5-9

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

ELECTRICAL CHARACTERISTICS: (Cont.)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

50

100

—

mA

500

—

—

µA

Battery Backup Mode

Battery Switchover Threshold

—

—V

Battery Switchover Hysteresis

—

20

—

mV

CEO Output Voltage in

—

—

V

Battery Backup Mode

Threshold Detector Trip Voltage

1.2

—

1.4

V

Threshold Detector Input Current

–25

—

+25

nA

Threshold Detector Hysteresis

—

10

—

mV

ELECTRICAL CHARACTERISTICS:

specified.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

PB Hold Time

Figure 4 (Note 4)

20

—

—

msec

Reset Active Time

Figure 6

500

—

900

msec

RS STROBE Pulsewidth

Figure 3

500

—

—

nsec

Watchdog Timeout Period

Figure 3

500

700

900

msec

Figure 6

—

—

100

nsec

ELECTRICAL CHARACTERISTICS:

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

CE Propagational Delay

Figure 7

—

—

50

nsec

ELECTRICAL CHARACTERISTICS:

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Figure 5 (Note 1)

10

—

—

µsec

4.25V to 3.0V

Figure 5 (Note 1)

0

—

—

µsec

3.0V to 4.25V

NOTES: 1. All voltages referenced to ground.

2. No output load.

3

4. The RS output must be held low for a minimum of 20msec to guarantee a reset.

TC70/71

MICROMASTER™ – SYSTEM SUPERVISOR

WITH POWER SUPPLY MONITOR, WATCHDOG

AND BATTERY BACKUP