
TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
See Note B
0.4 V
2.4 V
tf(bus)
Output
tr(bus)
0.8 V
2.4 V
0.8 V
td
DATA OUT
VOLTAGE WAVEFORMS FOR RISE AND FALL TIMES
VOLTAGE WAVEFORMS FOR DELAY TIME
VCC
3 k
3 k
VCC
See Note B
50%
0 V
tPLZ
I/O CLOCK
VOLTAGE WAVEFORMS FOR ENABLE AND DISABLE TIMES
Output Waveform 1
(see Note C)
tPHZ
VOH
90%
10%
tPZL
0 V
VCC
50%
CS
LOAD CIRCUIT FOR
tPZL AND tPLZ
LOAD CIRCUIT FOR
tPZH AND tPHZ
LOAD CIRCUIT FOR
td, tr, AND tf
See Note B
Output
Under Test
Test
Point
3 k
1.4 V
Output Waveform 2
(see Note C)
CL
(see Note A)
Output
Under Test
Test
Point
CL
(see Note A)
Output
Under Test
Test
Point
CL
(see Note A)
tPZH
50%
NOTES: A. CL = 50 pF for TLC548 and 100 pF for TLC549; CL includes jig capacitance.
B. ten = tPZH or tPZL, tdis = tPHZ or tPLZ.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
Figure 1. Load Circuits and Voltage Waveforms