SN54LV221A MONOSTABLE MULTIVIBRATORS Datasheet

SN54LV221A Datasheet, PDF, Equivalent


Part Number

SN54LV221A

Description

DUAL MONOSTABLE MULTIVIBRATORS

Manufacture

etcTI

Total Page 24 Pages
Datasheet
Download SN54LV221A Datasheet


SN54LV221A
D 2-V to 5.5-V VCC Operation
D Max tpd of 11 ns at 5 V
D Support Mixed-Mode Voltage Operation on
All Ports
D Schmitt-Trigger Circuitry on A, B, and CLR
Inputs for Slow Input Transition Rates
D Overriding Clear Terminates Output Pulse
D Glitch-Free Power-Up Reset on Outputs
SN54LV221A . . . J OR W PACKAGE
SN74LV221A . . . D, DB, DGV, NS, OR PW PACKAGE
(TOP VIEW)
1A
1B
1CLR
1Q
2Q
2Cext
2Rext/Cext
GND
1
2
3
4
5
6
7
8
16 VCC
15 1Rext/Cext
14 1Cext
13 1Q
12 2Q
11 2CLR
10 2B
9 2A
SN54LV221A, SN74LV221A
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITTĆTRIGGER INPUTS
SCLS450G − DECEMBER 1999 − REVISED APRIL 2005
D Ioff Supports Partial-Power-Down Mode
Operation
D Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
D ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101)
SN54LV221A . . . FK PACKAGE
(TOP VIEW)
1CLR
1Q
NC
2Q
2Cext
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
1Cext
1Q
NC
2Q
2CLR
description/ordering information
NC − No internal connection
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SOIC − D
Tube of 40
Reel of 2500
SN74LV221AD
SN74LV221ADR
LV221A
SOP − NS
Reel of 2000 SN74LV221ANSR 74LV221A
−40°C to 85°C
SSOP − DB
Reel of 2000
Tube of 90
SN74LV221ADBR
SN74LV221APW
LV221A
TSSOP − PW
Reel of 2000
Reel of 250
SN74LV221APWR
SN74LV221APWT
LV221A
TVSOP − DGV Reel of 2000 SN74LV221ADGVR LV221A
CDIP − J
Tube of 25
SNJ54LV221AJ
SNJ54LV221AJ
−55°C to 125°C CFP − W
Tube of 150
SNJ54LV221AW
SNJ54LV221AW
LCCC − FK
Tube of 55
SNJ54LV221AFK
SNJ54LV221AFK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2005, Texas Instruments Incorporated
1

SN54LV221A
SN54LV221A, SN74LV221A
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITTĆTRIGGER INPUTS
SCLS450G − DECEMBER 1999 − REVISED APRIL 2005
description/ordering information (continued)
The ’LV221A devices are dual multivibrators designed for 2-V to 5.5-V VCC operation. Each multivibrator has
a negative-transition-triggered (A) input and a positive-transition-triggered (B) input, either of which can be used
as an inhibit input.
These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method,
the A input is low and the B input goes high. In the second method, the B input is high and the A input goes low.
In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.
The output pulse duration is programmable by selecting external resistance and capacitance values. The
external timing capacitor must be connected between Cext and Rext/Cext(positive) and an external resistor
connected between Rext/Cext and VCC. To obtain variable pulse durations, connect an external variable resistor
between Rext/Cext and VCC. The output pulse duration also can be reduced by taking CLR low.
Pulse triggering occurs at a particular voltage level and is not related directly to the transition time of the input
pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition
rates with jitter-free triggering at the outputs.
Once triggered, the outputs are independent of further transitions of the A and B inputs and are a function of
the timing components, or the output pulses can be terminated by the overriding clear. Input pulses can be of
any duration relative to the output pulse. Output pulse duration can be varied by choosing the appropriate timing
components. Output rise and fall times are TTL compatible and independent of pulse duration. Typical triggering
and clearing sequences are illustrated in the input/output timing diagram.
The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing
components. An example of this distribution for the ’LV221A is shown in Figure 8. Variations in output pulse
duration versus supply voltage and temperature are shown in Figure 5.
During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free,
without applying a reset pulse.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
Pin assignments are identical to those of the ’AHC123A and ’AHCT123A devices, so the ’LV221A can be
substituted for those devices not using the retrigger feature.
For additional application information on multivibrators, see the application report Designing With The
SN74AHC123A and SN74AHCT123A, literature number SCLA014.
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Features D 2-V to 5.5-V VCC Operation D Max tpd o f 11 ns at 5 V D Support Mixed-Mode Vol tage Operation on All Ports D Schmitt-T rigger Circuitry on A, B, and CLR Input s for Slow Input Transition Rates D Ove rriding Clear Terminates Output Pulse D Glitch-Free Power-Up Reset on Outputs SN54LV221A . . . J OR W PACKAGE SN74LV 221A . . . D, DB, DGV, NS, OR PW PACKAG E (TOP VIEW) 1A 1B 1CLR 1Q 2Q 2Cext 2R ext/Cext GND 1 2 3 4 5 6 7 8 16 VCC 1 5 1Rext/Cext 14 1Cext 13 1Q 12 2Q 11 2C LR 10 2B 9 2A SN54LV221A, SN74LV221A D UAL MONOSTABLE MULTIVIBRATORS WITH SCHM ITTĆTRIGGER INPUTS SCLS450G − DECEMB ER 1999 − REVISED APRIL 2005 D Ioff S upports Partial-Power-Down Mode Operati on D Latch-Up Performance Exceeds 100 m A Per JESD 78, Class II D ESD Protectio n Exceeds JESD 22 − 2000-V Human-Body Model (A114-A) − 200-V Machine Model (A115-A) − 1000-V Charged-Device Mod el (C101) SN54LV221A . . . FK PACKAGE ( TOP VIEW) 1B 1A NC VCC 1R ext /C ext 1CLR 1Q NC 2Q 2Cext 3 2 1 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 1.
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