TLC540I Datasheet, PDF (3/11 Pages) Texas Instruments – 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS

operating sequence
TLC540I, TLC541I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS065A – OCTOBER 1983 – REVISED MARCH 1995
I/O
CLOCK
CS
ADDRESS
INPUT
1234
Access
Cycle B
(see Note C)
567
Sample
Cycle B
8
Don’t Care
tconv
See Note A
12345678
Access
Cycle C
Sample
Cycle C
MSB
LSB
B3 B2 B1 B0
twH(CS)
Don’t Care
MSB
LSB
C3 C2 C1 C0
Don’t Care
DATA
OUT
A7 A6 A5 A4 A3 A2 A1 A0
Hi-Z State
A7
Previous Conversion Data A
MSB
(See Note B)
LSB MSB
B7 B6 B5 B4 B3 B2 B1 B0
Hi-Z
State
MSB
B7
Conversion Data B
LSB MSB
NOTES: A. The conversion cycle, which requires 36 system clock periods, is initiated on the 8th falling edge of I/O CLOCK after CS goes low
for the channel whose address exists in memory at that time. If CS is kept low during conversion, I/O CLOCK must remain low
for at least 36 system clock cycles to allow conversion to be completed.
B. The most significant bit (MSB) will automatically be placed on the DATA OUT bus after CS is brought low. The remaining seven
bits (A6 – A0) will be clocked out on the first seven I/O CLOCK falling edges.
C. To minimize errors caused by noise at CS, the internal circuitry waits for three system clock cycles (or less) after a chip select
falling edge is detected before responding to control input signals. Therefore, no attempt should be made to clock-in address data
until the minimum chip-select setup time has elapsed.
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, V_I (any input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to V_CC + 0.3 V
Output voltage range, V_O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to V_CC + 0.3 V
Peak input current range (any input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 10 mA
Peak total input current (all inputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 30 mA
Operating free-air temperature range, T_A: TLC540I, TLC541I . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Case temperature for 10 seconds: FN package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: DW or N package . . . . . . . . . . . . . . . 260°C
† _{Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and}
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to digital ground with REF– and GND wired together (unless otherwise noted).
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3