TL851 Digital IC -- page 2

Absolute Maximum Ratings over Operating Free-Air Temperature Range

Voltage at any pin with respect to ground.......................................................................... -0.5 to +7.0 VDC

Continuous power dissipation at (or below) 25° C free-air temperature (see note)....................... 1150 mW

Operating free-air temperature range ...................................................................................... 0° C to 70° C

Storage temperature range................................................................................................. -65° C to 150° C

Lead temperature 1.6 mrn (1/16 inch) from case for 10 seconds...................................................... 260° C

Note: For operation above 25° C, derate linearly at the rate of 9.2 mW/C

Recommended Operating Conditions

MIN

MAX

UNIT

Supply Voltage, Vcc

4.5

6.8

V

BLNK, BINH, INIT

2.1

V

BLNK, BINH, INIT

0.6

V

ECHO and OSC Output Voltage

6.8

V

Delay Time, Power Up to INIT High

5

ms

Operating Free-air Temperature

0

40

°C

Electrical Characteristics over Recommended Ranges of Supply Voltage and Operating

PARAMETER

TEST COND.

MIN

TYP

MAX

UNIT

Input Current

BLNK, BINH, INIT

1

mA

ECHO, OSC, GC*

100

µA

0.4

V

On-state Output Current

XMIT output

-140

mA

Internal Blanking Interval

2.38†

ms

Frequency During 16-pulse

OSC output

49.4†

kHz

Transmit Period

XMIT output

49.4†

kHz

Frequency After 16-pulse

OSC output

93.3†

kHz

Transmit Period

XMIT output

0

kHz

Supply Current, Icc

During transmit period

260

mA

After transmit period

55

mA

† These typical values apply for a 420 kHz ceramic resonator

Pinout Description

Pin

Name

Description

Pin

Name

Description

1

Positive Supply

16

BLNK

Blanking

2

XMIT

Transmit

15

BINH

Blanking Inhibit

3

GND

Circuit Ground

14

INIT

Ranging Initiate

4

GCD

MSB Digital Gain Control

13

FIL

5

GCA

LSB Digital Gain Control

12

XTAL1

Crystal Input

6

GCB

Digital Gain Control

11

XTAL2

Crystal Input

7

GCC

Digital Gain Control

10

OSC

Oscillator Clock Output

8

REC

Receive Input (analog level)

9

ECHO

Echo Detected (digital level)

For more information, visit our website: www.senscomp.com

4/28/04