TLC193, TLC393

DUAL MICROPOWER LinCMOS VOLTAGE COMPARATOR

SLCS115E − DECEMBER 1986 − REVISED JULY 2003

7

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

switching characteristics, VDD = 5 V, TA = 25°C (see Figure 3)

PARAMETER

TEST CONDITIONS

TLC393C, TLC393I

TLC393Q, TLC193M,

TLC393M

UNIT

MIN

TYP

MAX

Overdrive = 2 mV

4.5

f10 kH

Overdrive = 5 mV

2.5

tPLH

Propagation delay time, low-to-high-level output

f = 10 kHz,

CL =15 pF

Overdrive = 10 mV

1.7

µs

tPLH

Pro agation delay time, low to high level out ut

CL = 15 pF

Overdrive = 20 mV

1.2

µs

Overdrive = 40 mV

1.1

VI = 1.4-V step at IN +

1.1

Overdrive = 2 mV

3.6

f10 kH

Overdrive = 5 mV

2.1

tPHL

Propagation delay time, high-to-low-level output

f = 10 kHz,

CL =15 pF

Overdrive = 10 mV

1.3

µs

tPHL

Pro agation delay time, high to low level out ut

CL = 15 pF

Overdrive = 20 mV

0.85

µs

Overdrive = 40 mV

0.55

VI = 1.4-V step at IN +

0.10

tf

Fall time, output

f = 10 kHz,

CL = 15 pF

Overdrive = 50 mV

22

ns

PARAMETER MEASUREMENT INFORMATION

The TLC393 contains a digital output stage which, if held in the linear region of the transfer curve, can cause

damage to the device. Conventional operational amplifier/comparator testing incorporates the use of a servo

loop that is designed to force the device output to a level within this linear region. Since the servo-loop method

of testing cannot be used, the following alternatives for testing parameters such as input offset voltage,

common-mode rejection ratio, etc., are suggested.

To verify that the input offset voltage falls within the limits specified, the limit value is applied to the input as shown

in Figure 1(a). With the noninverting input positive with respect to the inverting input, the output should be high.

With the input polarity reversed, the output should be low.

A similar test can be made to verify the input offset voltage at the common-mode extremes. The supply voltages

can be slewed as shown in Figure 1(b) for the VICR test, rather than changing the input voltages, to provide

greater accuracy.

+

−

5 V

Applied VIO

Limit

VO

+

−

1 V

Applied VIO

Limit

VO

− 4 V

(a) VIO WITH VIC = 0 V

(b) VIO WITH VIC = 4 V

5.1 k

Ω

5.1 k

Ω

Figure 1. Method for Verifying That Input Offset Voltage Is Within Specified Limits