

µA

RESET Low Level

0.4

V

Internal Pull-Up Resistor

Note 1

40

k

Ω

Operating Current (CMOS)

30

µA

Input Capacitance

5pF

Output Capacitance

10

pF

PBRST Manual Reset

20

ms

Minimum Low Time

Reset Active Time

250

610

1000

ms

ST Pulse Width

Note 4

20

ns

58

µs

RESET or RESET

4.75V to 4.25V

300

µs

PBRST Stable LOW to

20

ms

RESET and RESET Active

250

610

1000

ms

RESET Inactive

4.25V to 4.75V

0

ns

Unless otherwise stated, 4.5V

devices). All voltages are referenced to ground.

2. RESET is an open drain output.

strobed.