Datasheet

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
t
en
t
en
t
su(CS)
B7
B0B1B2B3B4B5B6B7
Conversion Data B
MSBMSB LSB
Hi-Z State
MSBLSB
(see Note B)
MSB
Previous Conversion Data A
A7
A7 A6 A5 A4 A3 A2 A1 A0
Hi-Z State
Don’t
11
(see Note A)
t
conv
t
su(CS)
Access
Cycle B
88765432765432
CLOCK
I/O
CS
OUT
DATA
Care
Sample
Cycle B
Access
Cycle C
Sample
Cycle C
t
wH(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)
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.