TLC548C, TLC548I, TLC549C, TLC549I

8-BIT ANALOG-TO-DIGITAL CONVERTERS

WITH SERIAL CONTROL

SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996

3

POST OFFICE BOX 655303

operating sequence

ten

ten

tsu(CS)

B7

B0

B1

B2

B3

B4

B5

B6

B7

Conversion Data B

MSB

MSB

LSB

Hi-Z State

MSB

LSB

(see Note B)

MSB

Previous Conversion Data A

A7

A7

A6 A5 A4 A3 A2 A1 A0

Hi-Z State

Don’t

1

1

(see Note A)

tconv

tsu(CS)

Access

Cycle B

88

7

6

5

4

3

2

7

6

5

4

3

2

CLOCK

I/O

CS

OUT

DATA

Care

Sample

Cycle B

Access

Cycle C

Sample

Cycle C

twH(CS)

NOTES: A. The conversion cycle, which requires 36 internal system clock periods (17

µs maximum), is initiated with the eighth I/O clock pulse

trailing edge after CS goes low for the channel whose address exists in memory at the time.

B. The most significant bit (A7) is automatically placed on the DATA OUT bus after CS is brought low. The remaining seven bits (A6–A0)

are clocked out on the first seven I/O clock falling edges. B7–B0 follows in the same manner.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range at any input

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak input current range (any input)

±10 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak total input current range (all inputs)

±30 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0

°C to 70°C

. . . . . . . . . . . . .

TLC548I, TLC549I

– 40

°C to 85°C

. . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOTES:

1. All voltage values are with respect to the network ground terminal with the REF– and GND terminals connected together, unless

otherwise noted.

2. The D package is not recommended below – 40

°C.