TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
operating sequence
1
I/O
CLOCK
tsu(CS)
CS
twH(CS)
DATA
OUT
Hi-Z State
A7
A6 A5 A4 A3 A2 A1 A0
A7
Previous Conversion Data A
MSB
LSB
(see Note B)
ten
Conversion Data B
MSB
ten
MSB
LSB
MSB
B7
B6 B5 B4 B3 B2 B1 B0
B7
Hi-Z State
2
3
4
5
6
7
8
Don’t
Care
1
2
3
4
5
6
7
8
Access
Cycle B
Sample
Cycle B
tconv
(see Note A)
tsu(CS)
Access
Cycle C
Sample
Cycle C
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)
Supply voltage, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
Input voltage range at any input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to V
CC
+ 0.3 V
Output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to V
CC
+ 0.3 V
Peak input current range (any input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
10 mA
Peak total input current range (all inputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
30 mA
Operating free-air temperature range, T
A
(see Note 2): TLC548C, TLC549C . . . . . . . . . . . . . 0°C to 70°C
TLC548I, TLC549I . . . . . . . . . . . . – 40°C to 85°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
TI [ TEXAS INSTRUMENTS ]
