L4949

3

MOTOROLA ANALOG IC DEVICE DATA

Characteristic

Unit

Max

Typ

Min

Symbol

RESET

Reset Threshold Voltage

VResth

–

Vout – 0.5

–

V

Reset Threshold Hysteresis

VResth,hys

mV

@ TJ = 25°C

50

100

200

@ TJ = –40 to +125°C

50

–

300

Reset Pulse Delay (CT = 100 nF, tR ≥ 100 µs)

tResD

55

100

180

ms

Reset Reaction Time (CT = 100 nF)

tResR

–

5.0

30

µs

Reset Output Low Voltage (RReset = 10 kΩ to Vout, VCC ≥ 3.0 V)

VResL

–

–

0.4

V

Reset Output High Leakage Current (VReset = 5.0 V)

IResH

–

–

1.0

µA

Delay Comparator Threshold

VCTth

–

2.0

–

V

Delay Comparator Threshold Hysteresis

VCTth, hys

–

100

–

mV

SENSE

Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V)

VSOth

1.16

1.23

1.35

V

Sense Threshold Hysteresis

VSOth,hys

20

100

200

mV

Sense Output Low Voltage

VSOL

–

–

0.4

V

(VSI ≤ 1.16 V, VCC ≥ 3.0 V, RSO = 10 kΩ to Vout)

Sense Output Leakage (VSO = 5.0 V, VSI ≥ 1.5 V)

ISOH

–

–

1.0

µA

Sense Input Current

ISI

–1.0

0.1

1.0

µA

PREREGULATOR

Preregulator Output Voltage (IZ = 10 µA)

VZ

–

6.3

–

V

PIN FUNCTION DESCRIPTION

Pin

Symbol

Description

1

VCC

Supply Voltage

2

Si

Input of Sense Comparator

3

VZ

Output of Preregulator

4

CT

Reset Delay Capacitor

5

Gnd

Ground

6

Reset

Output of Reset Comparator

7

SO

Output of Sense Comparator

8

Vout

Main Regulator Output

4.96

4.98

5.0

5.02

5.04

–40

–20

0

40

60

20

100

120

TJ, JUNCTION TEMPERATURE (°C)

80

VCC = 14 V

Iout = 1.0 mA

0

2.0

3.0

4.0

6.0

010

VCC, SUPPLY VOLTAGE (V)

1.0

1.0

TJ = 25°C

RL = 100 Ω

RL = 5.0 k

5.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

Figure 1. Output Voltage versus

Junction Temperature

Figure 2. Output Voltage versus

Supply Voltage

TYPICAL CHARACTERIZATION CURVES