SN54LV221A, SN74LV221A

DUAL MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SCLS450G − DECEMBER 1999 − REVISED APRIL 2005

9

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

NOTES: A. CL includes probe and jig capacitance.

B. All input pulses are supplied by generators having the following characteristics: PRR

≤ 1 MHz, ZO = 50 Ω, tr + 3 ns, tf + 3 ns.

C. The outputs are measured one at a time, with one input transition per measurement.

50% VCC

tPLH

tPHL

VOH

VOL

VCC

50% VCC

50% VCC

VCC

Input A

(see Note B)

50% VCC

0 V

0 V

In-Phase

Output

Out-of-Phase

Output

VOLTAGE WAVEFORMS

DELAY TIMES

Input B

(see Note B)

VOL

VOH

LOAD CIRCUIT

Test

Point

CL

(see Note A)

From Output

Under Test

50% VCC

tPLH

tPHL

tPHL

tPLH

VOH

VOH

VOL

VOL

VCC

0 V

50% VCC

Input CLR

(see Note B)

Out-of-Phase

Output

In-Phase

Output

VOLTAGE WAVEFORMS

DELAY TIMES

50% VCC

50% VCC

50% VCC

50% VCC

VCC

0 V

tw

VOLTAGE WAVEFORMS

PULSE DURATION

Inputs or

Outputs

50% VCC

50% VCC

Figure 1. Load Circuit and Voltage Waveforms