TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
operating sequence
ten
tsu(CS)
B7
B0
B1
B2
B3
B4
B5
B6
B7
Conversion Data B
MSB
LSB
Hi-Z State
MSB
LSB
(see Note B)
MSB
Previous Conversion Data A
A7
A6 A5 A4 A3 A2 A1 A0
Hi-Z State
Don’t
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
s 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, VCC (see Note 1)
6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range at any input
– 0.3 V to VCC + 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range
– 0.3 V to VCC + 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, TA (see Note 2): TLC548C, TLC549C
0
°C to 70°C
. . . . . . . . . . . . .
TLC548I, TLC549I
– 40
°C to 85°C
. . . . . . . . . . . .
Storage temperature range, Tstg
–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.